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Glycine crystallization method capable of recovering solventing-out agent

A glycine and eluting agent technology, applied in the field of glycine purification and preparation, can solve problems such as excessive energy consumption, inconvenient equipment maintenance, and complicated operation process, and achieve the effects of eliminating batch differences, less pollution, and low temperature

Inactive Publication Date: 2020-04-14
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional method has its own limitations, such as excessive energy consumption, large equipment footprint, complicated operation process, inconvenient equipment maintenance, easy introduction of third-party substances and low recovery rate of eluents, etc.

Method used

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  • Glycine crystallization method capable of recovering solventing-out agent
  • Glycine crystallization method capable of recovering solventing-out agent
  • Glycine crystallization method capable of recovering solventing-out agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Crystallization preparation of glycine:

[0027] 1) Add glycine-ethanol-jelly mother liquor with an effective volume of 290ml into the dissolution crystallizer, wherein ethanol is 49.29% of the total mass of the mother liquor, and glycine is 1.43% of the total mass of the mother liquor.

[0028] 2) Continue to add glycine solids with a total mass of 9.05% of the glycine-ethanol-jelly mother liquor into the dissolution crystallizer and start stirring at a stirring rate of 300 rpm.

[0029] 3) Continuously adding saturated glycine aqueous solution and mass fraction in the dissolution crystallizer with a certain feed rate is 85% ethanol water solution, and simultaneously discharges the magma produced in the dissolution crystallizer continuously at a certain rate, the entire crystallization process The temperature is 25°C.

[0030] The feed rate of the saturated glycine aqueous solution is 96ml / h, the feed rate of the ethanol aqueous solution is 147ml / h, and the dischar...

Embodiment 2

[0042] 1. Crystallization preparation of glycine:

[0043] 1) Add glycine-ethanol-jelly mother liquor with an effective volume of 290ml into the dissolution crystallizer, wherein ethanol is 49.29% of the total mass of the mother liquor, and glycine is 1.43% of the total mass of the mother liquor.

[0044] 2) Continue to add glycine solids with a total mass of glycine-ethanol-jelly mother liquor of 11.17% into the dissolution crystallizer and start stirring at a stirring rate of 300 rpm.

[0045] 3) Continuously adding saturated glycine aqueous solution and mass fraction in the dissolution crystallizer with a certain feed rate is 85% ethanol water solution, and simultaneously discharges the magma produced in the dissolution crystallizer continuously at a certain rate, the entire crystallization process The temperature is 25°C.

[0046]The feed rate of the saturated glycine aqueous solution is 96ml / h, the feed rate of the ethanol aqueous solution is 147ml / h, and the discharge r...

Embodiment 3

[0057] 1. Crystallization preparation of glycine:

[0058] 1) Add glycine-ethanol-jelly mother liquor with an effective volume of 198ml into the dissolution crystallizer, wherein ethanol is 32.07% of the total mass of the mother liquor, and glycine is 3.79% of the total mass of the mother liquor.

[0059] 2) Continue to add glycine solids with a total mass of 10.1% of glycine-ethanol-jelly mother liquor into the dissolution crystallizer and start stirring at a stirring rate of 300 rpm.

[0060] 3) Continuously adding saturated glycine aqueous solution and mass fraction in the dissolution crystallizer with a certain feed rate is 85% ethanol water solution, and simultaneously discharges the magma produced in the dissolution crystallizer continuously at a certain rate, the entire crystallization process The temperature is 25°C.

[0061] The feed rate of the saturated glycine aqueous solution is 96ml / h, the feed rate of the ethanol aqueous solution is 69ml / h, and the discharge ra...

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Abstract

The invention provides a glycine crystallization method capable of recovering a solventing-out agent, which realizes recovery of the solventing-out agent while preparing glycine by continuous solventing-out crystallization, and also provides a corresponding solventing-out agent recovery device. According to the continuous glycine elution and crystallization method provided by the invention, a uniform product with the maximum average particle size of 1034.841 mu m can be produced, the particle sizes of the products produced after the experimental process is balanced have no difference, and thedifference between batches of product quality is eliminated; compared with a semi-batch solventing-out crystallization process, the method also has the advantages of low temperature, low energy consumption and less pollution in the crystallization process; low-content ethanol in the mother liquor can be recycled in the form of high-concentration ethanol through film-passing treatment of the motherliquor, and the problems that in a traditional mother liquor recovery method, energy consumption is too large, the occupied area of equipment is large, the operation process is complex, the equipmentis inconvenient to maintain, a third-party substance is easily introduced, and the recovery rate of th solventing-out agent is low can be solved.

Description

Technical field: [0001] The invention relates to the field of purification and preparation of glycine, in particular to a continuous elution and crystallization method of glycine with recyclable eluent. Background technique: [0002] Glycine is easily soluble in water, but insoluble in ether, acetone and ethanol. Glycine is odorless, non-toxic, non-irritating, and has good biocompatibility. In the field of medicine, glycine can be used to synthesize drugs, as solvents and buffers for drugs. In the chemical industry, glycine can be used to prepare surfactants and as biochemical reagents. In the field of food, glycine can be used as seasoning, sweetener, antioxidant and preservative. [0003] Although the chemical synthesis route in domestic glycine industrial production is relatively mature, there are still problems such as uneven product particle size distribution and large batch fluctuations in the subsequent crystallization process. These problems restrict the producti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C227/42C07C229/08C07C31/08C07C29/80C07C29/76B01D5/00
CPCC07C227/42C07C29/80C07C29/76B01D5/006B01D5/0072C07B2200/13C07C229/08C07C31/08Y02P20/50Y02P70/10
Inventor 朱亮付晓卉沙作良王彦飞杨立斌赵晓昱项军
Owner TIANJIN UNIV OF SCI & TECH