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A method for separating ethylene cracked gas by full temperature range pressure swing adsorption

A technology of pressure swing adsorption and ethylene cracking, which is applied in the fields of adsorption purification/separation, distillation purification/separation, organic chemistry, etc. It can solve the problems that huge energy cannot be effectively used, and achieves little temperature change, high separation efficiency, and high throughput. Reduced effect

Active Publication Date: 2020-09-01
SICHUAN TECHAIRS
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only a series of rectification processes are improved, but the huge energy carried by the ethylene cracking gas itself cannot be effectively utilized and the rectification separation principle itself is limited. These improvements and innovations still cannot change the existing ethylene cracking gas separation process. Operational energy consumption and high production costs remain high

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  • A method for separating ethylene cracked gas by full temperature range pressure swing adsorption

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] like figure 1 As shown, a separation method of ethylene cracking gas full temperature range pressure swing adsorption (FTrPSA), the following operations are performed in sequence:

[0038] 1) Pretreatment process:

[0039] The ethylene cracking gas raw material gas produced from the ethylene cracking furnace with a temperature of 700~900°C goes through a pretreatment process consisting of initial cooling of heavy oil and heavy hydrocarbons, pressurization, alkali washing, and drying, and the temperature is lowered to 70 ~100℃, pressure 3.0~4.0MPa, enter the next step of medium and high temperature pressure swing adsorption concentration process;

[0040] In this process, in addition to drying and lowering the temperature, unreacted naphtha, water, and heavy by-products generated by steam cracking reactions contained in the ethylene cracking gas must be condensed and dried.

[0041] 2) Medium and high temperature pressure swing adsorption concentration process:

[004...

Embodiment 2

[0055] like figure 1 As shown, a separation method of ethylene cracking gas full temperature range pressure swing adsorption (FTrPSA), the following operations are performed in sequence:

[0056] The ethylene cracking gas raw material gas produced from the ethylene cracking furnace with a temperature of 700~900 °C goes through a pretreatment process consisting of initial cooling of heavy oil and heavy hydrocarbons, pressurization, alkali washing, and drying, and the temperature is lowered to 120 ~150°C, pressure 2.0~3.0MPa, enter the medium-high temperature pressure swing adsorption concentration process, adopt 10 adsorption towers in series, 3 towers are always adsorbing, and the remaining 7 towers are in the desorption regeneration step, alternate cycle operation, the operating temperature is 120~150℃, operating pressure 2.0~3.0MPa, normal pressure or vacuum desorption, the concentrated gas rich in ethylene and propylene flowing out from the bottom of the tower, after pressu...

Embodiment 3

[0058] like figure 1 As shown, a separation method of ethylene cracking gas full temperature range pressure swing adsorption (FTrPSA), the following operations are performed in sequence:

[0059] The ethylene cracking gas raw material gas produced from the ethylene cracking furnace with a temperature of 700~900°C goes through a pretreatment process consisting of initial cooling of heavy oil and heavy hydrocarbons, pressurization, alkali washing, and drying, and the temperature drops to 170 ~200℃, the pressure is 0.03~1.0MPa, enters the middle and high temperature pressure swing adsorption concentration process, adopts 10 adsorption towers in series, 3 towers are always adsorbing, and the remaining 7 towers are in the desorption regeneration step, alternate cycle operation, the operating temperature is 170~200℃, operating pressure 0.03~1.0MPa, normal pressure or vacuum desorption, the concentrated gas rich in ethylene and propylene flowing out from the bottom of the tower, afte...

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Abstract

The invention discloses a separation method of ethylene cracking gas through full temperature range-pressure swing adsorption and relates to the technical field of preparation of ethylene, propylene, hydrogen and the like and gas separation through pressure-swing adsorption. The separation method disclosed by the invention solves the problems existing in a sequential ethylene cracking gas separation (cryogenic distillation) method that the self energy of raw material gas cannot be fully utilized, the energy consumption in the separation process is higher, the product and recovery component purity or the yield are lower, and the like, and changes that a traditional pressure-swing adsorption method is only limited to the auxiliary effect of refined purification of ethylene tail gas and becomes basic separation unit operation as equally important as cryogenic distillation separation.

Description

technical field [0001] The invention belongs to the field of ethylene cracking gas separation, and more specifically relates to a method for separating ethylene cracking gas by full-temperature pressure swing adsorption. Background technique [0002] Ethylene is the most important basic raw material in petrochemical industry. A series of products can be obtained from ethylene, such as polyethylene, ethylene propylene rubber, ethylene oxide, ethylbenzene, polyvinyl chloride and so on. Raw materials for ethylene production include natural gas, refinery dry gas, methanol, and various fractions of crude oil. In my country, the raw materials for ethylene cracking units are mainly distillates of crude oil, among which straight-run gasoline (also known as naphtha) in light oil is dominant. C2 and above (C2+) saturated hydrocarbons and naphtha are used as raw materials to produce ethylene by steam pyrolysis in an ethylene cracking furnace. The temperature of the ethylene cracked g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C11/06C07C9/06C07C7/12C07C7/04
CPCC07C7/04C07C7/12C07C11/04C07C11/06C07C9/06
Inventor 刘开莉陈运钟雨明蔡跃明
Owner SICHUAN TECHAIRS
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