C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/234, 202/70,
C08G 69/26 (2006.01) B01D 3/32 (2006.01) C08G 69/28 (2006.01)
Patent
CA 1186339
ABSTRACT OF THE DISCLOSURE The efficiency of a rectifying zone for the recovery of diamine vapor from waler vapor being separated from a reaction zone in which a polyamide- forming salt is being heated to form a prepolymer is improved by adding a dicarboxylic acid to the reflux water at the top of the rectifying zone.
397565
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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