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Method and device for preparing aromatics through methane aromatization

A technology for aromatization and methane aroma, which is applied in chemical instruments and methods, condensation hydrocarbon production with dehydrogenated hydrocarbons, chemical recovery, etc., and can solve the problems of high technical difficulty, increased heat supply difficulty, and large equipment investment. , to achieve the effect of reducing the difficulty of separation technology, reducing equipment investment and saving equipment investment

Active Publication Date: 2009-11-18
PETROCHINA CO LTD +1
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  • Claims
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Problems solved by technology

Wherein one of the main technical bottlenecks of engineering difficulty is that due to thermodynamic equilibrium limitation, the single-pass conversion rate of the aromatization reaction carried out at 600-700 °C is low (about 16%), and the generated gas contains about 22% hydrogen and 78% methane
If methane is reused, hydrogen and methane need to be separated, which not only consumes high energy, but also is technically difficult
At the same time, the independent methane aromatization process has a long route and a large investment in equipment, which is difficult to realize
Further increasing the aromatization temperature has a limited effect on improving the methane conversion rate, and there is still the problem of hydrogen and methane separation.
And raising the reaction temperature will increase the severity of equipment material requirements, and it will be more difficult to supply heat for the (endothermic) reaction, and it will be more difficult to match the catalyst regeneration temperature with the aromatization temperature, which will bring a series of Complex engineering issues such as process switching and heating and cooling operations and high energy consumption

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  • Method and device for preparing aromatics through methane aromatization
  • Method and device for preparing aromatics through methane aromatization

Examples

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Effect test

Embodiment 1

[0040] Use the above figure 1 The shown system converts methane to steam (using a nickel-based catalyst, reacting steam with methane at 850°C and a pressure of 2 MPa to produce synthesis gas, with a water-to-carbon ratio of 3 and a methane space velocity of 5000h -1 ) 10% of the raw gas in system 1 is used for methane aromatization reaction. The purification unit (using zinc oxide type purification agent, purification temperature is 400 ℃, methane space velocity is 3000h -1 ) After 1b, the pure methane gas is decompressed to 0.15MPa by 2a, and then passed into the fluidized bed reactor of aromatization reaction unit 2b (indirectly heated by the high temperature flue gas of methane steam reforming system 1) at 700℃ Lower reaction (using a catalyst containing 6% Mo, 0.5% W30% ZSM-11 molecular sieve (reinforcing aid is aluminum oxide), methane space velocity is 1 g / g catalyst / hour). The deactivated catalyst is continuously transported to the fluidized bed reactor in the catalyst reg...

Embodiment 2

[0042] use figure 1 The combined system shown is the methane steam reforming system 1 (using a nickel-based catalyst, the steam and methane are reacted at 1200℃ and the pressure is 2MPa to produce synthesis gas, the water-to-carbon ratio is 2.8, and the methane space velocity is 6000h -1 30% of the raw material gas in) is used for methane aromatization reaction. The purification unit 1b (using zinc oxide type purification agent, purification temperature is 350 ℃, methane space velocity is 1000h -1 After 2a, the pure methane gas was decompressed to 0.2MPa, and then passed into the moving bed reactor of the aromatization reaction unit 2b (indirectly heated by the high-temperature flue gas of the methane steam reforming system 1), and reacted at 760℃ (Use a catalyst containing 6% Mo, 2% V, 45% MCM22 molecular sieve (reinforcing aid is silica), methane space velocity is 1.5 g / g catalyst / hour). Continuously transport the deactivated catalyst to the moving bed reactor in the catalyst r...

Embodiment 3

[0044] use figure 2 The shown combined system converts methane to steam (using a nickel-based catalyst, reacting steam with methane at 820°C and a pressure of 2MPa to produce synthesis gas, with a water-to-carbon ratio of 3 and a methane space velocity of 10000h -1 ) 50% of the raw gas in system 1 is used for methane aromatization reaction. After purification unit 1b (using zinc oxide type purifier, purification temperature is 300-400℃, methane space velocity is 3000h -1 ) The pure methane gas is reduced to 0.16MPa by 2a, and then passed into the fluidized bed reactor of the aromatization reaction unit 2b (indirectly heated by the high-temperature flue gas of the methane steam reforming system 1) for reaction at 760℃ (Use a catalyst containing 6% Mo, 0.05% Ni, 50% SAPO-34 molecular sieve (reinforcement aid is aluminum oxide), methane space velocity is 3 g / g catalyst / hour). The deactivated catalyst is continuously transported to the fluidized bed reactor in the catalyst regeneratio...

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Abstract

The invention relates to a method and a device for preparing aromatics through methane aromatization. A methane aromatization system and a methane steam conversion system are combined; qualified raw material gas is supplied to the methane aromatization system by utilizing a purification unit of the methane steam conversion system; heat is supplied to the methane aromatization system by utilizing high-temperature waste gas of the methane steam conversion system; tail gas (methane and hydrogen) produced by the methane aromatization system is directly used as a raw material or fuel of the methane steam conversion system without separation. The method and the device have the advantages of effectively solving the technical problem of separating methane and hydrogen during independent aromatization, effectively utilizing the high-temperature heat source of methane steam conversion processes, reducing the proportion of heat supply gas from 30 percent of the amount of reaction gas to below 5 percent, shortening process, reducing investment, reducing energy consumption and greatly reducing the cost for preparing aromatic hydrocarbon.

Description

Technical field [0001] The invention relates to a method and equipment for preparing aromatic hydrocarbons by methane aromatization. technical background [0002] Benzene and other aromatic products are important basic chemical raw materials and are currently by-products mainly through the petroleum refining process. Recently, as the global crude oil prices continue to rise and the demand for aromatics downstream products increases, the prices of benzene and other aromatics remain high. Due to the shortage of petroleum resources in my country, there is a large demand gap for vehicle oil (gasoline, diesel, kerosene and lubricating oil, etc.), and strong demand for ethylene, propylene, butadiene, etc., so the production of aromatics from petroleum routes is increasingly restricted. In order to meet the rapid increase in the demand for benzene and other aromatics in the production of various chemical and chemical products in my country, it is very necessary to find suitable non-petr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/76C01B3/22
CPCY02P20/584
Inventor 骞伟中杨吉红魏飞雍瑞生魏彤朱建设黄河田涛孙玉建
Owner PETROCHINA CO LTD
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