Distillation: processes – separatory – Convective distillation with normally gaseous medium – e.g. – air
Patent
1978-07-31
1980-04-22
Bascomb, Jr., Wilbur L.
Distillation: processes, separatory
Convective distillation with normally gaseous medium, e.g., air
203 73, 203DIG21, 562600, B01D 334, C07C 5144, C07C 5704
Patent
active
041994108
ABSTRACT:
A process for purifying crude acrylic acid characterized in that high-purity purified acrylic acid containing little or no low boiling aldehydes is obtained by rectifying a crude acrylic acid consisting essentially of acrylic acid and containing low boiling substances such as acetaldehyde, acrolein, water and acetic acid and/or high boiling substances such as maleic acid, phenol, benzaldehyde and acrylic acid dimer, thereby removing said low boiling substances and then high boiling ones, and then stripping trace amounts of remaining low boiling aldehydes with an inert gas such as nitrogen or air at a liquid to gas molar ratio of 2 to 20.
REFERENCES:
patent: 3406100 (1968-10-01), Karafian
patent: 3513632 (1970-05-01), Hess et al.
patent: 3781193 (1973-12-01), Sennewald et al.
patent: 3859175 (1975-01-01), Ohrui et al.
patent: 3932500 (1976-01-01), Duembgen et al.
Abe Tadashi
Ayano Masami
Kato Michio
Kawaguchi Tsunejiro
Ohrui Tetsuya
Bascomb, Jr. Wilbur L.
Sumitomo Chemical Company Limited
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