CN109200760B

CN109200760B - Low-energy-consumption regenerated eutectic solvent for removing carbon dioxide stably

Info

Publication number: CN109200760B
Application number: CN201811383768.6A
Authority: CN
Inventors: 徐霞; 胡正天; 毕莹莹; 徐建
Original assignee: Anhui University of Technology AHUT
Current assignee: Anhui University of Technology AHUT
Priority date: 2018-11-20
Filing date: 2018-11-20
Publication date: 2021-06-04
Anticipated expiration: 2038-11-20
Also published as: CN109200760A

Abstract

The invention relates to CO₂The adsorption capture field, in particular to a stable low-energy-consumption regenerated eutectic solvent for removing carbon dioxide, which consists of a hydrogen bond donor and a hydrogen bond acceptor, wherein the hydrogen bond donor and the hydrogen bond acceptor are associated through hydrogen bonds to form a ternary eutectic mixture, the hydrogen bond acceptor is ammonium chloride or hydrochloric acid-ammonium chloride, and the hydrogen bond donor consists of organic amine and polyhydric alcohol, so that the reaction speed with the carbon dioxide can be effectively improved, and the adsorption quantity is increased; the low cosolvent prepared by the invention can effectively improve the adsorption capture efficiency of carbon dioxide and reduce the regeneration energy consumption.

Description

Low-energy-consumption regenerated eutectic solvent for removing carbon dioxide stably

Technical Field

The invention relates to CO₂The field of adsorption and capture, in particular to a stable low-energy-consumption regenerated eutectic solvent for removing carbon dioxide.

Background

Carbon dioxide is a major greenhouse gas, and its emission causes global temperature rise, so that the environmental problems associated with human survival and development are one of the most serious challenges facing human society. Research shows that CO is generated at the end of 21 st century₂The emission will raise the global air temperature by 6 ℃, greatly exceed the safety line of 2 ℃, and bring disastrous results if no measures are taken. Combustion of fossil fuels leads to a large emission of CO₂Causing recent global accelerated warming. However, the low price of coal and the mature development of combustion technology cause the dependence of human beings on fossil fuels, and the coal is still a main energy source in a short time. The capture of greenhouse gases is therefore currently reducing atmospheric CO₂One of the methods with effective content is the research focus in recent years.

The chemical absorption method has large absorption capacity and good absorption effect, the absorbent is recycled, and high-purity CO can be obtained₂Using weakly basic absorbents with CO₂The unstable salt generated by the reaction is reversely decomposed under certain conditions (such as heating) to release CO₂. The liquid absorption method in the chemical absorbent includes a hot potash method, an organic amine absorption method and an ammonia water method. The hot potash process has the advantages of strong absorption capacity, low price, high purity of the regenerated gas, slow reaction speed, easy foaming, large regeneration energy consumption and severe corrosion to equipment. Ammonia water absorption of CO₂High efficiency, low cost, low energy consumption and little corrosion to equipment. However, ammonia is unstable and CO is released during regeneration₂Entraining a certain amount of ammonia gas.

Organic amine absorption is currently the most widespread CO₂Chemical absorption of organic amines with CO₂After chemical reaction, a stable intermediate complex is formed, and then the solvent and CO are separated by a regenerating device₂. The amine absorbent has high absorption speed, strong absorption capacity and low cost, but the organic amine absorbent is easily polluted by organic matters, inorganic matters, solid particles and other impurities to degrade, so that the solvent loss is caused. In addition, the method consumes a large amount of energy in the recycling process of the amine solution, and the corrosion to equipment is serious. The ionic liquid has the prospect of material number as a substitute organic amine solution, but the mass transfer speed is slow due to high viscosity of the ionic liquid, and CO is₂The adsorption speed is low, and the adsorption quantity is far lower than that of the organic amine solution calculated by per gram of the adsorbent, so that the use requirement cannot be met.

Disclosure of Invention

Technical problem to be solved

Aiming at the problems, the invention provides a stable low-energy-consumption regenerated eutectic solvent for removing carbon dioxide, which can effectively improve the adsorption capture efficiency of carbon dioxide.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme:

the low-energy-consumption regenerated stable eutectic solvent for removing the carbon dioxide is characterized in that the eutectic solvent consists of a hydrogen bond donor and a hydrogen bond acceptor, and is a ternary eutectic solvent formed by the association of the hydrogen bond donor and the hydrogen bond acceptor through hydrogen bonds;

the hydrogen bond acceptor is any one of ammonium chloride and hydrochloric acid-ammonium chloride, and the hydrogen bond donor is composed of organic amine and polyhydric alcohol.

Preferably, the organic amine is any one of ethanolamine, diethanolamine, triethanolamine, diethylenetriamine and N, N-dimethylethylenediamine.

Preferably, the polyhydric alcohol is any one of pentaerythritol, ethylene glycol, propylene glycol and butylene glycol.

Preferably, the molar ratio of the hydrogen bond donor to the organic amine to the polyhydric alcohol in the ternary eutectic solvent is 1 (4-10) to 0.01-1.

Preferably, the molar ratio of the hydrogen bond donor to the organic amine to the polyhydric alcohol in the ternary eutectic solvent is 1 (4-8) to 0.1-0.8.

Preferably, the eutectic solvent is applied to CO₂And (4) adsorbing and capturing the gas.

(III) advantageous effects

The eutectic solvent is composed of a hydrogen bond donor and a hydrogen bond acceptor, wherein the hydrogen bond donor and the hydrogen bond acceptor are associated through a hydrogen bond to form a ternary eutectic mixture, the hydrogen bond acceptor is ammonium chloride or hydrochloric acid-ammonium chloride, and the hydrogen bond donor is composed of organic amine and polyhydric alcohol, so that the reaction speed with carbon dioxide can be effectively improved, and the adsorption capacity is increased; the low cosolvent prepared by the invention can effectively improve the adsorption capture efficiency of carbon dioxide and reduce the regeneration energy consumption.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The eutectic solvent for removing carbon dioxide, which is stable and regenerated with low energy consumption, comprises the following components: ammonium chloride, ethanolamine and ethylene glycol in a molar ratio of 1: 4: 0.01, mixing the three, stirring and mixing for 2 hours to obtain a clear solution, namely the eutectic solvent.

Example 2

The low-energy-consumption regenerated eutectic solvent for removing carbon dioxide consists of three components of hydrochloric acid-amine chloride, ethanolamine and glycerol in a molar ratio of 1: 6: 0.5, prepared as in example 1.

Reacting CO at room temperature₂Introducing 5ml of the above solvent into the gas at a flow rate of 10ml/min, adsorbing for 1 hr, and detecting by weight to obtain CO₂The adsorption value of (A) was 0.24 g/g.

Example 3

The eutectic solvent for removing carbon dioxide, which is stable, low in energy consumption and regenerative, consists of three components, namely amine chloride, ethanolamine and ethylene glycol, and the molar ratio of the eutectic solvent to the ethylene glycol is 1: 8: 0.8, prepared as in example 1.

Reacting CO at room temperature₂Introducing 5ml of the above solvent into the gas at a flow rate of 10ml/min, adsorbing for 1 hr, and detecting by weight to obtain CO₂The adsorption value of (A) was 0.256 g/g.

Example 4

The eutectic solvent for removing carbon dioxide, which is stable, low in energy consumption and renewable, consists of three components, namely amine chloride, diethanol amine and glycerol, and the molar ratio of the three components is 1: 7: 0.08, prepared as in example 1.

Reacting CO at room temperature₂Introducing 5ml of the above solvent into the gas at a flow rate of 20ml/min, adsorbing for 3 hours, and detecting by weight to obtain CO₂The adsorption value of (A) was 0.26 g/g.

Example 5

The low-energy-consumption regenerated eutectic solvent for removing carbon dioxide consists of three components of amine chloride, triethanolamine and glycol in a molar ratio of 1: 4: 0.1, preparation method is as follows

Example 1.

CO is introduced at 40 DEG C₂Introducing gas into 5ml of the above solvent at a flow rate of 30ml/min, adsorbing for 1 hr, and detecting by weight to obtain CO₂The adsorption value of (A) was 0.18 g/g.

Example 6

The low-energy-consumption regenerated eutectic solvent for removing carbon dioxide consists of three components of ammonium chloride, diethylenetriamine and glycerol, and the molar ratio of the low-energy-consumption regenerated eutectic solvent to the carbon dioxide is 1: 6: 0.3, prepared as in example 1.

Reacting CO at room temperature₂Introducing 5ml of the above solvent into the gas at a flow rate of 10ml/min, adsorbing for 1 hr, and detecting by weight to obtain CO₂The adsorption value of (A) was 0.21 g/g. Then, the mixture was heated to a temperature of 100 ℃ for two hours, and then cooled to room temperature, whereby 0.18g of the weight of the system was reduced. CO is discharged again₂Introducing gas into the eutectic solvent after heating and cooling at flow rate of 10ml/min, adsorbing for 1 hr, and detecting by weight to obtain CO₂The adsorption value of (A) was 0.17 g/g.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The low-energy-consumption regenerated stable eutectic solvent for removing the carbon dioxide is characterized in that the eutectic solvent consists of a hydrogen bond donor and a hydrogen bond acceptor, and is a ternary eutectic solvent formed by the association of the hydrogen bond donor and the hydrogen bond acceptor through hydrogen bonds;

the hydrogen bond acceptor is ammonium chloride or hydrochloric acid-ammonium chloride, and the hydrogen bond donor is composed of organic amine and polyhydric alcohol;

the organic amine is triethanolamine and the polyhydric alcohol is pentaerythritol.

2. The stable low-energy-consumption regenerated eutectic solvent for removing carbon dioxide as claimed in claim 1, wherein the molar ratio of the hydrogen bond acceptor, the organic amine and the polyhydric alcohol in the ternary eutectic solvent is 1 (4-10) to (0.01-1).

3. The stable low-energy-consumption regenerated eutectic solvent for removing carbon dioxide as claimed in claim 2, wherein the molar ratio of the hydrogen bond acceptor, the organic amine and the polyhydric alcohol in the ternary eutectic solvent is 1 (4-8) to (0.1-0.8).

4. The stable low-energy-consumption regenerated eutectic solvent for removing carbon dioxide as claimed in claim 1, wherein said eutectic solvent is applied to CO₂And (4) adsorbing and capturing the gas.