液相氟化催化合成二氟甲烷反应机理及腐蚀性(续完)  

Reaction Mechanism in Liquid Phase Fluorinated CatalyedSynthesizing Difluoromethane and the Corrosivity

作　　者：欧阳豪[1] 贺辉龙 周黎旸 钟依均[1] 

机构地区：[1]浙江师范大学物理化学研究所,浙江金华321004 [2]浙江衢化氟化学有限公司,浙江衢州324004

出　　处：《化工生产与技术》2012年第1期1-3,31,共4页Chemical Production and Technology

摘　　要：阐述了液相氟化催化合成二氟甲烷反应中催化剂、反应温度、反应压力、物料比和HF相态对反应器质材的腐蚀性影响,结合金属的两种腐蚀机理,提出通过添加弱Lewis酸、增大CH2Cl2与HF物料比、使用高耐蚀合金作反应器质材、使用氟聚物作反应器内衬、耦合低温和适宜的压力把HF控制在气相等技术可有效减轻反应器质材腐蚀,并从该反应机理角度指出降低H[SbClxF6-x]配位酸电离出的高活性质子浓度可从根本上解决腐蚀问题。This paper expounded the influence of catalyst,reaction temperature,reaction pressure,the mass ratio of dichloromethane to hydrofluoric acid and the phasestate of HF to the corrosive of reactor materials in the liquid phase fluorinated catalytic synthesizing difluoromethane.Combination of the two kinds of metal corrosion mechanism,several techniques were proposed to reduce reactors corrosion effectively including adding weak Lewis acids,augmenting the mass ratio of dichloromethane to hydrofluoric acid,employing strong corrosion-resisting alloys,using fluoropolymers as the reactor lined,controlling HF in gaseous phase by means of the coupling low temperature and the suitable pressure.Pointed out that reducing highly reactive proton concentration ionized out by coordination acid H[SbClxF6-x] could solve corrosive problems fundamentally from the perspective of reactive mechanism.

关 键 词：液相氟化催化 二氟甲烷 反应机理 质材 腐蚀性 

分 类 号：TQ222.217[化学工程—有机化工]