Preparation method of the present invention alkyl fatty monocarboxylic acid alkali metal salt and sodium cocoyl Ise thio net composition of the solution is C 8 -C 22 alkyl C 8 -C 22 fatty acid alkyl fatty acid at a temperature of 60 ℃ ~90 ℃ was filled in the reactor to form onto the first dissolution step of dissolving the C 8 -C 22 alkyl fatty acid, a C 8 -C 22 alkyl fatty acids and C 8 -C 22 alkyl monocarboxylic acid, fatty acid alkali metal salt at an elevated 5 temperature 100 ℃ ~110 ℃ : in the second dissolution step and the temperature 110~115 ℃ dissolving 10 to he to have a weight ratio of 7:10 ratio of addition of C 8 -C 22 alkyl monocarboxylic acid, fatty acid alkali metal salt in a C 8 -C 22 alkyl fatty acid on the solutions to a mixed solution so as to have a weight ratio of 7: C 8 -C 22 alkyl fatty acids and C 8 -C 22 alkyl fatty acid mono, Jun one mixed solution and the sodium coco-carboxylic acid alkali metal salt thiocyanate is formed in the second dissolution step 2: 8 to 3 sodium By adding cocoyl isethionate it consists of forming a homogeneous solution-phase.; Preparation method of the alkyl fatty monocarboxylic acid, an alkali metal salt of the invention and sodium cocoyl Ise thio net composition is the sodium cocoyl isethionate an acid, alkali at an elevated temperature since the ester-type chemical structure of sodium cocoyl isethionate for the improvement thereof is weak due to the hydrolysis can adjust the PH to minimize hydrolysis minimize activity loss minutes and prepared by a simple method.
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