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三乙醇胺水溶液浓度对HNBR胶液中铑催化剂脱除的影响
（RhCl(PPh3)3中的铑为三配位、一价，外层16个电子，得2个电子达到18电子的稳定结构，HNBR分子结构中含丙烯腈，由于—CN上的N原子可提供孤对电子正好与铑催化剂形成配位化合物，（RhCl(PPh3)3中的铑与HNBR分子链上的—CN有一定的配位作用而不易被脱除。三乙醇胺中的N在氧气的作用下与铑空轨道的配位能力强于HNBR中的—CN，可以将铑从HNBR夺取过来，三乙醇胺与铑配位形成的络合物具有极性，极性决定了这种络合物在水中要比在二甲苯中有更好的溶解性，因此极易溶于水，从而可以将（RhCl(PPh3)3从HNBR胶液中脱除到水相。脱除作用化学反应式：

三乙醇胺同时作为络合剂、萃取剂，其浓度对铑催化剂的脱除意义重大。

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1楼 2010-10-17 18:09:37

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yanghongmei

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wypward(金币+1):谢谢参与 2010-10-20 10:38:26

HNBR triethanolamine aqueous solution by concentration on the removal of rhodium catalyst (RhCl (PPh3) 3 in the three coordinate rhodium, a price of 16 outer electrons have two E-stable structure up to 18 e, HNBR with the molecular structure of PAN, as the N-CN atoms can provide the lone pair electrons coincides with the formation of coordination compounds rhodium catalyst, (RhCl (PPh3) 3 in the Rh and HNBR molecular chain-CN coordination to a certain extent role not easily removed. triethanolamine N in the role of oxygen and rhodium coordination empty orbital is stronger than in the HNBR-CN, can win over rhodium from HNBR, triethanolamine and rhodium coordination network formed polar compounds, polar determine that this complex in water than in a better solubility in xylene, so easily soluble in water, which can be (RhCl (PPh3) 3 glue from HNBR the removal of the aqueous phase. Removal of the role of chemical reaction: triethanolamine as a complexing agent at the same time, extraction solvent, its concentration on the removal of rhodium catalyst is significant.