高选择性加氢异构降凝催化剂的研发及性能评价

DEVELOPMENT AND PERFORMANCE EVALUATION OF HYDROISOMERIZATION CATALYST WITH HIGH SELECTIVITY

针对直链烷烃异构反应过程的特点,开发了一种新加氢异构降凝催化剂。该催化剂采用新特制酸性分子筛以促进反应物分子接近反应位及异构中间产物快速脱离反应位。物化性质表征结果表明,与对比分子筛和催化剂相比,新分子筛和催化剂具有更大的孔体积和孔径以及更弱的酸性。以实际油品(加氢裂化尾油及费-托合成精制蜡)为原料的中试评价结果表明,与对比催化剂相比,采用新催化剂可获得更高的目标产品收率和黏度指数,且能适应不同的原料油。特别是加工费-托合成精制蜡时,新催化剂的活性和异构选择性优势更为明显。

According to the reaction mechanism of n-paraffin hydroisomerization,a new hydroisomerization catalyst was developed for the isomerization of linear alkanes.The catalyst used a special acidic component to promote the reaction molecules to approach the reaction active site and the isomerization of intermediate products to quickly detach from the reaction active site.The results of physical and chemical properties characterization revealed that the new molecular sieves and catalysts had larger pore volume,larger pore diameter and weaker acidity than the contrast molecular sieves and catalysts.The results of the evaluation experiments using two types of industrial hydrocracking tale oil and F-T wax as the feeds showed that using new catalyst could get higher target product yield and less loss of viscosity index than the contrast catalyst,and it could adapt to different raw feed oil.Specially,the activity and isomerization selectivity of the new catalyst were higher when F-T wax was the feed.