2-甲基-1-丁烯异构为2-甲基-2-丁烯的研究

Isomerization from 2 - Methyl - 1 - Butene to 2 - Methyl -2- Butene

异戊烯是抽余碳五的一种馏分,主要由两种同分异构体2-甲基-2-丁烯(2MB2)和2-甲基-1-丁烯(2MBl)组成,其中,2-甲基-2-丁烯含量越高,应用价值越高。本研究提供了一种提高异戊烯中2-甲基-2-丁烯含量的方法,即在催化剂作用下,在一定的温度、压力和空速下,以液相形式将2-甲基-1-丁烯异构为2-甲基-2-丁烯。最佳反应条件为:反应温度25～55℃,反应空速5～20hr^(-1),反应压力0.6～0.9MPa。在此条件下,异戊烯中的2-甲基-2-丁烯与2-甲基-1-丁烯的比例由原料中的1～4:1提高到10～13:1。

Isoamylene is a component of the C5 refinery streams which contain at least two isoamylene monomers, i. e., 2 - Methyl - 2 - Butene(2MB2) and 2 - Methyl - 1 - Butene(2MB1), 2MB2 is the preferred isomer in most uses. A method is presented for increasing the level of 2 - Methyl - 2 - Butene in isoamylenes involves providing a hydrocarbon stream of isoamylenes including 2MB2 and 2MB! in a ratio of about 1 ~ 4: 1, which is passed in the liquid phase at a temperature and a LHSV which favors isomerization over catalyst to produce a reaction product including 2MB1,2MB2 in a ratio of 1: 10 - 13.