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Alcohol amine and ionic liquid composite CO2 absorbent as well as preparation method and application thereof

An ionic liquid, CO2 technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of easy escape of organic amines, pollution, low absorption rate, etc., achieve high CO2 absorption rate and solubility, and reduce use costs , the effect of avoiding environmental pollution

Pending Publication Date: 2021-12-28
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among the existing carbon capture technologies, the organic amine absorption method is the most common. However, this method has defects such as severe equipment corrosion, high toxicity, easy escape of organic amines, and high regeneration energy consumption. Therefore, it is urgent to improve the existing absorption liquid, and develop more efficient, Environmentally friendly and energy-saving carbon dioxide absorbent
Industrial treatment of CO 2 , usually a single ethanolamine is used to absorb CO 2 , easily lead to a large area of ​​volatile waste and pollution; a single use of ionic liquid aqueous solution as CO 2 As a trapping agent, there are disadvantages such as low absorption rate and high cost, which limit the ability of ionic liquid aqueous solution to capture CO 2 practical industrial applications in

Method used

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  • Alcohol amine and ionic liquid composite CO2 absorbent as well as preparation method and application thereof
  • Alcohol amine and ionic liquid composite CO2 absorbent as well as preparation method and application thereof
  • Alcohol amine and ionic liquid composite CO2 absorbent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 7.410g [C 2 Add mim][Gly] and 5.665g MEA into a 100mL beaker, dilute with water, transfer to a 100mL volumetric flask to constant volume, and shake well to obtain an absorbent product.

[0024] use as figure 1 The shown device performed a CO 2 In the adsorption experiment, the temperature of the water bath was stabilized at 30 °C, and the flow rate of 100 mL / min of N 2 and 25mL / min of CO 2 . CO in the portable infrared gas analyzer 2 After the content is stable, take 40mL of the prepared absorbent and inject it into the double kettle stirrer for adsorption through a syringe, and calculate the CO by referring to formula (1). 2 Absorption rate:

[0025]

[0026] In the above formula, A-gas-liquid interface contact area, the value here is 0.00136m 2 ;G 1 - intake air flow, mol / s; G 2 -Outflow flow rate, mol / s; Y 1 - CO in the intake air 2 Molar content; Y 2 - Outgassing CO 2 Molar content.

[0027] In order to reduce the CO 2 Absorb the error caused by th...

Embodiment 2

[0033] 9.384g [C 4 Add mim][Gly] and 10.750g MEA into a 100mL beaker, dilute with water, transfer to a 100mL volumetric flask to constant volume, and shake well to obtain an absorbent product.

[0034] use as figure 1 The shown device performed a CO 2 In the adsorption experiment, the temperature of the water bath was stabilized at 30 °C, and the flow rate of 100 mL / min of N 2 and 25mL / min of CO 2 . CO in the portable infrared gas analyzer 2 After the content is stable, take 40mL of the prepared absorbent and inject it into the double tank stirrer for adsorption through a syringe, and the calculated absorption rate is 5.2mmol / s m 2 .

[0035]Nitrogen is used for purging under normal pressure, and the absorbed rich liquid is used figure 2 The desorption unit shown was regenerated at 90°C for 30 minutes, and the calculated desorption rate was 97%.

[0036] In short, the ionic liquid selected by the adsorbent of this application is different from the existing literature ...

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Abstract

The invention relates to an alcohol amine and ionic liquid composite CO2 absorbent as well as a preparation method and application thereof. The adsorbent is formed by mixing ionic liquid, ethanolamine and water, the total concentration of the ionic liquid and the ethanolamine is 0.2-2.5 mol / L, and the molar ratio of the ionic liquid to the ethanolamine is (1: 9)-(9: 1). The ionic liquid is selected from any one of [C2mim] [Gly], [C4mim] [Gly] and [Aemim] [Br], and the ethanolamine is selected from any one of monoethanolamine, diethanolamine and N-methyldiethanolamine. During adsorption, the absorbent is directly contacted with CO2-containing gas at the temperature of 10-60 DEG C and under the pressure of 1-2 bar, and rich liquor obtained by adsorption is heated, decompressed, flashed or stripped at the temperature of 70-130 DEG C and under the pressure of 0.8-1 bar, so that the absorbent can be regenerated and reused. According to the absorbent provided by the invention, the capture rate of CO2 can be remarkably improved, CO2 in mixed gas can be rapidly and efficiently captured under the condition of low energy consumption, the preparation, use and regeneration processes of the absorbent are simple, the operation conditions are easy to control, and relatively high CO2 absorption rate and solubility are still maintained even after CO2 is circularly absorbed and desorbed for multiple times.

Description

technical field [0001] The invention relates to the technical field of exhaust gas treatment, in particular to an alcohol amine and ionic liquid composite CO 2 Absorbent and its preparation method and application. Background technique [0002] The problem of global warming caused by the greenhouse effect is becoming more and more serious, which has attracted the attention of the whole world. The reduction of carbon dioxide emissions is urgent. Carbon neutrality has become the theme of economic and social development at home and abroad. CO in industrial waste gas 2 Capturing and converting to reduce CO 2 The development of green economy has become the main direction of industrial development in the future. [0003] Among the existing carbon capture technologies, the organic amine absorption method is the most common. However, this method has defects such as severe equipment corrosion, high toxicity, easy escape of organic amines, and high regeneration energy consumption. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCB01D53/1493B01D53/1475B01D53/1425B01D2258/0283B01D2258/01B01D2258/02B01D2257/504B01D2252/20484B01D2252/20489B01D2252/30B01D2252/504Y02A50/20Y02C20/40
Inventor 吴再坤穆新伟汪铁林孔剑王存文覃远航杨犁马家玉吕仁亮王为国
Owner WUHAN INSTITUTE OF TECHNOLOGY