Process for the preparation of pyrocatechol and hydroquinone

Details Process for the preparation of pyrocatechol and hydroquinone Process for the preparation of pyrocatechol and hydroquinone

1981-08-14

1983-05-03

Sever, Frank

Distillation: processes, separatory

Plural distillations performed on same material

One a distillation under positive pressure or vacuum

203 91, 568752, 568753, B01D 310

Patent

active

043819737

ABSTRACT:
A process for the preparation of pyrocatechol and hydroquinone by reaction of phenol with a peroxidic hydroxylating reagent followed by working-up of the resultant reaction mixture is disclosed. The work-up procedure is carried out in a first rectification column operated under specified conditions and having specified separation stages in a rectification section and a stripping section whereby there is distilled overhead components which boil at a temperature lower than phenol. Taken off from the bottom is a mixture comprising phenol and materials of higher boiling point which are fed into a second rectification column which is also operated under very specified conditions whereby pure phenol is recovered overhead leaving a bottoms comprising phenol pyrocatechol and hydroquinone which are then processed to separate phenol from a mixture of pyrocatechol and hydroquinone.

REFERENCES:
patent: 4308112 (1981-12-01), Jupe et al.

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