Process of isolation of (Meth) acrylic acid

Details Process of isolation of (Meth) acrylic acid Process of isolation of (Meth) acrylic acid

1997-07-29

1999-01-05

Manoharan, Virginia

Distillation: processes, separatory

Plural distillations performed on same material

One a distillation under positive pressure or vacuum

203 80, 203100, 203DIG9, 203DIG21, 562600, B01D 300, C07C 5144

Patent

active

058557431

ABSTRACT:
A process is provided for the isolation of (meth)acrylic acid from a mixture containing (meth)acrylic acid as the main component and lower aldehydes as secondary components by rectification in a rectification column having a stripping section and a rectification section, wherein the starting mixture containing the (meth)acrylic acid to be isolated by rectification is not fed directly to the rectification column but is first passed into a heated dwell vessel which is connected to the vapor side of the rectification section of the rectification column and in which the starting mixture is kept at the boil and, instead of the starting mixture as such, the bottom liquid of the dwell vessel is fed to the rectification column.

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