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Method for extracting free L-lysine from ammonia water eluate by membrane method

A technology of lysine and eluent, which is applied in the field of free L-lysine purification, can solve the problems of high energy consumption and large amount of wastewater, and achieve reduced energy consumption and operating costs, long life, reduced water consumption and The effect of water production

Inactive Publication Date: 2020-02-04
HANGZHOU BLUETEC ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method for purifying L-lysine in ammonia water eluent by membrane method to solve the problems of large amount of waste water and high energy consumption produced by ammonia water elution in the lysine preparation process in the prior art

Method used

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  • Method for extracting free L-lysine from ammonia water eluate by membrane method
  • Method for extracting free L-lysine from ammonia water eluate by membrane method

Examples

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Effect test

Embodiment 1

[0033] Take 183g of L-lysine hydrochloride and dissolve it in 175g of 20% ammonia water. After fully reacting, add pure water to 1000g to simulate the eluent of ammonia water. At this time, the concentration of free L-lysine is 14.6%. 4 The Cl concentration was 5.85%, and the pH was 9.89. Alloy membrane electrodialysis device (effective membrane area is 0.055m 2 ) extract the method for L-lysine in the ammonia eluent, comprise the steps:

[0034] Step S1, refer to the attached figure 2 , prepared 4% (NH 4 ) 2 SO 4 The solution is placed in the polar water tank (7), 1000 g of pure water is placed in the concentrated water tank (8) of the electrodialysis device, and the eluent obtained above is placed in the fresh water tank (9). Set the operating voltage and current, turn on the power supply, and continue to add dilute acid to keep the pH of the solution at the isoelectric point of L-lysine. Free L-lysine remains in the fresh water chamber in the form of molecules (3), an...

Embodiment 2

[0039] Take 549g of L-lysine hydrochloride and dissolve it in 525g of 20% ammonia water. After fully reacting, add pure water to 3000g to simulate the eluent of ammonia water. At this time, the concentration of free L-lysine is 14.6%. 4 Cl concentration is 5.85%, pH is 10, alloy membrane electrodialysis device (effective membrane area is 1m 2 ) extract the method for L-lysine in the ammonia eluent, comprise the steps:

[0040] Step S1, refer to the attached figure 2 , prepared 4% (NH 4 ) 2 SO 4 The solution is placed in the pole water tank (7), 3000g of pure water is placed in the concentrated water tank (8) of the electrodialysis device, the eluent obtained above is placed in the fresh water tank (9), the operating voltage and current are set, and the power supply is switched on for a continuous The dilute acid keeps the pH of the solution at the isoelectric point of L-lysine, and the free L-lysine remains in the fresh water chamber in the form of molecules (3). The exp...

Embodiment 3

[0045] Get 91.5g of L-lysine hydrochloride and dissolve it in 87.5g of 20% ammonia water. After fully reacting, add pure water to 500g to simulate the ammonia eluent. At this time, the free L-lysine concentration is 14.6%. NH 4 Cl concentration is 5.85%, pH is 9.59, homogeneous membrane electrodialysis device (effective membrane area is 0.055m 2 ) extract the method for L-lysine in the ammonia eluent, comprise the steps:

[0046] Step S1, refer to the attached figure 2 , prepared 4% (NH 4 ) 2 SO 4 The solution is placed in the pole water tank (7), 700g of pure water is placed in the concentrated water tank (8) of the electrodialysis device, the eluent obtained above is placed in the fresh water tank (9), the operating voltage and current are set, and the power is turned on for a continuous Add dilute acid to keep the pH of the solution at the isoelectric point of L-lysine. Free L-lysine remains in the fresh water chamber (3) in the form of molecules. The experiment runs ...

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Abstract

The invention relates to the technical field of purification of free L-lysine and particularly relates to a method for extracting the free L-lysine from ammonia water eluate by a membrane method. According to the method, the free L-lysine is extracted by innovatively utilizing an electrodialysis plant, NH4Cl is effectively removed from the ammonia water eluate, and electrodialysis light water is subjected to depressurized concentration and vacuum baking, so as to obtain free L-lysine crystals; and a NH4Cl solution of electrodialysis concentrated water is subjected to electrodialysis concentrating of a section and then is evaporated, thereby obtaining an industrial grade NH4Cl product. According to the technology disclosed by the invention, the removal rate of Cl<-> reaches up to 99%, the recovery rate of the free L-lysine is higher than 95%, the traditional ion-exchange resin exchange method is replaced, the water consumption and water yield are reduced, the energy consumption is lowered, the operating cost is reduced; and the electrodialysis plant can be reused, and an ion exchange membrane has no need of regeneration and is relatively long in life.

Description

technical field [0001] The invention relates to a method for purifying free L-lysine, in particular to a method for extracting free L-lysine in ammonia water eluent by membrane method. Background technique [0002] Lysine is the basic unit of protein. It is the raw material for the synthesis of human hormones, enzymes and antibodies. It participates in human metabolism and various physiological activities. Lysine is an essential amino acid for the human body. Lysine can also be used as an auxiliary therapeutic agent for diuretics to treat aluminum poisoning caused by the reduction of chloride in the blood; it can increase the secretion of pepsin and gastric acid, and can promote the appetite of the elderly and children; it can inhibit hypertension when used in combination with methionine ; Together with iron compounds, it has a significant effect on the treatment of anemia; at the same time, lysine is also an excellent antithrombotic agent. In recent years, with the rapid d...

Claims

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Application Information

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IPC IPC(8): C02F9/10C07C227/40C07C229/26
CPCC01C1/164C02F1/048C02F1/4693C02F1/66C02F9/00C02F2101/16C02F2101/38C07C227/40C07C229/26
Inventor 张梦臣邓德涛余诗华
Owner HANGZHOU BLUETEC ENVIRONMENTAL TECH
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