EIN VERFAHREN ZUR SYNTHESE VON HOCHREINEN P-DIALKYL-BENZENEN MITTELS EINES MITSILIZIUM MODIFIZIERTEN KATALYSATORS SI-HZSM-5.

摘要

A new Si/HZSM-5 catalyst prepd. by the deposition of silicon sediment onto zeolite by decomposition of tetra alkyl orthosilicate. The sediment does not clog the catalyst pores. HZSM-5 catalyst is obtd. by ion exchange of ZSM-5 catalyst and Si deposition is by vapour-phase treatment with Si(OR)4, where R is a 1-4C alkyl gp., esp. ethyl. The deposition is carried out by pulsating type before and during reaction or by continuous type before and during reaction. The monoalkyl benzene is esp. toluene or ethyl benzene, the 1-4C alkene is esp. ethylene and the alkanol is esp. MeOH or EtOH. Conversion is at 200-600 deg.C 15-1000 psia and WHSV of 0.5-100.