Composition of Gasoline from Methanol-to-Propylene and Its Catalytic Cracking to Light Olefins over ZSM-5 Zeolite
1. Research and Development Division, Shenhua Ningxia Coal Industry Group Company Limited, Yinchuan 750411, China;
2. The CNPC Key Laboratory of Catalysis China University of Petroleum, Beijing 102249, China
Abstract：In order to broaden raw materials for ethylene cracking process and reasonably use by-product gasoline resource from methanol to propylene (MTP) technology, the composition of Lurgi MTP gasoline was analyzed in detail. A fixed bed reactor was used to investigate the performance of catalytic cracking of a light fraction with a temperature range of IBP-99 ℃ to light olefins over ZSM-5 catalyst. The results showed that the composition of MTP gasoline present here was characterized by a high content of aromatics and a low content of alkanes, mainly carbon number distribution of C6-C9. Xylene in aromatic group was main composition, with a content of 22.89 %, followed by trimethylbenzene, especially 1,2,4-trimethylbenzene (1,2,4-TMB) with a content of 8.07 %. The composition of MTP gasoline was different from that of traditional gasoline from petroleum. A solution was proposed for the grading utilization of the MTP gasoline. At the reaction conditions of 600 ℃, the maximum propylene yield of the IBP-99 ℃ fraction was up to 30.59%, higher than ethylene yield by 5.82%．At the reaction conditions of 625 ℃, the maximum ethylene yield of the IBP-99 ℃ fraction was up to 31.5%, higher than the propylene yield by 6.13%. The total amount of ethylene and propylene achieved 56.87% at 625 ℃. These results indicate that the light fraction in the MTP gasoline is a good raw material to produce low carbon olefins by catalytic cracking process.
Wang Feng1,Ren Lijun1,Yong Xiaojin1 et al. Composition of Gasoline from Methanol-to-Propylene and Its Catalytic Cracking to Light Olefins over ZSM-5 Zeolite[J]. 化学反应工程与工艺, 2015, 31(1): 1-7.
