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Method for preparing aromatic hydrocarbon by methyl alcohol

A technology for methanol preparation and aromatic hydrocarbons, which is applied in the purification/separation of hydrocarbons, chemical instruments and methods, and hydrocarbon production from oxygen-containing organic compounds, etc. Good technical effect, avoid cumulative effect

Active Publication Date: 2018-03-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem of ethane accumulation and low yield of aromatics in the methanol-to-aromatics system in the prior art, and a new method for preparing aromatics from methanol is provided

Method used

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  • Method for preparing aromatic hydrocarbon by methyl alcohol

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Experimental program
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Effect test

Embodiment 1

[0031] use figure 1 In the process flow shown, the methanol raw material is industrial methanol. The methanol aromatization reactor adopts a fluidized bed reactor, the aromatization catalyst used is a modified ZSM-5 molecular sieve, and the zinc oxide content of the auxiliary agent is 10% by weight. The reaction temperature is 400°C, the pressure is 0.1MPAG, and the weight space velocity is 0.2HR -1 . The reaction product was separated into gas phase, oil phase and water phase after cooling to 40°C. The gas phase is first washed with water in a water washing tower to remove oxygenated compounds. The liquid-to-gas mass ratio of the water washing tower is 3.2. The light hydrocarbon stream after water washing is separated from hydrogen and methane in the demethanizer, and the product hydrogen is separated by a pressure swing adsorption unit. Ethylene, ethane and light hydrocarbon recycle streams are separated in the deethanizer and ethylene rectification tower. Where ethylene...

Embodiment 2

[0034] use figure 1 In the process flow shown, the methanol raw material is industrial methanol. The methanol aromatization reactor adopts a fluidized bed reactor, the aromatization catalyst used is a modified ZSM-5 molecular sieve, and the zinc oxide content of the auxiliary agent is 10% by weight. The reaction temperature is 450°C, the pressure is 0.25MPAG, and the weight space velocity is 1.5HR -1 . The reaction product was separated into gas phase, oil phase and water phase after cooling to 40°C. The gas phase is firstly washed with water to remove oxygenated compounds in a water washing tower with a liquid-to-gas mass ratio of 3, and then the oxygenated compounds are further removed in a gas phase molecular sieve adsorber to obtain a light hydrocarbon stream, which is sent to the demethanizer, Separation into hydrogen, methane, ethylene, ethane and light hydrocarbon recycle streams in pressure swing adsorption unit, deethanizer and ethylene rectification tower. 50% of...

Embodiment 3

[0037] use figure 1 In the process flow shown, the methanol raw material is industrial methanol. The methanol aromatization reactor adopts a fluidized bed reactor, the aromatization catalyst used is a modified ZSM-5 molecular sieve, the zinc oxide content of the auxiliary agent is 10WT%, and the zinc nitrate content is 10WT%. The reaction temperature is 400°C, the pressure is 0.1MPAG, and the weight space velocity is 0.2HR -1 . The reaction product was separated into gas phase, oil phase and water phase after cooling to 40°C. The gas phase is firstly washed with water in a water washing tower to remove oxygenated compounds. The liquid-to-gas mass ratio of the water washing tower is 3.2. The light hydrocarbon stream after water washing is separated in the demethanizer, pressure swing adsorption unit, deethanizer and ethylene distillation tower Hydrogen, methane, ethylene, ethane and light hydrocarbon recycle streams. All of the ethylene is returned to the aromatization reac...

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Abstract

The invention relates to a method for preparing aromatic hydrocarbon by methyl alcohol, and mainly solves the problems of ethane accumulation and low aromatic hydrocarbon yield in a system for preparing the aromatic hydrocarbon by the methyl alcohol in the prior art. The method for preparing the aromatic hydrocarbon by the methyl alcohol comprises the following steps: 1) providing methyl alcohol raw material logistics, light hydrocarbon cycle logistics, C5 cycle logistics and methyl alcohol cycle logistics; 2) after the above four types of logics are mixed, obtaining reaction feedstock; 3) sending the reaction feedstock into an aromatization reactor to be in contact with a ZSM-5 molecular sieve catalyst to obtain a reaction product; 4) cooling and separating the cooling product to obtain agaseous phase, an oil phase and an aqueous phase; 5) separating the gaseous phase into hydrogen, fuel gas, ethylene and light hydrocarbon cycle logistics through a gas separation unit; 6) separatingthe oil phase into the C5 cycle logistics and an aromatic hydrocarbon product; 7) separating the aqueous phase into the methyl alcohol cycle logistics and wastewater through a methyl alcohol recoveryunit. According to the technical scheme, the above problem is favorably solved, and the method can be used for the industrial production of the preparation of the aromatic hydrocarbon by the methyl alcohol.

Description

technical field [0001] The invention relates to a method for preparing aromatics from methanol. technical background [0002] In recent years, with the increase of shale gas production in the United States, the trend of lightening raw materials for cracking units is obvious, and the production of aromatics has decreased, showing signs of a shortage of supply. On the other hand, oil supply is becoming increasingly tight, crude oil prices remain high, and the cost of raw materials for the production of aromatics through catalytic reforming of naphtha as raw material is rising. Due to the rich coal resources in my country, the production of aromatics from coal-based methanol raw materials has shown a certain price advantage and has been vigorously developed. The methanol-to-aromatics technology uses methanol as a raw material to produce aromatics through dehydrogenation, cyclization and other steps under the catalysis of a bifunctional (acidic and dehydrogenation) active catal...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C7/00C07C15/04C07C15/06C07C15/08C07C15/02
CPCC07C1/20C07C7/005C07C15/04C07C15/06C07C15/08C07C15/02Y02P30/20Y02P30/40
Inventor 金鑫杨卫胜胡帅
Owner CHINA PETROLEUM & CHEM CORP
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