裂解碳五馏分选择加氢催化剂的研究

对裂解碳五馏分中双烯烃选择加氢为单烯烃的工艺及其催化剂进行了研究。采用鼓泡床反应器对制备的镍系催化剂进行了评价,考察了反应压力、液态空速、氢气与双烯烃的摩尔比和入口温度对镍系催化剂选择加氢性能的影响。实验结果表明,在入口温度为常温、反应压力1.5～3.0MPa、氢气与双烯烃的摩尔比1.5～1.9、液态空速2～4 h~(-1)、返回物料与新鲜物料的体积比为3的工艺条件下,加氢后物料中双烯烃的质量分数小于0.5%,双烯烃的转化率大于98%,单烯烃的选择性大于90%。经过1 000 h的催化剂稳定性实验考核表明,制备的镍系催化剂具有良好的稳定性;经加速失活后,再生后催化剂的性能基本恢复。

Catalyst for Selective Hydrogenation of C_5 Fraction from Steam Cracking

For the sake of producing propylene and ethylene from steam cracking C_5 fraction, diolefins in C_5 fraction should be selectively hydrogenated to monoolefins in advance. The nickel catalyst used in the selective hydrogenation was prepared by isochoric impregnation and was evaluated in a bubbling-bed reactor. Effects of inlet temperature, reaction pressure, LHSV and mole ratio of hydrogen to diolefins On the selective hydrogenation were investigated. Under optimal conditions: ambient inlet temperature; pressure 1.5 - 3.0 Mpa, mole ratio of hydrogen to diolefins 1.5 - 1.9, LHSV 2 - 4 h~(-1) and volume ratio of recycled feedstock to fresh feedstock 3, the mass fraction of diolefins in the products was less than 0.5%, conversion of diolefines was more than 98% and the selectivity to monoolefins was more than 90%. The prepared catalyst is good in stability. After accelerated deactivation, the activity of regenerated catalyst can be basically recovered.