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1. (WO2017040583) INHIBITING CPI FORMATION FROM ADIPONITRILE

Pub. No.:    WO/2017/040583    International Application No.:    PCT/US2016/049582
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Sep 01 01:59:59 CEST 2016
IPC: C07C 253/34
C07C 255/04
Applicants: INVISTA NORTH AMERICA S.A R.L.
Inventors: TENN, III, William J.
Title: INHIBITING CPI FORMATION FROM ADIPONITRILE
Abstract:
Disclosed is a method for inhibiting the formation of by-products from dinitriles, such as the formation of cyclopentylideneimine (CPI) from Adiponitrile (ADN), comprising adding an effective amount of a Brønsted acid to the ADN. Also disclosed is a method of refining a dinitrile compound by distillation the method comprising the steps of: (a) supplying (i) a feedstream comprising the dinitrile compound and (ii) a Brønsted acid to a distillation apparatus; and (b) withdrawing from the distillation apparatus an overhead distillate stream comprising the dinitrile compound.