Method for improving content of 2-methyl-2-butylene

Abstract

The invention discloses a method for improving the content of 2-methyl-2-butylene and particularly relates to a method for improving the content of 2-methyl-2-butylene in isopentene by taking tert-amyl methyl ether as a raw material and adopting methods for ether reaction, isomerization reaction and purification by rectification. Through the technical processes, the mass ratio of 2-methyl-2-butylene to 2-methyl-1-butylene in isopentene can be improved to (8-14):1, so that the quality requirements for subsequent processing are met.

Description

technical field

[0001] The present invention relates to a method for increasing the content of 2-methyl-2-butene, in particular to isoamyl obtained through the etherolysis of methyl tert-amyl ether, which further undergoes a hydroisomerization reaction to increase the content of 2-methyl-2-butene in isoamyl. The method of base-2-butene content. Background technique

[0002] Isoamyl is an important chemical raw material, used to produce pinacolone, and then to produce high-efficiency triazole fungicides, plant growth regulators, herbicides, etc. It is also used as an intermediate for many spices and pesticides, and can also be used as UV absorbers, photographic photosensitive materials and concrete dispersants, etc. . 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 ...

Examples

Embodiment

[0022] Embodiment [1-10]

[0023] Embodiments 1 to 10 use methyl tert-amyl ether as a raw material to obtain isopentene products with higher 2-methyl-2-butene content through the following process:

[0024] 1) methyl tert-amyl ether is carried out etherolysis reaction by gas phase through the catalyst bed of sulfonic acid group cation exchange resin, and methyl tert-amyl ether is decomposed into isopentene and methanol;

[0025] 2) Obtain etherolysis reaction product isopentene by step 1) and carry out isomerization reaction through catalyst bed layer with liquid phase, catalyzer is noble metal catalyst, the 2-methyl-1-butene in isopentene is converted into 2 - Methyl-2-butene;

[0026] 3) The crude isopentene obtained in step 2) can be further rectified, methanol and heavy component impurities are removed from the tower bottom, and the isopentene product is obtained at the top of the tower.

[0027] The technological conditions of each embodiment are shown in Table 1 and Ta...

technical field

[0001] The present invention relates to a method for increasing the content of 2-methyl-2-butene, in particular to isoamyl obtained through the etherolysis of methyl tert-amyl ether, which further undergoes a hydroisomerization reaction to increase the content of 2-methyl-2-butene in isoamyl. The method of base-2-butene content. Background technique

[0002] Isoamyl is an important chemical raw material, used to produce pinacolone, and then to produce high-efficiency triazole fungicides, plant growth regulators, herbicides, etc. It is also used as an intermediate for many spices and pesticides, and can also be used as UV absorbers, photographic photosensitive materials and concrete dispersants, etc. . 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 ...

Examples

Embodiment

[0022] Embodiment [1-10]

[0023] Embodiments 1 to 10 use methyl tert-amyl ether as a raw material to obtain isopentene products with higher 2-methyl-2-butene content through the following process:

[0024] 1) methyl tert-amyl ether is carried out etherolysis reaction by gas phase through the catalyst bed of sulfonic acid group cation exchange resin, and methyl tert-amyl ether is decomposed into isopentene and methanol;

[0025] 2) Obtain etherolysis reaction product isopentene by step 1) and carry out isomerization reaction through catalyst bed layer with liquid phase, catalyzer is noble metal catalyst, the 2-methyl-1-butene in isopentene is converted into 2 - Methyl-2-butene;

[0026] 3) The crude isopentene obtained in step 2) can be further rectified, methanol and heavy component impurities are removed from the tower bottom, and the isopentene product is obtained at the top of the tower.

[0027] The technological conditions of each embodiment are shown in Table 1 and Ta...

Images