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Aminoethylated piperazine and preparation method thereof, carbon dioxide absorbent and application of carbon dioxide absorbent

A technology of carbon dioxide and amine ethyl, which is applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of poor thermal stability, unsatisfactory recycling performance, degradation and inactivation of alcohol amine absorbents, and achieve improved Recycling efficiency, enhanced stability, and low energy consumption for desorption

Active Publication Date: 2021-10-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned alcohol amine absorbents have poor thermal stability and are easily degraded and deactivated during the heating desorption process, resulting in unsatisfactory recycling performance.

Method used

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  • Aminoethylated piperazine and preparation method thereof, carbon dioxide absorbent and application of carbon dioxide absorbent
  • Aminoethylated piperazine and preparation method thereof, carbon dioxide absorbent and application of carbon dioxide absorbent
  • Aminoethylated piperazine and preparation method thereof, carbon dioxide absorbent and application of carbon dioxide absorbent

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preparation example Construction

[0045] The present invention provides the preparation method of the amine ethylated piperazine described in the above technical scheme, (i) when the R 2 When it is a C1-C4 alkyl group, the preparation method includes the following steps:

[0046] Mixing compound 1, compound 2 and water for substitution reaction to obtain aminoethylated piperazine;

[0047] Among them, R 1 It is C1~C4 alkyl;

[0048] (ii) when the R 2 for When, the preparation method comprises the following steps:

[0049] Mixing compound 3, compound 4 and water for substitution reaction to obtain aminoethylated piperazine;

[0050] Among them, R 1 , R 3 and R 4 are independently C1-C4 alkyl groups.

[0051] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0052] When the R 2 When it is a C1-C4 alkyl group, the preparation method includes the following steps: mixing compound 1, compound...

Embodiment 1

[0088] Synthesis of N-(2-methylaminoethyl)-N'-methyl-piperazine

[0089]

[0090] Step 1: In a 500mL single-necked bottle, dissolve 240mmol of triethanolamine in 350mL of dichloromethane, and stir at room temperature and 600r / min for 10min. Under cooling in an ice-water bath, 1200 mmol thionyl chloride was added dropwise to the solution at a constant speed using a constant-pressure dropping funnel, and the dropwise addition was completed within 30 minutes. Immediately, the one-necked bottle was transferred to an oil bath at 40° C., and refluxed for 12 hours. Then the solvent dichloromethane and excess thionyl chloride were removed by a rotary evaporator to obtain the intermediate tris(2-chloroethyl)amine hydrochloride.

[0091] Step 2: Transfer all the tris(2-chloroethyl)amine hydrochloride obtained in step 1 to a 500mL autoclave, add 260mL of a 40wt% methylamine aqueous solution, seal it and place it in a 60°C oil bath, 800r / h React for 12 hours under the condition of st...

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Abstract

The invention provides aminoethylated piperazine and a preparation method thereof, a carbon dioxide absorbent and application of the carbon dioxide absorbent, belonging to the technical field of carbon dioxide trapping. According to the aminoethylated piperazine with a structure as shown in a formula I, piperazine is introduced to serve as a framework, the stability of aminoethylated piperazine molecules is enhanced through the structural toughness of a piperazine ring, and then, thermal degradation of aminoethylated piperazine in a heating desorption process is inhibited; an aminoethyl side chain is bonded on a nitrogen atom of the piperazine framework, so polar nucleophilic reaction sites are increased, and the mobility and the water solubility of the absorbent are enhanced while the carbon dioxide capture capacity of the absorbent is improved; and the side chain nitrogen atom is bonded with an alkyl group so as to convert the side chain nitrogen atom into tertiary amine, and the number of N-H bonds in an aminoethylated piperazine structure is controlled so as to reduce reaction heat during carbon dioxide absorption, so carbon dioxide desorption efficiency is improved, the energy consumption of desorption is reduced, and the recycling performance of the captured carbon dioxide is excellent.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide capture, in particular to an aminoethylated piperazine, a preparation method thereof, a carbon dioxide absorbent and an application thereof. Background technique [0002] Industrial production using fossil fuels as the main energy source emits a large amount of flue gas rich in carbon dioxide every year, and carbon dioxide is the main greenhouse gas that causes global warming. common problem. At the same time, carbon dioxide is a cheap, easy-to-obtain, non-flammable, non-toxic, harmless and renewable carbon resource. By constructing chemical bonds such as C-C, C-N, C-O and hydrogenation reduction, it can be catalytically converted into Chemical raw materials and fine chemicals including carbonate / polycarbonate, carbamate, oxazolone, quinazolinedione, methanol, formic acid and formamide. Therefore, no matter from the perspective of environmental protection or resource utilization, capturin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/62B01D53/78
CPCB01D53/78B01D53/62B01D2257/504Y02A50/20Y02C20/40
Inventor 刘安华陈绍云吕小兵张永春刘家旭
Owner DALIAN UNIV OF TECH
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