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A kind of preparation method of light olefin

A low-carbon olefin and ethylene technology, applied in the field of low-carbon olefin preparation, can solve the problems of low comprehensive utilization rate, low economic added value of liquefied petroleum gas resources, bleak prospect of liquefied petroleum gas, etc., and achieve high and low-carbon olefin yield, The effect of improving utilization rate and economic added value

Active Publication Date: 2016-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the liquefied petroleum gas produced by petrochemical enterprises in my country is mainly used for the production of civil liquefied petroleum gas, and only a small amount is used for alkylation and aromatization to produce gasoline and aromatics. The comprehensive utilization rate is lower than 15%, which is far lower than Utilization levels of more than 50% in the United States, Japan and Western Europe lead to low economic value-added of LPG resources
And as the use of natural gas as a clean domestic fuel continues to increase, the outlook for LPG as a fuel is bleak

Method used

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  • A kind of preparation method of light olefin
  • A kind of preparation method of light olefin
  • A kind of preparation method of light olefin

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Experimental program
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preparation example Construction

[0012] The preparation method of light olefin provided by the invention comprises the following steps:

[0013] (1) In the presence of a hydrogenation catalyst, the liquefied petroleum gas is subjected to a full hydrogenation reaction, so that the unsaturated alkanes in the liquefied petroleum gas are basically converted into saturated alkanes, and a full hydrogenation reaction product is obtained;

[0014] (2) Separate the first component and the second component from the full hydrogenation reaction product, the first component is isobutane, and the second component is n-butane or n-butane and A mixture of components above C5; and the first component and the second component are subjected to steam cracking reaction respectively, or the mixture of the first component and the second component is subjected to steam cracking reaction.

[0015] The components of the liquefied petroleum gas are well known to those skilled in the art. Generally speaking, the liquefied petroleum gas ...

Embodiment 1

[0039] This embodiment is used to illustrate the preparation method of the light olefin provided by the present invention.

[0040] (1) Full hydrogenation reaction:

[0041] The main active component of the hydrogenation catalyst used in this embodiment is platinum, the auxiliary active component is silver, and the carrier is alumina, wherein the content of platinum is 0.6% by weight, the content of silver is 0.3% by weight, and the content of carrier is 99.1% by weight. The hydrogenation catalyst was prepared as follows: 100 parts by weight of alumina pellets with a diameter of Φ3-4 were roasted at 1000°C for 6 hours, and the pH value of the nitric acid solution of platinum nitrate with a platinum content of 1.33% by weight was determined by Ammonia water was adjusted to 5, then the calcined alumina pellets were immersed in 45 parts by weight of the nitric acid solution of platinum nitrate with a pH value of 5, and the impregnated alumina pellets were dried at 120°C for 8 ho...

Embodiment 2

[0048] This embodiment is used to illustrate the preparation method of the light olefin provided by the present invention.

[0049] (1) Full hydrogenation reaction:

[0050] Carry out according to the method for embodiment 1.

[0051] (2) Separation:

[0052] Carry out according to the method for embodiment 1.

[0053] (3) Steam cracking reaction:

[0054] The cracking raw material 1, isobutane and cracking raw material 2 obtained in step (2) are respectively introduced into a cracking furnace for steam cracking reaction to obtain three steam cracking products. Wherein, the conditions of the steam cracking reaction are shown in Table 4 below. After mixing the three steam cracking products together, ethylene, propylene and isobutene were separated, and the yields of ethylene, propylene and isobutene were calculated. The results are shown in Table 5.

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Abstract

The invention discloses a method for preparing low-carbon olefins. The method comprises the following steps: (1) in the presence of a hydrogenation catalyst, a full hydrogenation reaction is carried out on liquefied petroleum gas, so that the unsaturated gas in the liquefied petroleum gas is completely hydrogenated. The alkane is basically converted into saturated alkane to obtain a full hydrogenation reaction product; (2) the first component and the second component are separated from the full hydrogenation reaction product, and the first component is isobutane, so The second component is a mixture of n-butane or n-butane and components above C5; and the first component and the second component are respectively subjected to a steam cracking reaction, or the first component is A steam cracking reaction is carried out with the mixture of the second component. By adopting the method provided by the invention, a higher yield of low-carbon olefins can be obtained, thereby improving the utilization rate and economic added value of liquefied petroleum gas.

Description

technical field [0001] The invention relates to a method for preparing low-carbon olefins. Background technique [0002] With the large-scale production equipment of petrochemical enterprises, the processing capacity of a single refinery unit in my country has exceeded 10 million tons per year, and the production capacity of the matching ethylene plant has also reached 800,000-1.2 million tons per year. The butadiene in the mixed C4 component produced by my country's oil refining and ethylene units is extracted and rectified to produce high-purity butadiene, isobutene is produced through etherification reaction to methyl tert-butyl ether (MTBE), and the remaining butane and butene It is mainly used to produce liquefied petroleum gas (LPG for short). At present, the output of liquefied petroleum gas produced by oil refining and ethylene units has increased year by year, and the annual output has exceeded 10 million tons. [0003] The liquefied petroleum gas mainly contains C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C11/06C07C11/09C07C4/06C07C5/333
CPCY02P20/52
Inventor 杜志国王国清刘同举周丛薛丽敏李蔚
Owner CHINA PETROLEUM & CHEM CORP