CN1651365A - Preparation method of isopentene - Google Patents
Preparation method of isopentene Download PDFInfo
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- CN1651365A CN1651365A CN 200410065355 CN200410065355A CN1651365A CN 1651365 A CN1651365 A CN 1651365A CN 200410065355 CN200410065355 CN 200410065355 CN 200410065355 A CN200410065355 A CN 200410065355A CN 1651365 A CN1651365 A CN 1651365A
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- Prior art keywords
- methyl
- butene
- isopentene
- isoamyl alcohol
- reaction
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A process for preparing isopentene from isopentanol includes dewatering reaction of isopentanol in reactor under the action of active alumina as catalyst to obtain the gas mixture containing 3-methyl-1-butene as main component, and isomerizing reaction at 500-520 deg.C to obtain target product, whose main components are 2-methyl-2-butene and 2-methyl-1-butene.
Description
Technical field
The present invention relates to the preparation method of isopentene.
Background technology
Isopentene is a main raw material of making pesticide intermediate pinacolone (trimethylammonium acetone).Present employed isopentene is the carbon five (C with gained in the petrochemical complex
5) fraction is raw material, C 5 fraction is got by rectifying.Because only contain 9% isopentene in the C 5 fraction, and the same part of isomer that wherein has more than ten kind of boiling point to be close, therefore, the output of isopentene is very low, causes its price relatively more expensive.
Summary of the invention
The present invention will provide a kind of preparation method that can enlarge isopentene output greatly, reduce the isopentene production cost.
The technical solution used in the present invention is: use primary isoamyl alcohol to be raw material, at first primary isoamyl alcohol is imported in the calandria type fixed bed reactor, use activated alumina to be catalyzer, under 350 ℃～400 ℃ temperature ranges, normal pressure, make primary isoamyl alcohol carry out dehydration reaction, obtain the mixed gas that major ingredient is a 3-methyl-1-butene; Make above-mentioned mixed gas carry out further isomerization reaction then in another calandria type fixed bed reactor, temperature of reaction is 500 ℃～520 ℃, just can make the desired product that major ingredient is 2-methyl-2-butene and 2-methyl-1-butene alkene.
The further technical scheme of the present invention is: with above-mentioned major ingredient is that the product of 2-methyl-2-butene and 2-methyl-1-butene alkene carries out rectifying, just can obtain more highly purified isopentene product.
Advantage of the present invention is: use primary isoamyl alcohol to prepare isopentene, can improve the output of isopentene greatly, good social benefit and economic benefit are arranged.
Embodiment
The invention will be further described below by embodiment.
In calandria type fixed bed reactor, add catalyzer, catalyzer mainly is made up of activated alumina and a spot of auxiliary agent, binding agent; The mixed nitrate that adding contains materials such as saltpetre, SODIUMNITRATE, Sodium Nitrite in the gap in reactor shell makes heating more even as heating medium.Import primary isoamyl alcohol gas then, under 350 ℃～400 ℃ temperature ranges, normal pressure, make primary isoamyl alcohol carry out dehydration reaction, obtain the mixed gas that major ingredient is a 3-methyl-1-butene; Make above-mentioned mixed gas carry out further isomerization reaction then in another calandria type fixed bed reactor, temperature of reaction is 500 ℃～520 ℃, just can make the desired product that major ingredient is 2-methyl-2-butene and 2-methyl-1-butene alkene.Then, in rectifying tower, above-mentioned product is carried out rectifying again, and the light component of amputation, get 31 ℃～39 ℃ fraction finished product, the component of the isopentene product that obtains is: 78% 2-methyl-2-butene, 18% 2-methyl-1-butene alkene and other composition of 4%.
Above-mentioned isopentene product can satisfy the requirement that enterprise produces pinacolone (trimethylammonium acetone).
Claims (2)
1, the preparation method of isopentene, it is characterized in that: use primary isoamyl alcohol to be raw material, at first primary isoamyl alcohol is imported in the calandria type fixed bed reactor, use activated alumina to be catalyzer, under 350 ℃～400 ℃ temperature ranges, normal pressure, make primary isoamyl alcohol carry out dehydration reaction, obtain the mixed gas that major ingredient is a 3-methyl-1-butene; Make above-mentioned mixed gas carry out further isomerization reaction then in another calandria type fixed bed reactor, temperature of reaction is 500 ℃～520 ℃, just can make the desired product that major ingredient is 2-methyl-2-butene and 2-methyl-1-butene alkene.
2, the preparation method of isopentene according to claim 1 is characterized in that: with above-mentioned major ingredient is that the product of 2-methyl-2-butene and 2-methyl-1-butene alkene carries out rectifying, just can obtain more highly purified isopentene product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410065355 CN1651365A (en) | 2004-11-26 | 2004-11-26 | Preparation method of isopentene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410065355 CN1651365A (en) | 2004-11-26 | 2004-11-26 | Preparation method of isopentene |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1651365A true CN1651365A (en) | 2005-08-10 |
Family
ID=34868866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410065355 Pending CN1651365A (en) | 2004-11-26 | 2004-11-26 | Preparation method of isopentene |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1651365A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112166170A (en) * | 2018-03-16 | 2021-01-01 | 道达尔销售服务公司 | Preparation of olefins by dehydration of alcohols, and use thereof for the manufacture of polymers, fuels or fuel additives |
-
2004
- 2004-11-26 CN CN 200410065355 patent/CN1651365A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112166170A (en) * | 2018-03-16 | 2021-01-01 | 道达尔销售服务公司 | Preparation of olefins by dehydration of alcohols, and use thereof for the manufacture of polymers, fuels or fuel additives |
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