Recovery process for producing purified methacrylonitrile

Details Recovery process for producing purified methacrylonitrile Recovery process for producing purified methacrylonitrile

1983-06-20

1986-07-08

Bashore, S. Leon

Distillation: processes, separatory

Plural distillations performed on same material

203 14, 203 61, 203 75, 203DIG3, 203DIG19, 203 99, 203 80, 203 78, 558466, B01D 300

Patent

active

045991456

ABSTRACT:
Methacrylonitrile higher in purity than that obtained by the conventional process is efficiently produced by the present improved process for producing purified methacrylonitrile in which the reaction mixture formed by the ammoxidation of isobutylene or tert-butyl alcohol is distilled using water as solvent to obtain a crude methacrylonitrile solution which contains methacrylonitrile as major constituent, methacrolein, hydrogen cyanide, and isobutyronitrile, and the crude methacrylonitrile solution is then purified in a product column, wherein the improvement comprises first removing isobutyronitrile from said crude solution, then feeding the remaining solution to the product column, withdrawing from the top a vapor containing methacrolein, condensing the vapor, returning a greater part of the condensate to the product column while removing the remainder from the distillation system, and withdrawing purified methacrylonitrile from the middle or lower section, preferably from a point lower than the feeding stage.

REFERENCES:
patent: 3196085 (1965-07-01), Dippel
patent: 3445347 (1969-05-01), Borrel et al.
patent: 3507755 (1970-04-01), Bitners et al.
patent: 3862890 (1975-01-01), Piesson et al.
patent: 3936360 (1976-02-01), Chih Wu
patent: 4166008 (1979-08-01), Wu et al.
patent: 4269667 (1981-05-01), Landis
patent: 4294665 (1981-10-01), Issei et al.
patent: 4377444 (1983-03-01), Wu

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