| Cr-Zn-Al催化剂气相氟化法合成HFC-134a |
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| 引用本文： | 董洪涛,陈纪忠. Cr-Zn-Al催化剂气相氟化法合成HFC-134a[J]. 精细化工, 2006, 23(2): 138-140 |
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| 作者姓名： | 董洪涛 陈纪忠 |
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| 作者单位： | 浙江大学,联合化学反应工程研究所,浙江,杭州,310027;浙江大学,联合化学反应工程研究所,浙江,杭州,310027 |
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| 摘 要： | 用共沉淀法制备了Cr-Zn-A l型催化剂,用于催化1,1,1-三氟-2-氯乙烷(HCFC-133 a)与HF的反应,制备了1,1,1,2-四氟乙烷(HFC-134 a)。BET法表征了催化剂的比表面积;GC-MS方法分析了不同反应条件下HCFC-133 a的转化率、HFC-134 a的收率、以及副产物组成。结果表明,催化剂按一定程序烧结、活化后,反应温度为350~370℃、n(HF)/n(HCFC-133 a)=8~12时,HFC-134 a的收率为30%~38%,反应产物中HFC-134 a的选择性大于99%。连续反应720 h后,催化剂的活性不变。
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| 关 键 词： | 1 2-四氟乙烷 气相氟化 氟氯交换反应 Cr-Zn-Al复合催化剂 |
| 文章编号： | 1003-5214（2006）02-0138-03 |
| 收稿时间： | 2005-07-25 |
| 修稿时间： | 2005-07-252005-10-11 |
Cr-Zn-Al Catalyst for Synthesizing HFC-134a by Gas Phase Fluorination |
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| DONG Hong-tao,CHEN Ji-zhong. Cr-Zn-Al Catalyst for Synthesizing HFC-134a by Gas Phase Fluorination[J]. Fine Chemicals, 2006, 23(2): 138-140 |
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| Authors: | DONG Hong-tao CHEN Ji-zhong |
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| Affiliation: | UNILAB Research Center of Chemical Reaction Engineering ,Zhejiang University,Hangzhou ,310027, Zhejiang, China |
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| Abstract: | Co-precipitation technique is employed to prepare a Cr-Zn-Al catalyst,whereby 1,1,1-trifluoro-2-chloroethane(HCFC-133a) reacted with HF to synthesize 1,1,1,2-tetrafluoroethane(HFC-134a).BET nitrogen absorption method is used to analyze surface area of the catalyst.GC-MS is employed to investigate conversion of HCFC-133a,selectivity for HFC-134a and composition of by-products under various conditions.The results show that the Cr-Zn-Al catalyst,after programmed sintering and activating steps,exhibits high catalytic activity:high yield of HFC-134a(30%～38%) and superior selectivity for HFC-134a(above 99%) when the temperature is set between 350 ℃ and 370 ℃ and mole ratio of HF to HCFC-133a ranges from 8 to 12.The original catalytic activity remains unchanged after 720 hour reaction. |
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| Keywords: | 1,1,1,2-tetrafluoethane gas phase fluorination exchange chloride for fluoride Cr-Zn-Al catalyst |
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