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Method for producing aromatics by mixing light hydrocarbons

A technology for light hydrocarbons and aromatics, which is applied in the field of mixing light hydrocarbons to produce aromatics, can solve the problem of high energy consumption in ethylene recovery and utilization, and achieve the effects of reducing investment and energy consumption, reducing energy consumption, and avoiding accumulation

Active Publication Date: 2020-10-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is the high energy consumption of ethylene recovery and utilization in mixed light hydrocarbon raw materials in the prior art, and a new method for producing aromatics from mixed light hydrocarbons is provided

Method used

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  • Method for producing aromatics by mixing light hydrocarbons

Examples

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Effect test

Embodiment 1

[0030] The temperature of the light hydrocarbon raw material is 40°C, the pressure is 1.5 MPa, and the volume fraction composition is as follows: hydrogen 54%, methane 8%, carbon 2 12%, carbon 3 and above 26%. The mass content of aromatics in the light hydrocarbon raw material is 4.9%. After the light hydrocarbon raw material is cooled to 10°C in the heat exchanger, it is separated into hydrogen-rich gas and hydrogen-poor liquid in the gas-liquid separator. At this time, the content of aromatics in the hydrogen-rich gas is 180PPM (volume content). The hydrogen-rich gas is separated into a hydrogen product and a dehydrogenation stream through the PSA pressure swing adsorption separation unit. The dehydrogenation stream is pressurized to 0.3MPa by a compressor. The hydrogen-depleted liquid is separated in the depentanizer into a deheavy stream and a first aromatics stream. The operating pressure of the depentanizer is 0.6MPa, the temperature at the top of the tower is 60°C, a...

Embodiment 2

[0032] Using the same light hydrocarbon raw material, process flow and operating conditions as in Example 1, only the temperature of the light hydrocarbon raw material heat exchanger in the cooling and separation unit I was changed to 5°C. The content of aromatics in the hydrogen-rich gas is 120PPM (volume content). The energy consumption of this embodiment is 394kg standard oil / ton of aromatics.

Embodiment 3

[0034] Using the same light hydrocarbon raw material, process flow and operating conditions as in Example 1, only the temperature of the light hydrocarbon raw material heat exchanger in the cooling and separation unit I was changed to 20°C. The content of aromatics in the hydrogen-rich gas is 360PPM (volume content). The energy consumption of this embodiment is 381kg standard oil / ton of aromatics. But the stable operating time of the PSA pressure swing adsorption separation unit is only 93% of that of Example 1.

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Abstract

The invention relates to a method for preparing an aromatic hydrocarbon from a mixed light hydrocarbon. In the prior art, the energy consumption for recycling ethylene in the mixed light hydrocarbon raw material is high. A purpose of the present invention is mainly to solve the problem in the prior art. The technical scheme of the present invention comprises that 1) a light hydrocarbon raw material is subjected to cooling separation to obtain hydrogen-rich gas and a hydrogen-depleted liquid; 2) the hydrogen-rich gas is separated by a dehydrogenation unit to obtain hydrogen and a dehydrogenation stream; 3) the hydrogen-depleted liquid is subjected to rectification separation to obtain a heavy removing stream and a first aromatic hydrocarbon stream; 4) the methane removing stream and the heavy removing stream are converged, and the converged stream is fed into a light hydrocarbon aromatization reactor, and is converted into an aromatization product; 5) the aromatization product is subjected to cooing separation to obtain a gas phase product and a second aromatic hydrocarbon stream; 6) the gas phase product is compressed, and the compressed product is fed into an ethane removing towerto obtain fuel gas and a circulation stream; and 7) the circulation stream returns the light hydrocarbon aromatization reactor. With the technical scheme, the problem in the prior art is well solved.The method of the present invention can be used in the industrial production of light hydrocarbon aromatization.

Description

technical field [0001] The invention relates to a method for producing aromatic hydrocarbons by mixing light hydrocarbons. [0002] technical background [0003] Light hydrocarbon aromatization technology is a new type of petroleum processing technology developed in the past 20 years. It is characterized by the use of modified zeolite molecular sieve catalysts to directly convert low-molecular hydrocarbons such as liquefied gas, top oil, etc. into BTX or gasoline, etc. light aromatics. ZSM-5 molecular sieve has been widely used in industry due to its special shape selectivity, good hydrothermal stability and strong anti-carbon deposition ability. On the catalyst with ZSM-5 zeolite as the main active component, low-molecular alkanes or alkenes can be directly converted into aromatics, and there is no requirement for the latent content of aromatics in raw materials. Taking advantage of this feature, a number of light hydrocarbon aromatization industrial technologies have been...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/76C07C15/04C07C15/06C07C15/08
CPCC07C2/76C07C15/04C07C15/06C07C15/08
Inventor 金鑫胡帅
Owner CHINA PETROLEUM & CHEM CORP
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