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A method for aromatizing mixed light hydrocarbons

A technology for aromatization and light hydrocarbons, applied in chemical instruments and methods, purification/separation of hydrocarbons, organic chemistry, etc., can solve the problem of low yield of low-carbon olefins, and achieve the effect of improving yield and good technical effect

Active Publication Date: 2020-10-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is the low yield of low-carbon olefins existing in the prior art, and a new method for aromatizing mixed light hydrocarbons is provided

Method used

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  • A method for aromatizing mixed light hydrocarbons

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] according to figure 1In the process shown, the light hydrocarbon raw material flow rate is 47 tons / hour, and the volume fraction composition is hydrogen 54%, methane 8%, carbon 2 12%, carbon 3 and above 26%. The mass content of aromatics in the light hydrocarbon raw material is 4.9%. The operating pressure of the absorption tower is 3.2MPa, and the flow rate of the absorption tail gas is 13 tons / hour. The amount of absorbent is 80 tons / hour, and the mass fraction of propane is 73%. The operating pressure of the deethanizer is 2.7 MPa, the flow rate of carbon dioxide at the top of the tower is 22 tons / hour, and the flow rate at the bottom of the tower is 94 tons / hour. Carbon dioxide flows through the ethylene rectification tower to recover 13 tons / hour of ethylene and 9 tons / hour of ethane. The flow rate of the depentanizer overhead stream is 44 tons / hour, and the flow rate of aromatics in the tower bottom is 25 tons / hour. The light hydrocarbon aromatization reaction...

Embodiment 2

[0038] According to the conditions and steps described in Example 1, after the light hydrocarbon raw material and the recycled light hydrocarbon are combined, they are first cooled to 10°C before being sent to the absorption tower, and after the gas-liquid separation operation, the gas phase goes to the absorption tower, and the liquid phase goes to the debenzene tower. The amount of absorbent in this embodiment is 70 tons / hour, which can effectively reduce the load of the absorption tower by about 12%. The yield of aromatics was 63.4%, and the regeneration period of the catalyst was 35% longer than that of Comparative Example 1.

Embodiment 3

[0040] According to the conditions and steps described in Example 1, after the light hydrocarbon raw material and the circulating light hydrocarbon are combined, before being sent to the absorption tower, 90% of hydrogen is removed by membrane separation technology, so as to improve the absorption of carbon 2 and above components in the feed. Partial pressure, improve absorption efficiency, the consumption of absorbent is 73 tons / hour. The yield of aromatics was 65.9%, and the catalyst regeneration cycle was extended by 32% compared with Comparative Example 1.

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Abstract

The invention relates to a mixed light hydrocarbon aromatization method. A purpose of the present invention is to mainly solve the problems of easy coking, rapid deactivation and low yield of aromatichydrocarbons of the light hydrocarbon aromatization catalyst in the prior art. The technical scheme comprises that 1) a light hydrocarbon raw material is separated in an absorption tower to obtain absorption tail gas and an absorption liquid; 2) the absorption liquid is separated in an ethane removing tower to obtain a C2 stream and a stream with a carbon atom number of more than or equal to 3; 3) the C2 stream enters an ethylene rectification tower and is separated into ethylene and ethane, wherein ethylene enters a light hydrocarbon aromatization reactor; 4) the stream with a carbon atom number of more than or equal to 3 partially returns to the absorption tower, and the remaining part enters a pentane removing tower; 5) the stream of the pentane removing tower kettle is subjected to aromatic hydrocarbon post-treatment, and the stream of the pentane removing tower top enters the light hydrocarbon aromatization reactor; 6) the light hydrocarbon aromatization reaction product is cooled, and the cooled product is separated in a gas-liquid separator to obtain circulation light hydrocarbons and a liquid phase; and 7) the liquid phase returns to the pentane removing tower, and the circulation light hydrocarbons return the absorption tower. With the technical scheme, the problems in the prior art are well solved. The method of the present invention can be used in the industrial production of light hydrocarbon aromatization.

Description

technical field [0001] The invention relates to a method for aromatizing mixed light hydrocarbons. [0002] technical background [0003] Aromatics, especially light aromatics BTX (benzene, toluene, xylene), are important basic organic chemical raw materials, and their output and scale are second only to ethylene and propylene. Among aromatic hydrocarbons, p-xylene is a product with high added value. P-xylene is an important raw material for the polyester industry, mainly used to produce purified terephthalic acid (PTA) or purified dimethyl terephthalate (DMT), and then to produce polyester (PET) from PTA and DMT. [0004] Light aromatics are usually produced from naphtha as a raw material through catalytic reforming and aromatics combined devices. Methanol-to-aromatics is a new technical route for producing aromatics from coal-based methanol. my country is rich in coal resources, and the development of methanol-to-aromatics technology is an important supplement to the tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/08C07C7/00C07C7/04C07C15/04C07C15/06C07C15/08
CPCC07C2/08C07C7/005C07C7/04C07C15/04C07C15/06C07C15/08
Inventor 金鑫胡帅贺来宾
Owner CHINA PETROLEUM & CHEM CORP