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Method and device for recycling ammonium chloride from glycine mother liquor

A technology of glycine mother liquor and ammonium chloride, applied in ammonium halide and other directions, can solve the problems of poor operation continuity, limited production capacity, large plant footprint, etc., and achieve the effects of easier process control, fast evaporation rate, and reduced plant investment.

Active Publication Date: 2013-09-18
HUBEI XINGFA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has disadvantages such as poor operation continuity, limited production capacity, and large equipment footprint.

Method used

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  • Method and device for recycling ammonium chloride from glycine mother liquor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Pass the mother liquor of glycine into the I-effect heater and heat it to 75°C, and then enter the I-effect evaporator and adopt vacuum preliminary evaporation and concentration, the vacuum degree of which is -0.06MPa; The difference enters the II-effect heater, and is heated to 107°C with steam, and enters the II-effect evaporator for further evaporation and concentration; the concentrated liquid in the above-mentioned II-effect evaporator is sent to the flash evaporator, and the concentrated liquid is discharged in the flash The pump is used for circulating concentration, and the concentration is flashed at a vacuum of -0.05 MPa to make the mass concentration of the concentrated solution reach 45%; the above-mentioned flashed concentrated solution is sent to the continuous crystallizer, and the continuous crystallizer is used for circulating heat exchange and cooling Crystallization; the solid-liquid mixed phase at the bottom of the continuous crystallizer is passed in...

Embodiment 2

[0013] Pass the mother liquor of glycine into the I-effect heater and heat it to 70°C, and then enter the I-effect evaporator and use vacuum preliminary evaporation and concentration, the vacuum degree of which is -0.07MPa; The difference enters the II-effect heater, and is heated to 103°C with steam, and enters the II-effect evaporator for further evaporation and concentration; the concentrated liquid in the above-mentioned II-effect evaporator is sent to the flash evaporator, and the concentrated liquid is discharged in the flash The pump is used for circulating concentration, and the concentration is flashed at a vacuum of -0.06 MPa to make the mass concentration of the concentrated solution reach 47%; the above-mentioned flashed concentrated solution is sent to the continuous crystallizer, and the continuous crystallizer is used for circulating heat exchange and cooling Crystallization; the solid-liquid mixed phase at the bottom of the continuous crystallizer is passed into...

Embodiment 3

[0015] Pass the mother liquor of glycine into the I-effect heater and heat it to 75°C, and then enter the I-effect evaporator and use vacuum preliminary evaporation and concentration, the vacuum degree of which is -0.07MPa; The difference enters the II-effect heater, and is heated to 102°C with steam, and enters the II-effect evaporator for further evaporation and concentration; the concentrated liquid in the above-mentioned II-effect evaporator is sent to the flash evaporator, and the concentrated liquid is discharged in the flash The pump is used for circulating concentration, and the concentration is flashed at a vacuum of -0.07 MPa to make the mass concentration of the concentrated solution reach 45%; the above-mentioned flashed concentrated solution is sent to the continuous crystallizer, and the continuous crystallizer is used for circulating heat exchange and cooling Crystallization; the solid-liquid mixed phase at the bottom of the continuous crystallizer is passed into...

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Abstract

The invention relates to a method and a device for recycling ammonium chloride from glycine mother liquor. The method is specially implemented as follows: after carrying out 2nd effect evaporation and concentration on glycine mother liquor containing ammonium chloride, carrying out continuous separation by crystallization on the obtained object so as to obtain ammonium chloride. The method comprises the following specific steps of: carrying out preliminary vacuum evaporation and concentration on glycine mother liquor by using an I-effect evaporator; feeding the obtained object into the I-effect evaporator to carrying out further evaporation and concentration on the obtain object; feeding the obtained object into a flash vessel, and carrying out flash vaporization and concentration on the obtained object in a vacuum state, so that the concentration of the obtained flash vaporization and concentration liquor reaches 45 + / -3%; feeding the flash vaporization and concentration liquor into a continuous crystallizer and carrying out circulating heat exchange and cooling crystallization; carrying out thickening and centrifugal separation on the obtained product so as to obtain an ammonium chloride product. In the whole process, the steam application amount is small, and the evaporation speed is rapid, so that the method and device disclosed by the invention have the characteristics of high efficiency and energy conservation, and are suitable for being widely used in workshops.

Description

technical field [0001] The invention relates to a method and equipment for recovering ammonium chloride from glycine mother liquor. Specifically, after the glycine mother liquor containing ammonium chloride is concentrated by two-effect evaporation, ammonium chloride is obtained through continuous crystallization and separation. Background technique [0002] Glycine is produced from chloroacetic acid and liquid ammonia, and the solution after the reaction contains both glycine and ammonium chloride; after glycine is separated by methanol extraction, the mother liquor contains a large amount of ammonium chloride by-product. If these mother liquors containing a large amount of ammonium chloride are discarded, it will not only cause environmental pollution, but also cause waste of resources. The traditional method is to concentrate the mother liquor containing ammonium chloride and then adopt batch cooling crystallization and separation to obtain the ammonium chloride product. ...

Claims

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Application Information

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IPC IPC(8): C01C1/16
Inventor 赵信文黄本波
Owner HUBEI XINGFA CHEM GRP CO LTD
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