Method and installation for separating and purifying...

Details Method and installation for separating and purifying... Method and installation for separating and purifying...

2005-01-18

2005-01-18

Price, Elvis O. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S716000, C568S731000, C568S749000, C568S751000, C568S752000, C568S753000, C568S763000

Reexamination Certificate

active

06844472

ABSTRACT:
A method and installation for separating and purifying a crude mixture containing hydroquinone, resorcinol and possibly tars and/or catechol, comprising the following steps: —a possible distillation stage (I) in order to obtain a catechol head, —the foot (I) or crude mixture undergoes distillation (II) in order to obtain a fraction that is rich in resorcinol, —the foot of (II) undergoes distillation (III) in order to obtain a fraction that is rich in hydroquinone, whereupon said rich fractions are refined (IV or V). Preferably, one or several stages in which tar is removed (I,I′) precede stage (I) or (II).

REFERENCES:
patent: 3969420 (1976-07-01), Suda et al.
patent: 4308110 (1981-12-01), Hosaka et al.
patent: 2 467 185 (1981-04-01), None

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