Thermal Separation Research Articles

Thermodynamic modeling of adsorption at the liquid-solid interface

Adsorptive separation techniques are significantly energy efficient in comparison to conventional thermal separation techniques such as distillation. Despite extensive research and development activities undertaken for mixed-gas adsorption, the use of adsorption techniques for the separation of multicomponent liquid mixtures is still limited. A major barrier is the lack of accurate adsorption thermodynamic models, which form the scientific foundation of process simulation of such systems, making the translation to industrial scale challenging. In this work, we have rigorously computed the surface excess of adsorption for six binary liquid mixtures on silica gel at 303 K using the frameworks of the generalized Langmuir isotherm (gL) and the adsorbed solution theory (AST). The six binary liquid mixtures were formed by the pair-wise combinations of four components: benzene, 1,2-dichloroethane, cyclohexane, and n-heptane. We have based our calculations by considering simultaneous equilibria of three phases: saturated vapor phase, bulk liquid phase, and adsorbed phase. The composition of the corresponding saturated vapor phase was estimated by the Nonrandom Two-Liquid activity coefficient model and experimental vapor-liquid equilibria data. The activity coefficients of the adsorbed phase, the central issue of multicomponent adsorption thermodynamics, were calculated using the adsorption Nonrandom Two-Liquid activity coefficient model. Devoid of simplifying assumptions, gL and AST provide rigorous thermodynamic frameworks for adsorption equilibria of multicomponent liquid mixtures.

Helical Packing Columns for Preventing Foam Formation: Experimental and Numerical Investigations

AbstractUnwanted foaming and liquid bridging inside structured packings have a negative effect on the pressure drop during thermal separation processes. A novel helical design of a packing column for preventing foaming is presented. The effective interfacial area is calculated by numerical simulations. Different designs are analyzed by varying geometrical parameters such as helix pitch, channel opening angle, and number of channels. Different F‐factor values and liquid loads are evaluated. Packings with larger helix pitch exhibited lower pressure drop and reduced effective interfacial area. Smaller channel opening angles increased the pressure drop and promoted unstable flow conditions. The novel packings show lower effective interfacial area than existing structured packings, but no foaming was observed in a wide range of operating conditions.

Separation of Aromatic Hydrocarbons in Porous Materials.

Industrial-scale thermal separation processes have contributed greatly to the rise in carbon dioxide emissions. Porous materials, such as metal-organic frameworks (MOFs), can potentially reduce these emissions by achieving nonthermal chemical separations through the physical adsorption of targeted species with high selectivity. Here, we report the synthesis of the channel-based MOFs NU-2000 and NU-2001, which are constructed from three-dimensional (3D) linkers, to separate the industrially relevant xylene isomers under ambient conditions by leveraging sub-Ångstrom differences in the sizes of each isomer. While the rotation of two-dimensional (2D) linkers in MOFs often affords changes in pore apertures and pore sizes that are substantial enough to hinder separation efficiency, increasing the linker dimensionality from 2D to three-dimensional (3D) enables precise control of the MOF pore size and aperture regardless of the linker orientation, establishing this design principle as a broadly applicable strategy.

Recovery of Ti-bearing blast furnace slag and diamond wire saw silicon powder waste by alloying and electromagnetic separation technique

Ti-bearing blast furnace slag (TBFS) and diamond wire saw silicon powder (DWSSP) waste are solid wastes that have been investigated by researchers. In this paper, the possibility of metal thermal reduction of TBFS is determined by calculating the component activities using the molecular interaction volume model (MIVM). The metal thermal reduction and electromagnetic separation technique was used to simultaneously recover titanium (Ti) and silicon (Si) from waste. DWSSP and Al were used as the reducing agents for the high-temperature reduction of TBFS in an induction furnace. The reduced Ti was alloyed with a small amount of Al and residual Si in DWSSP. The alloy and slag were separated by electromagnetic stirring because they were subjected to forces in opposite directions. The effects of CaF2 addition and holding time on the recovery rate of Ti were studied. It was found that the addition of CaF2 to the raw materials improved the separation of the alloy from the slag. Si and TiSi2 were the main phases in the recovered alloy. This simple process provides a new method to recover Ti and Si from TBFS and DWSSP.

Detecting flooding state in extraction columns: Convolutional neural networks vs. a white‐box approach for image‐based soft sensor development

Among thermal separation methods, solvent extraction with countercurrent flow is one of the most energy-efficient processes. The separation efficiency is highest close to the flooding point, which characterizes the maximum possible liquid throughput. However, this point is the limiting parameter in the entire extraction process since the flow of at least one phase is stopped. The optical supervision of the equipment enables the efficient operation of the extraction column near the flooding state. This contribution presents an assessment of two approaches in detecting the undesirable flooding state through recorded images of a transparent extraction column. One approach is a feature-based space that is more interpretable in extracting features than a Support Vector Machine classifier. The second is a feature-extraction pipeline followed by a robust Convolutional Neural Network model. The analysis regarding the inference times shows that both models can be used as online classification tools for real-time applications.

The dynamic model of a rectification heat exchanger using the concept of heat-integrated distillation column

A dynamic model of the apparatus used for thermal rectification of mixtures was developed, where in a channel-type exchanger the thermal separation of substances is accompanied by diaphragm heat exchange. In the description of the channel-type exchanger applied in heat-integrated distillation columns, a new approach in mathematical modelling was used combining the model of thermal resistance (in the description of the diaphragm heat exchange) and the theoretical tray model (in the description of the mass transfer). In the literature, it wasn't presented yet the influence of industrial constraints (grow up of deposits on the heat transfer surface or hold up of liquid inside the channel of exchanger) on the heat-integrated distillation column behaviour in the dynamic state. Thus, the authors carried out the numerical simulations for the proposed dynamic model subjected to industrial constraints. The transient characteristics, obtained from the simulations, show that the channel-type exchanger is dynamically stable under industrial constraints. Moreover, the dynamic model confirmed that the distillate purity isn't strongly sensitive on the above constraints (the distillate purity deteriorates approximately by 1%). What's more, the transient characteristics show that the commonly used a proportional–integral–derivative controller can be applied in proposed technology under industrial constraints.

Characteristics of Pavement Cement Concrete Incorporating Steel Slag Powder

After thermal braising and magnetic separation, steel slag is often ground into steel slag powder (SSP), which contains active silica (SiO2) and can be used as a cementitious material to replace part of the cement and applied in concrete. However, there have been relatively few studies on the influence of SSP on the performance of pavement cement concrete (PCC). In this paper, SSP was used as an admixture to replace part of the cement in the cement paste, cement mortar, and PCC, to investigate the effect of SSP on the fluidity of SSP-cement slurry, the mechanical properties, and the durability of PCC. Results showed that SSP can lead to the secondary hydration reaction with Ca(OH)2 in the cement paste and affect the hydration products, morphology, pore characteristics, and strength of the cement paste. When the SSP mixing amount was less than 20% and up to 1.3% superplasticizer was added, the fluidity of the cement slurry could be optimized. For the samples with the SSP mixing amount of less than 20%, the concrete compressive strengths were greater than 50 MPa, and the flexural strengths were greater than 5.0 MPa. As the SSP mixing amount increased, concrete displayed a better anticarbonization performance. Finally, using 15% SSP, the best performance in terms of the concrete antipermeability (chloride ion diffusion coefficient and electric flux) and frost resistance was achieved.

Synergistic effect of polyvinyl chloride and coal ash on thermal separation of heavy metals from MSWI fly ash through molten salt process.

Municipal solid waste incineration fly ash (FA) contains high contents of salts and high concentrations of heavy metals, which makes FA disposal extremely difficult. However, heavy metal elements could potentially be separated from FA during thermal treatment process to make it possible to be recycled. This work aims to study the volatilization of heavy metals in FA treated by molten salt method. The influence of polyvinyl chloride (PVC) and coal ash (CA) on volatilization of heavy metals was investigated. Within the scope of this study, the highest heavy metal removal rate can be under the condition: the calcium chloride/sodium chloride weight ratio 1:1, the FA/molten salt weight ratio 1:10, treatment temperature 1000°C for 2 hours in reducing atmosphere. The volatilization rates of lead, zinc, copper, chromium and manganese were 86.20, 67.53, 65.24, 50.07 and 39.45%, respectively. On the basis of molten salt treatment, adding PVC could promote the volatilization of heavy metals. The volatilization rate of lead was 96.71%, and the volatilization rates of chromium and manganese were higher than 60% when the content of PVC was 5 wt%. When adding 10 wt% CA and 1 wt% polyvinyl chloride, the volatilization rate of lead could reach 100%. The experiments and thermodynamic calculations showed that silicon dioxide and aluminium oxide in CA and hydrochloric acid decomposed from PVC could promote the chlorination and volatilization of heavy metals. The volatilized heavy metal chlorides provided the possibility of recovery and utilization of heavy metals in FA.

Impact of temperature approach on the behavior of the rectification heat and mass exchanger under fouling constraints

In industrial applications, thermal separation of substances is carried out in rectification and distillation columns and each one of them is equipped with condenser and reboiler. Such technology is energy-consuming, i.e. it requires high heat supply to the reboiler, and significant waste heat discharge through the condenser, to the environment. The new approach assumes thermal separation carried out in a system of channels where heat distribution is sustained through a diaphragm, i.e. channel walls and the number of reboilers and condensers is reduced to minimum. This type of apparatus serves for heat transfer and simultaneous thermal separation of substances, thus mathematical model of rectification heat and mass exchanger (HME) exercises the concept of heat-integrated distillation column (HIDiC) in a channel-type geometry. As it has been shown in previous studies, such technology has a potential of reducing energy consumption by 40%–60% compared to rectification columns currently used in industry. The model of the channel-type exchanger uses a theoretical tray model for describing mass transfer, combined with our in-house mathematical description of diaphragm heat transfer that takes fouling resistance into account.Numerical calculations carried out in this work were focused specifically on the impact of fouling on the operation of channel-type heat and mass exchanger. Key issues covered in this work included the impact of fouling on the purity of collected fractions (which have to meet guidelines given by process designer) and the intensity of internal heat streams (which are decisive for energy-saving). In the parametric study, the minimum temperature difference between mixture streams in the stripping and rectifying sections was also included.The simulation results showed that for considered mixture of fractions, assuming a realistic range of fouling thermal resistances, the sensitivity of channel-based heat and mass exchanger to fouling is negligible, and the purity of distillate is hardly affected.

Multi-index probabilistic anomaly detection for large span bridges using Bayesian estimation and evidential reasoning

To measure uncertainties within anomaly detection and distinguish sensor faults from anomalous events, a multi-index probabilistic anomaly detection approach is proposed for large span bridges based on Bayesian estimation and evidential reasoning. To avoid false detection raised by signal spikes, an energy index is first defined and extracted from pre-processed measurements, including missing data recovery and thermal response separation. Then, a probabilistic index, namely, certainty degree, is derived from probability density functions of detection triggers – extreme values predicted by using Bayesian estimation of the generalized Pareto distribution. To distinguish sensor faults from anomalous scenarios, evidential reasoning is applied to incorporate multiple certainty degrees into a joint one under the assumption that the probability of multi-sensor failing simultaneously is extremely low. Specifically, a large joint certainty degree indicates a high occurrence probability of anomalous scenarios, while a small one together with a large individual certainty degree depicts a high probability of sensor faults. Finally, the effectiveness of the proposed anomaly detection method is validated through structural health monitoring data from the Nanjing Dashengguan Yangtze River Bridge. Measurements from four sensors, that is, three cable forces and one deflection, are selected to detect anomalies based on their high pair-wise correlations. Two case studies are presented, namely, sensor fault detection and snow disaster detection. The sensor fault is detected through a certainty degree of almost 100% for the individual index and a joint certainty degree of nearly 0. The snowstorm is detected by a joint certainty degree of 36.82%.

Design, fabrication, and evaluation of produced water treatment system for effective removal of oil and salt

Inappropriate disposal of Produced Water is one of the causes of degradation of the environment in the Niger-Delta. The effect on farmlands and aquatic life has been disastrous and this disposal continues because of lack of treatment equipment or inability to maintain treatment equipment. This work has developed a method for produced water treatment focusing on oil and salt removal. A small scale produced water treatment system was fabricated. The system’s processes were based on thermal energy; thermal phase separation was used for oil removal and humidification-dehumidification was used for salt removal. The water obtained at the various process stages was tested to ascertain the oil content and salinity. Results obtained showed that oil levels in the produced water dropped from 3034.28mg/l to 380.58mg/ after phase separation which is significant but not meeting the Department of Petroleum Resources (DPR) requirement. However, after the humidification – dehumidification process, it was reduced to 4.02mg/l which meets the DPR requirement of 10mg/l. The salinity also reduced from 887.50mg/l to 35mg/l, this meets DPR acceptable limits for land disposal of 600mg/l.

Experimental investigation of aluminum nitride/carbon fiber‐modified composite phase change materials for battery thermal management

The phase change material is currently being regarded as an effective cooling media to be applied in the thermal management of lithium batteries-powered vehicles, in which the inorganic hydrate phase change material is desirable and widely investigated due to the high thermal conductivity, latent heat value, and low cost. However, when applied to thermal energy storage applications, supercooling and phase separation are problematic. To effectively circumvent this issue, this work considers utilizing the disodium hydrogen phosphate dodecahydrate as the matrix of the composite phase change material, as the phase transition temperature is suitable for the battery's operating temperature range. Meanwhile, the nucleating agent sodium metasilicate nonahydrate with similar lattice parameters and the thickener carboxymethyl cellulose are used to suppress the supercooling and eliminate the phase separation, respectively. Effects of nucleating agent, surface modified aluminum nitride, and short-cut carbon fiber on the supercooling degree, and thermal conductivity and curing performance in the phase change material are evaluated and discussed in detail to determine the optimal preparation scheme for Na2HPO4·12H2O/modified AlN/CF inorganic composite phase change materials. Experimental results show that the addition of 4 wt% Na2SiO3·9H2O, 4 wt% CMC, 12 wt% modified AlN, and 6 wt% CF reduces the supercooling degree of the composite phase change material to 1.9°C and increases the thermal conductivity to 1.86 W/(m·K). The composite phase change material is found to have a suitable phase change temperature (35°C), high latent heat (249 J/g), excellent shaping effect, and electrical safety performance. In addition, the composite phase change material battery module can effectively control the battery's temperature, with the maximum temperature reduced by 40.9°C at 3C discharge rate and 30°C ambient temperature compared with the natural cooling battery module. The maximum temperature difference of the composite phase change material battery module is shown to be reduced to the minimum value of 0.9°C. Highlights A novel disodium hydrogen phosphate dodecahydrate—modified aluminum nitride—carbon fiber composite phase change material is designed and prepared for battery thermal management systems. The antiwater modification scheme of AlN is proposed and assessed. The effects of AlN before and after modification on the thermal properties of CPCM are compared. The joint use of nucleating agent sodium metasilicate nonahydrate and thermal conductive filler AlN contributes to significantly inhibiting the supercooling of hydrate salt. The addition of CF can effectively increase the thermal conductivity of CPCM and prevent its leakage. CPCM has suitable phase change temperature, high thermal conductivity and latent heat value, excellent electrical safety, and stable curing performance. The battery test bench is constructed and the discharge test of the CPCM battery module is carried out. The results show that the CPCM battery module has excellent cooling performance and temperature uniformity.

Experimental comparison on condensation and evaporation outside double-side enhanced horizontal tubes

Experimental investigations of the condensation and evaporation of R410A on the outside of two double-side enhanced heat transfer tubes were conducted, and the tube performance was compared with that of a smooth copper tube. The research object consisted of a smooth tube with a length of 2000 mm and an outer diameter of 25.4 mm and two double-side enhanced tubes of the same size. The evaporation experiments were run under the following conditions: the evaporation saturation temperature was 7°C, water inlet temperature was 8°C–18°C, and water flow rate was 0.6–1.6 m3/h. The condensation experiments were run under the following conditions: the saturation temperature was 35°C, water inlet temperature was 21°C–30°C, and water flow rate was 0.4–1.6 m3/h. During the data processing, the heat transfer coefficient of the water side was obtained using the Gnielinski-Wilson method, and that of the refrigerant side was obtained using the thermal resistance separation method. The effect of the surface structure on the heat transfer performance was analyzed, and a strengthening measure was proposed. The experimental results indicate that the evaporation heat transfer coefficients outside the smooth tube increased with the raise of the inlet water temperature, while the double-side enhanced tubes decreased; both the condensation heat transfer coefficients outside the smooth tube and the enhanced tubes increased with the increase of the water flow rate. Due to the different type of enhanced tube ribs, tube #3 surface structure is more conducive to the formation of vaporization core, which is about 30% higher than the outer heat transfer coefficient of tube #2. It is more in line with the requirements of strengthening horizontal single tube external pool boiling heat transfer. In the condensation experiment, the condensation heat transfer coefficients outside the smooth tube increased with the raise of the inlet water temperature, while the double enhanced tubes decreased; both the condensation heat transfer coefficients outside the smooth tube and the enhanced tubes increased with the increase of the water flow rate. With the analysis of the rib structure, the outer surface structure of tube #2 has stronger drainage capacity, and the external average condensation heat transfer coefficient is about 7% higher than that of tube #3, which is more in line with the requirements of condensing heat transfer outside the single tube.

Transient thermal pattern separation and detection of conductive defects in composite insulators using eddy current pulsed thermography

Composite insulators are prone to internal conductive defects owing to their long-term high-voltage operation and outdoor aging. In this study, a method based on eddy current pulsed thermography (ECPT) combined with feature extraction transform algorithms is proposed for transient thermal pattern separation and defect detection in composite insulators with internal conductive defects. The principles of this method, including electromagnetic heating, thermal diffusion, and transient thermal response extraction, are investigated. Conductive defects in insulators have unique thermal patterns that differ from those of non-conductive defects in conductive materials. In this study, the original transient thermal responses of conductive defects are analyzed and compared with those of non-conductive defects. The effectiveness of the transient thermal pattern separation of this method is verified through experimental studies. Different feature extraction transform methods are utilized and compared to separate different thermal transient patterns and perform quantitative evaluations. It is found that ECPT combined with feature extraction transform algorithms can provide a visual and effective method to detect internal conductive defects in composite insulators.

Improved multilevel storage capacity in Ge2Sb2Te5-based phase-change memory using a high-aspect-ratio lateral structure

Further improvement of storage density is a key challenge for the application of phase-change memory (PCM) in storage-class memory. However, for PCM, storage density improvements include feature size scaling down and multi-level cell (MLC) operation, potentially causing thermal crosstalk issues and phase separation issues, respectively. To address these challenges, we propose a high-aspect-ratio (25:1) lateral nanowire (NW) PCM device with conventional chalcogenide Ge2Sb2Te5 (GST-225) to realize stable MLC operations, i.e., low intra- and inter-cell variability and low resistance drift (coefficient = 0.009). The improved MLC performance is attributed to the high aspect ratio, which enables precise control of the amorphous region because of sidewall confinement, as confirmed by transmission electron microscopy analysis. In summary, the NW devices provide guidance for the design of future high-aspect-ratio three-dimensional PCM devices with MLC capability.

Fabrication of a cost-effective cation exchange membrane for advanced energy storage in a decoupled alkaline-neutral electrolyte system

Herein, a cost-effective cation exchange membrane (CEM), sulfonated polyether ether ketone membrane (SPEEK-M), is prepared through heat sulfuric acid treatment followed by evaporation induced thermal phase separation. Negative charged sulfonic acid functional groups can be grafted on the polymer chains during this process. Exchange of cations, and repulsion of anions are hence realized using this membrane. To further improve the performance of the SPEEK-M, SiO2 is introduced in. It is found that ionic conductivity is increased to 46.79 mS·cm−1 for the SiO2-SPEEK-M from 19.17 mS·cm−1 for the SPEEK-M. Compared with commercial CEMs, such as DuPont N117 and Huamotech, volume expansion of the SPEEK-M is rather small after immersed in water. The membranes are then used as separators in Zn-ion hybrid capacitors (ZIHCs) with decoupled aqueous electrolytes, which includes a Zn foil anode in an alkaline electrolyte, and an activated carbon (AC) cathode in a neutral electrolyte. The electrolyte decoupling strategy maximizes the operating window of this system to 0.5 ∼ 2.2 V. The specific capacity of the AC can reach 390.0C·g−1 at a current density of 0.5 A·g−1. An energy density of 46.2 Wh·kg−1 at a power density of 3416.1 W·kg−1 can be achieved (counting the weight of AC). After gelation of the electrolytes, the growth of Zn dendrite is successfully eliminated, and capacity retention along cycling is increased to 94.3 % using the SiO2-SPEEK-M, which is better than that using the commercial DuPont N117 and Huamotech. The raw materials used here to prepare the CEMs are cheap and eco-friendly, which makes the membranes promising candidates as separators for decoupled electrolyte systems.

HDM, interfacing thermal analysis and ambient ionisation mass spectrometry

Thermomicroscopy (aka hot-stage microscopy) has been shown to be an excellent complimentary tool when used in conjunction with other analytical techniques, such as DSC and TGA. The optical data obtained from thermomicroscopy aid in the elucidation of complex events, often seen in many thermoanalytical profiles. Here, a system linking hot-stage microscopy and direct analysis in real-time mass spectrometry is described. This combination allows the simultaneous detection of both physical and chemical properties of a material as it is heated. Results showcasing the benefits of this combination include the thermal separation of energetic materials, the analysis of 3D printer filaments, and the profiling of trace materials including paint chips and fibres.

Direct Inlet Py-GC-MS analysis of cultural heritage materials

Pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) is an invaluable tool in the analysis of cultural heritage materials, particularly those containing complex polymerised components, whether natural or synthetic in origin. As the field embraces non-destructive and micro-sampling analysis, it is not always possible to perform traditional flash Py-GC-MS due to the sample size requirements of the technique, which are typically in the range of 50–100 µg. The development of a pyrolysis method using a Thermal Separation Probe (Agilent Technologies Inc.) has allowed for splitless Py-GC-MS analysis to be carried out on much smaller samples. This technique makes use of a multi-mode inlet that is capable of rapidly heating to 450 °C. Because pyrolysis takes place within the inlet, the methodology has been designated Direct Inlet Pyrolysis (DIP). Examples of synthetic reference materials, as well as case studies of archaeological residues and a varnish from the 1960 s were employed to demonstrate this adapted analytical technique. The results obtained using DIP-GC-MS were compared to published thermal degradation data and higher-temperature flash Py-GC-MS chromatograms. The results indicate that DIP-GC-MS can characterise the organic fraction of complex polymeric samples. Differences in pyrolysate formation and relative abundance occur for some polymers which are caused by lower and prolonged pyrolysis conditions. The technique can be performed in splitless mode with just a few micrograms of precious sample from cultural heritage objects, or by employing a low split if desired for more abundant reference materials. Like other Py-GC-MS methods, the on-line use of a reagent such as tetramethylammonium hydroxide (TMAH) allows for the derivatisation of polar functional groups.

Study of green surface-enhanced Raman spectroscopy determination of methanol in alcoholic beverages

There are two main challenges in completing surface-enhanced Raman spectroscopy (SERS) detection. One is the small Raman scattering cross-section of methanol, and the other is the derivatization strategy. They were solved by coupling the catalytic strategy with a thermal purge separation and enrichment device. In this study, quantitative analysis of methanol in alcoholic beverages was performed as methanol was catalyzed to formaldehyde. For detecting methanol in low-alcohol beverages, the acetaldehyde derivatives generated by the interaction of ethanol-catalyzed oxide acetaldehyde with 3-methyl 2-benzothiazolinone hydrazone hydrochloride hydrate (MBTH) during the catalytic process will not cause large interference with the SERS signal of formaldehyde. In this case, MBTH with higher sensitivity is selected for the derivatization operation. In the analysis of methanol in high-alcohol beverages, acetylacetonate derivatization without interaction with acetaldehyde was used to avoid the interference of the acetaldehyde generated from ethanol. Based on the detection of formaldehyde in methanol standard solutions, methanol was detected in wine and sake as well as in high-alcohol beverages. Thus, a convenient and rapid method was achieved for the detection of methanol in alcoholic beverages.

Preparation and properties of polysiloxane modified fluorine-containing waterborne polyurethane emulsion

A series of polysiloxane modified fluorinated waterborne polyurethane emulsions (H-SiFPU) were prepared by using hydroxypropyl polydimethylsiloxane (HP-PDMS) and polytetramethylene ether diol (PTMG) as soft segments, isophorone diisocyanate (IPDI), dihydroxymethyl butyric acid (DMBA), 2,2,3,3,4,4,5,5-octafluoro-1-pentanoloctafluoropentol (OFP) and ethylenediamine (EDA) as hard segments. The structure and properties of the emulsion were characterized by FT-IR, TG, SEM, XPS, XRD, water absorption and contact angle. The results show that with the increase of the dosage of HP-PDMS, the particle size trends to firstly increase and then decrease, and the transmittance of the emulsion gradually decreases. Moreover, the addition of HP-PDMS increases the thermal stability and phase separation of the film and reduces the crystallization property. The fluorine and silicon elements are enriched on the surface of the film, the water contact angle increases from 71.2°to 105.95°, and the water absorption decreases from 20.3% to 11.1%, which contributes to the water resistance of the film. Therefore, it is concluded that with the addition of 15 wt% HP-PDMS, the tensile strength and tear strength of coated leather are 935N and 130N, respectively. Meanwhile, the coated leather has excellent hydrophobicity, good aging resistance and mechanical properties.