吸附法脱除催化轻汽油中碱性氮化物

催化裂化轻汽油醚化工艺是生产清洁汽油的有效途径之一，轻汽油中的碱性氮化物能与醚化催化剂的酸性中心结合从而使醚化催化剂失活。开发了一种采用吸附法脱除催化裂化轻汽油中碱性氮化物的新工艺。考察了吸附剂改性方法和吸附条件对碱性氮脱除率的影响。结果表明，采用吸附法可以高效地脱除催化裂化轻汽油中的碱性氮化物。吸附剂改性处理焙烧温度以240℃为好,改性剂负载量以30%为最佳。采用该改性吸附剂,最佳吸附条件为温度40℃,空速为0.5h-1,压力为0.5MPa,在该条件下处理轻汽油的能力达到751.6g/g。碱性氮的脱出率达85％以上，从而保证催化裂化轻汽油满足醚化催化剂对原料的要求。改性吸附剂具有良好的再生性能,再生后吸附剂处理轻汽油的能力与新鲜吸附剂相当。

Removal of Basic Nitrogen Compounds From Light FCC Gasoline by Adsorption

The etherification process of FCC light gasoline is one of effectively producing clean gasoline processes. A process for removal of basic nitrogen compounds that can deactivate the etherification catalyst from FCC light gasoline by adsorption is studied. The influences of the modification methods of absorbent and the adsorption conditions on the removal of basic nitrogen compounds are investigated. The results indicate: adsorption can effectively remove the basic nitrogen compounds from FCC light gasoline and the adsorptive power of modified adsorbent increases greatly; the calcination temperature of 210 ℃ and the supported amount of 30% are best. Under the optimum conditions, i.e. temperature of 40 ℃, space velocity of 0.5 h-1 and pressure of 0.5 MPa, the ability of modified adsorbent to treat the FCC light gasoline is 751.6　g/g. The removal rate of basic nitrogen compounds in FCC light gasoline is up 85%. Modified adsorbent possesses good reactivity and the capacity of regenerated adsorbent to treat light gasoline is equivalent to that of fresh adsorbent.