反应温度对催化汽油窄馏分芳构化的研究

为了使催化裂化(FCC)汽油中烯烃含量满足国家的新标准的要求,需要将汽油中的烯烃转化为异构烷烃和芳烃.以兰炼催化汽油窄馏分为原料,采用小型固定流化床为芳构化反应装置,考察了反应温度对催化汽油窄馏分芳构化产物各组分的增加率、气体产物组成和液体产物组成的影响规律.实验结果表明,对于同一窄馏分,在相同碳数的条件下,随反应温度的升高,各组分的增加率逐渐增加,且反应温度越高,其增加的幅度越大.对于同一种馏分油,随着反应温度的升高,干气、液化气和焦炭产率逐渐增大,而液体产率逐渐减少,芳烃的产率和选择性逐渐增加.在同一温度下,随着馏分变重,干气、液化气和焦炭产率逐渐减少,芳烃、轻油收率和芳烃的选择性逐渐增加,正构烷烃、异构烷烃和烯烃的产率逐渐减少,而芳烃含量迅速增加,环烷烃的含量先增加后变小,存在最大值.

Effect of reaction temperature on the product of aromatization reaction of FCC gasoline narrow fraction

In order to make the content of alkene in FCC gasoline meet the requirements of the national new standard,the alkene in FCC gasoline must be transferred into isobutene and aromatic hydrocarbon.The catalytic gasoline narrow fraction of Lanzhou Refinery being used as experimental material,and small-size fixed-fluidized bed reactor as reaction unit,the effect laws of reaction temperature on the increasing rates and yields of all the components of the product,the composition of gas product and the composition of liquid product of the aromatization reaction are experimentally studied.The experimental results show that,to some narrow fraction,under the same carbon number the increasing rates of all the components of the product increase with the going-up of reaction temperature,and the higher the reaction temperature,the more the increase of the components;to some narrow fraction,the yields of dry gas,with the reaction temperature going up,liquefied gas and coke gradually increase,the yield of the liquid composition of the product decrease and the yield and selectivity of aromatic hydrocarbon increase;at the same reaction temperature,with the gasoline narrow fraction becoming heavy,the yields of dry gas,liquefied gas and coke gradually decrease,the yields of aromatic hydrocarbon and light oil and the selectivity of aromatic hydrocarbon gradually increase,the yields of normal alkane,isoalkane and alkene gradually decrease,the content of aromatic hydrocarbon quickly increases,the content of cycloparaffinic hydrocarbon increases at first and then decreases,and therefore there is a maximum.