Method for increasing proportion of 2-methyl-2-butene in isoamylene

Abstract

The invention relates to a method for increasing the proportion of 2-methyl-2-butene in isoamylene, which comprises the following steps of: adding the mixture of tertiary butyl alcohol and water into a raw material isoamylene, and then carrying out an isomerization reaction on the mixture through a fixed bed catalyst bed layer formed from sulfonic cation exchange resin so as to enable 2-methyl-1-butene in the raw material isoamylene to be converted into the 2-methyl-2-butene. The mass ratio of the tertiary butyl alcohol to the water is 100: (20-40), and the addition is 0.1-0.6wt% by being calculated by the tertiary butyl alcohol and using the raw material isoamylene as a reference. The mass transfer capability of the sulfonic cation exchange resin is 3-5.5mmol / g, the mass airspeed is 1-35hr-1, the reaction temperature is 18-45 DEG C, and the reaction pressure is 0.3-1.0MPa. The method has the advantages that through the inhibition of a dimerization reaction, the invention greatly lowers the content of dimer in an isomerization reaction product and basically eliminates the phenomenon of catalyst bed layer temperature abnormal fluctuation caused by the heat release of the dimerization reaction.

Description

technical field [0001] The present invention relates to a method for increasing the ratio of 2-methyl-2-butene in isopentene, in particular to carrying out isomerization reaction of raw isopentene through a fixed-bed catalyst made of sulfonic acid-based cation exchange resin, and The method of isomerizing 2-methyl-1-butene in isopentene to 2-methyl-2-butene to increase the ratio of 2-methyl-2-butene in isopentene. Background technique [0002] Isoamylene is an important chemical raw material used in the production of resins and pesticide intermediates. Isoamylene is usually a mixture of 2-methyl-2-butene and 2-methyl-1-butene, since for most reactions only 2-methyl-2-butene is the active ingredient, so The higher the ratio of 2-methyl-2-butene in isopentene, 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 co...

AI Technical Summary

Problems solved by technology

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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