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Isobutene preparation method

A technology of isobutene and isobutane, applied in the field of isobutene preparation, can solve the problems of low utilization rate of LPG and low economic added value, and achieve the effect of reducing the preparation cost and improving the yield of isobutene

Active Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a new preparation method of isobutylene in order to overcome the low problems of existing LPG utilization rate and economic added value

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0022] The preparation method of described isobutylene according to the present invention comprises the following steps:

[0023] (1) Separating isobutane from liquefied petroleum gas and hydrogenating other components;

[0024] (2) subjecting the hydrogenation reaction product obtained in step (1) to an isomerization reaction;

[0025] (3) Subjecting the isobutane separated in step (1) and / or the isomerization product obtained in step (2) to steam cracking reaction.

[0026] In the method for preparing isobutene according to the present invention, liquefied petroleum gas (LPG) refers to petroleum gas liquefied under pressure (about 1 MPa) at room temperature, and its main components are C3 and C4 hydrocarbons, except In addition, it also contains a very small amount of components below carbon 2 and components above carbon 5. Due to differences in the content of LPG components produced by different devices, the following table 1 lists the range of a certain LPG main componen...

preparation example 1

[0077] Based on the composition of the LPG of sample No. 1, the raw material feed rate is 100kg / h, the temperature is 40°C, and the pressure is 11atm into the separation system. The separation conditions of the LPG of the No. 1 sample are shown in Table 3. The separation of the LPG of the No. 1 sample The results are shown in Table 4.

[0078] table 3:

[0079]

Carbon three towers

Carbon Four Towers

carbon five tower

Theoretical number of boards

35.0

99.0

30.0

Tower top temperature ℃

25.4

34.1

50.5

Bottom temperature °C

76.9

60.3

94.8

Tower top pressure atm

10.0

4.5

5.0

Tower bottom pressure atm

10.1

6.0

5.1

Reflux ratio

10.0

20.0

3.0

[0080] Table 4:

[0081]

[0082] As can be seen from the above results, the mass content of isobutane in the C4 overhead material is 99% by weight, and the remainder is isobutene, 1-butene and tra...

preparation example 2

[0092] Based on the composition of the LPG of sample No. 2, the raw material feed rate is 100kg / h, the temperature is 40°C, and the pressure is 11atm into the separation system. The separation conditions of the LPG of the No. 2 sample are shown in Table 5. The separation of the LPG of the No. 2 sample The results are shown in Table 6.

[0093] table 5:

[0094]

Carbon three towers

Carbon Four Towers

Theoretical number of boards

35.0

99.0

Tower top temperature ℃

24.2

34.1

Bottom temperature °C

69.2

58.3

Tower top pressure atm

10.0

4.5

Tower bottom pressure atm

10.1

6.0

Reflux ratio

10.0

20.0

[0095] Table 6:

[0096] Flow ratekg / h

raw material

Carbon three tower top

Carbon three tower bottom

C4 tower top

C4 tower bottom

hydrogen

0.00

0.00

0.00

0.00

0.00

methane

0.00

0.00

0.00

0.00

...

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Abstract

The invention relates to an isobutene preparation method, and the method includes the steps as follows: (1) separating isobutane from liquefied petroleum gas, and performing hydrogenation reaction on other components; (2) performing isomerization reaction on hydrogenation reaction products obtained by the step (1); and (3) performing steam cracking reaction on the isobutane separated by the step (1) and / or isomerization products obtained by the step (2); the invention also relates to an isobutene preparation method, and the method includes the steps as follows: (1) performing hydrogenation reaction on the liquefied petroleum gas, and separating isobutane from hydrogenation reaction products; (2) performing isomerization reaction on other components with the isobutane separated by the step (1); and (3) performing steam cracking reaction on the isobutane separated by the step (1) and / or isomerization products obtained by the step (2); according to the method, the isobutene yield can be increased significantly, and the preparation cost is greatly reduced.

Description

technical field [0001] The present invention relates to a kind of preparation method of isobutene. Background technique [0002] With the large-scale installation of petrochemical production enterprises, the processing capacity of a single set of oil refining equipment in my country has exceeded 10 million tons per year, and the production capacity of the matching ethylene plant has also reached an annual output of 800,000 to 1.2 million tons of ethylene. The output of domestic liquefied petroleum gas (LPG) produced in oil refining and ethylene process production has increased year by year. Currently, the annual output of LPG has exceeded 10 million tons. [0003] The source of LPG is different, and its component content is quite different. Normally, the main components of LPG include components below carbon three, carbon four and above carbon five. Among them, the components below carbon three mainly include propane, and may also include a small or trace amount of hydroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/09C07C5/327
Inventor 杜志国王国清张永刚周丛薛丽敏刘同举
Owner CHINA PETROLEUM & CHEM CORP
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