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Method for eliminating hydrochloric acid in amino acid solution by using combination process of extraction and conversion

A technology for amino acid and hydrochloric acid, which is applied in the field of removing hydrochloric acid in amino acid solution, and can solve the problems of removing free hydrochloric acid and most of combined hydrochloric acid, separation, extraction or purification of amino acids, etc.

Inactive Publication Date: 2003-10-08
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, a part of free hydrochloric acid can be removed by vacuum distillation and evaporation. A considerable part of free hydrochloric acid and all combined hydrochloric acid are difficult to directly remove from the hydrolyzate by the above method, and can only be neutralized by adding alkali, which is of great importance for further separation and extraction or Purification of amino acids is unfavorable
[0003] Retrieved papers and Chinese patents published in Chinese academic journals until the end of 2001, there is no relevant report or technical method for completely removing free hydrochloric acid and most of combined hydrochloric acid directly from amino acid solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0010] The pig hair is hydrolyzed with industrial hydrochloric acid, and the hydrochloric acid content is about 8.5mol / L. This hydrolyzate is stirred and mixed with the extractant of the following composition and contacted:

[0011] Trialkyl tertiary amine (N235) 40%

[0012] Kerosene 60% until the pH of the hydrolyzate is 2.0, let it stand until the phase separation is clear. During this operation, crystallization and precipitation will occur, and after filtration, the hydrochloric acid content (in terms of chloride ion) in the filtrate water phase is about 4mol / L. Add 1:1 (volume ratio) sulfuric acid solution to the filtrate until the sulfuric acid concentration is about 2mol / L, stir for about ten minutes, and still use the above-mentioned organic extractant to extract the aqueous phase to a pH of about 2.0. Take out the water phase, add calcium hydroxide while stirring until the pH of the water phase is 3.5, filter, and then neutralize th...

example 2

[0014] The human hair hydrolyzate is distilled under reduced pressure to catch acid, and the hydrochloric acid content is about 5.5mol / L. This hydrolyzate is contacted with an organic extractant of the following composition:

[0015] Trialkyl tertiary amine (N235) 40%

[0016] Kerosene 60% organic extractant and hydrolyzate were added in one volume ratio of 1:2, stirred and contacted for one hour, the strength of the stirring was enough to completely mix the two phases. Stand still, separate the phases, there is precipitation in the water phase, take out the water phase together with the precipitation and filter, the hydrochloric acid (calculated as chlorine) containing about 4mol / L in the filtrate, add a sulfuric acid solution with a volume ratio of 1:1, until the sulfuric acid content is 2mol / L, add the above-mentioned extractant and extract in the device of Fig. 1 until the pH of the water phase is 2.0-2.5, separate the water ph...

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PUM

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Abstract

A process for removing hydrochloric acid from amino acid solution by extraction-displacement method includes displacing hydrochloric acid binded with amino acid with sulfuric acid, phosphoric acid, or carbonic acid, extracting and separating free hydrochloric acid from amino acid solution with the extractant composed of organic amine and aromatic hydrocarbon, and conventionally removing said sulfuric acid, phosphoric acid and carbonic acid. Its advantage is high effect (more than 95%).

Description

1. Technical field [0001] The invention relates to a method for removing hydrochloric acid in an amino acid solution. 2. Background technology [0002] In a solution containing amino acids and hydrochloric acid, hydrochloric acid can be divided into two different forms: one is free hydrochloric acid, which is not combined with amino acids; the other is combined hydrochloric acid, which is combined with various groups in amino acid molecules. combined. Usually a part of free hydrochloric acid can be removed by vacuum distillation and evaporation, but a considerable part of free hydrochloric acid and all combined hydrochloric acid are difficult to directly remove from the hydrolyzate by the above method, and can only be neutralized by adding alkali, which is very important for further separation and extraction or Purification of amino acids is disadvantageous. [0003] Retrieve papers and Chinese patents published in Chinese academic journals until the end of 2001, and there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C227/40
Inventor 翁连进王士斌甘林火
Owner HUAQIAO UNIVERSITY