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).
