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Aqueous two-phase extraction system of mixed surfactant

A surfactant and two-phase technology, applied in the field of separation, can solve the problems of difficult formation of two-phase and limited effect, and achieve the effect of low cost, easy control and wide phase range

Inactive Publication Date: 2014-06-04
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some methods have been studied to accelerate the formation of two aqueous phases and broaden the two aqueous phase regions, such as increasing the temperature, changing the pH value, adding inorganic salts or small organic molecules, etc., the effects of these methods are very limited
Especially for the equimolar ratio anion / cation surfactant mixed system that is prone to precipitation, the formation of two aqueous phases is more difficult

Method used

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  • Aqueous two-phase extraction system of mixed surfactant
  • Aqueous two-phase extraction system of mixed surfactant
  • Aqueous two-phase extraction system of mixed surfactant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take sodium dodecyl sulfate solution with a concentration of 100 mmol / L and mix equimolarly with cetyltrimethylammonium bromide solution at room temperature (2.5 mL SDS, 2.5 mL CTAB), add 10% of the total volume of the mixed system (v / v) hexafluoroisopropanol (0.5 mL), mix well, centrifuge at 2000 rpm and stand at room temperature to obtain a two-phase system with clear interface and two phases. The material composition of the two phases is detected, and the percentage of the material is shown in Table 1. The upper layer has a small viscosity and a large water content, and the lower layer has a large viscosity and a large content of surfactant and hexafluoroisopropanol.

[0033] Table 1 Substance composition and content of HFIP-induced SDS / CTAB (1:1, mol / mol) aqueous two-phase system

[0034]

Embodiment 2

[0036]Take sodium dodecyl sulfate solution with a concentration of 200 mmol / L at room temperature and mix with cetyl trimethyl ammonium bromide solution in a molar ratio of 86:14, and add 10% of the total volume of the mixed system (v / v) hexafluoroisopropanol, mixed well, centrifuged at 2000 rpm and allowed to stand at room temperature to obtain a two-phase aqueous system with a clear interface and both phases.

Embodiment 3

[0038] Take sodium dodecyl sulfate solution with a concentration of 200 mmol / L at room temperature and mix with cetyl trimethyl ammonium bromide solution in a molar ratio of 85:15, and add 10% of the total volume of the mixed system (v / v) hexafluoroisopropanol, mixed well, centrifuged at 2000 rpm and allowed to stand at room temperature to obtain a two-phase aqueous system with a clear interface and both phases.

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Abstract

The invention provides an aqueous two-phase extraction system formed by anion / cation mixed surfactant which is induced by fluoroalcohol, a preparation method and an application thereof. The aqueous two-phase extraction system comprises anion surfactant sodium dodecyl sulfate, cation surfactant hexadecyl trimethyl ammonium bromide, hexafluoroisopropanol and water. The extraction system has short phase forming time, wide phase forming range, gentle and simple phase forming condition, low consumption and high efficiency, so the extraction system is a novel extraction system. The invention can extract and separate different types of compounds through the phase forming conditions of the system, so the application prospect is good.

Description

technical field [0001] The invention belongs to the technical field of separation and relates to a fluoroalcohol-induced mixed surfactant two-phase extraction system. Background technique [0002] The aqueous two-phase extraction technology developed based on the two-phase system is a liquid-liquid extraction technology that is easy to operate and environmentally friendly. The extraction technique was first proposed by Albertsson in 1956 and applied to the extraction and separation of cells and cell debris. So far, the research and application of two-phase extraction technology has been greatly developed. [0003] In this extraction technology, when the two-phase aqueous system undergoes phase separation, the microstructure of the upper and lower phases is different, so various forces (such as hydrophobic, hydrogen bonds, electrostatic forces, etc.) will vary. The combined effect of these forces makes the extractant be selectively distributed in the two phases, so as to a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/04
Inventor 肖玉秀吴喆梅洁
Owner WUHAN UNIV
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