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A low energy consumption anhydrous CO 2 Phase change absorbent and regeneration method and application

An absorbent and CO2 technology, applied in the field of low-energy anhydrous CO2 phase-change absorbents, can solve problems such as complex regeneration process, high viscosity, and complicated separation process, and achieve the goal of reducing energy consumption, latent heat, and phase separation process Effect

Active Publication Date: 2022-03-15
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These absorbents have been greatly improved compared with the previous single-component absorbents, but there are still many problems in terms of absorption capacity, absorption rate and energy consumption, such as: complicated separation process, high cost of ionic liquid, high viscosity, regeneration process, etc. Complex, high energy consumption, high toxicity, difficult to be widely used in industrial processes, etc.

Method used

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  • A low energy consumption anhydrous CO <sub>2</sub> Phase change absorbent and regeneration method and application
  • A low energy consumption anhydrous CO <sub>2</sub> Phase change absorbent and regeneration method and application
  • A low energy consumption anhydrous CO <sub>2</sub> Phase change absorbent and regeneration method and application

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Embodiment 1

[0040] Absorbent of the present invention adopts primary amine (NH 2 -) and tertiary amine (-N-) a single diamine compound N, N'-dimethylethylenediamine, the concentration is 100%, does not contain any other organic solvents, water and ionic liquid, wherein the tertiary amine nitrogen There are two alkyl branch chains linked on the atom, which constitute a certain degree of hydrophobicity. Its molecular structure formula is Absorbent N of the present invention, N'-dimethylethylenediamine absorbs CO 2 when CO 2 The flow rate is 25ml / min, and the absorption saturation is reached in 10min, and the CO of the absorbent 2 Loading capacity is 0.465mol CO 2 / mol amine, the mechanism of the phase change reaction of the absorbent is: A low energy consumption anhydrous CO of the present invention 2 The regeneration method of phase-change absorbent, comprises the following steps:

[0041] 1) Sealed sampling: take 2.80g absorbent to absorb CO 2 The final carbamate solid is sealed ...

Embodiment 2

[0049] Absorbent of the present invention adopts primary amine (NH 2 -) and tertiary amine (-N-) a single diamine compound N, N'-diethylethylenediamine, the concentration is 100%, does not contain any other organic solvents, water and ionic liquid, wherein the tertiary amine nitrogen There are two alkyl branch chains linked on the atom, which constitute a certain degree of hydrophobicity. Its molecular structure formula is Absorbent N of the present invention, N'-diethylethylenediamine absorbs CO 2 when CO 2 The flow rate is 30ml / min, and the absorption saturation is reached in 12min, and the CO of the absorbent 2 Loading capacity is 0.464mol CO 2 / mol amine, the phase change reaction mechanism of the adsorbent is: A low energy consumption anhydrous CO of the present invention 2 The regeneration method of phase-change absorbent, comprises the following steps:

[0050] 1) Sealed sampling: take 3.10g absorbent to absorb CO 2 The final carbamate solid is sealed in a 20ml...

Embodiment 3

[0058] Absorbent of the present invention adopts primary amine (NH 2 -) and tertiary amine (-N-), the single diamine compound N, N'-diisopropylethylenediamine, the concentration is 100%, does not contain any other organic solvents, water and ionic liquid, wherein the tertiary amine There are two alkyl branch chains linked to the nitrogen atom, which constitute a certain degree of hydrophobicity. Its molecular structure formula Absorbent N of the present invention, N'-diisopropylethylenediamine absorbs CO 2 when CO 2 The flow rate is 35ml / min, the absorption saturation is reached in 9min, and the CO of the absorbent 2 The loading capacity is 0.413mol CO2 / mol amine, and the phase change reaction mechanism of the adsorbent is as follows: A low energy consumption anhydrous CO of the present invention 2 The regeneration method of phase-change absorbent, comprises the following steps:

[0059] 1) Sealed sampling: take 3.30g absorbent to absorb CO 2 The final carbamate solid ...

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Abstract

The invention discloses a low energy consumption anhydrous CO 2 Phase change absorbent and regeneration method and application, the absorbent adopts primary amine (NH 2 ‑) and tertiary amine (‑N‑) single diamine, free of any other organic solvents, water and ionic liquids, two alkyl branched chains are linked to the nitrogen atom of the tertiary amine, forming a certain degree of hydrophobicity, the Diamine absorbs CO 2 After that, it changes from liquid phase to solid phase, and a liquid-solid phase transition occurs to form white carbamate crystals. Since it is an anhydrous single absorbent, it can effectively reduce the latent heat of the solvent in the regeneration process and reduce CO 2 Enrichment phase separation process reduces energy consumption. The absorbent has a low thermal decomposition temperature and can be regenerated by heating. The specific steps are: 1) sealed sampling, 2) phase change regeneration, 3) regeneration calculation, 4) phase change absorption, 5) absorption calculation, 6) cycle implementation, application Used to recover CO from chemical reaction tail gas and combustion flue gas 2 , and removal of CO from city gas and natural gas 2 .

Description

technical field [0001] The invention relates to the technical field of carbon dioxide capture, separation and recovery, in particular to a low-energy anhydrous CO 2 Phase change absorbent and its regeneration method and application. Background technique [0002] Carbon dioxide (CO2) from coal-fired power plants and other industrial 2 ) emissions as the most important man-made greenhouse gas (Greenhouse Gas, GHG) has attracted worldwide attention. Atmospheric CO 2 One of the environmental impacts of accumulation is global warming, leading to climate issues such as melting polar regions, rising sea levels and more severe weather patterns. It is generally accepted that there is an immediate need to reduce CO2 from coal combustion before more efficient technologies or other renewable energy sources can replace fossil fuels. 2 emission. At the 2009 Copenhagen World Climate Conference, the Chinese government promised that by 2020, the CO emitted per unit of gross domestic pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14
CPCB01D53/14B01D53/1475Y02C20/40B01D53/1425B01D53/1493B01D2252/2041B01D2252/20421B01D2252/20431B01D2252/40B01D2258/018C10L3/104C10L2290/541C07C269/04
Inventor 张青松李晓朋李云飞张娟蔡依蓉李安安金学东刘鹏飞陈莉
Owner TIANJIN POLYTECHNIC UNIV
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