Alkyl Polyglucoside Research Articles

The impact of alkyl polyglycoside surfactant on oil yields and its potential effect on the biogenic souring during enhanced oil recovery (EOR)

The aim of this work is to quantify the effect of using alkyl polyglycoside (APG) surfactant as the main agent for oil recovery and to quantify its potential impact on biogenic souring. Sand-pack column replicates were subjected to two surfactant concentration injection events both in the presence and absence of oil. The activity of sulphate-reducing bacteria (SRB) was tested using the distinct resultant produced waters (PWs) or with surfactant solutions as the additional carbon source. The results suggested that a surfactant concentration of 2% (w/v) can recover 7.7 fold more oil than 0.1% (w/v). The PWs SRB-activity testing identified that surfactant concentrations below 1% (w/v) can significatively increase microbial activity (256μgSO4/L/h) - which enhances biogenic souring. PWs with higher surfactant concentrations inhibited SRB-activity in the presence of oil. SRB-microbes can utilize surfactant as the sole carbon source (concentrations below 2% w/v). Thus, the mixture of surfactant and oil increased or decreased SRB-activity depending on their concentration (low/high, respectively). Surfactant can not only assist in enhancing biogenic souring but, at a higher concentration, may control it without the need of employing significant amounts of biocide.

Polysaccharide-stabilized oil-laden foam for enhancing oil recovery

Understanding the influence of crude oil on foam stability is critical to investigations of improved foam-EOR process. With enough physical actions, the oil phase can pour into and be trapped in the aqueous network, enfolding the gas bubbles with a honeycombed structure, which forms an extraordinary ternary system also known as oil-laden foam (see Fig.1). The goal of this study is to investigate the synergistic effects of using a blend of xanthan gum (XG) and alkyl polyglycoside (APG) on the stability of oil-laden foam, and a series of experiments are developed. The results indicate that the addition of XG in the oil-laden foam can boost the performance including both emulsification and pseudoemulsion film aspects. One way is to reduce the liquid drainage or hinder the movement of oil droplets within liquid films by increasing the emulsion stability and liquid viscosity. Another is to decrease the rupture of tri-phase foam by creating the high-stable pseudoemulsion film with a dense and elastic adsorption layer. Under the synergistic effect of these two mechanisms, the dynamic stability of liquid films can be improved, bubble coarsening and gas diffusion can be hindered, and finally the stability of the oil-laden foam can be greatly increased. The stable oil-laden foam (i.e., the oil-continuous films) is created during the XG/APG foam injection, which is in favor of mobility control and oil displacement.

Characterization and authentication of commercial cleaning products formulated with biobased surfactants by stable carbon isotope ratio

This study focuses on the application of stable carbon isotope analysis to determine the origin of commercial surfactants and cleaning products, especially used in quality process by chemical companies. The δ13C value was applied to commercial surfactants, such as ethoxylate alcohol, sodium lauryl sulfate, alkyl polyglucoside with different origin, that are the most common raw materials used in cleaning products. In this study, the isotopic analysis was performed on mixtures of commercial surfactants to simulate the commercial detergent formulations (handwashing, multisurface cleaner and degreaser) and then on bulk professional cleaning products to match relationship between isotope carbon composition and concentration of surfactants in real samples. This study demonstrated that δ13C was correlated to the origin of surfactants. In particular we analyzed five samples of biobased surfactants, with δ13C value from −22,6‰ to −28,0‰, and six samples from carbon fossil raw material, with δ13C value from −28,5‰ to −32,0‰, which were the most common raw material used in commercial cleaning products. Isotope carbon composition was also applied on mixtures of biobased and fossil surfactants to simulate and perform the method for stable carbon isotope analysis of commercial cleaning products. Furthemore the results assessed the relationship between stable carbon isotope ratio values and surfactant concentration in mixtures: for example in 50% mixtures of biobased (δ13C −22,6‰) and synthetic surfactant (δ13C −32,5‰), we found a δ13C value −28,00‰. The main advantage in using δ13C analysis is related to cheapness and easy-to-operate method in comparison to radiocarbon methodology.

Preparation and characterization of poly(3-hydroxybutyrate-co-4-hydroxybutyrate)/pullulan-gelatin electrospun nanofibers with shell-core structure

In this study, hydrophilic pullulan, which is favorable for cell adhesion, proliferation, and differentiation, was selected as a modifier for the preparation of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P(3HB-co-4HB))/pullulan nanofibers via electrospinning to improve the biocompatibility of P(3HB-co-4HB) and increase the drug loading of composite fibers. Alkyl polyglycoside was used as the emulsifying agent to promote emulsification and stabilize the P(3HB-co-4HB)/pullulan composite solution. Drug-loading property of the nanofibers with a shell-core structure is increased because gelatin was not formed into fibers via electrospinning, thereby forming a stable drug-containing gelatin solution in the core layer. Finally, P(3HB-co-4HB)/pullulan-gelatin shell-core nanofibers were prepared. The intermolecular interaction, morphology, crystallization properties, mechanical properties, morphology, sustained release, and biocompatibility of composite nanofibers were characterized. Results show that the crystallization property of P(3HB-co-4HB)/pullulan composite nanofibers increases continuously with an increase in the pullulan content. As the pullulan content increases, the strain and stress of P(3HB-co-4HB)/pullulan nanofibers increase initially and decrease later. At the mass ratio of P(3HB-co-4HB) to pullulan of 10:2, P(3HB-co-4HB)/pullulan composite nanofibers exhibit a uniform morphology with an average diameter of 590 nm and porosity of 70.71%. At this mass ratio, the P(3HB-co-4HB)/pullulan-gelatin/drug shell-core structure, which sustained a release effect for more than 180 h, has potential applications as biomaterials without cytotoxicity.

Concentration-dependent physicochemical behaviors and micellar interactions in polyalkoxylated fatty alcohol-based binary surfactant systems

The concentration-dependent physicochemical behaviors of the binary mixtures of polyalkoxylated fatty alcohol (PAFA)-AS (alkyl sulfonate), PAFA-CB (cocamidopropyl betaine) and PAFA-APG (alkyl polyglucosides) and their micellar interactions were determined at the ratios of 9:1, 8:2, 7:3 and 6:4 (w/w). At concentrated level, the rheological study of all the PAFA-mixed surfactants display a Newtonian behavior at low viscosities. Prominent discrepancies among the mixed surfactant systems were observed after stepwise dilution of the samples. In tensiometry study, the types of mutual interaction in the mixed surfactant systems were evaluated by regular solution theory (RST). The CMCexp curves of PAFA-AS and PAFA-CB systems demonstrate lower position than their CMCtheo curves signifying that these nonionic–anionic and nonionic–zwitterionic samples behave nonideal showing synergistic interaction between individual components in the mixed micelles, as further verified by the negative values of interaction parameter β and activity coefficients f1 and f2 are less than 1. Meanwhile, the PAFA-APG system shows no significant mutual interaction between the nonionic–nonionic components in the mixed micelles. TEM micrographs depict the formations of branched wormlike micelles and multiconnected threadlike networks for the PAFA-AS and PAFA-CB systems, respectively, while gigantic multilamellar vesicles for the PAFA-APG system. Upon dilution of these mixed surfactants to CMC, the mixed micelles are in monodisperse sizes of less than 15 nm and in various magnitudes of zeta potential ranging from –2.92 to –21.87 mV.

Development of biobased waterborne coatings containing Ecomer®: An alkyl polyglucoside maleic acid ester monomer

Partially biodegradable waterborne coatings with bio-contents ranging from 30 % to 65% have been developed using Ecomer®, an alkyl polyglucoside maleic acid ester functional comonomer, by seeded semibatch emulsion polymerization. The composition of the commercial monomer was characterized and its copolymerization was carried out analyzing its incorporation degree. Thereafter, waterborne coating systems containing 2-Octyl acrylate and isobornyl methacrylate as main comonomers were developed and fully analyzed. The caramelization process allowed to incorporate the free Ecomer® content as well as to improve both mechanical and coating properties. IR, TGA and DMTA analysis shed light about this process and its correlation with the final properties. The incorporation of sugar moieties resulted in partial biodegradability of the coatings films, being less biodegradable the caramelized ones.

Evaluation of the Effect of Nonionic Surfactants and TBAC on Surface Tension of CO2 Gas Hydrate

Given that most of the gaseous constituents of industrial chimneys are usually carbon dioxide which is one of the most important greenhouse gases. It seems that the hydration process is one of the newest methods for the separation of this gas from gaseous mixtures. In the gas hydrate formation industry, in addition to disadvantages, there are some advantages such as gas separation, transmission, and storage. Therefore, it is important to determine the appropriate promoter for the formation of gaseous hydrates as well as to find the inhibitor. In this study, the effect of tetra-n-butyl ammonium chloride (TBAC) (which is a thermodynamics promoter) and alkyl poly glucoside (APG) as a nonionic surfactant on the surface tension of carbon dioxide hydrate formation process have been studied. The experiments were carried out in a 218 cm3 batch reactor. The surface tension of CO2 hydrate has been determined at different concentrations and different temperatures and pressures. The nucleation classical theory has been used for this purpose. Designing the experiments performed by Design-Expert software. The results show that increasing the APG and temperature leads to decreasing the surface tension and in contrast, induction time decreases, and the experimental model of the effect of these parameters on surface tension presented as R2 = 0.9898.

Anti-inflammatory and wound healing potential of a clove oil emulsion

Emulsion formulations of essential oils are of major interest due to their relative biosafety, biocompatibility and good pharmacological potential. Their structural constituents (oil and water phase) facilitate ready solubilization of incorporated hydrophilic/lipophilic actives for their targeted delivery. In the present study, m5S cells were tested for their viability at various concentrations of clove oil and an alkyl polyglucoside emulsifier, viz., Montanov 202™. Thereafter, good cell viable concentrations of oil (10 %) and emulsifier (4%) were used at their optimised ratio (1:0.4) to formulate an oil in water emulsion using phase inversion technique followed by ultrasonication for particle size reduction. Gas chromatography-mass spectrometry (GC–MS) analysis of clove oil revealed eugenol (76.11 %) and eugenyl acetate (12.41 %) as major constituents. The formulated clove oil emulsion was then characterised with respect to its size, zeta potential, microscopic and thermal analysis and the presence of liquid crystals were observed in the same. It was further studied for its anti-inflammatory potential in female Wistar rats wherein topical treatment with the emulsion inhibited paw swelling induced by carrageenan model by 40−60% over 30−180 min compared to untreated animals. Similarly, the emulsion’s wound healing potential was also significant with respect to wounds induced by both incision (wound breaking strength of 338.91 ± 5.02 g) and excision (95 % wound contraction by 16th day) model in these animals, with a re-epithelization period of 10.67 ± 1.67 days and results being comparable with diclofenac gel and neomycin cream (positive controls). Histopathology of the skin sections showed accelerated healing with early granular tissue and collagen formation in emulsion treated animals. It is hence envisaged that this clove oil emulsion can substitute chemical based topical products for anti-inflammatory and wound healing applications due to its biological constituents as well as because of the presence of liquid crystals in its formulation.

Sugar Surfactant‐Based Shampoos

AbstractNaturally derived surfactants in hair care products are a trend in cosmetic technology. This study aimed to formulate and fully characterize the performance of shampoos with sugar‐derived surfactants, namely, the alkyl polyglucosides decyl glucoside and coco‐glucoside. In addition, different thickeners and conditioning ingredients were added to improve the formulation properties. A sodium laureth sulfate (SLES) formulation was used as control. Rheology, pH, foaming, contact angles on a keratin surface, and surface tensions were determined. The safety of the formulations was evaluated by in vitro cytotoxicity studies using the human keratinocyte HaCaT cell line and human retinal pigment epithelial cells ARPE‐19. The efficacies were studied by in vitro hair combing force assays and in vivo sensorial analysis. The formulated sugar surfactant‐based shampoos showed the following properties: (i) pH values higher than those of SLES (which were posteriorly lowered with lactic acid); (ii) higher foamability than SLES, and high wettability; (iii) Newtonian behavior and predominance of liquid state with a suitable viscosity; (iv) low cytotoxicity in both human keratinocytes and retinal cell lines (in contrast to SLES); (v) easier hair combing than SLES, when Polyquaternium‐7 was used as conditioner; (vi) efficient and gentle hair washing; and (vii) favorable sensorial analysis confirming the previous washing properties. In conclusion, the sugar surfactants had a considerable impact in the properties of the shampoo formulations, in terms of both hair cleansing properties and efficacy, as demonstrated here. These favorable outcomes clearly support the use of these ingredients in shampoo formulation design.

FORMULATION AND EVALUATION OF LIQUID CRYSTAL EMULSION CONTAINING EXTRA VIRGIN OLIVE OIL AS SKIN ANTI-AGING

Objective: The purpose of this research was to formulate and evaluate the and anti-aging activity and the characteristic of liquid crystal emulsion of extra virgin olive oil (EVOO).
 Methods: Preparation of liquid crystal emulsion was made using the variation of alkyl polyglycoside and caprylic triglyceride as surfactant with concentration ratio was 3:5 (F1), 4:4 (F2), 5:3 (F3) and 5% extra virgin olive oil as an anti-aging substance. The liquid crystal emulsions were evaluated for an organoleptic test, microscopic, pH value, viscosity, particle size, zeta potential during 12 w storage at room temperature and centrifugation test. The selected liquid crystal emulsion was examined with anti-aging activity (moisture, pore, spot, and wrinkle) using a skin analyzer to volunteer’s skin.
 Results: The result showed that all formulas had stable storage for 12 w at room temperature (25±1 °C). Liquid crystal emulsion with a surfactant concentration of alkyl polyglycosides and caprylic triglycerides 4:4 (F2) showed the presence of liquid crystal, the stable value of pH (6.9) and viscosity (4995 mPa), smallest particle size 5.727 µm, and highest zeta potential-34.5 mV after 12 w storage at room temperature.
 Conclusion: EVOO liquid crystal emulsion (F2) showed better skin anti-aging activity (condition of moisture content, pore, spot, and wrinkle) than conventional emulsion. It concluded that the formula was stable physically and showed better skin anti-aging activity than conventional emulsion.

High internal phase emulsions stabilized with carboxymethylated lignin for encapsulation and protection of environmental sensitive natural extract

Oil-in-water (O/W) high internal phase emulsions (HIPEs) are widely used in foods, pharmaceuticals and cosmetics due to the high drug loading ratio, specific rheological behaviors and long shelf life. However, protective performance of active components within HIPEs maintains a low level. Herein, a series of carboxymethylated enzymatic hydrolysis lignin (EHL-CM-x) were synthesized by nucleophilic substitution and applied as macromolecular surfactant to stabilize the O/W HIPEs. It was found that EHL-CM-x combined with a small dosage of alkyl polyglycoside (APG) are able to stabilize HIPEs with 87 vol% soybean oil under neutral condition, which could be recognized as the highest internal phase reported in foods and pharmaceuticals. As a bioactive compound carrier, such EHL-CM-x stabilized HIPEs enable to provide outstanding UV, thermal and oxidation protection for sensitive natural extracts. The residual drug level obtained in this work is more than two times other gliadin/chitosan hybrid particles and sulfomethylated lignin stabilized HIPEs after UV irradiation. In vitro experiments showed that the minimum inhibitory concentration of curcumin within HIPEs against S. aureus and E. coli was 3.13 mg/mL and 12.5 mg/mL, respectively. Such lignin stabilized HIPEs could be potentially used in various areas, especially those with high stability and biosafety requirements.

Ultra-low interfacial tension biobased and catanionic surfactants for low permeability reservoirs

Abstract Alkyl polyglucoside, an eco-friendly, stable and low-cost available biobased surfactant, was chemically modified to develop ultra-low interfacial tension (IFT) surfactants for crude oil recovery from low permeability reservoirs. The modified anionic surfactant alkyl polyglucoside sodium hydroxypropyl sulfonate (APGSHS) was structurally characterized by FT-IR, 1H NMR and TGA methods. Following that, the cationic surfactant cetyl trimethyl ammonium bromide (CTAB) was combined with APGSHS to formulate the ultra-low oil/water IFT catanionic surfactants, which exhibits higher water-solubility than DTAB/APGSHS mixtures at various concentrations and combined ratios. Furthermore, the surface properties, thermodynamic parameters of the sole and combined surfactants show that the combined APGSHS/CTAB catanionic surfactants have lower surface tension (22.90 mN/m) at cmc, smaller area occupied per molecule and stronger micellization capacity, which indicates that the surfactant molecules are tightly absorbed onto the two-phase interface for catanionic surfactants. The mechanism underlying the strong electrostatic attraction between the ion head groups in APGSHS and CTAB could be proven by the high absolute value of interaction parameters (12.23) in binary systems. Besides, the salinity resistance effect tests indicate that the ultra-low IFT formula exhibits excellent performance in both monovalent and divalent ions conditions. Notably, the APGSHS/CTAB surfactants with total concentration of 3000 mg/L and molar ratio of 6:4 can effectively enhance oil recovery and decrease the injected pressure for low permeability reservoirs. Hence, the newly formulated green catanionic surfactants exhibit remarkable abilities for maintaining the ultra-low IFTs and can be used for EOR in low permeability and high salinity reservoirs.

A BRIEF REVIEW OF MICELLAR ENHANCED ULTRAFILTRATION (MEUF) TECHNIQUES FOR TREATMENT OF WASTEWATER IN INDIA

In this paper, we have reviewed the application and efficiency of Miceller Enhanced Ultrafiltration (MEUF) method which is used to remove Heavy Metals, Dyes, Polyaromatic Hydrocarbons (PAH), Novel Compounds, Chromium, Phosphorous and Phenolic Compounds. It uses various surfactants like Hexadecylpyridinium chloride (CPC), Sodium Dodecyl Sulphate (SDS), Hexadecyltrimethyl Ammonium Bromide (CTAB), Oxyethylated Methyl Dodecanoate (OMD) and Alkylpolyglucoside (APG). These surfactants are retained after the process to be reused. Bisorption, Coagulation, polyelectrolyte enhanced ultrafiltration, Reserve Osmosis, Nanofitration are some of the methods that are used for the treatment of wastewater. Available research focused on the removal of metals, phenol, organic & inorganic materials, aromatic hydrocarbons by MEUF mainly on the type of surfactant used, surfactant concentration, applied pressure, operating time and pH. Formation of surfactant micelle and mechanisms for the attraction between micelle and metal ions are ignored during the research study on MEUF. It has been reported that MEUF combines the efficacy and simplicity of the conventional options with the operational flexibility of membrane-based separation. MEUF could be used for removal of wastewater provided the pollutants have low molecular weight. Higher reagent and electrical costs are reported in conventional MEUF method as compared to the hybrid process with MEUF. The hybrid process requires fewer surfactants. MEUF is considered a better alternative to the typically available membrane separation processes. The advantages of this method over other methods are high removal efficiency, low energy consumption, and easy operation. The selection of surfactant for the removal purpose is based on the target pollutants.

Partitioning behaviour of novel surfactant mixture for high reservoir temperature and high salinity conditions

Investigating the use of surfactants in high temperature and high salinity conditions can assist expanding the application of surfactant-based enhanced oil recovery (EOR) to more challenging environments. In the present work, compatibility and thermal stability for alkyl ether carboxylate (AEC) and alkylpolyglucoside (APG) were investigated at anaerobic conditions. The most suitable surfactant formulation was selected after passing the screening criteria of compatibility and thermal stability for the studied offshore field. Interfacial tension (IFT) and partitioning of the selected surfactant formulation were then studied at different surfactant concentrations, brine/oil ratios, temperatures, and salinities. The partitioning behaviour of the AEC:APG mixture was comprehensively examined under the before mentioned conditions. The screening experiments for the individual surfactant AEC have shown poor compatibility and thermal stability. Whereas, a 50:50 ratio of the anionic-nonionic (AEC:APG) mixture has passed the compatibility test criteria. For 90 days, the mixture demonstrated remarkable compatibility and thermal stability at high water salinity (32k ppm) and high temperature (106 °C). The IFT of the AEC:APG mixture was significantly affected by the increase of surfactant concentration, temperature and salinity. The proposed mechanism, through the experimental results, illustrated that as surfactant mixture concentration gradually increased, additional molecules of AEC occupied the interface whereas the APG molecules tend to attach to the existed APG molecules at the interface via hydrogen bonds and they both formed a new interface. The formed interface caused the increment of the IFT values. The outcomes proved that APG was the most dominant surfactant as it had the highest impact on the mixture behaviour. It is believed that the outcomes of this work are expected to provide a better fundamental understanding of the surfactant partitioning behaviour in high temperature and high salinity conditions, as well as providing a basic guideline to design efficient surfactant flooding slugs.

Optimization of determination of CO2 gas hydrates surface tension in the presence of non-ionic surfactants and TBAC

The gas hydrates formation, in spite of its disadvantages, has some advantages such as separating, transferring and storing gas. Therefore, determining the appropriate promoters for the gas hydrates’ formation is as important as selecting an appropriate inhibitor. One of the effective promoters is Tetra-N-Butyl ammonium chloride (TBAC). Due to TBAC'snon-destructive environmental effects and its extraordinary effect on the thermodynamics of gas hydrates, this salt is one of the most widely used promoters. TBAC was discussed in the context of hydrate structure formation and Alkyl Poly Glucoside (APG) as a nonionic surfactant due to biodegradability, emulsifiers, and reasonable prices. In this study, the surface tension between CO2hydrates was evaluated at constant temperatures and pressures with different concentrations. For this purpose, the classical nucleation theory has been used. The experimental data show that at constant temperature, the induction time was reduced by increasing the TBAC concentration and adding APG. Also, the surface tension value reduced significantly by adding APG, led to an upward trend with increasing temperature. Finally, the surface tension values obtained from the developed method were compared by presented correlations. The results of the developed model are in satisfactory agreement with literature data.

Phase behavior and microstructure of sugar surfactant-ionic liquid microemulsions

Microemulsions have been explored as a unique and versatile reaction media for a variety of chemical reactions, viz. nanoparticle preparation, organic synthesis, bio-organic synthesis etc. The phase behavior and microstructure of a ternary system water/1-butyl-3-methylimidazolium hexafluorophosphate/Sugar Surfactant was studied as a function of temperature and sugar surfactant mass fraction, γ. In the present study, a hydrophobic ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate was used to replace commonly used organic solvents (n-alkanes) as an oil/non-polar phase substitute in ternary microemulsion formulations, wherein, a sugar based alkyl polyglycoside nonionic surfactant was used instead of a conventional nonionic surfactant (i.e., alkyl polyoxyethylene ether class) to solubilize hydrophobic ionic liquid and water. The effect of alkanols of variable chain length (octanol, decanol and dodecanol) as co-surfactant on the phase behavior and microstructure of ionic liquid/sugar surfactant/water ternary microemulsion systems was also investigated. The ability of nonionic sugar-based surfactant n-decyl β-D-maltoside, and n-dodecyl β-D-maltoside, to solubilize oil (hydrophobic ionic liquid) and water, i.e., was evaluated. Moreover, phase behavior and microstructure of ternary systems, 1-butyl-3-methylimidazolium tetrafluoroborate:water (1:1)/sugar surfactant/n-alkanes (alkanes of varying chain length, i.e., octane, decane and dodecane) was also studied. Solubilization of a water insoluble dye, Sudan Red, in selected microemulsion systems was also investigated.

Application of alkyl polyglycosides for enhanced bioremediation of petroleum hydrocarbon-contaminated soil using Sphingomonas changbaiensis and Pseudomonas stutzeri

Bioremediation is considered a cost-effective and environmentally sound method for degradation of petroleum hydrocarbons in contaminated soils. This study investigated the effects of biosurfactant alkyl polyglycosides (APG) on enhanced biodegradation of petroleum hydrocarbon-contaminated soils using Sphingomonas changbaiensis and Pseudomonas stutzeri and explored the mechanism responsible for the enhanced petroleum hydrocarbon degradation. To accomplish this, the following treatments were evaluated: (1) bioaugmentation with Sphingomonas changbaiensis; (2) bioaugmentation with Pseudomonas stutzeri; (3) a combination of Sphingomonas changbaiensis and APG; and (4) a combination of Pseudomonas stutzeri and APG. The results showed that the degradation rates of total petroleum hydrocarbons (TPH) in contaminated soil samples bioaugmented with S. changbaiensis and P. stutzeri for 30 days were 39.2 ± 1.9% and 47.2 ± 1.2%, respectively. The addition of biosurfactant APG enhanced the bioremediation processes and improved the biodegradation rates. The biodegradation rate at 1.5 g/kg APG in soil samples bioaugmented with S. changbaiensis was 52.1 ± 2.0%, while the rate at 1.5 g/kg APG in soil samples bioaugmented with P. stutzeri was 59.0 ± 1.8%. The half-life decreased from 39.7 d to 24.5 d and from 29.6 to 20.1 d when the dosage of APG was 1.5 g/kg in contaminated soil samples bioaugmented with S. changbaiensis and P. stutzeri, respectively. Mechanism studies showed that the addition of APG can increase the TPH solubility, promote the sorption of TPH onto microbial cells and subsequent trans-membrane transport by APG-induced structural changes, stimulate microbial activities and participate in the co-metabolism. Therefore, the combination of bioaugmentation and APG is an effective method for remediation of petroleum hydrocarbon-contaminated soil.

Alkyl polyglucosides for potential application in oil recovery process: Adsorption behavior in sandstones under high temperature and salinity

This study is primarily focusing on the adsorption behavior of alkyl polyglucosides (APG) in sandstones under high temperature and salinity, which is rarely reported before. The results indicate that the adsorption quantity of APG on the sandstone surface is concentration dependent and the adsorption process is spontaneous in terms of Gibbs free energy change (ΔGo), and the adsorption behavior can be exactly fitted by the Langmuir/Freundlich isotherm models. Under the high temperature, APG adsorption at the sandstone is proven to be an entropy-driven spontaneous process. It is also found that, with increasing of solution salinity, the adsorption quantity on sandstone surface increases sharply. The dynamic adsorption behavior of APG suggests that the saturated adsorption quantity is detected at 0.14–0.31 mg/g in porous media, which is much smaller than that under the static condition. Ultimately, the investigation verifies that APG has certain competitive advantages in terms of IFT reduction, wettability alteration, dynamic adsorption loss, pro-environment and cost, causing a great potential for application in enhanced oil recovery.

Aqueous Foam Stabilized by an in Situ Hydrophobic Polymer via Interaction with Alkyl Polyglycoside for Enhancing Oil Recovery

The stability of foams is a critical consideration given their numerous applications. Toward this effort, the hydrophobically associating water-soluble polymer (HAWP) was applied together with alky...

Modified Biosurfactant Cationic Alkyl Polyglycoside as an Effective Additive for Inhibition of Highly Reactive Shale

The wellbore instability caused by shale hydration in highly reactive shale formation is a troublesome problem during the oil and gas drilling process. In this study, cationic alkyl polyglycoside (...