SELECTIVE HYDROGENATION OF NAPHTHALENES

摘要

1351576 Hydrogenating naphthalenes to tetralins SUMITOMO CHEMICAL CO Ltd 16 June 1972 [19 June 1971] 28420/72 Heading C5E Naphthalene or alkylnaphthalenes are selectively hydrogenated to tetralin or alkyltetralins, respectively, by diluting the (alkyl)- naphthalene feed with an organic diluent which is soluble in the feed and volatile under the hydrogenating conditions and then hydrogenating the diluted feed over a fixed bed of hydrodesulphurization catalyst. Suitable diluents are C 6 -C 9 aromatic hydrocarbons. Hydrogenation may be carried out at 250-330‹ C., 30-60 kg./ cm.2 gauge over a group VI or VIII metal oxide on an alumina or SiO 2 -Al 2 O 3 support as catalyst, which may be pre-sulphided. A suitable ratio of diluent : naphthalene is 3 : 1 to 4 : 1.