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System and method of preparing paraxylene by alcohol/ether conversion

A technology for para-xylene and xylene, which is applied in the field of alcohol/ether conversion to prepare para-xylene, can solve problems such as economic impact, and achieve the effects of reducing investment, saving energy consumption, and shortening the process.

Active Publication Date: 2014-06-18
HUADIAN COAL IND GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method only considers the utilization of toluene, but a large amount of C is generated in the reaction process 9 The above hydrocarbons cannot be further utilized and can only be used as cheap aromatic oils, which affects the economics of the process

Method used

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  • System and method of preparing paraxylene by alcohol/ether conversion
  • System and method of preparing paraxylene by alcohol/ether conversion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The raw material is methanol with a purity of 85% (mass fraction) (the rest is water). After entering the alcohol / ether aromatization reaction system 1, a gas phase is generated under the action of a catalyst, water, non-aromatic hydrocarbons, benzene, toluene, C 8 Aromatics, C 9 Aromatics, C 10 Aromatics and other oil phase heavy aromatics and other oil phase components, the reacted product materials enter the gas-liquid-liquid three-phase separation device 2 to be separated into gas phase, water phase and oil phase products.

[0051] The gas phase product from the gas-liquid-liquid three-phase separation device 2 is separated into C 2 The above hydrocarbons, dry gas and hydrogen. where C 2 The above hydrocarbons enter alcohol / ether aromatization reaction system 1 as reactants, and a part of hydrogen enters toluene, C 9 Methyl aromatics, C 10 The disproportionation reaction device 7 of methyl aromatics, another part of hydrogen enters the xylene isomerization devi...

Embodiment 2

[0056] The raw material is methanol with a purity of 90% (mass fraction) (the rest is water). After entering the alcohol / ether aromatization reaction system 1, it will generate a gas phase under the action of a catalyst, water, non-aromatic hydrocarbons, benzene, toluene, C 8 Aromatics, C 9 Aromatics, C 10 Aromatics and other oil phase heavy aromatics and other oil phase components, the reacted product materials enter the gas-liquid-liquid three-phase separation device 2 to be separated into gas phase, water phase and oil phase products.

[0057] The gas phase product from the gas-liquid-liquid three-phase separation device 2 is separated into C 2 The above hydrocarbons, dry gas and hydrogen. where C 2 The above hydrocarbons enter alcohol / ether aromatization reaction system 1 as reactants, and a part of hydrogen enters toluene, C 9 Methyl aromatics, C 10 The disproportionation reaction device 7 of methyl aromatics, another part of hydrogen enters the xylene isomerization ...

Embodiment 3

[0062] The raw material is methanol with a purity of 95% (mass fraction) (the rest is water). After entering the alcohol / ether aromatization reaction system 1, it will generate a gas phase under the action of a catalyst, water, non-aromatic hydrocarbons, benzene, toluene, C 8 Aromatics, C 9 Aromatics, C 10 Aromatics and other oil phase heavy aromatics and other oil phase components, the reacted product materials enter the gas-liquid-liquid three-phase separation device 2 to be separated into gas phase, water phase and oil phase products.

[0063] The gas phase product from the gas-liquid-liquid three-phase separation device 2 is separated into C 2 The above hydrocarbons, dry gas and hydrogen. where C 2 The above hydrocarbons enter alcohol / ether aromatization reaction system 1 as reactants, and a part of hydrogen enters toluene, C 9 Methyl aromatics, C 10 The disproportionation reaction device 7 of methyl aromatic hydrocarbons, another part of hydrogen enters the xylene is...

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Abstract

The invention belongs to the field of craft processes of arene production devices, and particularly relates to a system and method of preparing paraxylene by alcohol / ether conversion. The system provided by the invention mainly consists of an alcohol / ether aromatization reaction device, a gas-liquid-liquid three phase separating device, a benzene fractional device, a paraxylene fractional device, an olefin-removing device, a paraxylene separating device and a paraxylene product tower. The yield of the paraxylene is increased by means of aromatization reaction of non-arene, alkylation reaction of benzene and disproportionated reaction of xylene and arene with more than 9 carbon atoms. By adopting an unclear separation technology of a product with less than 7 carbon atoms, an arene extraction system is canceled, the investment and energy consumption are greatly reduced, and gaseous phase hydrocarbon with more than 2 carbon atoms is fully utilized as a raw material of an alcohol / ether aromatization system. Hydrogen generated is used for disproportionation of C9 methyl arene and C10 methyl arene and isomerization reaction of C8 arene. The system and method have the advantages of self supply of raw materials, less investment, low energy consumption, short flow and high yield of paraxylene.

Description

technical field [0001] The invention belongs to the technical process field of aromatics production equipment, and in particular relates to a system and method for preparing p-xylene through alcohol / ether conversion. Background technique [0002] Methanol / dimethyl ether aromatization technology is an emerging aromatics production process. It uses methanol or dimethyl ether as a raw material and reacts on a metal-molecular sieve dual-function catalyst to generate benzene, toluene, xylene, trimethylbenzene, etc. Aromatic process. The current technology produces mostly mixed aromatics, but only p-xylene has a large demand and high price, while other products have relatively low prices and limited demand. Therefore, according to the characteristics of the methanol / dimethyl ether aromatization product itself and the market situation of the product, maximizing the production of p-xylene while greatly reducing the energy consumption of the separation and conversion process is the ...

Claims

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Application Information

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IPC IPC(8): C07C15/08C07C1/20C07C6/12C07C5/27
CPCY02P30/20Y02P30/40
Inventor 王彤汤效平骞伟中崔宇谢青魏飞高长平丁焕德梁彦鸿
Owner HUADIAN COAL IND GRP
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