US 5,312,933 A · Method of producing symmetrical difatty acid diamides

Abstract

The present invention relates to a process of producing symmetrically structured difatty acid diamines by reacting mixtures of fatty acids or their esters with diamines, isolating the symmetrical difatty acid diamides from the reaction mixture by making use of their different solubilities and concentrating them by recrystallisation if necessary. The invention also provides for a process of isolating a fatty acid from a mixture of fatty acids wherein the difatty acid diamides produced in the process of the invention are saponified to yield the corresponding free fatty acid.

Claims18

Dependent claims

A method of producing a symmetrically structured difatty acid diamide or a corresponding pure fatty acid, comprising:

reacting a mixture of fatty acids or their esters with a diamine, to produce a mixture containing a symmetrical difatty acid diamide;
and, separating the symmetrical difatty acid diamide from the resulting reaction mixture by recrystallization or fractured crystallization from methanol or ethanol or by hot vapor extraction with methanol based on differential solubility.

Dependencies are inferred from the claim text.

Method of producing symmetrical difatty acid diamides

Life of this patent

Method of producing symmetrical difatty acid diamides

Life of this patent

Abstract

Claims18