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Integrated system and method used for preparing aromatic hydrocarbons from methyl alcohol

A technology for aromatics and methanol, which is applied in the field of integrated systems for producing aromatics, can solve the problems of high energy consumption, complex process flow, and failure to realize the reuse of heavy aromatics, so as to reduce coking rate, save investment and energy consumption, and prolong service life cycle effect

Active Publication Date: 2014-07-23
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process has the advantages of high yield of aromatics, flexible system operation, and realizes the reuse of low-carbon gaseous hydrocarbons, but does not realize the 9 + Reuse of Heavy Aromatics
Tsinghua University disclosed a system and process for producing aromatics from methanol or dimethyl ether in CN101823929A, which realizes non-aromatic and C by-products in the MTA process. 9 + The reuse of heavy aromatics effectively increases the yield of aromatics, but the process is complicated and energy consumption is high

Method used

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  • Integrated system and method used for preparing aromatic hydrocarbons from methyl alcohol
  • Integrated system and method used for preparing aromatic hydrocarbons from methyl alcohol

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The methanol aromatization reactor adopts a fixed bed reactor, and the controlled reaction conditions are: temperature 360°C, pressure 2.0MPa, methanol WHSV=1.0h -1 , Circulation gas: methanol = 6 (molar ratio), the catalyst uses Ga / Zn-ZSM-5 molecular sieve catalyst, based on the catalyst, the Ga content is 1.0%, and the Zn content is 0.5%. The liquefied gas aromatization reactor adopts a fixed-bed reactor, and the controlled reaction conditions are: temperature 450°C, pressure 0.5MPa, raw material WHSV=1.0h -1 , the catalyst uses Ga / Ce-ZSM-5 molecular sieve catalyst, based on the catalyst, the Ga content is 1.5%, and the Ce content is 0.5%. The transalkylation reactor adopts a fixed bed reactor, and the controlled reaction conditions are: temperature 220°C, pressure 1.2MPa, raw material WHSV=1.0h -1 , the catalyst is Mo / Ni-Y molecular sieve catalyst, based on the catalyst, the Mo content is 1.5%, and the Ni content is 1.0%. Under the above process conditions, the yie...

Embodiment 2

[0038] The methanol aromatization reactor adopts a moving bed reactor, and the controlled reaction conditions are: temperature 420°C, pressure 0.2MPa, methanol WHSV=1.5h -1 , Circulation gas: methanol = 3 (molar ratio), the catalyst uses Ga / Ni-ZSM-5 molecular sieve catalyst, based on the catalyst, the Ga content is 2.0%, and the Ni content is 1.0%. The liquefied gas aromatization reactor adopts a moving bed reactor, and the controlled reaction conditions are: temperature 500°C, pressure 0.2MPa, raw material WHSV=0.8h -1 , the catalyst uses Ga / Fe-ZSM-5 molecular sieve catalyst, based on the catalyst, the Ga content is 3.0%, and the Fe content is 2.0%. The transalkylation reactor adopts a fixed bed reactor, and the controlled reaction conditions are: temperature 300°C, pressure 1.8MPa, raw material WHSV=0.7h -1 , the catalyst adopts Mo / La-Y molecular sieve catalyst, based on the catalyst, the Mo content is 3.0%, and the La content is 0.3%. Under the above process conditions, t...

Embodiment 3

[0040] The methanol aromatization reactor adopts a fluidized bed reactor, and the controlled reaction conditions are: temperature 480°C, pressure 0.2MPa, methanol WHSV=2.0h -1 , the catalyst adopts Ga / La-ZSM-5 molecular sieve catalyst, based on the catalyst, the Ga content is 3.0%, and the La content is 1.0%. The liquefied gas aromatization reactor adopts a fluidized bed reactor, and the controlled reaction conditions are: temperature 550°C, pressure 0.2MPa, raw material WHSV=1.5h -1 , the catalyst adopts Ga / Zn-ZSM-5 molecular sieve catalyst, based on the catalyst, the Ga content is 3.0%, and the Zn content is 1.0%. The transalkylation reactor adopts a fixed bed reactor, and the controlled reaction conditions are: temperature 350°C, pressure 2.0MPa, raw material WHSV=1.2h -1 , the catalyst uses Mo / Co-Y molecular sieve catalyst, based on the catalyst, the Mo content is 3.0%, and the Co content is 2.0%. Under the above process conditions, the yields of each product are shown i...

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Abstract

The invention belongs to the technical field of aromatic hydrocarbon production, and specifically relates to an integrated system and a method used for preparing aromatic hydrocarbons by taking methyl alcohol as a raw material. The method comprises following steps: methyl alcohol is delivered through an aromatization reactor so as to obtain mixed hydrocarbons rich in aromatic hydrocarbons; the mixed hydrocarbons are separated so as to obtain C1-2 hydrocarbons, C3-4 hydrocarbons, C5+ non-aromatic hydrocarbons, BTX, and C9+ heavy aromatic hydrocarbons; C1-2 hydrocarbons, C5+ non-aromatic hydrocarbons and BTX are discharged as products, C3-4 hydrocarbons are subjected to aromatization for a second time, an obtained material is directly mixed with C9+ heavy aromatic hydrocarbons, and an obtained mixture is taken as a raw material and is delivered into an alkyl transfer reactor; an obtained reaction product is delivered back to a separation tower, and a less amount of C9+ heavy aromatic hydrocarbons is discharged via rectifying tower bottom pipelines. The invention also discloses the integrated system used for preparing aromatic hydrocarbons by taking methyl alcohol as the raw material. According to the method, methyl alcohol aromatization, liquefied gas aromatization, and heavy aromatic hydrocarbon lightening are combined, so that recycle of liquefied gas and recycle of heavy aromatic hydrocarbons are realized, cost and energy consumption are saved, catalyst service cycle is prolonged, and BTX yield is increased greatly.

Description

technical field [0001] The invention belongs to the technical field of aromatics production, and specifically relates to an integrated system and process method for preparing aromatics from methanol. Background technique [0002] Aromatics are important petrochemical basic raw materials, especially BTX (benzene, toluene and xylene), which are widely used in the synthetic industry of rubber, plastics and resins. In 2010, my country's BTX output was about 14.2 million tons, while the apparent consumption was about 19 million tons, and the gap between supply and demand reached 4.8 million tons. With the development of my country's polyester and other industries, it is expected that the demand for BTX will continue to grow at a high speed. At present, domestic aromatics resources basically come from the petrochemical industry, such as catalytic reforming process, naphtha cracking process, low-carbon hydrocarbon aromatization process and aromatics conversion process, etc. The r...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C15/04C07C15/06C07C15/08C07C6/12C07C15/067
CPCY02P20/52
Inventor 王银斌于海斌臧甲忠郭春垒舒畅张雪梅成宏南军汪洋李滨
Owner CHINA NAT OFFSHORE OIL CORP
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