Distillation: processes – separatory – Addition of material to distilland to inhibit or prevent... – For inhibiting or preventing a polymerization reaction
Patent
1975-04-18
1977-05-03
Bascomb, Jr., Wilbur L.
Distillation: processes, separatory
Addition of material to distilland to inhibit or prevent...
For inhibiting or preventing a polymerization reaction
203 49, 260526N, B01D 334, C07C 5704
Patent
active
040213102
ABSTRACT:
A method for inhibiting the polymerization of acrylic acid or acrylic esters during the distillation for separating or purifying the acrylic acid obtained by the vapor phase catalytic oxidation of propylene or acrolein, or the acrylic esters derived from said acrylic acid, said method comprising carrying out the distillation operation in the presence of (A) at least one compound selected from the group consisting of hydroquinone, hydroquinonemonomethyl ether, cresols, phenols, t-butyl catechol, diphenylamine, phenothiazines and methylene blue (B) at least one compound selected from the group consisting of copper dimethyldithiocarbamate, copper diethyldithiocarbamate copper dibutyldithiocarbamate and copper salicylate: and (C) molecular oxygen.
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Kubota Kunihiro
Ohara Takashi
Shimizu Noboru
Yoshida Sadao
Bascomb, Jr. Wilbur L.
Nippon Shokubai Kagaku Kogyo & Co., Ltd.
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