Tube and fixed bed coupled microchannel alkylation reactor and its application

Abstract

The invention belongs to the petrochemical field, and discloses a tube nest and fixed bed coupling micro-channel alkylation reactor and application thereof. The tube nest and fixed bed coupling micro-channel alkylation reactor comprises a top seal head IV, a tube nest bed layer III, a fixed bed layer II and a bottom seal head I. The top seal head IV, the tube nest bed layer III, the fixed bed layer II and the bottom seal head I are longitudinally sequentially fixedly serially connected with one another; a hydrocarbon distributor (9) and an acid distributor (7) are arranged in an inner cavity of the top seal head IV; an acid inlet (6) and a hydrocarbon inlet (8) are sequentially respectively communicated with the acid distributor (7) and the hydrocarbon distributor (9); tube nest bundles (4) are longitudinally parallelly arranged in a middle region of the tube nest bed layer III; micro-channel components (5) are arranged in the tube nest bundles (4); cooling medium cavities are arranged in the tube nest bed layer III; micro-channel component modules (2) are arranged in the fixed bed layer II. The tube nest and fixed bed coupling micro-channel alkylation reactor and the application have the advantages that the problem of uneven temperature distribution of an alkylation reactor can be effectively solved, the tube nest and fixed bed coupling micro-channel alkylation reactor is good in raw material distribution, easy to control and high in product quality, and the like.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and discloses a microchannel alkylation reactor coupled with a column tube and a fixed bed and an application thereof. Background technique [0002] At present, various countries in the world have increasingly strict requirements on gasoline indicators, and the production process of high-quality gasoline has become the focus of attention. The alkylation process produces high-quality gasoline blending components, among which the sulfuric acid alkylation process is the most conventional and mature Methods. Sulfuric acid alkylation reaction, that is, the reaction of isobutane and C3~C5 olefins under the action of sulfuric acid catalyst to generate gasoline components with high octane number. The reaction product has the characteristics of low sulfur and does not contain aromatics and olefins. [0003] The alkylation reaction is suitable to be carried out at a lower temperature. Mass transfer i...

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Problems solved by technology

[0004] However, in the above-mentioned patents, a large amount of alkane material is fed, and olefins are added in stages, and the ratio of alkanes at different axial positions in the reactor is different. More importantly, there are differences in the residence time of olefins and alkylated oil products in the reactor.

In order to ensure the conversion rate of olefins added at the bottom of the reactor, the alkylated oil generated in the upper part of the reactor will further react with olefins under the catalysis of liquid acid, which affects the selectivity of the reaction process and limits the product quality of the alkylated oil

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