Method for removal of polymerization inhibitor

Distillation: processes – separatory – Adding material to distilland except water or steam per se – Organic compound

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B01D 334

Patent

active

041441370

ABSTRACT:
The removal of the polymerization inhibitor p benzoquinone from acrylic and methacrylic monomers is effectuated by adding to the inhibited monomers either prior to distillation or during distillation in a distillation zone, sufficient amounts of a monoalkyl substituted hydroquinone, a 2,5-dialkyl substituted hydroquinone or a dihydroxynaphthalene to prevent the benzoquinone from co-distilling with the monomer or to convert the benzoquinone in a distillation zone to a non-volatile compound during the distillation so that the converted benzoquinone returns to the feed flask.

REFERENCES:
patent: 3666794 (1972-05-01), Otsuki et al.
patent: 3674651 (1972-07-01), Otsuki
patent: 3794567 (1974-02-01), Otsuki et al.
patent: 3816267 (1974-06-01), Chuang

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