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A kind of aminoethylated piperazine and its preparation method, carbon dioxide absorbent and its application

A technology of amine ethyl and piperazine, which is applied in the field of carbon dioxide capture, can solve the problems of poor thermal stability, unsatisfactory recycling performance, degradation and inactivation of alcohol amine absorbents, and achieve improved recycling rate and enhanced stability High performance, low energy consumption for desorption

Active Publication Date: 2022-05-24
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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  • A kind of aminoethylated piperazine and its preparation method, carbon dioxide absorbent and its application
  • A kind of aminoethylated piperazine and its preparation method, carbon dioxide absorbent and its application
  • A kind of aminoethylated piperazine and its preparation method, carbon dioxide absorbent and its application

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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 comprises the following steps:

[0046] Compound 1, compound 2 and water are mixed to carry out substitution reaction to obtain amine ethylated piperazine;

[0047] where R 1 is C1-C4 alkyl;

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

[0049] Compound 3, compound 4 and water are mixed to carry out substitution reaction to obtain amine ethylated piperazine;

[0050] where R 1 , R 3 and R 4 independently C1-C4 alkyl.

[0051] In the present invention, unless otherwise specified, all raw material components are commercially available commodities 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-neck flask, dissolve 240mmol of triethanolamine in 350mL of dichloromethane, and stir for 10min at room temperature and 600r / min. Under ice-water bath cooling, 1200 mmol thionyl chloride was added dropwise to the solution at a constant speed with a constant pressure dropping funnel, and the dropwise addition was completed within 30 min. Immediately, the single-necked bottle was transferred to a 40° C. oil bath, and the reaction was refluxed for 12 h. Then the solvent dichloromethane and excess thionyl chloride were removed with 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 into a 500 mL autoclave, add 260 mL of methylamine aqueous solution with a concentration of 40 wt %, seal it in an oil bath at 60 ° C, 800 r / The reaction was carrie...

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Abstract

The invention provides an amine ethylated piperazine, a preparation method thereof, a carbon dioxide absorbent and an application thereof, and relates to the technical field of carbon dioxide capture. The aminoethylated piperazine with the structure shown in formula I provided by the present invention introduces piperazine as a skeleton, and utilizes the structural toughness of the piperazine ring to enhance the stability of the aminoethylated piperazine molecule, thereby inhibiting the aminoethylated piperazine Thermal degradation during the heating desorption process; the nitrogen atom of the piperazine skeleton is bonded to the amine ethyl side chain to increase the polar nucleophilic reaction site, while improving the carbon dioxide capture capacity of the absorbent, it also enhances its fluidity and Water solubility; by linking the alkyl group at the side chain nitrogen atom to convert it into a tertiary amine, controlling the number of N‑H bonds in the amine ethylated piperazine structure to reduce the heat of reaction in the carbon dioxide absorption process, thereby improving the reaction The desorption efficiency of carbon dioxide and the reduction of desorption energy consumption are excellent for the recycling performance of carbon dioxide capture.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide capture, in particular to an amine ethylated piperazine and a preparation method thereof, a carbon dioxide absorbent and applications thereof. Background technique [0002] Industrial production using fossil fuels as the main energy source emits a large amount of carbon dioxide-rich flue gas every year, and carbon dioxide is the main greenhouse gas that causes global warming. Therefore, how to reduce carbon dioxide emissions to reduce its atmospheric concentration has become the face of today's human society. common problem. At the same time, carbon dioxide is a cheap, easily available, non-flammable, non-toxic, harmless and renewable carbon resource. By building C-C, C-N, C-O and other chemical bonds and hydrogenation reduction methods, it can be catalyzed and converted into carboxylic acids, urea, Chemical raw materials and fine chemicals including carbonate / polycarbonate, carbamate, oxa...

Claims

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Application Information

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Patent Type & Authority Patents(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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