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Method and device for preparing aromatics through methane aromatization

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

Active Publication Date: 2012-10-17
PETROCHINA CO LTD +1
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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 In the system shown, steam reforming of methane (using a nickel-based catalyst, reacting steam with methane at 850°C and a pressure of 2MPa to produce synthesis gas, the water-to-carbon ratio is 3, and the space velocity of methane is 5000h -1 ) 10% feed gas in system 1 for methane aromatization reaction. The purification unit (using zinc oxide type purification agent, the purification temperature is 400°C, and the space velocity of methane is 3000h -1 ) The pure methane gas after 1b is decompressed to 0.15MPa through 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) at 700°C Down reaction (using the catalyst containing 6% Mo, 0.5% W30% ZSM-11 molecular sieve (strengthening aid is aluminum oxide), methane space velocity is 1 g / g catalyst / hour). The deactivated catalyst is continuously transported to the fluidized be...

Embodiment 2

[0042] use figure 1 In the combined system shown, the methane-steam reforming system 1 (using a nickel-based catalyst, reacts steam and methane at 1200°C and a pressure of 2MPa to produce synthesis gas, the water-to-carbon ratio is 2.8, and the space velocity of methane is 6000h -1 ) in 30% feed gas for methane aromatization reaction. The purification unit 1b (using zinc oxide type purification agent, the purification temperature is 350°C, and the space velocity of methane is 1000h -1 ) after the pure methane gas is decompressed to 0.2MPa through 2a, 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°C (using 6% Mo, 2% V, the catalyst of 45% MCM22 molecular sieve (reinforcing aid is silicon dioxide), methane space velocity is 1.5 g / g catalyst / hour). The deactivated catalyst is continuously transported to the moving bed reactor in the ...

Embodiment 3

[0044] use figure 2 The combined system shown is to convert methane to steam (using a nickel-based catalyst, react steam and methane at 820°C and a pressure of 2MPa to produce synthesis gas, the water-to-carbon ratio is 3, and the space velocity of methane is 10000h -1 ) 50% feed gas in system 1 for methane aromatization reaction. Unit 1b after purification (using zinc oxide type purifier, purification temperature is 300-400°C, methane space velocity is 3000h -1 ) of pure methane gas is decompressed to 0.16MPa through 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) and reacted at 760°C (using 6% Mo, 0.05% Ni, the catalyst of 50% SAPO-34 molecular sieve (enhancing additive 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 regeneration un...

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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 through aromatization of methane. technical background [0002] Benzene and other aromatic products are important basic chemical raw materials, and currently they are mainly by-products in the petroleum refining process. Recently, as the global crude oil price continues to rise and the demand for aromatics downstream products increases, the prices of benzene and other aromatics remain high. my country's petroleum resources are short, there is a large demand gap for vehicle oil (gasoline, diesel, kerosene and lubricating oil, etc.), and the demand for ethylene, propylene, butadiene is strong, so the production of aromatics from petroleum routes is increasingly restricted. In order to meet the sharp 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 a suitable non-...

Claims

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Application Information

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Patent Type & Authority Patents(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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