| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method of N-long chain acylamino acid salt that can efficiently remove or reduce impurities such as long chain fatty acids, long chain fatty acid salts and so on which are by-products in a usual N-long chain acylamino acid production and difficult to remove. SOLUTION: The production method of a high-purity N-long chain acylamino acid salt comprises a step of adding a basic substance and water to a crude N-long chain acylamino acid containing the impurities such as fatty acids or salts thereof to neutralize the crude acylamino acid to a neutralization degree of at most 1 (0 is not included), a step of adding a hydrophilic organic solvent to the neutralized solution thus obtained and then warming it, a step of dissolving the whole reaction system and then cooling it to precipitate the crystal of the N-long chain acylamino acid salt, and a step of filtrating the precipitated crystal to recover to give the high-purity N-long chain acylamino acid salt having remarkably reduced impurities.
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