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Method for recycling threonine from threonine crystallization mother liquid

A technology for crystallizing mother liquor and threonine, which is applied in the field of recycling threonine and can solve problems such as difficulty in utilization and treatment

Active Publication Date: 2012-10-03
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 recycling threonine from threonine crystallization mother liquid
  • Method for recycling threonine from threonine crystallization mother liquid
  • Method for recycling threonine from threonine crystallization mother liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0089] Step 1: Removal of inorganic salts

[0090] The bipolar membrane electrodialyzer is a one-stage, two-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 and JAM-10 type anion exchange membrane. The bipolar membrane and anion exchange membrane form a two-compartment membrane stack structure (such as Figure 4 Shown) 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.

[0091] Pass 3.0L of threonine crystallization mother liquor of 17g / L ammonium sulfate and 90g / L threonine from China Ningxia Yipin Biotechnology Co., Ltd. into the salt chamber; the ini...

Embodiment 2

[0100] Step 1: Removal of inorganic salts

[0101] Bipolar membrane electrodialyzer is the same as embodiment 1.

[0102] Pass 2.26L of threonine crystallization mother liquor containing 13.2g / L ammonium chloride and 88g / L threonine into the salt chamber; It is 1.0L, 0.25mol / L sodium sulfate solution.

[0103] 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. Air is introduced into the feed tank of the salt chamber, and the regenerated ammonia is blown out with air at a blowing volume of 1.0 liters per minute. The ammonia blown out from the salt chamber is passed into a stainless steel coil placed in a -60°C refrigerator, and at the other end of the coil. Obtain about 9.6 grams of liquid ammonia in the receiving bottle. Measure the conductivity value of the feed liquid in the salt chamber every 10 minutes, and stop the electrodialysis operatio...

Embodiment 3

[0114] Step 1: Removal of inorganic salts

[0115] Bipolar membrane electrodialyzer is the same as embodiment 1.

[0116] Pass 2.92L of threonine crystallization mother liquor containing 19.6g / L ammonium nitrate and 89g / L threonine into the salt chamber; 1.0L, 0.25mol / L sodium sulfate solution.

[0117] 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. Air is introduced into the material tank of the salt chamber, and the regenerated ammonia is blown out with air at a blowing volume of 1.5 liters per minute. The ammonia blown out from the salt chamber is absorbed in another container with 0.2L of water to obtain ammonia water with a mass concentration of about 5%. . Measure the conductance value of the feed liquid in the salt chamber every 10 minutes, and stop the electrodialysis operation when the conductance value drops to 1.1 mS / cm. In the ...

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Abstract

The invention relates to the field of amino acid production and particularly relates to a method for recycling threonine from threonine crystallization mother liquid. The method includes the following steps that 1) the bipolar membrane electrodialysis technology is adopted to remove inorganic salt from the threonine crystallization mother liquid to obtain the threonine crystallization mother liquid free of inorganic salt, wherein the bipolar membrane electrodialysis technology is the 'acid-salt' double-chamber bipolar membrane electrodialysis technology; and 2) an anion exchange method is utilized to recycle threonine from the threonine crystallization mother liquid free of inorganic salt. The method achieves the effect that the threonine is recycled from the threonine crystallization mother liquid, improves extraction yield of the threonine, further completely utilizes components in the threonine crystallization mother liquid, enables residual liquid to be subjected to the existing full-blown biological technological treatment and reach the standard and reduces pollution discharge.

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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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/44C07C229/22C07C227/40
Inventor 丛威王倩杨鹏波张圩玲田原
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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