DE1668473

1,212,716. Alkylating aryl compounds. MITSUBISHI PETROCHEMICAL CO. Ltd. 16 Feb., 1968 [17 Feb., 1967; 28 April, 1967], No. 7784/68. Heading C5E. An alkylation process comprises reacting an aryl compound with a C 5 -C 18 mono-olefin in the presence of HF as catalyst at 0-35‹ C. substantially to complete the reaction, and then, in the presence of HF, subjecting the reaction product to heat treatment at 40-70‹ C. while maintaining the reaction mixture in the liquid phase to give the desired alkylaryl compound, which has a low 2-phenylalkane content. During the heat treatment dialkylated compounds formed as by-products may be converted into mono alkylate by transalkylation. The feedstock may be toluene, xylene or naphthalene but all the examples relate to the alkylation of benzene. A preferred olefin is propylene tetramer. If a separation of the original HF catalyst is carried out after the alkylation fresh HF is added before the heat treatment.