Isomerization method of 2-methyl-1-butylene

A technology of isomerization and butene, which is applied in the field of 2-methyl-2-butene content, can solve the problems of increasing the burden of product purification, eliminate abnormal fluctuations in catalyst bed temperature, overcome defects, and improve conversion rate and The effect of increased selectivity

Inactive Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • 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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  • Isomerization method of 2-methyl-1-butylene
  • Isomerization method of 2-methyl-1-butylene
  • Isomerization method of 2-methyl-1-butylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8

[0024] Commercially available HZSM-5 molecular sieve is used, the silicon-aluminum ratio is 20-50, and the specific surface area is 200-500m 2 / g, the average pore diameter is 2-8nm. The molecular sieve is soaked in the prepared alkaline aqueous solution, washed three times with deionized water after soaking, and then dehydrated and dried for 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 provides an isomerization method of 2-methyl-1-butylene, which is used for improving the content of the 2-methyl-2-butylene in coarse isoamylene. The method comprises the steps: 1) performing an isomerization reaction on the coarse isoamylene by a catalyst bed layer of a fixed bed to convert the 2-methyl-1-butylene to the 2-methyl-2-butylene, wherein the catalyst is HZSM-5 molecular sieve, the ratio of silicon to aluminum of the catalyst is 20-50, the specific surface of the catalyst is 200-500m<2> / g, and the average pore size of the catalyst is 2-8nm; and 2) modifying the molecular sieve before the molecular sieve is in use, wherein the step of modifying comprises the procedures of soaking the molecular sieve into an alkaline water solution which is prepared from calcium hydroxide or magnesium hydroxide under the normal temperature, the concentration of the alkaline water solution is 0.5-1.5wt%, the volume ratio of the alkaline water solution to the molecular sieve is 1.1-2:1, and the soaking time is 10-36 hours; and washing after the molecular sieve is soaked, dewatering and drying. The method effectively restrains the dimerization reaction when the isomerization reaction is performed, can not put extra burden on the purifying or the refining of a product since other materials can not be led into a reaction system, and effectively overcomes the defects in the prior art.

Description

technical field [0001] The invention relates to a method for isomerizing 2-methyl-1-butene, in particular to carrying out the isomerization reaction of crude isopentene through a fixed-bed catalyst bed composed of HZSM-5 molecular sieves to increase the yield of crude isopentene. Method for the content of 2-methyl-2-butene in alkenes. 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...

Claims

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Application Information

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IPC IPC(8): C07C11/10C07C5/25B01J29/40
Inventor 徐泽辉范存良常慧汤育娟朱瑶
Owner CHINA PETROLEUM & CHEM CORP
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