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High-selectivity decarbonization absorbent adopting physical method

A high-selectivity, absorbent technology, used in chemical gas separation and purification, coal combustion, and petroleum fields, can solve problems such as unreported, lower combustion calorific value, slow combustion speed, etc., to achieve good separation effect and improve selectivity. , the effect of improving the absorption and mass transfer rate

Active Publication Date: 2014-10-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon dioxide gas will reduce the combustion calorific value and slow down the combustion speed. In addition, a large amount of useless carbon dioxide gas will increase the energy consumption of compression and transportation
[0008] Therefore, the novel composite absorbent involved in the present invention is applied to the separation and purification of carbon dioxide, which has not been reported so far.

Method used

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  • High-selectivity decarbonization absorbent adopting physical method
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  • High-selectivity decarbonization absorbent adopting physical method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] a) add 20g containing 75wt% [bmim] [BF 4 ], vacuumize both the gas buffer tank and the absorption tank, control the temperature of the water bath to 30°C and 40°C respectively, control the stirring rate to 200rpm, close the valve between the absorption tank and the gas buffer tank, and keep the absorption tank in vacuum. Pour a certain amount of methane gas into the gas buffer tank to make the pressure reach 1MPa, and preheat for 1 hour. After the preheating is over, open the valve between the absorber and the gas buffer tank and then close it quickly. After closing the valve, record the pressure drop change of the absorber continuously for 10 minutes, and record the final pressure after the pressure in the absorber is balanced.

[0018] b) The Henry coefficient of methane gas in the absorbent is calculated according to the thermodynamic model, and the liquid phase mass transfer coefficient of methane gas in the absorbent is calculated according to the kinetic model. T...

Embodiment 2

[0022] a) Add 20g of absorbent containing 75wt% [bmim][DCA] to the absorption kettle, vacuum the gas buffer tank and the absorption kettle, control the temperature of the water bath at 30°C, 40°C, control the stirring rate at 200rpm, close the absorption kettle and the gas The valve between the buffer tanks keeps the absorber in vacuum, injects a certain amount of carbon dioxide gas into the gas buffer tank to make the pressure reach 1MPa, and preheats for 1 hour. After the preheating is over, open the valve between the absorber and the gas buffer tank and then close it quickly. After closing the valve, record the pressure drop change of the absorber continuously for 10 minutes, and record the final pressure after the pressure in the absorber is balanced.

[0023] b) The Henry coefficient of carbon dioxide gas in the absorbent is calculated according to the thermodynamic model, and the liquid-phase mass transfer coefficient of carbon dioxide gas in the absorbent is calculated a...

Embodiment 3

[0027] a) At a temperature of 40°C and a rotational speed of 200rpm, add 20g of 75wt% [bmim][BF 4 ] of the absorbent, and measure the gas selectivity of the absorbent to separate methane and carbon dioxide under the proportioning.

[0028] b) Adding 20 g of polyethylene glycol dimethyl ether into the absorption tank respectively as a blank experiment to measure the gas selectivity of the polyethylene glycol dimethyl ether for separating methane and carbon dioxide. The comparative test results are shown in the following table (Table 3):

[0029] Table 3 The comparison of compound solvent and polyethylene glycol dimethyl ether gas selectivity

[0030]

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Abstract

The invention belongs to the technical field of gas separation and purification, and relates to a high-selectivity decarbonization absorbent adopting a physical method. According to the absorbent, an ionic liquid and a polyethylene glycol dimethyl ether compound solvent are taken as absorbents, wherein the ionic liquid not only has higher carbon dioxide absorbing capacity, but also can remarkably improve the selectivity for separating methane and carbon dioxide, and polyethylene glycol dimethyl ether can further improve the carbon dioxide absorbing capacity and simultaneously increases the carbon dioxide mass transfer rate; the compound solvent is contacted with treated gas, and the purpose of gas purification is achieved; and the concentration of the ionic liquid in the compound absorbent is 10%-90% at the weight percent. According to the technical scheme, the absorbent has high selectivity in separation of methane and carbon dioxide, and the mass transfer rate and the absorbing capacity are high; and the absorbent can be widely used for separating and purifying carbon dioxide in process gases such as natural gas, shale gas, coal bed gas, biogas and the like.

Description

technical field [0001] The invention belongs to the technical field of separation and purification of petroleum, coal combustion and chemical gas, and in particular relates to a novel absorption solvent for decarbonizing gas mixture. Background technique [0002] With the depletion of fossil energy and the increasing environmental pollution, methane gas has received more and more attention. The calorific value of methane combustion is high, and the carbon dioxide produced by combustion is significantly less than that of fossil fuels such as petroleum and coal, which is conducive to reducing the greenhouse effect and improving environmental quality. Methane exists in large quantities in natural gas, shale gas, coal bed methane, and biogas, but a certain amount of carbon dioxide gas is often associated with these process gases. Carbon dioxide gas will reduce the combustion calorific value and slow down the combustion speed. In addition, a large amount of useless carbon dioxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14C01B31/20C07C9/04C07C7/11C01B32/50
CPCY02C20/40Y02P20/151
Inventor 张香平张欣鲍迪黄莺董海峰曾少娟张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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