Process for the separation of long chain amino acids and dibasic acids
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United States of America Patent
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May 15, 2018
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app pub date -
Jul 7, 2017
filing date -
Jun 28, 2017
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Abstract
There is disclosed a process for the separation of long chain amino acid and long chain dibasic acid, comprising: (1) adding water and an extractant solvent to the aqueous suspension of an acid hydrolysis of the mixed amide derivatives to yield an aqueous solution and an extractant phase; (2) separating the mixture of step (1) into an aqueous phase containing the acid salt of long chain amino acid and alkylamine and an extractant phase containing long chain dibasic acid, short chain alkanoic acid, and impurities; (3) neutralizing the aqueous phase of step (2) with a basic agent to obtain a crystalline suspension of the long chain amino acid; (4) recovering the long chain amino acid by solid-liquid separation to yield an aqueous mother liquor; and (5) in the extractant phase of step (2), separating the long chain dibasic acid, short chain alkanoic acid, and impurities.
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