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Method for preparing isopentene

A technology of isopentene and crude isopentene, which is applied in the field of preparation of isopentene, can solve problems such as consumption, increase equipment investment, reduce sulfur content and remove alkaline substances, and achieve the goal of simplifying process steps and overcoming defects Effect

Inactive Publication Date: 2019-04-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the alkaline substances and trace amounts of sulfur contained in crude isopentene can easily lead to the deactivation of the selective hydrogenation catalyst. Therefore, it is usually necessary to pretreat the raw material by desulfurization agent and purified water washing before hydrogenation, so as to reduce the Sulfur content and removal of alkaline substances
[0005] In the prior art, the selective hydrogenation process not only increases the equipment investment, consumes the selective hydrogenation catalyst and hydrogen, but also inevitably increases the loss of crude isopentene. Three waste treatment costs

Method used

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  • Method for preparing isopentene

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Embodiment

[0029] The technological process of embodiment sees figure 1 Shown, take crude isopentene as raw material to obtain high-purity isopentene product through following process:

[0030] Step 1), the crude isopentene in the isopentene raw material tank passes through the polymerization reactor 100 provided with the catalyst bed in liquid phase, and the polymerization reaction is carried out in the polymerization reactor 100, so that the isoprene in the crude isopentene The catalyst is macroporous styrene-based anion exchange resin.

[0031] The mass space velocity in the polymerization reactor is 1~20hr -1 , the corresponding reaction temperature is 20-60° C., and the corresponding reaction pressure is 0.3-2.0 MPa.

[0032] Through the aforementioned control of the diolefin polymerization reaction conditions, the content of the diolefin before the etherification reaction can be reduced to below 0.3%.

[0033] Step 2), the reaction product material W1 is obtained from step 1), a...

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Abstract

The invention provides a method for preparing isopentene, and relates to the technical field of preparation of isopentene. Crude isopentene undergoes a polymerization reaction in the form of a liquidphase through a catalyst bed under a mass space velocity of 1-20 hr<-1> at a reaction temperature of 20-60 DEG C under a reaction pressure of 0.3-2.0 MPa according to different polymerization activities of diolefins and monoolefins in order to polymerize the diolefins in the crude isopentene and reduce the content of the diolefins in the crude isopentene raw material before etherification, and thecatalyst is a weakly basic anion exchange resin; and the obtained polymerization reaction product undergoes etherification, rectification, ether cracking and rectification to obtain highly pure isopentene. The method simplifies existing process steps and effectively overcomes the deficiencies of the prior art.

Description

technical field [0001] The invention relates to the technical field of isoamylene preparation. 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. [0003] Isoamylene mainly exists in the C5 fraction of catalytic cracked gasoline or the C5 fraction of the by-product of naphtha cracking to ethylene. Since these C5 materials contain many compounds with very close boiling points, isopentene is separated from them and not easy. At present, the most widely used separation method is methyl tert-amyl ether cracking method, that is, the C5 fraction reacts with methanol to generate methyl tert-amyl ether, then refines to obtain high-purity methyl tert-amyl ether...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/177C07C7/148C07C1/20C07C7/04C07C9/18C07C41/06C07C43/04
CPCC07C1/20C07C7/005C07C7/04C07C7/148C07C7/177C07C41/06C07C41/42C07C2527/188C07C9/18C07C43/046
Inventor 秦技强许惠明黄勇谢家明董宁王世卿罗群李静
Owner CHINA PETROLEUM & CHEM CORP