Method for improving content of 2-methyl-2-butylene in coarse isoamylene

Abstract

The invention relates to a method for improving the content of 2-methyl-2-butylene in coarse isoamylene, which comprises the following steps: tert butyl alcohol is added to the coarse isoamylene; and then the coarse isoamylene with the tert butyl alcohol is subjected to an isomerization reaction through a fixed bed catalyst bed layer consisting of sulfonic acid group cation exchange resin so as to ensure that 2-methyl-1-butylene in the coarse isoamylene is converted into the 2-methyl-2-butylene, wherein the addition of the tert butyl alcohol takes the coarse isoamylene as a reference and is 0.2-2.2 percent by weight; the mass exchange capacity of the sulfonic acid group cation exchange resin is 3-5.5 mmol / g, and the mass space velocity is 1-35 hr<-1>; the reaction temperature is 18-45 DEGC; and the reaction pressure is 0.3-1.0 MPa. The method effectively restrains respective or mutual dipolymer reactions of the 2-methyl-2-butylene and the 2-methyl-1-butylene in the process of the isomerization reaction.

Description

technical field [0001] The invention relates to a method for increasing the content of 2-methyl-2-butene in crude isopentene, in particular to carrying out isomerization of crude isopentene through a fixed-bed catalyst bed composed of sulfonic acid-based cation exchange resin Reaction, a method for increasing the content of 2-methyl-2-butene in crude isopentene. Background technique [0002] Isoamylene is an important chemical raw material used in the production of resins and pesticide intermediates. Isoamyl is usually a mixture of 2-methyl-2-butene and 2-methyl-1-butene. Since only 2-methyl-2-butene is the active ingredient for most reactions, isoamyl The higher the 2-methyl-2-butene content, the higher the application value. [0003] Isoamylene mainly exists in the C5 fraction of catalytically cracked gasoline or the C5 fraction produced by naphtha cracking to produce ethylene. Since these C5 materials contain many compounds with very close boiling points, it is not eas...

AI Technical Summary

Problems solved by technology

[0004] However, while the isomerization reaction is carried out, 2-methyl-2-butene and 2-methyl-1-butene are all prone to dimerization reactions individually or with each other. Dimer content will reach about 4wt%

Although the dimer can be removed through the refining process, this will lead to a decrease in product yield and an increase in energy consumption

On the other hand, the reaction heat of the dimerization reaction will also cause abnormal fluctuations in the temperature of the catalyst bed, making it difficult to control the isomerization reaction smoothly.

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