二段多产丙烯试验轻汽油转化不充分的原因  

Reasons for inadequate conversion of light gasoline in two-stage maximizing propylene experiment

作　　者：徐占武[1,2] 李春义[3] 王艳菊 杨朝合[3] 李鑫钢[1] 隋红[1] 

机构地区：[1]天津大学化工学院精馏技术国家工程研究中心,天津300072 [2]中国石油大庆炼化分公司,黑龙江大庆163411 [3]中国石油大学重质油国家重点实验室,山东东营257061

出　　处：《化学工程》2008年第10期71-74,共4页Chemical Engineering(China)

摘　　要：在重油二段提升管催化裂解多产丙烯(TMP)技术中,回炼富含烯烃的轻汽油可进一步增产丙烯。实验室研究表明,回炼占新鲜原料19%的轻汽油,丙烯收率即可增加5%以上,而干气增加不到1%。而在工业试验中回炼占新鲜原料21.88%的轻汽油对丙烯和干气的贡献分别为1.51%和1.37%。其原因在于回炼的轻汽油高速喷入本身造成的催化剂稀相区和重油进料造成的催化剂稀相区,导致以分子形式分散的轻汽油与催化剂不能充分接触、吸附和发生催化转化,并因催化剂流化密度低而不能及时终止未能吸附的轻汽油分子发生热裂化反应,因而丙烯的贡献低而对干气的贡献高。Recycling the olefin-rich light gasoline can further increase the yield of propylene in the two-stage riser catalytic cracking of heavy oil for maximizing propylene （TMP） process which is a new technology of producing propylene with heavy oil as the feed. The experimental results show that if the recycled light gasoline accounting for 19% of the fresh heavy oil feed, the yields of propylene can increase by more than 5% , while the dry gas less than 1%. But in the commercial tests, if the recycled light gasoline accounting for 21.88% of the fresh feed, the propylene yield can only increase by 1.51% while the dry gas 1.37%. The main reasons are that the dilute domain of the catalyst created by the recycled light gasoline and heavy oil injected at a high velocity leads to inadequate contact, adsorption and catalytic conversion between the light gasoline and the catalyst; and low fluid density of the catalyst can not promptly terminate the thermal cracking caused by the light gasoline unadsorbed, thus causing a lower yield of propylene but higher yield of dry gas.

关 键 词：TMP技术 丙烯 轻汽油回炼 催化裂解 

分 类 号：TE624.41[石油与天然气工程—油气加工工程]