Method and special equipment for preparing methionine employing ion-exchange acidification methionine salt

Abstract

The invention discloses a method for preparing methionine by adopting a weakly acidic cation exchange resin acidification methionine salt solution. The reaction temperature in acidification reaction is 30-90 DEG C, and the reaction pressure is 0.02-0.4MPa. The invention discloses equipment for preparing methionine from an acidification methionine salt. The equipment comprises a raw material buffer tank, a detergent buffer tank, a regenerant buffer tank, an adsorption column and a circulating pump, wherein the raw material buffer tank, the detergent buffer tank and the regenerant buffer tank are respectively communicated with the adsorption column through pipelines; a valve capable of independently controlling the communication relationship among the raw material buffer tank, the detergent buffer tank and the regenerant buffer tank is arranged on each pipeline; and a reactant outlet is formed on the adsorption column. Cationic resin in the method disclosed by the invention can be repeatedly utilized, high reaction efficiency can be achieved by controlling a reaction parameter, and the steps of adsorption column acidification, cleaning and cationic resin regeneration can be achieved just by controlling the switch in the overall working process of the equipment disclosed by the invention.

Description

technical field [0001] The invention belongs to the field of preparation of nitrogen-containing organic compounds, and relates to a new process for preparing methionine, in particular to a method for preparing methionine by acidifying methionine salt. Background technique [0002] Methionine, a sulfur-containing essential α-amino acid, is widely used as a feed additive, food and pharmaceutical additive. At present, the processes for preparing methionine mainly include enzymatic disassembly, microbial fermentation and chemical synthesis; the enzymatic disassembly and microbial fermentation have low yields and high costs, and currently do not have industrial production value. At present, major methionine production companies at home and abroad all use acrolein and methyl mercaptan as raw materials to produce methylmercaptopropionaldehyde, and then condense, hydrolyze, and acidify methylthiolactaldehyde to produce methionine. However, the hydrolysis and acidification routes of ...

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Problems solved by technology

[0006] However, the acidification steps of these several preparation methods all require external acid solution for acidification, but the utilization rate of this external acid solution is often low, resulting in waste of raw materials. In order to avoid this waste, it is usually necessary to set up special equipment to separate and recycle the product , resulting in a substantial increase in production costs and affecting product market competitiveness

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