Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1995-07-28
1999-06-08
Killos, Paul J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562545, C07C 5121, C07C 51235
Patent
active
059106077
ABSTRACT:
In a process for producing acrylic acid, wherein propylene and/or acrolein is catalytically oxidized with molecular oxygen in a vapor phase and the gas resulting from the oxidation is cooled and/or absorbed in water to form a crude aqueous acrylic acid, followed by azeotropic distillation to remove the water with an entrainer of a boiling point of no higher than 130.degree. C. on the crude aqueous acrylic acid which may have, upon necessity, undergone removal of aldehydes contained therein to produce acrylic acid purified in that the crude aqueous acrylic acid is substantially dehydrated, the improvement which comprises conducting the azeotropic distillation under such conditions that concentrations of the entrainer and water in the bottom product of the azeotropic distillation are from 5% to 30% by weight and no higher than 0.5% by weight, respectively, where the theoretical number of plates in the azeotropic distillation column for dehydration used and that in the distillation column for separating acetic acid used are preferably from 5 to 20. Highly-purified acrylic acid can thus be obtained from the crude aqueous acrylic acid without causing unfavorable polymerization of acrylic acid.
REFERENCES:
patent: 3689541 (1972-09-01), Sennewald et al.
patent: 3781193 (1973-12-01), Sennewald et al.
patent: 3844903 (1974-10-01), Willersinn et al.
patent: 4317926 (1982-03-01), Sato et al.
patent: 5315037 (1994-05-01), Sakamoto et al.
Hosaka Hirochika
Sakakura Yasuyuki
Yamagishi Masahiko
Keys Rosalynd
Killos Paul J.
Mitsubishi Chemical Corp.
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