Distillation: processes – separatory – Plural distillations performed on same material – Including the addition of water or steam
Patent
1980-07-07
1982-04-06
Bascomb, Jr., Wilbur L.
Distillation: processes, separatory
Plural distillations performed on same material
Including the addition of water or steam
203 96, 568750, B01D 336
Patent
active
043234321
ABSTRACT:
A improvement in the process for isolating and recovering meta- and para-cresols from crude cresol-containing compositions composed of cresol components, unreacted cymene components and high-boiling by-products, by distillation in a distillation zone, the characteristic features residing in that:
(i) the unreacted cymene components content in the crude cresol-containing composition is adjusted to 5-25% by weight of said composition after the adjustment, and the water content of said composition is adjusted to become 0.17-1.5 times by weight of the total cresol-components present in the composition, before the crude cresol-containing composition is supplied to the distillation zone, and also in that
(ii) in said distillation zone, the cresol component containing ortho-cresol at a higher concentration than that in the supplied crude cresol-containing composition is distilled off as an azeotropic mixture with the unreacted cymene components and water, whereby the cresol component composed of more condensed meta- and para-cresols being isolated and recovered.
REFERENCES:
patent: 2706708 (1955-04-01), Frank et al.
patent: 2862855 (1958-12-01), Lang et al.
patent: 3337424 (1967-08-01), Neuworth et al.
patent: 3365375 (1968-01-01), Nixon
patent: 3509028 (1970-04-01), Budd et al.
Nakagawa Jun'ichi
Ohtani Yoshitaka
Bascomb, Jr. Wilbur L.
Mitsui Petrochemical Industries Ltd.
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