Method for preparation of methionine by ion exchange acidification of methionine salt and special equipment

Abstract

The invention discloses a method for preparation of methionine by weakly acidic cation exchange resin acidification of a methionine salt solution. The acidification reaction temperature is 30-90DEG C, and the reaction pressure is 0.02-0.4MP. The invention discloses equipment for preparation of methionine by acidification of a methionine salt. The equipment consists of a raw material buffer tank, a cleaning agent buffer tank, a regenerant buffer tank, adsorption columns and a circulating pump. The raw material buffer tank, the cleaning agent buffer tank and the regenerant buffer tank are communicated with the adsorption columns respectively through pipelines, the pipelines are equipped with valves for independent control of the communication relation of the raw material buffer tank, the cleaning agent buffer tank, the regenerant buffer tank and the adsorption columns, and the adsorption columns are equipped with reaction product outlets. According to the invention, the cation resin can be reutilized, and high reaction efficiency can be achieved by control of the reaction parameters. In the whole working process of the equipment provided by the invention, adsorption column acidification, cleaning and cation resin regeneration steps can be realized only by controlling the switches.

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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