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Process for producing methionine

A technology for the production of methionine and reactors, applied in the field of methionine production, can solve the problems of low bulk density of methionine crystals, difficulty in stabilizing methionine crystals, and high equipment costs

Inactive Publication Date: 2009-12-16
SUMITOMO CHEM CO LTD
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Problems solved by technology

[0007] It is also known that methionine crystals are often difficult to stabilize because it is plate-like and crystallization therefore requires flocculants
[0008] When the hydrolysis is carried out in a stirred continuous reactor as described above, the resulting methionine crystals have a low bulk density, resulting in high equipment costs

Method used

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  • Process for producing methionine
  • Process for producing methionine
  • Process for producing methionine

Examples

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Embodiment 1

[0069] A mixture of 5.4 parts / hour of a solution containing 5-[2-(methylthio)ethyl]imidazolidine-2,4-dione and an aqueous potassium hydroxide solution was continuously added to the non-stirring continuous first reaction tank. While carbon dioxide and ammonia produced as by-products are continuously distilled off together with water, the reaction solution is continuously fed into a non-stirring continuous second reaction tank different from the first reaction tank. At this time, the temperature of the reactor was 177° C., and the gauge pressure was 0.88 MPa. The residence time in the first reactor was 30 minutes and the residence time in the second reactor was 6 minutes, for a total of 36 minutes. After the reaction, the hydrolyzed solution thus obtained contained 10.4% potassium, 13.1% methionine and 1.29% methionine dipeptide, the ratio of methionine dipeptide to methionine being 9.9%.

[0070] One part of the hydrolyzed solution was added to the reactor, and then polyvinyl ...

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Abstract

The present invention provides a process for producing methionine, which comprises the steps of: hydrolyzing 5-[2-(methylthio)ethyl]imidazolidine-2,4-dione in the presence of a basic potassium compound in a non-stirred continuous first reaction tank, and heat-treating the reaction solution after hydrolysis in a second reaction tank. According to the process of the present invention, a methionine crystal with a higher bulk density can be produced.

Description

technical field [0001] The present invention relates to a method for producing methionine by hydrolysis reaction of 5-[2-(methylthio)ethyl]imidazolidine-2,4-dione [see reaction scheme (1) shown below]. [0002] Reaction scheme (1) [0003] Background technique [0004] Methionine can be used as an animal feed additive. [0005] As an example of a known method for producing methionine, there is a method involving the hydrolysis of 5-[2-(methylthio)ethyl]imidazolidine- 2,4-Diketones. According to this method, methionine can be isolated and obtained in crystal form by inducing crystallization by introducing carbon dioxide into the reaction solution after hydrolysis. [0006] An example of the above-mentioned methionine production method comprising performing hydrolysis in a stirred continuous reactor is disclosed (eg, JP-A 2007-99778 ). [0007] It is also known that methionine crystals are generally difficult to stabilize because it is a plate-like crystal and thus crys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C323/58C07C319/20C07C319/28
CPCC07C319/28C07C319/20C07C323/58
Inventor 古泉善行久保文雄
Owner SUMITOMO CHEM CO LTD
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