Method and device for refining C4 ionic liquid alkylation raw material by utilizing C4 after ether

Abstract

The invention provides a method and device for refining carbon-4 ionic liquid alkylation material by the aid of etherified carbon 4. The method includes: sequentially removing mercaptan from the carbon-4 raw material through a primary fiber liquid film contact reactor after impurities are filtered via a carbon-4 filter primarily and removing alkali and methanol through a secondary fiber liquid film contact reactor; removing light components including dimethyl ether through a light removal tower; further lowering the content of free water, carbonyl sulfide and H2S in the carbon-4 raw material components through an alkali solidifying tower; performing drying and dewatering through a molecular sieve drying tower; further removing methanol, dimethyl ether and MTBE (methyl tert-butyl ether) through a purification tower; performing dearsenification through a dearsenification tank to obtain the refined carbon-4 ionic liquid alkylation material. The method is unique in process design and low in energy consumption, the etherified carbon 4 of a refinery plant can be completely refined to obtain the highly refined carbon 4, and needs of the ionic liquid alkylation process are met.

Description

technical field [0001] The invention belongs to the technical field of post-ether refining methods, and relates to a method and a device for using post-ether C4 to refine C4 ionic liquid alkylation raw materials. Background technique [0002] C4 hydrocarbons after ether are the C4 produced by the catalytic cracking process and the by-product of MTO to produce MTBE raffinate C4, mainly composed of n-butene, n-butane and isobutane. C4 hydrocarbons have extensive and important uses in industrial production, and are important basic raw materials for petrochemical products. As petrochemical raw materials, the application of C4 hydrocarbons has been continuously developed. For example, C4 hydrocarbons produced by catalytic cracking can be used to produce alkylated gasoline and higher alcohols, and can also be used to prepare propylene and ethylene by catalytic cracking. [0003] my country is rich in post-ether C4H resources, which mainly come from catalytic cracking process and ...

AI Technical Summary

Problems solved by technology

Among them, the gas-phase high-temperature refining process is limited due to high energy consumption, catalysts generally use alumina as the carrier, copper oxide as the active component, low adsorption capacity, and the catalyst needs to be periodically regenerated.

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