SnCl_4改性树脂催化合成聚甲氧基二甲醚  

Synthesis of polyoxymethylene dimethyl ethers over SnCl_4 modified cation-exchange resin catalysts

作　　者：刘小兵[1] 庄志海[1] 张建强[1] 刘殿华[1] 房鼎业[1] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室大型工业反应器工程教育部工程研究中心,上海200237

出　　处：《天然气化工—C1化学与化工》2015年第5期14-18,61,共6页Natural Gas Chemical Industry

摘　　要：制备了系列用于以甲醇、甲醛和多聚甲醛为原料合成聚甲氧基二甲醚(PODEn)的Sn Cl4改性大孔阳离子交换树脂催化剂,并用EDS、FT-IR和NH3-TPD方法对其进行了表征。研究了制备条件对催化剂性能的影响和反应条件对PODEn合成过程的影响。结果表明:在浸渍时间3h,浸渍温度75°C和Sn Cl4浸渍溶液量12m L的条件下,Sn Cl4改性催化剂催化效果最佳;Sn Cl4改性催化剂酸强度降低,酸性中心数量有所增加;采用效果最佳的催化剂,在最佳反应条件70°C、1.0MPa、质量空速1.0h-1和原料物质的量比n(CH2O):n(CH4O)=2.5:1下,甲醇转化率和目标产物PODE3-5选择性分别为41.10%和29.74%。A series of SnCh modified cation-exchange resin catalysts for synthesis of polyoxymethylene dimethyl ethers （PODE,） from methanol, formaldehyde and paraformaldehyde were prepared, and characterized by EDS, FT-IR and NH3-TPD. The effects of preparation conditions on catalyst performances and the effects of reaction conditions on PODE. synthesis were investigated. Results showed that the optimal SnCl4 modified cation-exchange resin catalyst was prepared by using a impregnating time of 3h, a impregnating temperature of 75℃ and a dose of SnC[4 impregnating solution of 12mL; modification by SnC14 could decrease acid strength of the catalyst, but increase the number of strong acid sites on the catalyst; over the optimal catalyst, under the optimal reaction condition, 70℃, 1.0MPa, WHSV of 1.0h1 and feedstock n（CH20）/n（CH3OH） of 2.5, the conversion of methanol and the selectivity to PODE3.5 were 41.1% and 29.74%, respectively.

关 键 词：聚甲氧基二甲醚 PODEn 合成 SnCl4改性阳离子交换树脂 甲醇 甲醛 多聚甲醛 柴油添加剂 

分 类 号：TQ223.24[化学工程—有机化工] TQ032