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Three-tower device and method for recycling ethylene and ethane from dry gas through oil absorption

An oil absorption and absorption tower technology, which is applied in the field of catalytic cracking dry gas separation process, can solve the problems of limiting the application scope of the absorption method and the large investment of polymerization-grade ethylene, and achieves strong adaptability of raw materials, flexible absorption method, energy saving and low cost. effect of investment

Inactive Publication Date: 2015-09-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The methane content in the products obtained by the current absorption method is relatively high, and the product gas needs to be separated into the pyrolysis gas cryogenic separation system to obtain polymer grade ethylene, which greatly limits the application range of the absorption method
For companies without cryogenic demethanizers, the investment to obtain polymer grade ethylene becomes very large

Method used

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  • Three-tower device and method for recycling ethylene and ethane from dry gas through oil absorption
  • Three-tower device and method for recycling ethylene and ethane from dry gas through oil absorption
  • Three-tower device and method for recycling ethylene and ethane from dry gas through oil absorption

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Experimental program
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Effect test

Embodiment 1

[0026] The molar composition of feed gas 1 is 21.1% H 2 +24.5%N 2 +24.3%CH 4 +21%C 2 h 4 +7.8%C 2 h 6 +0.2C 3 h 6 +0.4%O 2 +0.6% CO, mass flow rate 7.5 tons / hr, temperature 40°C. C5 is used as absorbent in the process, and the amount of recycled absorbent is 20 tons / hr.

[0027]The compressor 2 compresses the raw material gas 1 to 3.05Mpa, the raw material primary cooler 4 cools the compressed gas 3 to 32°C, and the raw material secondary cooler 6 cools the absorption liquid 12, the primary cooling gas 5, and the desorption gas 11 to -15°C. The separation tank 8 is adiabatically flashed at 3.05MPa. Absorption tower 29 has 12 theoretical plates, and its operating pressure is 3 MPa; desorption tower 13 has 10 theoretical plates, and its operating pressure is 3.05 MPa. The preheater 15 preheats the desorption liquid 14 to 132°C. The rectification column 17 has a theoretical plate number of 20, an operating pressure of 2.6 MPa, a reflux ratio of 2, and preheating liqu...

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Abstract

The invention relates to a three-tower device and method for recycling ethylene and ethane from dry gas through oil absorption. The method comprises the following steps: pressurizing and cooling the dry gas through a compressor, mixing the dry gas with rich liquid from an absorption tower and desorbed gas from a desorption tower, enabling the mixture to enter a heat exchanger for cooling so as to enable the temperature of the mixture to reach absorbent temperature; enabling the mixture to enter a flash drum for single flash, and enabling a gas phase used as a gas phase feeding material of the absorption tower to enter from the tower bottom; enabling a liquid phase used as a feeding material of the desorption tower to enter from the tower top; refining products at the bottom of the desorption tower through a rectifying tower so as to obtain the products of ethylene and ethane; enabling the products at the bottom of the rectifying tower to be supplemented and cooled, and then returned to the rectifying tower top to be used as an absorbent. An intercondenser is arranged in the absorption tower, so that heat generated can be absorbed timely. According to the invention, the contents of methane and other light components are adjusted through the desorption tower, the content of the methane is 0.05% lower than that of the ethylene and polymer grade ethylene can be obtained directly from an ethylene tower. The method provided by the invention is suitable for separating and recycling C2 component from catalytic cracking dry gas and has the high potential of replacing a deep-cooling method.

Description

technical field [0001] The present invention relates to catalytic cracking dry gas separation process, especially relates to oil absorption process to recover ethylene, ethane equipment and method, its main feature is that the product can directly enter the deethanizer tower to obtain polymer grade ethylene. belongs to chemical technology. Background technique [0002] Catalytic cracking dry gas is a large amount of gas produced in the process of petroleum refining, and its main components include hydrogen, nitrogen, oxygen, methane, ethylene, ethane, etc. In most cases, due to the lack of dry gas recovery means, the dry gas is directly burned as fuel gas. This is a great waste of valuable gases represented by ethylene and ethane. At the same time, with the continuous development of catalytic cracking processes that produce more olefins, the amount of dry gas and its ethylene content are increasing. Therefore, it is very important to recover dry gas, especially the ethyle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C7/00C07C7/11C07C7/04C07C9/06C10G70/04
CPCC07C7/04C07C7/11C07C9/06C07C11/04C10G70/04Y02P30/40
Inventor 李鑫钢王珏陈超李优李永红
Owner TIANJIN UNIV
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