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Method for separating ethane and ethylene in mixed gas

A separation method and mixed gas technology, applied in the purification/separation of hydrocarbons, chemical instruments and methods, absorption purification/separation, etc., can solve the problems of increased energy consumption and achieve excellent thermal conductivity and good separation effect

Active Publication Date: 2014-12-03
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the cryogenic separation of cracked gas, adding an absorbent to the demethanizer can prevent the tower from using a low temperature (-100°C or lower), but the tower still is also prone to polymerization of olefins and alkynes due to the increase in temperature. Blockage, and increased energy consumption due to the addition of a large amount of absorbent

Method used

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  • Method for separating ethane and ethylene in mixed gas
  • Method for separating ethane and ethylene in mixed gas
  • Method for separating ethane and ethylene in mixed gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a method for separating ethane and ethylene in a mixed gas, which adopts such as figure 2 The experimental setup is shown. This device is the device recorded in CN101377478A, and only a simple modification has been made to it in the present embodiment, and a balance kettle 215 has been added to the air intake line of the high-pressure sapphire kettle 202. The balance kettle has a volume of 112mL and a maximum working pressure of 40MPa.

[0043] Before starting the experiment, first unload the sapphire kettle 202, rinse it with distilled water, and then wash it with deionized water until no water drops hang on the wall of the kettle, then add a certain quality of MOF material and solvent into the sapphire kettle 202, mix and stir evenly The high-pressure sapphire kettle 202 is fastened in the constant temperature air bath 201; the vacuum pump and the three-way valve 212 are used to vacuum the sapphire kettle 202, the balance kettle 215 and the ...

Embodiment 2

[0081] This embodiment provides a method for separating ethane and ethylene in the mixed gas, which is carried out by using the device and experimental method of Embodiment 1. Add 3g of ZIF-8 material to 10mL of water to form a suspension slurry. The experimental results of separating the mixed gas 1 are shown in Table 3, and the experimental temperature is 293.15K. It can be seen from the experimental results that after absorption-adsorption separation, the C2 component (C 2 h 6 and C 2 h 4 ) is enriched in the suspension slurry phase, and compared with the dry ZIF-8 material in Example 1, the equilibrium constant of the C2 component increases slightly, and CH in the suspension slurry 4 and N 2 It can be seen that compared with dry ZIF-8, the separation method of the present invention can separate the mixed gas containing C2 components more effectively.

[0082] table 3

[0083]

Embodiment 3

[0085] This embodiment provides a method for separating ethane and ethylene in the mixed gas, which is carried out by using the device and experimental method of Embodiment 1. Add 3g of ZIF-8 material to 10mL of water to form a suspension slurry. The experimental results of separating the mixed gas 2 are shown in Table 4, and the experimental temperature is 293.15K. It can be seen from the composition of the mixed gas 2 that it is similar to the composition of the equilibrium gas phase obtained in Example 2, so this example can be used as a secondary separation application example of the separation method of the present invention. It can be seen from the experimental results that after absorption-adsorption separation, the C2 component (C 2 h 6 and C 2 h 4 ) is enriched in the suspension slurry phase, the equilibrium constant of the C2 component reaches 5.06, and the corresponding recovery rate is 65.27%. It can be seen that the C in the mixed gas can be efficiently separa...

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Abstract

The invention relates to a method for separating ethane and ethylene in mixed gas. The method comprises the steps of contacting the mixed gas with suspension seriflux with metal-organic framework materials so as to obtain the suspension seriflux adsorbed with ethane and ethylene; carrying out air lift on the suspension seriflux adsorbed with ethane and ethylene by utilizing C2 mixed gas so as to obtain the suspension seriflux replaced through air lift and replaced mixed gas; and desorbing the suspension seriflux replaced through air lift so as to obtain the ethane and the ethylene. According to the method, the ethane and ethylene in the mixed gas are effectively recovered through superimposed effect of absorption of solvent in the suspension seriflux and adsorption of the metal-organic framework material (MOF (maximum observed frequency) material) as well as the air lift replacement effect of the C2 mixed gas.

Description

technical field [0001] The invention relates to a method for separating ethane and ethylene in mixed gas, belonging to the field of chemical separation. Background technique [0002] Pyrolysis gas is the gaseous product of petroleum hydrocarbon cracking, which contains many lower hydrocarbons, mainly methane, ethylene, ethane, propylene, propane and C4, C5, C6 and other hydrocarbons. In addition, it also contains hydrogen and a small amount of impurities, such as hydrogen sulfide, carbon dioxide, moisture, alkynes, carbon monoxide, etc. The specific composition of cracked gas varies with cracking raw materials, cracking methods and cracking conditions. [0003] In order to obtain high-purity single hydrocarbons, such as important basic organic raw materials such as ethylene and propylene, it is necessary to separate them from other hydrocarbons and impurities, and to achieve a certain purity according to industrial needs. One operation process is called separation of crack...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/11C07C7/12C07C7/00C07C9/06C07C11/04
Inventor 刘蓓陈光进刘煌孙长宇汪进张晓欣王博王浩肖鹏
Owner CHINA UNIV OF PETROLEUM (BEIJING)