Production of propylene by dehydration and Skeletal isomerization of isobutanol on simultaneous metathesis followed by acid Catalysts

摘要

1. Propylene production process: in the first stage, isobutylene glycol must be removed at the same time to desulfurize and isomerize the skeleton, so as to produce basically related oil plants, which have the same carbon number and are mainly composed of a mixture of n-butadiene and so buteno; In the second stage, n-butadiene will receive metabism of isobutylene, including (a) introducing a recipe in the reactor, including isobutylene glycol, optional water, inert ingredients,(b) This current is connected to a catalyst in the reactor, so that it can effectively remove and isomerize at least part of the skeleton of isobutanol, thus producing a mixture of nbutenes and ISO buteno, (c) recovering a recipe (b) from the reactor,To remove water, silicon inert components and isobutanol of unconverted silicon, and obtain a mixture of n-butene and so buteno, (d) separate the mixture to obtain a n-butene feed, and separate the key parts of the selectively recycled isobutylene from (a) to B-stage dehydration and desulfurization reactors,(e) The current (n) is fed to a met atesis reactor, and is associated with the catalyst in the met atesis reactor. In the presence of ethylene, it can be selectively carried out under the condition of effective production of propylene; (f) a recipe (P) mainly including propylene is recovered from the met atesis reactor, Non reactive n-butadiene, heavy product, selective non reactive ethylene, (g) split (P) to recover propylene, and optionally recycle unreacted n-butene and unreacted ethylene.