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Method for recovering threonine from threonine crystallization mother liquor

A technology for crystallizing mother liquor and threonine, which is applied in the field of threonine recovery and can solve problems such as difficult to use and difficult to manage

Inactive Publication Date: 2013-05-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects that the threonine crystallization mother liquor produced during threonine production is difficult to use and difficult to manage, and to provide a method for recovering threonine from the threonine crystallization mother liquor

Method used

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  • Method for recovering threonine from threonine crystallization mother liquor
  • Method for recovering threonine from threonine crystallization mother liquor
  • Method for recovering threonine from threonine crystallization mother liquor

Examples

Experimental program
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Effect test

Embodiment 1

[0092] Step 1: Removal of inorganic salts

[0093] The bipolar membrane electrodialyzer is a one-stage, three-chamber bipolar membrane electrodialyzer that operates independently, and the liquid flow direction in adjacent compartments adopts a parallel flow form. The area of ​​the ion exchange membrane is 210mm×62mm, using BP-1 type bipolar membrane, JAM-10 type anion exchange membrane and JCM-1 type cation exchange membrane. Bipolar membrane, anion exchange membrane, and cation exchange membrane form a three-compartment membrane stack structure (such as Figure 5Shown) Repeat for 5 pairs. A titanium-coated ruthenium electrode is used as the anode plate, and a stainless steel electrode is used as the cathode plate. Both the partition and the net are polypropylene materials, the partition is a non-loop partition, and the partition is a woven mesh type.

[0094] Pass 2.5L of threonine crystallization mother liquor containing 19g / L sodium sulfate and 68g / L threonine from China...

Embodiment 2

[0104] Step 1: Removal of inorganic salts

[0105] Bipolar membrane electrodialyzer is the same as embodiment 1.

[0106] Pass 3.6L of threonine crystallization mother liquor containing 15g / L sodium chloride and 68g / L threonine into the salt chamber; L), the initial liquid in the alkali chamber is 1.0L, 0.05mol / L sodium hydroxide solution, and the liquid in both pole chambers is 1.0L, 0.25mol / L sodium sulfate solution.

[0107] Control current density 30mA / cm during operation 2 , the linear velocity of liquid flow in each compartment is 3cm / s, and the temperature of feed liquid in each compartment is 30°C. Measure the conductivity value of the feed solution in the salt chamber every 10 minutes, and stop the electrodialysis operation when the conductivity value drops to 1mS / cm. Obtain about 1.22L of acidified threonine sterilized fermentation broth containing about 0.64mol / L of hydrochloric acid in the acid chamber. Get about 1.1L of sodium hydroxide with a concentration of...

Embodiment 3

[0117] Step 1: Removal of inorganic salts

[0118] Bipolar membrane electrodialyzer is the same as embodiment 1.

[0119] Pass 2.8L of threonine crystallization mother liquor containing 21g / L sodium nitrate and 88g / L threonine into the salt chamber; The sodium hydroxide solution of 1.0L, 0.05mol / L, and the sodium sulfate solution of 1.0L, 0.25mol / L are all liquids in the two pole chambers.

[0120] Control current density 30mA / cm during operation 2 , the linear velocity of liquid flow in each compartment is 3cm / s, and the temperature of feed liquid in each compartment is 30°C. Measure the conductivity value of the feed solution in the salt chamber every 10 minutes, and stop the electrodialysis operation when the conductivity value drops to 0.6mS / cm. In the acid chamber, about 0.66 L of nitric acid with a concentration of about 0.93 mol / L is obtained. Get about 0.43L of sodium hydroxide with a concentration of about 1.43mol / L in the alkali chamber. 2.22 L of threonine crys...

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Abstract

The present invention relates to the field of amino acid production, particularly to a method for recovering threonine from a threonine crystallization mother liquor. The method comprises the following steps: 1) adopting a bipolar membrane electrodialysis technology or a common electrodialysis technology to remove inorganic salts from a threonine crystallization mother liquor to obtain an inorganic salt-removed threonine crystallization mother liquor, wherein the bipolar membrane electrodialysis technology is an acid-salt-alkali three-chamber bipolar membrane electrodialysis technology; and 2) adopting a cation exchange method to recover threonine from the inorganic salt-removed threonine crystallization mother liquor. With the present invention, recovery of the threonine from the threonine crystallization mother liquor is achieved, a threonine extraction yield is increased, complete utilization of various components in the threonine crystallization mother liquor can be further achieved, and the residue liquid can be treated by using the existing mature biotechnology so as to achieve standard discharge, and reduce pollution emission.

Description

technical field [0001] The invention relates to the field of amino acid production, in particular to a method for recovering threonine from threonine crystallization mother liquor. Background technique [0002] Threonine, the scientific name is 2-amino-3-hydroxybutyric acid (Threonine Itaconic acid), referred to as Thr), the molecular formula is C 4 h 9 o 3 N. Its properties are white orthorhombic or crystalline powder, odorless, slightly sweet taste, solubility in water at 25°C is 20.5g / 100mL, insoluble in ethanol, ether and chloroform. L-threonine is an essential amino acid, mainly used in medicine, chemical reagents, food fortifiers, feed additives, etc. [0003] At present, the fermentation method has become the mainstream method for the production of threonine. In the method, glucose and sucrose are used as raw materials, lactose fermenting bacillus is used as a bacterial strain to produce threonine under aeration condition, and ammonia is added in the fermentation...

Claims

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Application Information

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IPC IPC(8): B01D61/44C07C229/22C07C227/40
Inventor 丛威杨鹏波王倩张圩玲田原
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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