Metal salts of a dialkyl ester of 5-sulfoisophthalic acid and method of preparing same

摘要

The claimed invention meets these and other objects by providing a method of preparing a metal salt of a dialkyl ester of 5-sulfoisophthalic acid. Broadly speaking, the method provides for the contacting of a dialkyl ester of 5-sulfoisophthalic acid with a metal cation in a buffered reaction mixture to form the metal salt of the dialkyl ester. The reaction mixture is buffered, at least in part, by the acetate of the metal cation. The method according to invention also encompasses various methods of preparing the dialkyl ester of 5-sulfoisophthalic acid.

主权项

1. A method of preparing a metal salt of a dialkyl ester of 5-sulfoisophthalic acid, the method comprising the steps of:
contacting a dialkyl ester of 5-sulfoisophthalic acid with a metal cation in an aqueous buffered reaction mixture to form the metal salt of said metal cation and said dialkyl ester, wherein said aqueous buffered reaction mixture is buffered by the acetate of said metal cation; and recovering the salt product from the reaction mixture.