二甲醚经低碳烯烃合成汽油组分正辛烷、对二甲苯热力学分析  

Thermodynamic analysis for DME conversion to n-octane and p-xylene of gasoline via light olefins

作　　者：户倩倩[1,2] 谭猗生[1] 韩怡卓[1] 满建明[1,2] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院研究生院,北京100039

出　　处：《天然气化工—C1化学与化工》2010年第1期1-5,12,共6页Natural Gas Chemical Industry

基　　金：中国科学院知识创新工程重要方向项目(KGCX2-YW-318-2)

摘　　要：采用原子矩阵法确定了二甲醚经低碳烯烃制正辛烷和对二甲苯的独立反应数,并通过建立平衡关系,采用文献介绍方法,计算了各个反应的反应热、平衡常数及反应平衡时的平衡组分浓度。经分析表明,反应属放热反应;模型中绝大多数反应能自发进行,并且平衡转化率较高;低温高压有利于正辛烷的生成,而低温低压有利于对二甲苯的生成;丙烯生成正辛烷和对二甲苯的转化率远高于乙烯和丁烯,因此控制中间产物丙烯的含量有利于控制目的产物的产出。The number of independent reactions of dimethyl ether （DME） to n-octane and p-xylene via light olefins was obtained by atomic matrix method. Reactions heat, equilibrium constants, equilibrium relationships among the produets of all those reactions were calculated through building equilibrium relationships with the methods from literatures. The results show that most of the reac- tions are exothermic reactions. Most of the reactions in models could proceed spontaneously with high equilibrium conversion. Low temperature and high pressure are beneficial to improve the yield of n-octane, but low temperature and low pressure are beneficial to improve the yield of p-xylene; conversion rates of propylene to n-octane and p-xylene were higher than that to ethane and butylene. The product yield could be improved through controlling the content of propylene.

关 键 词：二甲醚制低碳烯烃 低碳烯烃制汽油 热力学计算 正辛烷 对二甲苯 平衡组成 

分 类 号：TQ013.1[化学工程]