Sumitomo Chemical Company, Limited

Katsumi Kobayashi

Iwao Dohgane

Kenji Tanimoto

Yukimichi Nakao

Hiromichi Okabe

Diisopropylbenzene monohydroperoxide which is usable for the oxidation of diisopropylbenzene without prevention of the oxidation, is recovered from an oxidation product solution of diisopropylbenzene by steam-distilling the oxidation product solution at pH 6 to 9 and at a solution temperature of 80.degree. to 130.degree. C under a reduced pressure.

Method for recovering hydroperoxide

A process for producing alkylnaphthalenes by alkylating naphthalene with an olefin having 2 to 4 carbon atoms, which comprises (1) introducing the olefin into a solution of crude naphthalene containing thianaphthene as an impurity in a solvent having a boiling point sufficiently different from the boiling point of the naphthalene and alkylnaphthalenes produced that the solvent is separable by distillation in the presence of (i) an aluminum chloride complex consisting of (a) aluminum chloride, (b) hydrogen chloride and (c) an alkylated benzene or naphthalene, or (ii) a solid aluminum chloride which is dissolved into the reaction solution by adding gaseous hydrogen chloride simultaneously with or prior to the introducing of the olefin, (2) aging the reaction solution, and (3) recovering the resulting alkylnaphthalenes, whereby alkylnaphthalenes, containing as monoalkylnaphthalenes a predominant amount of a .beta.-monoalkylnaphthalene, are obtained in a high yield.

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Minoo, Japan

Katsumi Kobayashi