Process of purifying methionine

  • US 10,669,233 B2
  • Filed: 03/19/2019
  • Issued: 06/02/2020
  • Est. Priority Date: 12/28/2017
  • Status: Active Grant
First Claim
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1. A process for purifying methionine, wherein methionine is separated from a salt by-product by using a macroporous adsorption resin, in which the methionine is adsorbed onto the macroporous adsorption resin, and then the methionine is recovered by desorbing from the resin using a desorbent;

  • and the salt by-product is not absorbed onto the macroporous adsorption resin during the adsorption process, but enters an effluent resulting from the adsorption, the process comprising the following steps;

    1) flowing a methionine solution comprising methionine and a salt by-product being at least one of sodium carbonate, sodium sulfate, ammonium sulfate, potassium carbonate, ammonium carbonate, or potassium sulfate, or a mixture of two or more thereof, from the top to the bottom, through a macroporous adsorption resin layer, and stopping resin adsorption when the content of methionine in the effluent from the resin column is 1 to 50% (w/w) of the content at the inlet, in which the effluent resulting from the resin adsorption is a salt by-product;

    2) resin desorption;

    desorbing, from the top to the bottom, the resin that has completed the adsorption in step

         1) using a desorbent, and collecting the desorption solution; and

    3) subsequent process;

    subjecting the desorption solution to subsequent treatments following an existing process.

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