Distillation: processes – separatory – With chemical reaction – Including step of adding catalyst or reacting material
Patent
1979-03-22
1981-03-24
Bascomb, Jr., Wilbur L.
Distillation: processes, separatory
With chemical reaction
Including step of adding catalyst or reacting material
203 33, 203 34, 203 38, 203 43, 203 91, 260396R, B01D 310, C07C 5000
Patent
active
042578515
ABSTRACT:
A crude naphthoquinone produced by an oxidation of naphthalene is purified by a reduced pressure distillation of a crude 1,4-naphthoquinone having an acid content of less than 5 equivalent % calculated as monobasic acid and the crude naphthoquinone is preferably treated by an oxidation of oxidizable impurities.
REFERENCES:
patent: 2536833 (1951-01-01), Bailey
patent: 2779722 (1957-01-01), Murray et al.
patent: 3441576 (1969-04-01), Berndtsson
Chem. Abstracts 66 (1967) 2309k.
Chem. Abstracts 60 (1964) 1662d.
Bandow Kowzo
Matsuura Ryo
Sakai Kazuaki
Sato Tuneyasu
Yamada Yorinobu
Bascomb, Jr. Wilbur L.
Kawasaki Kasei Chemicals Ltd.
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