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Method for removing carbon dioxide from gas mixture through biphasic absorption

A gas mixture and carbon dioxide technology, applied in chemical instruments and methods, separation methods, chemical separation, etc., can solve the problems of small absorption capacity of diethanolamine, difficult separation of two phases, high desorption temperature of heavy phase, etc., to achieve industrial production, Effect of low regeneration temperature and improved absorption rate

Inactive Publication Date: 2014-03-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Diethanolamine organic solution is used as the absorption liquid in this document, but the heavy phase after absorption is an oily substance with high viscosity, the two phases are difficult to separate, and the absorption capacity of diethanolamine is small, and the desorption temperature of the heavy phase is still high (110°C ~125℃) Disadvantages

Method used

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  • Method for removing carbon dioxide from gas mixture through biphasic absorption
  • Method for removing carbon dioxide from gas mixture through biphasic absorption
  • Method for removing carbon dioxide from gas mixture through biphasic absorption

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Add 200ml of triethylenetetramine (TETA) ethanol solution with a concentration of 0.2M into a double stirred tank with a height of 15cm and an inner diameter of 8cm. For the mixed gas of carbon dioxide, the inlet flow rate is controlled by a mass flowmeter, and the outlet flow rate is measured by a soap film flowmeter, which is measured every five minutes. The instantaneous absorption rate is calculated by the flow difference between the inlet and outlet, and the absorption amount is obtained by integrating the absorption rate with time, see figure 1 Middle curve A, its maximum absorption capacity is 0.068mol CO 2 .

[0035] After the absorption is completed, separate the solid phase and the liquid phase through the suction filter funnel, transfer the solid phase and the liquid phase to the flask respectively, slowly drop in dilute sulfuric acid with a concentration of 0.5M, collect the released gas with a graduated cylinder and measure the volume, so as to separate Ca...

Embodiment 2

[0037] Add 200ml of triethylenetetramine / n-decyl alcohol solution with a concentration of 0.2M into a double stirred tank with a height of 15cm and an inner diameter of 8cm, adjust the stirring speed of the liquid phase to 150rpm, and keep the temperature at 20°C through the interlayer water bath, and then pass in a solution containing 34.5% For a mixture of carbon dioxide, the inlet flow is controlled by a mass flowmeter, and the outlet flow is measured by a soap film flowmeter, which is measured every five minutes. The instantaneous absorption rate is calculated by the flow difference between the inlet and outlet, and the absorption amount is obtained by integrating the absorption rate with time. The maximum The absorption capacity is 0.070mol CO 2 .

[0038] After the absorption is completed, separate the solid phase and the liquid phase through the suction filter funnel, transfer the solid phase and the liquid phase to the flask respectively, slowly drop in dilute sulfuric...

Embodiment 3

[0040] Add 200ml of triethylenetetramine / tetrahydrofuran solution with a concentration of 0.2M to a double stirred tank with a height of 15cm and an inner diameter of 8cm, adjust the stirring speed of the liquid phase to 150rpm, and keep the temperature at 20°C through an interlayer water bath. For mixed gas, the inlet flow is controlled by a mass flowmeter, and the outlet flow is measured by a soap film flowmeter, which is measured every five minutes. The instantaneous absorption rate is calculated by the flow difference between the inlet and outlet, and the absorption capacity is obtained by integrating the absorption rate with time. The maximum absorption capacity 0.069mol CO 2 .

[0041] After the absorption is completed, separate the solid phase and the liquid phase through the suction filter funnel, transfer the solid phase and the liquid phase to the flask respectively, slowly drop in dilute sulfuric acid with a concentration of 0.5M, collect the released gas with a gra...

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Abstract

The invention discloses a method for removing carbon dioxide from a gas mixture through biphasic absorption. In the method, an organic solution of enamine is used as an absorbent, wherein the enamine is one or more of diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine and hexvinylhepamino; an organic solvent is one or more of C1-C10 alcohols, tetrahydrofuran, DMF and DMAC; the absorbent has the characteristics of large absorption amount and high absorption speed. The carbon dioxide in the gas mixture is removed by generating precipitate after being contacted with the absorbent, the absorbent is regenerated for desorption after the precipitate is obtained through separation, and desorbed liquid is reused in an absorption process; the method has the advantages of low regeneration temperature, and significant decrease in regeneration energy consumption.

Description

technical field [0001] The invention relates to the technical field of gas separation, in particular to a method for two-phase absorption and removal of carbon dioxide from a gas mixture. Background technique [0002] The greenhouse effect caused by carbon dioxide emissions has seriously affected our planet. At present, most countries in the world, including my country, have signed the "Kyoto Protocol", indicating that controlling carbon dioxide emissions has become a matter of great concern to all countries in the world. . At the same time, as a valuable carbon resource, carbon dioxide can be widely used in various fields such as machinery, chemical industry, food, medicine, etc. If it can be effectively recycled, it can reduce air pollution and continuously provide us with carbon resources . [0003] The sources of carbon dioxide in my country are very rich, but due to poor measures to recover carbon dioxide, the amount of carbon dioxide recycled and reused every year is ...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/62
CPCY02C10/04Y02A50/20Y02C20/40
Inventor 施耀郑书东何奕
Owner ZHEJIANG UNIV
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