Recovery and purification of olefinic nitriles

Details Recovery and purification of olefinic nitriles Recovery and purification of olefinic nitriles

1975-01-13

1983-03-22

Sever, Frank

Distillation: processes, separatory

Including addition of water or steam

To distillation column

203DIG3, 203DIG19, 2604653, 2604659, B01D 334

Patent

active

043774440

ABSTRACT:
A process is described for the recovery and purification of an olefinic nitrile, such as methacrylonitrile, from mixtures of said olefinic nitrile with hydrogen cyanide, acetonitrile, acrylonitrile, and carbonyl compounds, which result from the ammoxidation of an olefin, such as isobutylene. The mixtures of olefinic nitrile are fed to an extractive distillation column at a point above the middle of the column, a vapor sidestream is removed at a point below the middle of the extractive distillation column said sidestream containing substantially all of the hydrogen cyanide, acetonitrile and carbonyl compounds and then concentrating the hydrogen cyanide, acetonitrile and carbonyl compounds in a stripping pot.

REFERENCES:
patent: 3080301 (1963-03-01), Fontana et al.
patent: 3196085 (1965-07-01), Dippel
patent: 3264197 (1966-08-01), Schonbeck et al.
patent: 3399120 (1968-08-01), Lovett
patent: 3507755 (1970-04-01), Bitners et al.
patent: 3535849 (1970-10-01), Hausweiler et al.

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