N-olefin skeletal isomerization process (N-OLEFIN SKELETAL ISOMERIZATION PROCESS)

摘要

The present invention relates to a process for the preparation of zeolites of intermediate pore size, for example zeolites, such as ZSM-22, ZSM-23 and ZSM-35, on a catalyst containing a linear olefin with an iso-olefin such as n-butene with isobutylene Wherein the zeolite is pretreated with a dicarboxylic acid, e. G., Oxalic acid. This pretreatment significantly reduces the aging rate of the catalyst and significantly increases the cycle length.