Purification and recovery of acetonitrile from waste solvent...

Details Purification and recovery of acetonitrile from waste solvent... Purification and recovery of acetonitrile from waste solvent...

2005-01-18

2005-01-18

Manoharan, Virginia (Department: 1764)

Distillation: processes, separatory

Plural distillations performed on same material

One a distillation under positive pressure or vacuum

C203S079000, C203S080000, C203S092000, C203S093000, C203S094000, C203S096000, C203S097000, C203S098000, C558S441000

Reexamination Certificate

active

06843890

ABSTRACT:
A process of treating waste solvent acetonitrile streams which contain at least one water extractable impurity such as isopropyl acetate to remove substantially all of the impurity by distilling the waste solvent acetonitrile in the presence of water for a time sufficient to allow the water extractable impurity to be extractively distilled from the acetonitrile. In preferred embodiments of the present invention the feed may contain either a mixture of waste solvent acetonitrile and crude acetonitrile or crude acetonitrile free of hydrogen cyanide by itself.

REFERENCES:
patent: 3399120 (1968-08-01), Lovett
patent: 3445347 (1969-05-01), Borrel et al.
patent: 3896007 (1975-07-01), Roscalli et al.
patent: 4119497 (1978-10-01), Ocampo et al.
patent: 4269667 (1981-05-01), Landis
patent: 4308108 (1981-12-01), Higuchi et al.
patent: 4362603 (1982-12-01), Presson et al.
patent: 4377444 (1983-03-01), Wu
patent: 4404064 (1983-09-01), Lovett

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