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Method for producing aromatic hydrocarbons by aromatization of mixed light hydrocarbons

A technology for aromatization and light hydrocarbons, which is applied in the direction of condensation hydrocarbon production with dehydrogenated hydrocarbons, organic chemistry, etc. The effect of improving conversion rate and good technical effect

Active Publication Date: 2020-08-07
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 problem of rapid catalyst deactivation and low total yield of aromatics in the prior art, and provides a new method for aromatizing mixed light hydrocarbons

Method used

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  • Method for producing aromatic hydrocarbons by aromatization of mixed light hydrocarbons

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0037] according to figure 1 In 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 1.6MPa, and the flow rate of the absorption tail gas is 28.6 tons / hour. The amount of the absorbent is 600 tons / hour, the weight ratio of the absorbent stream to the first aromatic hydrocarbon stream is 120, and the mass fraction of BTX is 87%. After the exhaust gas is pressurized to 3.2MPa by the compressor, 3.2 tons / hour of hydrogen is separated in the membrane separator, 12.6 tons / hour of methane is separated in the demethanizer, and 5.7 tons / hour is separated in the ethylene rectification tower Ethylene and 7.1 t / h ethane. The absorption liquid is separated in the depentanizer. The operating pressure of the depentanizer is 0.7MPa, t...

Embodiment 2

[0039] 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 depentyl Alkane tower. In this embodiment, the absorbent consumption is 450 tons / hour, and the weight ratio of the absorbent stream to the first aromatic hydrocarbon stream is 90, which can effectively reduce the load of the absorption tower by about 25%. The yield of aromatics is 59.3%, and the regeneration period of the catalyst is 30% longer than that of the comparative example.

Embodiment 3

[0041] 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 560 tons / hour, and the weight ratio of absorbent flow and first aromatic hydrocarbon flow is 112. The yield of aromatics is 59.6%, and the regeneration period of the catalyst is 31% longer than that of the comparative example.

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Abstract

The invention relates to a method for preparing an aromatic hydrocarbon through light hydrocarbon aromatization. A purpose of the present invention is to mainly solve the problems of easy coking, rapid deactivation and low yield of aromatic hydrocarbons 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 tail gas enters an ethylene recovery unit, and is separated into ethylene, hydrogen and fuel gas,wherein ethylene enters a light hydrocarbon aromatization reactor; 3) the absorption liquid is separated in a pentane removing tower, and is separated into an aromatization reaction raw material and aheavy component stream; 4) the heavy component stream is divided into two streams, wherein one stream used as an absorbent returns to the absorption tower, and the other stream is used as a first aromatic hydrocarbon stream product; 5) the aromatization reaction raw material and the ethylene are fed into the light hydrocarbon aromatization reactor; 6) the light hydrocarbon aromatization reactionproduct is cooled, and the cooled product is separated in a gas-liquid separator to obtain circulation light hydrocarbons and a second aromatic hydrocarbon stream product; and 7) the circulation lighthydrocarbons 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 producing aromatic hydrocarbons through aromatization of 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 tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/76C07C15/04C07C15/06C07C15/08
CPCC07C2/76C07C15/04C07C15/06C07C15/08
Inventor 杨卫胜金鑫
Owner CHINA PETROLEUM & CHEM CORP