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Additive used in methionine preparation process and preparation method of methionine

A technology for the preparation of methionine, applied in the field of additives, can solve problems affecting the stable operation of the continuous crystallization process, loss of regulation, defoaming effect, unstable crystallization process, etc., to achieve good crystal form, high bulk density, crystallization The effect of a smooth process

Active Publication Date: 2020-05-05
SHANDONG XINHECHENG AMINO ACID +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] The additives used in the above method all contain ester bonds, which are prone to hydrolysis under higher methionine preparation temperature conditions, thus losing the effect of adjustment and defoaming. stable, thereby affecting the stable operation of the continuous crystallization process
Moreover, there is still room for improvement in the bulk density of methionine crystalline products

Method used

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  • Additive used in methionine preparation process and preparation method of methionine
  • Additive used in methionine preparation process and preparation method of methionine
  • Additive used in methionine preparation process and preparation method of methionine

Examples

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preparation example Construction

[0079] During the preparation of methionine, a large amount of foam will be produced due to the need to feed carbon dioxide when obtaining the crude product of methionine crystallization. It will affect the stable operation of the system, and affect the shape and bulk density of the product, so it is necessary to use component B to suppress foam. In the presence of B component, A component and C component can form an emulsified state and disperse in the system.

[0080] The C component is a silicone oil with enhanced defoaming effect, which eliminates the foam generated during the crystallization process, stabilizes the crystallization environment, improves the smoothness of the crystallization, and makes the product have good fluidity.

[0081] The C component includes dimethyl silicone oil, hydroxyl silicone oil or hydrogen silicone oil. The preferred dynamic viscosity of component C at 25°C is 90mm 2 / s~1500mm 2 / s.

[0082] In the process of hydrolyzing 5-(2-methylthio...

Embodiment 1

[0103] The additive of this example is, sodium stearyl methyl taurate accounts for 6wt%, has the molecular weight that is 3000 and the polyoxyethylene polyoxypropylene ether graft silicone oil of HLB value 10 accounts for 6wt%, dynamic viscosity under 25 ℃ 90mm 2 / s of hydroxy silicone oil accounted for 3wt%, the rest is an aqueous mixture of water.

[0104] (1) In the methionine salt solution obtained by hydrolysis of 5-(2-methylthioethyl)hydantoin, add an additive based on the methionine salt solution at 300 ppm, and feed carbon dioxide under stirring , methionine crystals were precipitated in the form of reaction crystallization, and the crude methionine crystals were obtained by filtration.

[0105] (2) Put the above-mentioned methionine crystal crude product into the dissolution kettle, add appropriate amount of water and / or crystallization mother liquor to prepare a methionine suspension with a solid content of 11wt%, and add the suspension based on the methionine solut...

Embodiment 2

[0109] The additive of this example is, sodium cocoyl methyl taurate accounts for 2wt%, has the molecular weight that is 6000 and the polyoxyethylene polyoxypropylene ether graft silicone oil of HLB value 12 accounts for 2wt%, dynamic viscosity under 25 ℃ 1500mm 2 / s simethicone oil accounts for 1wt%, and the rest is an aqueous mixture of water.

[0110] (1) In the methionine salt solution obtained by the hydrolysis of 5-(2-methylthioethyl)hydantoin, add an additive based on the methionine salt solution at 150 ppm, and introduce carbon dioxide under stirring , methionine crystals were precipitated in the form of reaction crystallization, and the crude methionine crystals were obtained by filtration.

[0111](2) The above-mentioned methionine crude product is sent in the dissolving kettle, add appropriate amount of water and / or crystallization mother liquor to be mixed with the methionine suspension that solid content is 8wt%, add the solution suspension based on methionine as...

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Abstract

The invention relates to an additive used in a methionine preparation process and a preparation method of methionine. The additive provided by the invention is a mixture containing a component A, a component B and a component C, wherein the component A has a structural formula represented by the following general formula (1), the component B has a structural formula represented by the following general formula (2), the component C is silicone oil, the general formula (1) is RCON(CH3)CH2CH2SO3Na (1), and the general formula (2) is shown in the specification. The preparation method of methionineprovided by the invention comprises the step of carrying out crystallization and / or recrystallization of methionine in the presence of the additive provided by the invention. The additive provided bythe invention is uniform in emulsification, good in stability, capable of being stably used for a long time and suitable for a continuous crystallization process. The prepared methionine is good in crystallization crystal form, high in bulk density and good in flowability. Besides, according to the preparation method of methionine, a crystallization system can continuously and stably operate fora long time, no obvious foaming phenomenon exists, and the crystallization process of the methionine product is stably carried out.

Description

technical field [0001] The present invention relates to an additive used in the crystallization process of methionine and a method of use thereof, in particular to an additive comprising a compound having a defoaming effect and a compound for regulating crystal growth used in the crystallization process and a method for preparing methionine . Background technique [0002] Methionine is one of the essential amino acids for animal growth. It participates in protein synthesis and is the only sulfur-containing amino acid. It is used as a nutritional enhancer for feed to make up for the balance of amino acids. [0003] Currently, methionine is mainly synthesized by chemical methods. According to different routes of raw materials, the synthesis methods mainly include malonate method, acrolein method, or aminolactone method. In contrast, the synthesis route of 5-(2-methylthioethyl)hydantoin is prepared by condensation of hydrocyanic acid and its salts with methylthiopropanal, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C319/28C07C323/58C07C319/26
CPCC07C319/28C07C319/26C07C323/58Y02P60/87C07B2200/13B01D9/0013C12P13/12
Inventor 陈志荣尹红王志轩陈聪张双双王钰
Owner SHANDONG XINHECHENG AMINO ACID
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