Method for isomerizing isopentene

A technology of isomerization and isopentene, which is applied in the field of 2-methyl-2-butene content, can solve the problems of increasing the burden of product purification, achieve the elimination of abnormal fluctuations in catalyst bed temperature, increase selectivity, reduce The effect of dimer content

Inactive Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But its disadvantage is that another substance is introduced into the reaction system, which obviously increases the burden of product purification

Method used

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  • Method for isomerizing isopentene
  • Method for isomerizing isopentene
  • Method for isomerizing isopentene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8

[0024] A commercially available spherical sulfonic acid-based cation exchange resin catalyst is used, with a particle size of 0.40-1.25 mm. The mass exchange capacity of the resin is 3~5.5mmol / g; the specific surface area is 30~80m 2 / g, the pore volume is 0.1-1.0mL / g. The resin is soaked in the prepared alkaline aqueous solution, washed three times with deionized water after soaking, and then dehydrated and dried for later use.

[0025] The specific catalyst modification treatment conditions of each embodiment are shown in Table 2.

[0026] Table 2.

[0027]

[0028] 3. Isomerization reaction

Embodiment 9～14

[0030] The catalysts prepared in Examples 1-8 were loaded into the reactor to form a fixed-bed catalyst bed, and the isomerization reaction was carried out. The reactor is a stainless steel tubular reactor of φ25mm×1500mm, and a temperature-controlled jacket of circulating hot water is installed on the outside, and a temperature-measuring platinum resistor is installed on the upper, middle and lower parts of the catalyst bed. The amount of reaction feed is controlled by a feed pump, and the system pressure is regulated by a back pressure valve.

[0031] The reaction raw material crude isopentene passes through the fixed bed according to the set feed amount, and isomerization reaction is carried out according to the set reaction conditions. The reaction conditions of each embodiment are shown in Table 3.

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Abstract

The invention relates to a method for isomerizing isopentene. The method comprises the following step: carrying out isomerization reaction on coarse isopentene through a fixed bed catalyst layer so as to convert 2-methyl-1-butylene in the coarse isopentene into 2- methyl-2-butylene. The catalyst is sulfonic cation exchange resin, and the sulfonic cation exchange resin is modified before use. The modification process comprises the following steps: soaking the resin in an alkaline water solution prepared from NaOH or KOH at normal temperature for 10-35 hours, wherein the concentration of the alkaline water solution is 0.1-1.0 wt%, and the volume ratio of alkaline water solution to the resin is (1.1-2):1; and after soaking finishes, washing with deionized water, dehydrating and drying. The method provided by the invention has the advantages that the dimerization reaction during isomerization reaction is effectively inhibited; particularly, in the technical scheme, no additional substance is introduced into the reaction system, therefore, no additional load is added to the purification or refinement of the product; and the defects in the prior art are solved.

Description

technical field [0001] The present invention relates to a method for isomerization of isopentene, in particular to carrying out isomerization reaction of crude isopentene through a fixed-bed catalyst bed composed of sulfonic acid-based cation exchange resin, so as to increase the 2 - Method for methyl-2-butene content. Background technique [0002] Isoamylene is an important chemical raw material, which is used to produce pinacolone, and then to produce high-efficiency triazole fungicides, plant growth regulators, herbicides, etc. Isoamylene is also used as an intermediate for many fragrances and pesticides, as well as an ultraviolet absorber, photographic photosensitive material and concrete dispersant. Isopentene 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, isopentene The higher the 2-methyl-2-butene content, the higher the application value. [0003] Isoamylene mainly exists i...

Claims

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Application Information

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IPC IPC(8): C07C11/10C07C5/25B01J31/10B01J37/00
Inventor 徐泽辉范存良常慧汤育娟朱瑶
Owner CHINA PETROLEUM & CHEM CORP
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