Abstract
ABSTRACTP-xylene (PX) is widely used as a raw material of synthesis of terephthalic acid (PTA) and polyester. With the demand of PTA and polyester, PX is demanded eagerly. The process for preparing PX through alkylation of toluene with methanol has been concerned widely. In an experiment HZSM-5/Al2O3 catalyst was prepared by loading pseudoboehmites on HZSM-5. The strength of B acid is adjusted, so side reactions can be controlled effectively. The optimum operating conditions are that molar ratio of toluene to methanol is 2.0, reaction temperature is 410°C, carrier gas flow is 7 mL/min, and WHSV is 1.0 h−1 by investigating the effect of operating conditions on toluene conversion and PX selectivity. Toluene conversion and PX selectivity are up to 46.2% and 68.07%, respectively, under the optimum operating conditions.
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