Apparatus and method for preparing olefin from methanol

Abstract

The invention provides an apparatus and method for preparing olefin from methanol, which comprises a reactor (1), a reactivator (6), a spent catalyst stripping stage (11), a reactor external catalyst cooler (12) and a reactivator external catalyst cooler (23), and the reactor (1) is internally equipped with a reactor charging distributor (2), a cold regeneration catalyst device external branched distributor (5), a reactor external catalyst cooler catalyst distributor (21), a reactor grating (3), a catalyst and reaction gas separator (4); the reactivator (6) is internally equipped with a reactivator main wind distributor (7), a reactivator grating (8), a spent catalyst device external branched distributor (9), and a regeneration catalyst stripping stage (10). The invention also provides a method for preparing olefin from methanol by using the apparatus for preparing olefin from methanol, and solves the problems of low reaction selectivity and catalyst runoff in the present technology for preparing olefin from methanol.

Description

technical field [0001] The invention relates to the technical fields of olefin production and petrochemical equipment, in particular to a methanol-to-olefin device and a method thereof. Background technique [0002] The traditional production route of ethylene and propylene is through the cracking of naphtha, which has the disadvantage of being overly dependent on petroleum. The production of low-carbon olefins such as ethylene and propylene from methanol (Methanol-to-Olefin, referred to as MTO) is another process route for producing olefins. At present, the development of process technology has become mature. The industrialization of MTO technology has opened up a new process route for the production of basic organic chemical raw materials by gasification of coal or natural gas, which is conducive to changing the product structure of traditional coal chemical industry, and is an effective way to realize the extension of coal chemical industry to petrochemical industry. [...

AI Technical Summary

Problems solved by technology

[0003] The process of methanol to olefins has the characteristics of fast reaction speed, large heat release, reaction temperature, reaction time and carbon content of the regenerated catalyst have a great influence on the selectivity of ethylene + propylene in the reaction product, etc. In addition, the catalyst used in the reaction of methanol to olefins is expensive

The existing methanol-to-olefins device has the following problems: there is a low-temperature dead bed area of ​​the catalyst at the bottom of the traditional reaction gas distribution pipe, so that the reaction gas first contacts the low-temperature catalyst far below the optimal reaction temperature after entering the bed, which reduces the reaction efficiency. Selectivity: Due to the poor effect of the traditional feed distribution pipe and catalyst distributor, there is a local high or low temperature zone in the reactor bed above the feed distribution pipe, which deviates from the optimal reaction temperature and reduces the selectivity of the reaction

After the reaction gas leaves the reaction bed, it cannot be separated from the catalyst immediately, and the reaction cannot be interrupted in time. The reaction gas has a harmful secondary reaction, which reduces the selectivity of the reaction.

The catalyst concentration at the inlet of the reactor cyclone separator is high, resulting in high catalyst unit consumption, which affects the economic benefits of the methanol to olefins unit

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