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Method for purifying ampholytic surface active agent with electric dialyze desalinisation

A surfactant and electrodialysis technology, applied in the field of membrane separation, can solve the problems of low cost, low energy consumption, restricted development, etc., and achieve the effect of low cost and simple operation

Inactive Publication Date: 2008-08-27
JIANGNAN UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is aimed at the characteristics of amphoteric surfactants, and proposes a method for purifying amphoteric surfactants by electrodialysis desalination, which can effectively remove inorganic salts in amphoteric surfactants, and has The characteristics of material separation under variable conditions, low cost, no pollution, low energy consumption, to a certain extent solve the problem of limiting the development of amphoteric surfactants due to the difficulty in the purification of inorganic salts

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  • Method for purifying ampholytic surface active agent with electric dialyze desalinisation
  • Method for purifying ampholytic surface active agent with electric dialyze desalinisation
  • Method for purifying ampholytic surface active agent with electric dialyze desalinisation

Examples

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Effect test

Embodiment 1

[0019] Example 1 Electrodialysis desalination of α-decyl betaine solution

[0020] The pH value of the α-decyl betaine solution containing NaCl was adjusted to 7.5. It is measured that the mass percentages of α-decyl betaine and inorganic salts are 10% and 3% respectively. Put 1L of the above solution into the storage tank of the dilute chamber, use 1L of 0.05mol / L NaCl solution as the initial solution of the concentrated chamber, and use 1L of sodium hydroxide and sulfuric acid solutions with a concentration of 0.05mol / L as the cathode and anode chambers respectively. Solution, under the operating conditions of 10V operating voltage and 20L / h flow rate of the dilute chamber, the α-decyl betaine solution is desalted in a cycle. The dialysis ends when the conductivity of the dilute solution no longer decreases. The desalination rate was 97%, and the recovery rate of α-decyl betaine was 82.7%.

Embodiment 2

[0021] Embodiment 2 Electrodialysis desalination of dodecylsulfopropyl betaine solution

[0022] Adjust the pH value of the dodecylsulfopropyl betaine solution containing unknown inorganic salt to 7.2. The mass percentages of dodecylsulfopropyl betaine and inorganic salts were measured to be 31% and 13% respectively. Put 0.9L of the above solution plus 0.1L of water into the storage tank of the dilute chamber, use 1L of 0.05mol / L NaCl solution as the initial solution of the concentrated chamber, and use 1L each of sodium hydroxide and sulfuric acid solutions with a concentration of 0.05mol / L As the cathode and anode chamber solutions, the dodecyl sulfopropyl betaine solution is desalted in circulation under the operating conditions of 14V operating voltage and 23L / h dilute chamber flow rate. The dialysis ends when the conductivity of the dilute solution no longer decreases. The desalination rate is 95%, and the recovery rate of dodecyl sulfopropyl betaine is 73.6%.

Embodiment 3

[0023] Embodiment 3 Electrodialysis desalting of lauryl amidopropyl betaine solution

[0024] Adjust the pH of the lauryl amidopropyl betaine solution containing unknown inorganic salts to 6.5, and measure the mass percentages of lauryl amidopropyl betaine and inorganic salts to be 5% and 1% respectively. Put 1L of the above solution into the storage tank of the dilute room, and add 1L of 0.05mol / L NaNO 3 The solution is used as the initial solution of the concentrated chamber, and each 1 L of sodium hydroxide and sulfuric acid solution with a concentration of 0.05 mol / L is used as the solution of the cathode and anode chambers respectively. The solution is cyclically desalinated. The dialysis ends when the conductivity of the dilute solution no longer decreases. The desalination rate was 97%, and the recovery rate of lauryl amidopropyl betaine was 78.2%.

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Abstract

The invention provides a method for purifying an amphoteric surface active agent by using electric dialysis and desalting, and belongs to the technology field of membrane separation. The invention makes use of the characteristic that the amphoteric surface active agent does not move towards two poles when the amphoteric surface active agent is within the isoelectric point scope; through electrodialysis treatment, the small molecules of inorganic salt enters a thick chamber and amphoteric surface active agent molecules stay in a thin chamber so that the inorganic salt is separated and removed, thus purifying the amphoteric surface active agent. The applied amphoteric surface active agent has the structure of amino acid or lycine or the imidazoline-type structure. The invention can effectively remove the inorganic salt in the amphoteric surface active agent without phase transformation or pollution during separation by consuming low energy at low cost, which solves the problem that the development of the amphoteric surface active agent is restricted as the inorganic salt is difficult to be purified, and provides an economic effective way for separation of the inorganic salt from the amphoteric surface active agent in production.

Description

technical field [0001] The invention discloses a method for purifying amphoteric surfactants by electrodialysis desalination, which belongs to the technical field of membrane separation. Specifically, it is a method in which small inorganic salt molecules in an amphoteric surfactant solution move directionally under the action of an electric field and selectively pass through an ion exchange membrane to separate from the amphoteric surfactant. Background technique [0002] Amphoteric surfactants have both non-ionizable positive and negative charge centers (or dipole centers) in the same molecule, and have low toxicity and low irritation, good biodegradability, effective bactericidal properties and excellent compatibility. In the process of synthesizing amphoteric surfactants, small inorganic salt molecules are often unavoidably produced, resulting in negative effects such as high product viscosity, unstable pH value, or decreased chemical stability, which affect the excellen...

Claims

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Application Information

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IPC IPC(8): B01D61/42B01D61/46B01F17/00C09K23/00
CPCY02A20/124
Inventor 方云齐丽云马娜
Owner JIANGNAN UNIV
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