活性炭负载金属氯化物催化1-氯-1,1-二氟乙烷裂解制备偏氟乙烯  

Catalytic Effect of Active Carbon Supported Metal Chloride on the Pyrolysis 1-Chloro-1,1-Difluoroethane to Vinylidene Fluoride

作　　者：王刚[1] 郑海峰[1] 尹红[1] 袁慎峰[1] 陈志荣[1] Wang Gang;Zheng Haifeng;Yin Hong;Yuan Shenfeng;Chen Zhirong(College of Chemical and Biological Engineering, Hang Zhou, Zhejiang University, 310027, China)

机构地区：[1]浙江大学化学工程与生物工程学院,浙江杭州310027

出　　处：《化学反应工程与工艺》2016年第1期73-77,共5页Chemical Reaction Engineering and Technology

基　　金：浙江省重点科技创新团队计划资助(2011R50007)

摘　　要：在裂解温度为400～630 ℃、空时为32 s 条件下研究了活性炭负载金属氯化物催化剂（FeCl3/C、CuCl2/C和NiCl2/C）催化1-氯-1,1-二氟乙烷（HCFC-142b）裂解制备偏氟乙烯（VDF）的过程。考察了反应温度和催化剂种类对原料转化率和VDF 含量及选择性的影响。结果表明：FeCl3/C 和CuCl2/C 的催化活性较高，NiCl2/C无明显催化作用。反应温度为400～500 ℃时，FeCl3/C 使HCFC-142b 转化率提高约10%～20%，VDF 含量增加约3%～8%，选择性下降约10%～14%。反应温度为400～480℃时，CuCl2/C 使HCFC-142b 转化率和VDF 含量提高50%以上，选择性也明显提高。推测FeCl3/C 和CuCl2/C 的催化机理为碳正离子机理。Studies on catalytic pyrolysis of 1-chloro-1,1-difluoroethane (HCFC-142b) to vinylidene fluoride(VDF) by FeCl3/C, CuCl2/C and NiCl2/C were carried out under 400-630 ℃ and space time 32 s. Theeffects of temperature, carrier and catalyst on conversion of HCFC-142b, the content and selectivity of VDFwere investigated. The results showed that FeCl3/C and CuCl2/C had good performance on reaction whileNiCl2/C had little effect. The conversion of HCFC-142 and the content of VDF can be enhanced by 10%-20%and 3%-8% respectively, while the selectivity of VDF was reduced by 10% -14% when the reaction wascatalyzed by FeCl3/C under 400-500 ℃. The conversion of HCFC-142 and the content of VDF can beenhanced above 50% when the reaction was catalyzed by CuCl2/C under 400-480 ℃. The selectivity hasalso been improved greatly. Carbenium ions mechanism was induced when FeCl3/C and CuCl2/C were usedas catalysts.

关 键 词：1-氯-1 1-二氟乙烷偏氟乙烯裂解 催化机理 

分 类 号：TQ031.3[化学工程]