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Separation and regeneration method of catalyst for preparing DL-methionine through catalytic hydrolysis

A catalytic hydrolysis and catalyst technology, applied in the field of methionine production, can solve the problems of high processing cost, difficult catalyst regeneration and recovery, etc., and achieve the effect of high activity, high maintenance cost and optimized separation

Inactive Publication Date: 2021-08-03
CHONGQING UNISPLENDOUR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems mentioned in the background technology, the object of the present invention is to provide a kind of method for preparing methionine, by detecting the content of aminonitrile in the hydrolyzate, judge the deactivation situation of cerium oxide catalyst, and adopt different activation modes to its Carry out regeneration and recovery, which solves the problems of difficult regeneration and recovery of catalysts and high processing costs

Method used

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  • Separation and regeneration method of catalyst for preparing DL-methionine through catalytic hydrolysis

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Experimental program
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Effect test

Embodiment 1

[0026] Pass the ammonium methionine (2-amino-4-methylthioammonium butyrate) hydrolyzate containing solid cerium oxide catalyst into the plate and frame filter, and keep it under the saturation pressure condition of 30°C to realize closed thermo-solid separation , to obtain a wet solid cerium oxide catalyst, the aminonitrile content A in the hydrolyzed solution is ≤0.1%, then the wet solid cerium oxide catalyst is passed through a tank type sedimentation separator for sedimentation separation to obtain the oxidized Cerium catalyst.

Embodiment 2

[0028] Pass the ammonium methionine (2-amino-4-methylthioammonium butyrate) hydrolyzate containing solid cerium oxide catalyst into the belt filter, and keep the temperature at 80°C under saturated pressure to achieve closed thermo-solid separation , to obtain a wet solid cerium oxide catalyst, the aminonitrile content A in the hydrolyzed solution is 0.1%<A≤0.3%, then the wet solid cerium oxide catalyst is washed by solvent beating and then passed into a tower sedimentation separator After sedimentation and separation, the catalyst is passed into a tower scrubber for further countercurrent washing with a solvent, and the activated cerium oxide catalyst is separated and obtained.

Embodiment 3

[0030] Pass the ammonium methionine (2-amino-4-methylthioammonium butyrate) hydrolyzate containing solid cerium oxide catalyst into the centrifuge, keep the temperature at 80°C under saturated pressure conditions to realize closed thermosetting separation, and obtain Wet solid cerium oxide catalyst, the aminonitrile content A in the hydrolyzate is 0.3%<A≤2%, then the wet solid cerium oxide catalyst is washed by solvent beating and then passed into a centrifugal sedimentation separator for sedimentation separation After that, it is passed into the butterfly countercurrent scrubber for further solvent countercurrent washing, and the washed solid cerium oxide catalyst enters the fluidized fluidized bed for regeneration with air. When the regeneration temperature reaches 300 ° C, the regeneration residence time is 10 minutes, and the activated cerium oxide catalyst is obtained. Cerium oxide catalyst.

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Abstract

The invention relates to the field of methionine production, in particular to a method for separating and regenerating a catalyst for preparing DL-methionine through catalytic hydrolysis, which comprises the following steps of: performing thermosetting separation on hydrolysate containing a solid cerium oxide catalyst, determining the activity of the catalyst by measuring the content of aminonitrile in the hydrolysate, and regenerating the catalyst by using different activation regeneration modes according to the activity condition of the catalyst. The activated catalyst is recycled for subsequent production, such that the raw material cost and the energy consumption can be effectively reduced, the service life of the solid catalyst is prolonged, the activity of the regenerated solid catalyst is high, and the yield of the methionine product is maintained at 96% or more after the solid catalyst is repeatedly used for 50 times; the product market competition is improved, more profit is created for companies, and the method has the advantages that the process is simple, the method is suitable for industrial production, the activity of the regenerated solid catalyst is high, the maintenance cost is high, and the treatment cost is low.

Description

technical field [0001] The invention relates to the field of methionine production, in particular to a catalyst separation and regeneration method for catalytic hydrolysis to prepare DL-methionine. Background technique [0002] D, L-methionine, as an amino acid feed additive in feed, is an animal growth promoter, used for protein synthesis, and can improve feed conversion rate, animal growth rate and poultry egg production rate. It can promote the growth of poultry and livestock, increase the amount of lean meat, and shorten the feeding cycle. Animal feed added with methionine can help animals grow rapidly in a short period of time, saving about 40% of feed. [0003] At present, the production methods of D,L-methionine mainly include chemical synthesis, biological fermentation, and enzyme catalysis, among which chemical synthesis is the most common. There are two known chemical synthesis methods. The first one is to directly synthesize 5-(β-methylthioethyl)hydantoin (refer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/92B01J38/02B01J38/48C07C323/58C07C319/28
CPCB01J23/92B01J38/02B01J38/48C07C319/28C07C323/58Y02P20/584
Inventor 郑道敏刘佳陶继强王小权王冬林罗延谷唐大家姚如杰范倩玉柳亚玲刘丹张兰
Owner CHONGQING UNISPLENDOUR CHEM