Process for refining C-4 hydrocarbon fluid

Abstract

The invention discloses a process for refining C-4 hydrocarbon fluid. Preparation equipment includes a methanol removing tower, a first hydrogenation reactor, a second hydrogenation reactor, a depropanizing column, a dethanizing column and an adsorption tower, wherein the top of the methanol removing tower is connected with the bottom of the first hydrogenation reactor through a high-efficiency coalescer; the top of the first hydrogenation reactor is connected with the bottom of the second hydrogenation reactor through a pipeline; the top of the second hydrogenation reactor is connected with the depropanizing column through another pipeline; the top of the depropanizing column is connected with the dethanizing column through another pipeline; and the bottom of the dethanizing column is connected with the adsorption tower through another pipeline. The process mainly aims to a purification process of an alkylation raw material, and comprises the following steps: by taking mixed C-4 hydrocarbon as a raw material, extracting with water to remove methanol so as to reduce the content of methanol in C-4 hydrocarbon to be lower than 50ppm, selectively adding hydrogen and isomerizing so as to reduce the content of butadiene in C-4 hydrocarbon to be lower than 50ppm, converting more than 70% of 1-butene into 2-butene, and finally rectifying to remove dimethyl ether and C-3, thereby obtaining refined C-4 as the alkylation raw material, and a byproduct refined C-3 as a propane dehydrogenation propylene raw material.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a refining process of a C4 hydrocarbon stream. Background technique [0002] C4 hydrocarbons are important petrochemical raw materials. They are the general term for C4 alkanes, monoolefins and dienes. In petrochemical enterprises, catalytic cracking, ethylene cracking, aromatics reforming and coal chemical coal-to-olefins will produce a considerable amount of by-products. Mixed carbon tetrahydrocarbons. For the comprehensive utilization of C4Hs, with the rapid development of my country's petrochemical and coal chemical industries in recent years, the problem of effective utilization of C4Hs resources has become more and more prominent. Especially when the use of MTBE (methyl tert-butyl ether) may be completely banned in the future, it is necessary to process C4 hydrocarbons to produce alkylated oil, and to develop and apply C4 hydrocarbons using new techno...

AI Technical Summary

Problems solved by technology

Each ton of sulfide can cause 16-60t of sulfuric acid to be scrapped

In addition to increasing acid consumption, sulfides in raw materials can also cause the color of alkylated oil to turn yellow, have an odor, and even produce foam, which seriously affects the quality of alkylated products.

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