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Abstract

A process for the separation of dichlorobenzene mixtures containing m- and p-dichlorobenzene in which: (i) the mixture is as an extracting agent contacted with a phosphoric ester of the general formula (I) as an extracting agent ##STR00001## in which R.sup.1, R.sup.2 and R.sup.3 are identical or different and represent an aliphatic or cycloaliphatic alkyl or alkenyl radical and R.sup.1, R.sup.2, and R.sup.3 together contain at least 3C-atom and not more than 12 C-atoms, or a mixture of different phosphoric esters (I) of formula or is contacted with a phosphine oxide of the general formula (II) as an extracting agent ##STR00002## in which R.sup.1, R.sup.2 and R.sup.3 are identical or different and represent an aliphatic or cycloaliphatic alkyl or alkenyl radical or hydrogen, and R.sup.1, R.sup.2 and R.sup.3 together contain at least 3 C-atoms and not more than 12 C-atoms, or a mixture of different phosphine oxides of formula (II) or a mixture of said phosphoric esters of formula (I) and phosphine oxides of formula (II), and subsequently (ii) the components of the mixture are separated into a m-dichlorobenzene- and a p-dichlorobenzene-containing fraction, and finally (iii) the extracting agent is separated from one of the fractions obtained.

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