System and process for preparing aromatic hydrocarbon by converting methanol or dimethyl ether

A technology for dimethyl ether and aromatic hydrocarbons, which is applied in the field of aromatic hydrocarbon production and can solve the problems of not considering recycling methods and the like

Active Publication Date: 2010-09-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] From the above analysis, it can be seen that so far, the research on the aromatization of methanol and dimethyl ether has mainly focused on the improvement of catalysts, except that the Shanxi Coal Chemical Institute has carried out a simple gas-liquid separation of the products of the aromatization pro...

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  • System and process for preparing aromatic hydrocarbon by converting methanol or dimethyl ether
  • System and process for preparing aromatic hydrocarbon by converting methanol or dimethyl ether
  • System and process for preparing aromatic hydrocarbon by converting methanol or dimethyl ether

Examples

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Effect test

Embodiment 1

[0119] Methanol enters the aromatization reactor 1 (the aromatization reactor adopts a fixed bed) to participate in the reaction under the action of Zn-ZSM-5 catalyst, the reaction temperature is 470°C, the reaction pressure is 0.05MPa, and the weight space velocity is 0.6hr -1 . The reacted material enters the gas-liquid-liquid separator 5 and is divided into gas phase products, oil phase products and water, and the gas phase products enter the light olefin aromatization reactor 2, the reactor is a fixed bed reactor, and the catalyst is Zn-ZSM -5 molecular sieve catalyst, the reaction temperature is 450°C, the reaction pressure is 0.1MPa, and the weight space velocity is 1hr -1 . The reacted material enters the gas-liquid separator 6 after being condensed and is divided into a gas phase product and an oil phase product, and the gas phase product enters the gas phase separator 7, and adopts the method of absorption and desorption to separate hydrogen, methane and other C 2 +...

Embodiment 2

[0121] Methanol enters the aromatization reactor 1 (the aromatization reactor adopts a fixed bed) to participate in the reaction under the action of Ag-ZSM-5 catalyst, the reaction temperature is 450°C, the operating pressure is 0.14MPa, and the weight space velocity is 0.7hr -1 . The reacted material enters the gas-liquid-liquid separator 5 and is divided into gas phase product, oil phase product and water, and the gas phase product enters directly into the gas phase separator 7. The mixture of benzene and toluene generated by the reaction is used as the absorbent, and the absorption temperature is 40 ℃, the absorption pressure is 2MPa. Hydrogen and methane are separated by membrane separation. Low-carbon hydrocarbons without hydrogen enter low-carbon hydrocarbon aromatization reactor 3 for aromatization reaction. The reactor is a fixed-bed reactor, the catalyst is Mo-ZSM-5 molecular sieve catalyst, and the reaction temperature is 600°C. Pressure is 1MPa, weight space veloc...

Embodiment 3

[0123] Methanol enters the aromatization reactor 1 (the aromatization reactor adopts a fluidized bed) and participates in the reaction under the action of Ga-P-ZSM-5 catalyst. The reaction temperature is 550°C, the reaction pressure is 0.5MPa, and the weight space velocity is 5 hours -1 . The reacted material enters the gas-liquid-liquid separator 5 and is divided into gas phase product, oil phase product and water. The gas-phase product that comes out from gas-liquid-liquid separator 5 directly enters gas-phase separator 7 to combine hydrogen and methane with C 2 +Low-carbon hydrocarbons are separated, and the gas phase separator 7 adopts a rectification method for separation. Hydrogen and methane are separated by pressure swing adsorption. C without hydrogen 2 + The low-carbon hydrocarbon stream enters the low-carbon hydrocarbon reactor 3 for aromatization. Low-carbon hydrocarbon aromatization reactor 3 is a fixed-bed reactor, the catalyst is Zn-P-ZSM-35 molecular sieve...

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Abstract

The invention relates to a system and a process for preparing aromatic hydrocarbon by converting methanol or dimethyl ether and belongs to the technical field of aromatic hydrocarbon production. The methanol or the dimethyl ether serving as a raw material firstly reacts in an aromatization reactor; a reaction product is separated; H2, methane, mixed C8 aromatic hydrocarbon and partial C9s + hydrocarbons serving as products are output from the system; and C2+ non-aromatic hydrocarbon and aromatic hydrocarbons except the mixed C8 aromatic hydrocarbon and the partial C9s + hydrocarbons are take as a circular material flow and return to corresponding reactors for further aromatization reaction. By separating and recycling the product obtained in the process of aromizing the methanol or the dimethyl ether, the system and the process improve the yield and selectivity of the aromatic hydrocarbon; and moreover, the process is flexible, and target products can be changed according to market demands.

Description

technical field [0001] The invention relates to a system and process for preparing aromatics by converting methanol or dimethyl ether, and belongs to the technical field of aromatics production. Background technique [0002] Aromatic hydrocarbons refer to hydrocarbons containing benzene rings. Triphenyl (benzene, toluene and xylene, also known as BTX) in aromatic hydrocarbons is the basic raw material of organic chemical industry and is widely used in synthetic fibers, synthetic resins, synthetic rubbers and various fine chemicals . At present, the source of aromatics is mainly from catalytic reforming process, naphtha cracking process, low-carbon hydrocarbon aromatization and aromatics conversion process in petrochemical industry; only a small part comes from coal tar in coal chemical industry, which is more dependent on petroleum Big. In recent years, the process of producing aromatics from coal-based methanol and dimethyl ether has also attracted attention, but it is st...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C15/00C07C2/00C07C6/12C07C15/067C07C15/04C07C15/06C07C9/04C07C7/11C01B3/26C01B3/52
CPCY02P20/52
Inventor 魏飞骞伟中汤效平黄晓凡杨伟恽忪
Owner TSINGHUA UNIV
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