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Method for cooperatively producing ethylbenzene by preparing xylene from alcohol ether

A technology of xylene and alcohol ether, which is applied in the field of co-production of ethylbenzene from alcohol ether to xylene, can solve the problems of inability to obtain ethylene and benzene, and achieves the effect of strong adaptability

Active Publication Date: 2017-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem in the prior art that the matching ratio of ethylene and benzene for producing ethylbenzene cannot be obtained while producing more xylene, and a new method for co-producing ethylbenzene by producing xylene from alcohol ether is provided

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  • Method for cooperatively producing ethylbenzene by preparing xylene from alcohol ether

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Experimental program
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Effect test

Embodiment 1

[0023] according to figure 1 In the process flow shown, the methanol feed with a flow rate of 140kmol / hr is reacted in the alcohol ether aromatization reactor, and the ZSM-5 alcohol ether aromatization catalyst containing Zn 7% is used, and the alcohol ether aromatization reaction temperature is 450 ℃, pressure 0.1MPa, catalyst mass space velocity 0.5hr -1 . The alcohol ether aromatization product contains 5% ethylene, 0.7% benzene, and 28% xylene in terms of carbon-based mass fraction. Light hydrocarbon aromatization reaction temperature is 500°C, pressure is 0.3MPa, catalyst mass space velocity is 2hr -1 . The operating pressure of the absorption tower is 1.0MPa, and the liquid-gas ratio is 325L / m 3 , The absorbent includes benzene, toluene, xylene, the ethylene absorption rate of the absorption tower is 58.6%, and there is no propylene in the absorption tail gas. The aromatics conversion and separation unit adopts traditional toluene disproportionation and transalkylat...

Embodiment 2

[0025] according to figure 1 In the process flow shown, the methanol feed with a flow rate of 140kmol / hr is reacted in the alcohol ether aromatization reactor, and the ZSM-5 alcohol ether aromatization catalyst containing Zn 1.2% is used, and the alcohol ether aromatization reaction temperature is 550 ℃, pressure 0.2MPa, catalyst mass space velocity 2hr -1 . The alcohol ether aromatization product contains 8% ethylene, 0.5% benzene, and 33% xylene in terms of carbon-based mass fraction. Light hydrocarbon aromatization reaction temperature is 550°C, pressure is 0.1MPa, catalyst mass space velocity is 3hr -1 . The operating pressure of the absorption tower is 3MPa, and the liquid-gas ratio is 152L / m 3 , The absorbent includes benzene, toluene, xylene, the ethylene absorption rate of the absorption tower is 61.3%, and there is no propylene in the absorption tail gas. The aromatics conversion and separation unit adopts traditional toluene disproportionation and transalkylatio...

Embodiment 3

[0027] according to figure 1 In the process flow shown, the dimethyl ether feed with a flow rate of 70kmol / hr is reacted in the alcohol ether aromatization reactor, and the ZSM-5 alcohol ether aromatization catalyst containing Zn 7% and Cu 2% is used, and the alcohol ether Aromatization reaction temperature 600°C, pressure 0.4MPa, catalyst mass space velocity 3hr -1 . The alcohol ether aromatization product contains 9% ethylene, 3% benzene and 31% xylene in terms of carbon-based mass fraction. Light hydrocarbon aromatization reaction temperature is 600°C, pressure is 0.1MPa, catalyst mass space velocity is 2.5hr -1 . The operating pressure of the absorption tower is 1.5MPa, and the liquid-gas ratio is 233L / m 3 , The absorbent includes benzene, toluene, xylene, the ethylene absorption rate of the absorption tower is 65.7%, and there is no propylene in the absorption tail gas. The aromatics conversion and separation unit adopts traditional toluene disproportionation and tra...

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Abstract

The invention relates to a method for cooperatively producing ethylbenzene by preparing xylene from alcohol ether. The method mainly aims at solving the problem that in the prior art, ethylene and benzene which are of the matched proportion for producing ethylbenzene cannot be obtained while xylene is produced. The method comprises the following steps that an alcohol ether aromatization product is separated into a gas phase I, an oil phase I and an aqueous phase in a separation unit; the gas phase I is sent into an absorption tower, so that part of C2, all C3 and above components are absorbed, absorption liquid is sent into a desorption tower to be separated into light dydrocarbon and residues, the residues are divided into two subsidiary substance flows, the subsidiary substance flow I returns to the absorption tower as an absorbing agent, and the subsidiary substance flow II is sent into an arene conversion and separation unit; the light dydrocarbon is converted into a light dydrocarbon aromatization product through a light dydrocarbon aromatization reactor; the light dydrocarbon aromatization product is separated into a gas phase II and an oil phase II through a gas-liquid separator; and the oil phase I and the oil phase II are sent into the arene conversion and separation unit, and benzene is sent into an ethylbenzene device. By means of the method, the mentioned problem is well solved; and the method can be applied to industrial production for preparing the xylene from the alcohol ether.

Description

technical field [0001] The invention relates to a method for co-producing ethylbenzene by producing xylene from alcohol ether. [0002] technical background [0003] Aromatics, especially light aromatics BTX (benzene, toluene, xylene) is an important basic organic chemical material, its output and scale are second only to ethylene and propylene, and its derivatives are widely used in chemical products such as chemical fibers, plastics and rubber and the production of fine chemicals. In recent years, with the continuous development of petrochemical and textile industries, the demand for aromatics has been increasing. The current main sources of BTX are catalytic reforming and pyrolysis gasoline by-products, both of which use petroleum as the initial raw material for production. With the continuous consumption of crude oil in the world and the continuous rise of international oil prices, the production capacity of aromatics has been suppressed, and the production cost has ris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C15/08C07C2/64C07C15/073
CPCC07C1/20C07C2/64C07C15/08C07C15/073
Inventor 杨卫胜金鑫贺来宾
Owner CHINA PETROLEUM & CHEM CORP