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Efficient energy-saving non-aqueous absorbent used for capturing carbon dioxide and application

A carbon dioxide, high-efficiency and energy-saving technology, used in reagents, chemical industry, organic chemistry, etc., can solve the problems of high material cost, high viscosity in the absorption process, low capture capacity, etc., to improve mass transfer capacity and reduce energy consumption for desorption. , the effect of increasing the capture capacity

Inactive Publication Date: 2020-02-04
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a class of single-component, low viscosity, low energy consumption and high-capacity non-aqueous absorbents for capturing carbon dioxide, so as to solve the problems of high material cost, high viscosity and high absorption process in the existing non-aqueous absorption system. Problems such as low capture capacity, and can achieve high capture capacity under low pressure and high pressure conditions

Method used

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  • Efficient energy-saving non-aqueous absorbent used for capturing carbon dioxide and application
  • Efficient energy-saving non-aqueous absorbent used for capturing carbon dioxide and application
  • Efficient energy-saving non-aqueous absorbent used for capturing carbon dioxide and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 2mL of N-(2-methoxyethyl)-N,N'-dimethylethylenediamine into a 10mL glass container with an inner diameter of 1.5cm, and then slowly introduce carbon dioxide gas at a flow rate of 40mL / min. The absorption temperature is 0.1MPa, and the absorption temperature is controlled at 25°C. Weigh and record the absorption amount with an electronic balance every five minutes. Three consecutive readings are close to reach the absorption balance, and take samples to measure the absorption saturation viscosity with a viscometer. The absorption saturation viscosity of N-(2-methoxyethyl)-N,N'-dimethylethylenediamine is 124cP, and the carbon dioxide capture capacity is 0.72mol CO 2 / mol absorbent (22wt%), the absorption time is 25min.

Embodiment 2

[0028] Add 2mL of N-(2-methoxyethyl)-N,N'-dimethylethylenediamine into a 10mL glass container with an inner diameter of 1.5cm, and then slowly introduce carbon dioxide gas at a flow rate of 40mL / min. The absorption temperature is 0.1MPa, the absorption temperature is controlled at 40°C, the absorption is recorded by weighing with an electronic balance every five minutes, and the absorption balance is reached when the readings are similar for three consecutive times, and the absorption saturation viscosity is measured with a viscometer. The absorption saturation viscosity of N-(2-methoxyethyl)-N,N'-dimethylethylenediamine is 41cP, and the carbon dioxide capture capacity is 0.70mol CO 2 / mol absorbent (21wt%), the absorption time is 20min.

Embodiment 3

[0030] Similar to Example 1 and Example 2, control the carbon dioxide absorption pressure to 0.1MPa, the absorption temperature to 25°C or 40°C, change the type of alkoxy-functionalized fatty diamine, and obtain the absorption at 25°C or 40°C Saturation viscosity and collection capacity are shown in the following table (Table 1).

[0031] Table 1 Effect of structures of different alkoxy functionalized aliphatic diamines on carbon dioxide capture

[0032]

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Abstract

The invention discloses an efficient energy-saving non-aqueous absorbent used for capturing carbon dioxide and application, and belongs to the technical fields of capture of carbon dioxide and reduction of carbon emission. According to the method, by introducing a flexible alkoxy functional group to increase the molecular volume of the absorbent, improvement of the viscosity in an absorption reaction process is reduced; and meanwhile, an amino group in a molecular structure of the absorbent is subjected to alkylation treatment, and intermolecular hydrogen-bond interaction of the absorbent is reduced, so that similarly, an effect of controlling the viscosity is achieved. According to the efficient energy-saving non-aqueous absorbent used for capturing the carbon dioxide and application, through low-viscosity functionalization treatment on a molecular design level, the flowing capability and the mass transfer capability of an aliphatic diamine non-aqueous absorption system are improved,so that low-energy-consumption high-capability capture of the carbon dioxide is achieved.

Description

technical field [0001] The invention belongs to the technical field of gas separation, and relates to a high-efficiency and energy-saving non-aqueous absorbent for capturing carbon dioxide and its application. Background technique [0002] Human beings use fossil fuels as the main energy source for industrial production to emit a large amount of flue gas rich in carbon dioxide every year, and carbon dioxide is the main greenhouse gas that causes global climate change. common problem. The mainstream countries in the world are all taking the promotion of their respective carbon emission reductions in the "Paris Agreement" as the first task, and are trying their best to avoid the environmental problems caused by excessive carbon dioxide emissions. At the same time, carbon dioxide is a cheap, easy-to-obtain, non-flammable, non-toxic, harmless and renewable carbon resource, which can be catalytically converted into carboxylic acid, urea, etc. Chemical raw materials and fine che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14C07C217/08
CPCB01D53/1475B01D2252/2041C07C217/08Y02P20/151Y02P20/50Y02C20/40
Inventor 刘安华吕小兵李杰杰
Owner DALIAN UNIV OF TECH
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