Abstract
Publisher Summary This chapter discusses highly selective isopropylation of xylenes catalyzed by zeolite Beta. The isopropylation of xylenes to form corresponding dimethyl cumenes was carried out with isopropanol over large-pore high-silica zeolite H-beta as catalyst under continuous vapor-phase fixed bed down flow-glass reactor system at atmospheric pressure and moderate temperatures (413K to 453K). Zeolite H-Beta exhibited quite high activity, selectivity, and stability. The effect of reaction temperature, space velocity, substrate to alkylating agent molar ratio, and time-on-stream on conversion and selectivity was studied. As high as 90–99% selectivity for dimethylcumenes was obtained in relatively lower reaction temperature range of 413–433 K at quite high xylene conversion (80–90% of theoretical value).
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