偏三甲苯异构化制均三甲苯用Ag改性HZSM-5催化剂性能  

Performance of Ag modified HZSM-5 catalyst for isomerization of1,2,4-trimethylbenzene to 1,3,5-trimethylbenzene

作　　者：王福善 杨俊明[1] 张霖[1] 张昊 梁琨 WANG Fu-shan;YANG Jun-ming;ZHANG Lin;ZHANG Hao;LIANG Kun(Lanzhou Petrochemical Company,PetroChina,Lanzhou 730060,China;College of Chemistry and Chemical Engineering,Lanzhou University,Lanzhou 730000,China;National and Local Joint Engineering Laboratory of Nonferrous Metal Chemical Catalysts,Lanzhou 730000,China)

机构地区：[1]中国石油兰州石化公司,甘肃兰州730060 [2]兰州大学化学化工学院,甘肃兰州730000 [3]有色金属催化剂国家地方联合工程实验室,甘肃兰州730000

出　　处：《石化技术与应用》2023年第6期433-436,464,共5页Petrochemical Technology & Application

摘　　要：在偏三甲苯异构化制均三甲苯反应中,以理想三甲苯混合系统为模型,通过热力学计算,得到混合三甲苯体系在不同反应温度下的平衡组成,以及偏三甲苯异构化反应温度区间内偏三甲苯转化率、均三甲苯选择性及其收率;在此基础上,对HZSM-5催化剂进行Ag金属改性,在加压固定床上评价其对偏三甲苯异构化的催化性能,并对反应温度、反应压力、质量空速等工艺条件进行优化。结果表明:在混合三甲苯的平均热力学平衡组成中,n(连三甲苯)∶n(偏三甲苯)∶n(均三甲苯)为0.052∶0.674∶0.274;在异构化反应温度区间内,偏三甲苯的转化率为32.6%,均三甲苯的选择性、收率分别为75.6%,27.4%;在反应温度280℃、反应压力1.6 MPa、质量空速1.0 h-1、Ag加入质量分数1%、氢油摩尔比为5的优化反应条件下,偏三甲苯的转化率为33.80%,均三甲苯的选择性为71.34%,均三甲苯单程收率最高可达24.90%。Using an ideal trimethylbenzene mixture system as a model in the isomerization of 1,2,4-trimethylbenzene to 1,3,5-trimethylbenzene,the thermodynamic equilibrium composition of mixed trimethylbenzene at different temperatures and the conversion rate of 1,2,4-trimethylbenzene,the selectivity and yield of 1,3,5-trimethylbenzene within the reaction temperature range were obtained through the thermodynamic calculations.The isomerization reaction was carried out by HZSM-5 catalyst modified with Ag and its performance for the isomerization was evaluated in a pressurized fixed bed reactor.The process conditions of reaction temperature,reaction pressure,mass space velocity,and Ag addition mass fraction were optimized.The results showed that n(1,2,3-trimethylbenzene)∶n(1,2,4-trimethylbenzene)∶n(1,3,5-trimethylbenzene)was 0.052∶0.674∶0.274 in the average thermodynamic equilibrium composition of mixed trimethylbenzene.The conversion rate of 1,2,4-trimethylbenzene was 32.6%,the selectivity and yield of 1,3,5-trimethylbenzene were 75.6%and 27.4%respectively within the reaction temperature range.The conversion rate of 1,2,4-trimethylbenzene was 33.80%,and the selectivity of 1,3,5-trimethylbenzene was 71.34%,and the highest one-way yield of 1,3,5-trimethylbenzene could reach 24.90%under the optimized conditions of the reaction temperature at 280℃,the reaction pressure at 1.6 MPa,and the mass space velocity at 1.0 h-1,Ag addition mass fraction at 1%,and the molar ratio of hydrogen to oil at 5.

关 键 词：HZSM-5催化剂 异构化 Ag改性 偏三甲苯 均三甲苯 转化率 选择性 收率 

分 类 号：TQ426.99[化学工程] TQ241