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Effect of C6-olefin isomers on pi-complexation for purification of 1-hexene by reactive extractive distillation

机译:C6-烯烃异构体对π络合反应萃取萃取精制1-己烯的影响

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Separation of alpha-olefins from other olefin isomers is a difficult and expensive operation because of the low selectivities encountered.A promising alternative is pi-complexation in combination with extractive distillation:reactive extractive distillation (RED).In this paper,silver nitrate dissolved in ethylene glycol is investigated as a potential reactive solvent for the separation of 1-hexene from a stream containing cis/trans-2-hexene,1 -methylcyclopentene,2-methyl-l-pentene and 1,5-hexadiene typical for a Fischer-Tropsch stream.The solubility of 1,5-hexadiene is increased the most,but of the tested mono-olefins,I -hexene has the highest increase.The results indicate that all olefins form 1:1 (silver:olefin) complexes.In addition,1-hexene also produces 1:2 complexes and 1,5-hexadiene 2:1 complexes.The differences in complexation ability are the consequence of steric hindrance and mainly alter the entropy change of complexation.The 1:1 complexes with mono-olefins therefore exhibit an equal change in enthalpy of complexation (15.6kJ/mol).The obtained selectivities for 1-hexene compared to the tested C6-olefin isomers are:4.94 (trans-2-hexene),1.8 (2-methyl-l-pentene),1.29 (cis-2-hexene),0.9 for 1-methylcyclopentene and 0.37 (1,5-hexadiene).Although technically feasible,it turned out that the developed solvent is industrially not applicable to separate 1-hexene from most of the isomers due to the too low solubility of 1-hexene in the reactive solvent and consequently the too high solvent-to-feed ratio's needed.
机译:由于遇到的低选择性,将α-烯烃与其他烯烃异构体分离是困难且昂贵的操作。一种有前途的替代方法是pi络合与萃取蒸馏:反应萃取蒸馏(RED)。研究了乙二醇作为潜在的反应性溶剂,用于从含有顺式/反式-2-己烯,1-甲基环戊烯,2-甲基-1-戊烯和1,5-己二烯的流中分离1-己烯的典型费-托Tropsch流。1,5-己二烯的溶解度增加最多,但在测试的单烯烃中,I-己烯的溶解度增加最多。结果表明,所有烯烃均形成1:1(银:烯烃)配合物。此外,1-己烯还产生1:2的络合物和1,5-己二烯2:1的络合物。络合能力的差异是位阻的结果,主要改变络合物的熵变。因此烯烃表现出络合焓的变化相等(15.6kJ / mol)。与测试的C6-烯烃异构体相比,1-己烯的选择性为:4.94(反式-2-己烯),1.8(2-甲基-1-戊烯) ,1.29(顺式-2-己烯),1-甲基环戊烯为0.9,0.37(1,5-己二烯)。尽管技术上可行,但事实证明,开发出的溶剂在工业上不适用于将1-己烯与大多数异构体分离由于1-己烯在反应性溶剂中的溶解度太低,因此需要太高的溶剂进料比。

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