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    • 47. 发明授权
    • Method for separation of isobutylene from C.sub.4 hydrocarbon fractions
    • 从C(HD 4 {B烃馏分)分离异丁烯的方法
    • US4012456A
    • 1977-03-15
    • US525113
    • 1974-11-19
    • Donat Nikolaevich Chaplits
    • Donat Nikolaevich Chaplits
    • C07C7/148C07C11/08
    • C07C7/14866
    • The method for separation of isobutylene from hydrocarbon fractions containing four carbon atoms consists in processing said hydrocarbon fractions with water at a temperature of 70.degree.-110.degree. C and a pressure of 16 - 23 atmospheres, at a molar ratio of the said hydrocarbon fractions to water of 1:5-20, in the presence of a polar solvent taken in the quantity of 10-70 per cent of the weight of water, and also in the presence of a catalyst. The resultant reaction mixture contains tertiary butyl alcohol and water. Tertiary butyl alcohol is isolated from the reaction mixture as its aqueous solution and is dehydrated at a temperature of 80.degree.-110.degree. C and a pressure not above 3 atm, in the presence of the same catalyst. The catalyst, that is used at the stage of processing the hydrocarbon fractions with water, and also at the step of dehydration of tertiary butyl alcohol, is a moulded ion-exchange catalyst consisting of a sulphonated copolymer of styrene with divinylbenzene or diisopropenylbenzene, and a sulphonated thermoplastic material, for example, sulfonated-polyethylene, -polypropylene and -polyvinyl chloride, taken in the weight ratio of 1-4:1-2, of sulfonated styrene-dialkenylbenzene copolymer:sulfonated thermoplastic material, respectively.
    • 用于从含有四个碳原子的烃馏分中分离异丁烯的方法包括在70-110℃的温度和16-23个大气压的压力下以所述烃馏分与 水为1:5-20,在极性溶剂存在下,以水的重量百分之十至七十七的比例,以及催化剂存在下进行。 所得反应混合物含有叔丁醇和水。 叔丁醇作为其水溶液从反应混合物中分离,并在相同催化剂存在下,在80-110℃的温度和不高于3atm的压力下脱水。 在用水处理烃馏分的阶段以及在叔丁醇脱水的步骤中使用的催化剂是由苯乙烯与二乙烯基苯或二异丙烯基苯的磺化共聚物组成的模制离子交换催化剂,和 分别以磺化苯乙烯 - 二烯基苯共聚物:磺化热塑性材料的磺化聚乙烯,聚丙烯和聚氯乙烯,其重量比为1-4:1-2的磺化热塑性材料。