Aqueous Hydrochloric Acid Solutions Research Articles

Corrosion Resistances of VT1-0 Titanium and VT6 Titanium Alloy Obtained by the Method of Powder Metallurgy in Aqueous Solutions of Hydrochloric Acid

Corrosion Resistances of VT1-0 Titanium and VT6 Titanium Alloy Obtained by the Method of Powder Metallurgy in Aqueous Solutions of Hydrochloric Acid

ЭЛЕКТРОХИМИЧЕСКОЕ ПОВЕДЕНИЕ МЕЛЬХИОРОВОГО ЭЛЕКТРОДА В КИСЛОЙ СРЕДЕ

The electrochemical properties of the cupronickel electrode polarized by an alternating current in an aqueous solution of hydrochloric acid were studied for the first time. The electrochemical dissolution of cupronickel was carried out in a polarization mode with a frequency of 50 Hz in pairs with a titanium electrode. The current efficiency of dissolution of Cu-Ni alloys dependence on the current density at the titanium (20-120 kA/m2) and cupronickel (200-1200 A/m2) electrodes, the concentration of a hydrochloric acid solution (0.5-5.0 M), the electrolysis duration (0.5-1.75 h) and the alternating current effect (50-300 Hz) were considered. It was observed that the current efficiency of the alloy dissolution decreases linearly with increasing current density at the cupronickel electrode, while the current density at the titanium electrode passes through a maximum value at 60 kA/m2. The dependence of the alloy dissolution on the acid concentration was studied, and the reaction order was calculated. The reaction orders for the formation of copper (I) and nickel (II) ions accounted for 0.95 and 0.85, respectively. As the frequency of the alternating current increased, the current efficiency of the cupronickel electrode dissolution changed significantly. It has been shown that high current frequencies do not provide the required anodic half-cycle duration for the oxidation reaction of the metals, as the periods change very rapidly. It was found that electrolysis is effective at a frequency of 50 Hz AC. It was observed that the dissolution rate of the copper-nickel alloy increases with increasing solution temperature. It was found that the dissolution of cupronickel in an aqueous solution of hydrochloric acid by the temperature-kinetic method takes place in the diffusion-kinetic mode. Ideally, the current efficiency values were 59% for Cu (I) ions and 15% for Ni (II) ions.

Thermodynamic Characteristics of a Series of Antimony Compounds: Standard Formation Enthalpy of Antimony Oxychloride SbOCl

The present work opens a series of publications devoted to the description of the results of determination or clarification of the formation enthalpies of certain antimony compounds that are of significant applied interest to science and technology. The measurement results of enthalpy of interaction crystalline SbCl3 and water with formation of crystalline SbOCl are given. On the basis of the obtained and literature data, the value of standard formation enthalpy of the product of this interaction --- antimony oxychloride SbOCl at temperature 298.15 K is calculated. This value coincided with the reference values within the margin of error. An attempt was made to determine the dissolution enthalpy of SbCl3 in a two-molar aqueous solution of hydrochloric acid: the obtained approximate value of this characteristic was --30 ± 2 kJ/mol

Corrosion behavior of C-22, Ti-0.2Pd and Ti-32Mo alloys in the aqueous solution of hydrochloric acid and sodium chlorate

Corrosion behavior of Hastelloy C-22, Ti-0.2Pd and Ti-32Mo alloys in the aqueous solution of hydrochloric acid and sodium chlorate was investigated. The C-22 alloy was pitted because the intergranular carbides rich in Cr and Mo would lead to the lack of corrosion-resistant elements in the adjacent area. The Ti-0.2Pd alloy was pitted because the passivation trend decreased in reducing solution and Cl− broke through the passivation film. The weigh loss rate and corrosion depth of Ti-0.2Pd alloy increased sharply after pitting corrosion, which was due to the rapid corrosion of the materials exposed inside by the corrosion medium. The Ti-32Mo alloy was pitted due to the transpassivation of Mo caused by NaClO3. In the process of corrosion, the products of reaction between Mo and Cl− formed an insoluble and dense protective film, which slowed down the corrosion rate of Ti-32Mo, that is why the weigh loss rate and corrosion depth increased slowly even if pitting corrosion happened.

Sequential leaching of copper from mill tailings with aqueous solutions of hydrochloric acid and sodium hypochlorite

This work presents an investigation of kinetics of copper leaching from mill tailings with hydrochloric acid and sodium hypochlorite at room temperature in filtration mode. The concentration of hydrochloric acid and sodium hypochlorite varied from 0.05 to 0.5 M and 0.025 to 0.1 M respectively. When the samples were leached in the sequence of five-hour leaching with solutions of hydrochloric acid, and then six-hour with sodium hypochlorite, the maximum degree of copper extraction into the solution was 32.62 %. And in case of leaching samples in the inverse direction, with a solution of sodium hypochlorite for two hours, and then with hydrochloric acid for seven hours, 87.10 % of copper was extracted, which is 2.67 times more than in the previous case. It has been shown that the sequence of using reagents in leaching has a significant impact on the efficiency of copper extraction from the tailings.

Chromatographic separation of rare earths from aqueous and ethanolic leachates of NdFeB and SmCo magnets by a supported ionic liquid phase.

The separation of rare-earth elements (REEs) from other components of end-of-life NdFeB and SmCo magnets was investigated by column chromatography. A carboxylic-acid functionalized supported ionic liquid phase (SILP) was studied as a stationary phase. The magnets were firstly leached with a dilute aqueous or ethanolic hydrochloric acid solution at room temperature. Leaching of REEs from a NdFeB magnet was similarly efficient with both lixiviants, but the REEs were more efficiently leached from a SmCo magnet with the ethanolic lixiviant. The SILP exhibited a high affinity towards trivalent cations of REEs, which were successfully recovered from the aqueous and ethanolic leachates of magnets. Divalent cations of iron and cobalt, which were the major components of the acidic aqueous leachates of magnets, were rejected by the SILP. Iron and cobalt were present as negatively charged chloro complexes in the ethanolic leachates of magnets, and were not recovered by the cation-exchanging SILP. A versatile column chromatography method is developed, suitable for the separation of REEs from iron and cobalt, either from aqueous or ethanolic leachates of permanent magnets.

Synthesis, characterization, morphology and adsorption performance towards Cu+2 ions of nano-sized homopolymers of o-aminophenol poly(o-AP)

Nanostructures with different particles size of homopolymer o-aminophenol poly(OAP) were synthesized by redox polymerization initiated by FeSO4.7H2O as redox initiator and ammonium peroxydisulfate (APS) as an oxidant in different concentrations of aqueous solutions of hydrochloric acid. The influence of synthetic parameters such as acid concentration and the presence of redox initiator were investigated. The morphology and particles size were studied by transmission electron microscope (TEM) and scanning electron microscope (SEM). The results showed that the morphology and average particle size of polymeric nanoparticles according to SEM and TEM analyses were different based upon the conditions of the polymerization. It can be seen that 0.1 M and 0.5 M of HCl in the presence of FeSO4.7H2O showed nanospheres with average diameters 63.71 nm and 84.66 nm, respectively. However, poly(OAP) of nanospheres with the average diameter of 106.66 nm were obtained by the same method except that the polymerization was carried out in the dark. Finally, the last condition of polymerization in the absence of redox intiator (FeSO4) at 0.1 M HCl, it appeared as nanoreef structure with average diameter of 153.33 nm. The physico-chemical characterization of the prepared nanoparticles was carried out by Fourier transform infrared spectroscopy (FT-IR) and X-ray powder diffraction (XRD). Which FT-IR confirmed the structure of poly(OAP) nanoparticles in emeraldine form. The molecular weight was determined by gel permeation chromatography (GPC). The surface area of nanopolymer particles was determined also by Brunauer–Emmett–Teller (BET). The competition of the prepared nano-sized homopolymers particles towards the adsorption of copper ions from aqueous solutions was investigated. The results showed that the adsorption capacity was based on particle size of nanopolymers and their surface area. The adsorption capacity increased with decreasing the particle size. On the other hand the adsorption capacity increased with increasing the surface area of the prepared nano-sized homopolymers of poly(OAP). Which the nano-sized of poly(OAP) of particle size 63.71 nm had the highest adsorption capacity of Cu+2 ions with 60.4 mg/g

Dependence of Phosphorus Recovery on Acid Type during Dissolution–Precipitation Treatment of Incineration Ash of Chicken Manure

In order to utilize chicken manure as a source of phosphorus, we used dissolution-precipitation treatment to recover phosphorus from the incineration ash of chicken manure (IACM), which was used as fuel to power a boiler. In order to recover useful phosphorus-containing solids from IACM, it was dissolved into aqueous solutions of either nitric acid, hydrochloric acid, or sulfuric acid to elute phosphorus together with various component elements, followed by the use of aqueous NH3 to form a precipitate containing phosphorus. In using nitric acid and hydrochloric acid, calcium phosphate species such as calcium hydroxyapatite (Ca10(PO4)6(OH)2) and monetite (CaHPO4) were obtained following the precipitation treatment. By contrast, the use of sulfuric acid resulted in the precipitation of magnesium ammonium phosphate (MAP) species such as struvite (MgNH4PO4∙6H2O) and dittmarite (MgNH4PO4∙H2O). Both the calcium phosphate and MAP species can be used as a slow-acting fertilizer containing phosphorus, while the MAP species could be simultaneously used as a slow-acting fertilizer containing nitrogen. It is noteworthy that the calcium phosphate species obtained in the present study was equivalent to phosphate rock, which is widely used as a raw material in phosphorous-based industries, and the natural sources of this material could be depleted in the near future. Though IACM has not been used effectively until now, this new resource shows promise as s viable alternative to the dwindling supply of the natural sources of phosphorus.

Efficient recovery of bio-based 1,2,4-butanetriol by using boronic acid anionic reactive extraction

Effective isolation of 1,2,4-butanetriol (BT) from the fermentation broth with low BT concentration was achieved based on anionic reactive extraction with a combined extractant consisted of boronic acid carrier and trioctylmetylammonium Aliquat® 336 (A336) dissolved in the organic phase. The influence of various diluents, pH values, the ratio of phenylboronic acid derivatives (PBAD) to BT (αPBAD/BT), and A336 to BT (βA336/BT) on extraction property was investigated in detail. For model BT solutions, satisfactory extraction efficiency of 92% was obtained under the conditions of αPBAD/BT = 1.5, βA336/BT = 2, with dichloromethane as a diluent. Aqueous hydrochloric acid solutions were employed to strip BT from the organic phase. For actual fermentation broth, the extraction and stripping efficiency under the optimum conditions were 74% and 69%, respectively. Besides, compared with the original fermentation broth, 1,2,4-butanetriol has been concentrated by 4.6 times with the reactive extraction coupled hydrolysis.

Evaluation of the Global S-Entropy Production in Membrane Transport of Aqueous Solutions of Hydrochloric Acid and Ammonia.

The results of experimental studies of volume osmotic fluxes () and fluxes of dissolved substances () in a system containing a synthetic Nephrophan® membrane (Orwo VEB Filmfabrik, Wolfen, Germany) set in a horizontal plane are presented. The membrane separated water and aqueous HCl or ammonia solutions or aqueous ammonia and HCl solutions. It was found that for the homogeneity conditions of the solutions and depend only on the concentration and composition of the solutions. For concentration polarization conditions (where concentration boundary layers are created on both sides), and depend on both the concentration and composition of the solutions and the configuration of the membrane system. The obtained results of the and flux studies were used to assess the global production of entropy for the conditions of homogeneity of solutions (), while and —to assess the global production of entropy for concentration polarization conditions ). In addition, the diffusion-convective effects and the convection effect in the global source of entropy were calculated. The concentration polarization coefficient was related to modified concentration Rayleigh number, e.g., the parameter controlling the transition from non-convective (diffusive) to convective state. This number acts as a switch between two states of the concentration field: convective (with a higher entropy source value) and non-convective (with a lower entropy source value). The operation of this switch indicates the regulatory role of earthly gravity in relation to membrane transport.

Solvent extraction of lithium ions using benzoyltrifluoroacetone in new solvents

This work studies the solvent extraction of lithium ions from alkaline aqueous solutions by chelating agent 3-benzoyl-1,1,1-trifluoroacetone (HBTA). To develop a more eco-friendly extraction system for lithium than currently used, various hydrophobic room-temperature ionic liquids were investigated as diluents. The influence of several experimental parameters on lithium extraction was examined, including aqueous phase pH, the nature of lithium counter-ion, extractant concentration, the addition of electrically neutral co-extractant.It was found that contrary to the traditional extraction systems with molecular diluents, HBTA alone dissolved in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid extracts efficiently lithium ions from the aqueous solution. The addition of co-extractant, tri(n-octyl)phosphine oxide (TOPO) to HBTA did not result in a synergetic effect. To confirm the mechanism of lithium extraction by HBTA dissolved in ionic liquid (IL), the measurements of IL constituent ions and deprotonated HBTA concentrations in the equilibrium aqueous phase were carried out. Analysis of the results suggests that an electrically neutral lithium-HBTA extractant complex is extracted into the IL phase.The system combining HBTA extractant and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid has high selectivity for lithium over sodium but poor selectivity over calcium. We have shown also that a high stripping ratio can be obtained using relatively concentrated aqueous solutions of hydrochloric acid. Finally, it was found that the use of some deep eutectic solvents as diluents is much less efficient compared with ILs.

Enhanced separation of Pd(II) and Pt(IV) from hydrochloric acid aqueous solution using 2-((2-methoxyethyl)thio)-1H-benzimidazole

Separation of palladium (Pd) and platinum (Pt) by solvent extraction is difficult because of their extremely similar physicochemical properties. Development of new extractants with a high extraction efficiency and excellent separation selectivity is the primary focus for enhancing the separation of Pd and Pt by solvent extraction. In this study, a new extractant, 2-((2-methoxyethyl)thio)-1H-benzimidazole (MOBI), which contains N, S, and O atoms, was synthesized and used to separate Pd(II) and Pt(IV) from a hydrochloric acid aqueous solution. The experimental results revealed that Pd(II) and Pt(IV) were effectively separated under the optimal conditions: MOBI concentration of 0.005 mol·L−1, HCl concentration of 0.2 mol·L−1, organic/aqueous (O/A) phase ratio of 1.0, and contact time of 15 min. The separation coefficient between Pd(II) and Pt(IV) was 1246.40, which indicates that MOBI has a higher selectivity for Pd(II) than Pt(IV). In addition, the mechanism of coordination between Pd(II) and MOBI was demonstrated through the slope method, Fourier transform infrared spectroscopy (FTIR), hydrogen-1 nuclear magnetic resonance spectroscopy (1H NMR), and carbon-13 nuclear magnetic resonance spectroscopy (13C NMR). The results revealed that MOBI could coordinate with Pd(II) via the N atom in the benzimidazole ring of MOBI molecules to form [Pd(MOBI)2Cl2](O).

Method Development for Quantitative Determination of Diosgenin from the Seeds of Fenugreek, <i>Trigonella foenum-graecum</i> L.

Introduction . Modern pharmacognostic research is aimed at searching for plant biologically active individual compounds (RBAIS) isolated from plant extracts. Aim . Study of the content of the steroid sapogenin diosgenin in fenugreek seeds in plant extracts by HPLC-UV method. Materials and methods . The object of study was raw materials-fenugreek seeds produced as medicinal plant raw materials by LLC «Sage» (Irkutsk). Series of extraction and chromatographic separation by HPLC-UV method were performed. Results and discussion . In this work, the method of diosgenin extraction was successfully optimized (after acid hydrolysis of dioscin with a 5 % aqueous solution of hydrochloric acid when heated for at least 4 hours in a sand bath at a power of 150 W) from raw fenugreek seeds using a 50 % aqueous solution of isopropanol, h.h. A simplified technique for chromatographic separation of diosgenin from fenugreek seed extracts using an isocratic mode of 99.9 % acetonitrile elution (h.h.) was proposed. Conclusion . The average content of diosgenin (after acid hydrolysis of dioscin) in fenugreek seeds, taking into account the humidity of raw materials, is (M ± σ ) 5,3 ± 0,05 mg/g (95 % CI: 5,1-5,4 mg/g; n = 6).

Control over the Free Space within Poly(ionic liquid)s for Selective Adsorption of “Size-Matching” Dyes

Here we report a strategy to effectively control the free volumes within poly­(ionic liquid)­s (PILs). The initial parent imidazolium-based PILs were synthesized by copolymerization using three size-variant aryl boratestrifluorophenyl borate (BPhF3–), tetraphenyl borate (BPh4–), and tetranaphthyl borate (BNap4–)as couteranions. These counteranions were found to aggregate and play the role of templates and patterning holes. After exchange of the larger anions to chloride or acetate, the smaller anions occupied less inner space of holes, generating the porous structures. Impressively, depending on the types of the initial template anions, the average sizes of holes within these PILs were accurately regulated from 0.78 to 22 nm, showing various high values of specific surface areas. Their successful formation, porosity, and morphology were fully characterized by nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared spectroscopy (FT-IR), thermogravimetry analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), and elemental analysis. These porous PILs were then used for the adsorption of anionic dyes, such as Congo red, methyl blue, Sirius red, and sodium lignosulfonate. PILs were observed to show the highest adsorption capacities only toward the dyes bearing similar sizes to their average pore sizes, highlighting the size-matching effect. This phenomenon allowed us to not only separate the anionic dyes from cationic and neutral dyes based upon their charges but also selectively isolate the “size-matching” one from a mixture of anionic dyes. The adsorbed dye could be removed by washing with hydrochloric acid aqueous solution or sodium acetate methanol solution, and the PIL adsorbents could be recovered and reused at least five times without obvious decrease of adsorption efficiency.

Combined experimental and computational studies on corrosion inhibition of Houttuynia cordata leaf extract for steel in HCl medium

The development of corrosion inhibitors that could spontaneously adsorb immediately on the metal surfaces after they are damaged by electrochemical reactions would remarkably arise the improvement of cost-saving, durability and environmental impact of metals. The use of leaf materials for metal corrosion remains an important challenge due to the high corrosion protection, availability as natural materials, environmental friendly and low-cost. Herein, we report a Houttuynia cordata leaf extract as a green corrosion inhibitor that acts as a mixed type of inhibitor for steel in an aqueous 0.1 M hydrochloric acid solution. It also performs the high inhibition performance (up to 98.3% by adding 1500 ppm inhibitor), spontaneous uniform and smooth film formation of the steel surface and less corrosion attack when the H.cordata leaf extract is added to the aqueous hydrochloric acid solution. In contrast to the inhibited systems, uninhibited specimen is severely corroded at high corrosion rate, which is associated with a significant degradation of the entire steel surface. Additionally, investigation on good adhesion and thermal stability of the protective film, as well as enriched electron abundance of selected inhibitor species are performed via molecular dynamics simulation method. Furthermore, insights of corrosion, inhibition and spontaneous film formation mechanisms are also proposed and discussed in detail.

Studying dispersed and rheological properties of hydrocarbon-containing acid emulsions and their efficiency in removing asphalt-resin-paraffin deposits

Currently, the treatment of the bottomhole formation zone with acidic compositions is one of the most common methods to intensify the oil inflow. The use of various modified acid compositions increases the efficiency of acid treatments on the bottomhole formation zone. Acid compositions, including those containing hydrocarbon solvents, which contribute to more efficient removal of organic colmatants, affect the reaction rate of the reagent with the rock and processing equipment, change the reservoir properties, etc.The article presents the results of experimental studies, which are aimed at establishing the effect of the composition of hydrocarbon-containing acidic emulsions consisting of an aqueous solution of hydrochloric acid, toluene and Neonol AF 9-10 on their dispersed and rheological properties, as well as their efficiency in removing paraffin deposits.

Chemical Polishing of Aluminum Using Acid-Containing Reverse Microemulsions

Chemical polishing of metals using nanostructured media—reverse microemulsions has been studied using the example of aluminum. It has been shown that the surface roughness of aluminum foil reduced after the treatment with reverse microemulsion of sodium bis-(2-ethylhexyi)phosphate in kerosene containing an aqueous solution of hydrochloric acid with a concentration of 0.11 mol/L inside the drops. At a polishing time of 2 h, the average roughness was reduced from 54 to 28 nm. Compositions that do not form microemulsions (aqueous solution of hydrochloric acid, solution of tributylphosphate adduct with hydrochloric acid in kerosene, or dispersion of sodium bis-(2-ethylhexyl)phosphate in an aqueous solution of hydrochloric acid), have not exhibited such an effect. Additional exposure to ultrasound at the same process duration, the introduction of tributylphosphate into the microemulsion, and the replacement of hydrochloric acid with acetic or nitric acid had virtually no effect on the results of chemical polishing.

Technology for producing high-quality manganese concentrates from ferromanganese concretions and polymetallic manganese-containing ores

The results of studies of ferromanganese concretions enrichment using various solvents are presented. Universal technologies were proposed for processing manganese raw materials, including its autoclave leaching with aqueous solutions of chlorides, which allow manganese to be extracted into solution from compounds of various oxide and carbonate forms. Manganese recovery is over 90%. The introduction of ferrous manganese concretions into the chlorine-calcium enrichment process allows the extraction of manganese to be increased by 2.3, cobalt by 3.2, and nickel by 2.5 times. The leaching of ferromanganese concretions by aqueous solution of hydrochloric acid with the neutralization of its excessive concentration by the introduction of carbonate manganese ore makes it possible to extract non-ferrous metals in the solution of 99.80 – 99.88% and up to 95.4% Mn. As a result of enrichment, manganese, copper-nickel-cobalt and iron concentrates can be obtained.

Hydrolysis of particleboard bonded with urea-formaldehyde resin for recycling

In this study, the removal of urea–formaldehyde (UF) resin adhesives from waste wood particleboards (PBs) via hydrolysis was discussed, particularly the use of this application to combat environmental issues often encountered in recycling projects. Herein, the conditions required for producing PBs with poor binding properties were examined. Additionally, we determined the appropriate formaldehyde: urea (F/U) mole ratios, namely, 0.95, 1.05, and 1.15, required for generating UF resins that can be characterized and used as PB binders. The resulting values were compared with those obtained for a high mole ratio of UF resin (F/U = 2.0) as well as a commercially available PB sample for binding. Aqueous hydrochloric acid (HCl) solutions of various concentrations and water were used to leach the adhesive from the wood residues, and the effectiveness of these leaching agents was determined using a combined scanning electron microscopy–energy dispersive spectroscopy (SEM–EDS) technique in addition to the Kjeldahl method. Swelling tests were performed on the UF resins to measure the sol fraction (ωsol) and evaluate the network behavior of the resulting resins. Our results showed that factors, such as solid content, density, viscosity, and gel time, were necessary for generating an effective adhesive; herein, we determined that a solid content between 37.17 and 56.57%, density between 1.45 and 1.54 g/cm3, viscosity ranging from 115–444 MPa.s, and gel time between 8.50 and 13.13 min were feasible. Whereas the physical properties of the resulting PB (i.e., the density and moisture content) fulfilled the criteria established by the Japanese Industrial Standard, as laid out in the document entitled JIS A 5908: Particleboards (2003), the mechanical properties failed to pass the aforementioned standard as low bending strength and weak internal bonding were noted for the PBs produced. The use of hydrolyzing agents successfully decomposed the UF resin adhesives by altering their nitrogen (N) content; confirmation of this was obtained through SEM–EDS analysis along with the Kjeldahl method. Swelling tests showed that despite containing a reasonable amount of nitrogen owing to its dissolution in either HCl or water, the ωsol parameter was heavily influenced by the concentration of the hardener and type of F/U mole ratio adhesive used for the PB under investigation. These results indicate that wood residues can be used as raw materials for recycling PBs.

Isolation and purification of alkaloids from the fruits of Macleaya cordata by ionic-liquid-modified high-speed counter-current chromatography.

Macleaya cordata (Willd) R. Br. is a medicinal plant. The most important bioactive compounds of M. cordata are alkaloids that have many biological activities including antifungal, anti-inflammatory, and antitumor. In this study, an ionic-liquid-modified high-speed counter-current chromatography method was established to obtain alkaloids from the fruits of M. cordata. The conditions of ionic-liquid-modified high-speed counter-current chromatography, including solvent systems, the content of ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate [C4 mim][BF4 ]), and the posttreatment of the ionic liquid, were investigated. Five alkaloids protopine, allocryptopine, sanguinarine, 8-O-demethylchelerythrine, and chelerythrine were separated from the extract of the fruits using a high speed counter-current chromatography with two-phase solvent system composed of dichloromethane/methanol/0.3mol/L hydrochloric acid aqueous solution/[C4 mim][BF4 ] (4:2:2:0.015, v/v). Their purities were 96.33, 95.56, 97.94, 96.22, and 97.90%, respectively. The results indicated that a small amount of ionic liquids as modifier of the two-phase solvent system could shorten the separation time and improve the separation efficiency of the alkaloids from the fruits. The ionic-liquid-modified high-speed counter-current chromatography would provide a feasible way for highly effective separation of alkaloids from natural products.