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Method for continuously preparing high-bulk density methionine crystals

A technology of methionine and bulk density, applied in the field of chemical production, can solve the problems of affecting the crystallization process, foaming, easy generation of bubbles, etc., and achieve the effects of good stability, high efficiency and stable product quality

Active Publication Date: 2015-07-01
SHANDONG XINHECHENG AMINO ACID +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] The present invention aims to solve the problems existing in various methionine crystallization production methods in the prior art, such as easy generation of bubbles, low bulk density, and influence on the crystallization process when using additives. The DTB neutralization crystallizer transfers the liquid phase neutralization process that is prone to foaming to the gas phase, thus fundamentally solving the foaming problem in the neutralization process

Method used

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  • Method for continuously preparing high-bulk density methionine crystals
  • Method for continuously preparing high-bulk density methionine crystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The DTB neutralization crystallizer with the gas phase neutralization section of the present invention has the following structure: the volume of the liquid phase is 1m 3 , designed according to the proportion of conventional DTB structure; the volume of the gas phase is 0.6m 3 , is a cylinder with a diameter of 600mm and a height of 2200mm with an elliptical head, with a liquid distributor on the upper part and a carbon dioxide gas distributor on the lower part.

[0065] Add 0.9m 3 Saturated solution of methionine, and then add 10Kg of methionine seed crystals that are ground to less than 10 microns. Turn on the crystallizer to stir, the stirring rate is 100rpm, turn on the external circulation pump, and adjust the flow rate of the external circulation liquid entering the washing leg to 1.6m 3 / h, the flow rate of the external circulation fluid mixed with the hydrolyzate containing potassium methionate is 10m 3 / h. After the circulating flow is stable, turn on the ...

Embodiment 2

[0069] Add 0.9m 3 Saturated solution of methionine, and then add 10Kg of methionine seed crystals that are ground to less than 10 microns. Turn on the crystallizer to stir, the stirring rate is 200rpm, turn on the external circulation pump, and adjust the flow rate of the external circulation liquid entering the washing leg to 1.5m 3 / h, the flow rate of the external circulation fluid mixed with the hydrolyzate containing potassium methionate is 20m 3 / h. After the circulating flow is stable, turn on the circulating cooling to keep the temperature stable at 20°C. Inject carbon dioxide from the gas distributor to make its pressure reach 0.4Mpa. At this time, the hydrolyzed solution containing 19% potassium methionate at 20°C is introduced, and the flow rate is 0.5m 3 / h (equivalent to a residence time of 2 hours), mixed with the external circulation material, cooled to 18°C ​​by the cooler, and then enters the liquid distributor at the top of the crystallizer, and the liqui...

Embodiment 3

[0073] Add 0.9m 3 Saturated solution of methionine, and then add 10Kg of methionine seed crystals that are ground to less than 10 microns. Turn on the crystallizer to stir, the stirring rate is 400rpm, turn on the external circulation pump, and adjust the flow rate of the external circulation liquid entering the washing leg to 4m 3 / h, the flow rate of the external circulation fluid mixed with the hydrolyzate containing potassium methionate is 10m 3 / h. After the circulating flow is stable, turn on the circulating cooling to stabilize the temperature at 35°C. Inject carbon dioxide from the gas distributor to make the pressure reach 1.0Mpa. At this time, the hydrolyzate containing 19% of potassium methionate at 35°C is introduced, and the flow rate is 2m 3 / h (equivalent to a residence time of 0.5 hours), mixed with the external circulation material, cooled to 30°C by the cooler, and then enters the liquid distributor at the top of the crystallizer, and the liquid is spraye...

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Abstract

The invention relates to a method for continuously preparing high-bulk density methionine crystals. The process of the method is as follows: a hydrolysate, which is obtained from reaction of 5-(beta-methylthioethyl)hydantoin and a potassium carbonate solution, is mixed with an outside circular material from a DTB neutralization crystallizer with a gas phase neutralization section, the mixture is cooled and enters a liquid distributor in a neutralization area in the upper part of the crystallizer, the mixture is sprayed in drops or trickles into carbon dioxide gas for neutralization reaction, and then falls naturally into a crystallization area in the lower part to be mixed with a material in the area, the mixture grows on tiny crystals in a system to form crystals with larger grain sizes, and meanwhile new crystal nucleuses are formed; in a deposition area in the middle part of the crystallization area, the crystals with larger grain sizes sink into a washing leg, the tiny crystals circulate along with the outside circular material, a part of the outside circular material is used for washing the crystals in the washing leg, and the other part of the outside circular materials is mixed with the hydrolysate; the crystals in the washing leg are separated, washed and then dried to obtain the high-bulk density methionine product.

Description

technical field [0001] The invention belongs to the technical field of chemical production. Specifically, the present invention relates to a method for continuously preparing high bulk density methionine crystals, and mainly relates to a new methionine crystallization process and an improved crystallization device. Background technique [0002] Methionine is one of the amino acids necessary for animal growth, and is currently the only sulfur-containing amino acid. It is an important feed additive. There are two forms of methionine products: solid and liquid. Currently, solid methionine dominates the world's methionine market. [0003] At present, methionine is mainly synthesized by chemical methods. According to the raw material route, there are mainly malonate method, acrolein method, amino lactone method, etc. At present, Adisseo, Soda, Sumitomo, Degussa and other major manufacturers of methionine in the world mainly use the acrolein method, which uses acrolein and meth...

Claims

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Application Information

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IPC IPC(8): C07C323/58C07C319/28B01D9/02
CPCC07C319/28C07C323/58B01D9/0013B01D9/0027B01D9/0054B01D9/0036B01D2009/0086
Inventor 陈志荣王志轩陈聪王正江王存超李寅张志香
Owner SHANDONG XINHECHENG AMINO ACID
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