| 摘要 |
An improved process for the production of sulfonated fatty acid alkyl ester surfactants containing low levels of impurities, said process comprising sulfonating fatty acid alkyl esters, and batch neutralizing to a pH of about 5 to about 9 with an alkoxide solution comprising an alkoxide of the formula (RO<->)nM<n+>, a C1 to C8 alcohol, and a buffering agent having a pKa value between about 5 and about 9. A preferred process comprises over-neutralizing to a pH of at least about 10 followed by re-neutralizing to a pH of about 6 to about 8 resulting in a product substantially free of DMS impurity. |
