Anhydrous CO2 (carbon dioxide) phase change absorbent with low energy consumption and regeneration method and application thereof

An absorbent, low-energy-consumption technology, applied in the fields of recovery, carbon dioxide capture, and separation, can solve the problems of high cost of ionic liquids, complex regeneration process, and complex separation process, and is conducive to industrialization, reducing phase separation processes, and reducing The effect of energy consumption

Active Publication Date: 2018-11-23
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Anhydrous CO2 (carbon dioxide) phase change absorbent with low energy consumption and regeneration method and application thereof
  • Anhydrous CO2 (carbon dioxide) phase change absorbent with low energy consumption and regeneration method and application thereof
  • Anhydrous CO2 (carbon dioxide) phase change absorbent with low energy consumption and regeneration method and application thereof

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Embodiment 1

[0045] 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:

[0046] 1) Sealed sampling: take 2.80g absorbent to absorb CO 2 The final carbamate solid is sealed ...

Embodiment 2

[0054] 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:

[0055] 1) Sealed sampling: take 3.10g absorbent to absorb CO 2 The final carbamate solid is sealed in a 20ml...

Embodiment 3

[0063] 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:

[0064] 1) Sealed sampling: take 3.30g absorbent to absorb CO 2 The final carbamate solid ...

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Abstract

The invention discloses an anhydrous CO2 (carbon dioxide) phase change absorbent with low energy consumption and a regeneration method and application thereof. The anhydrous CO2 phase change absorbentadopts unique diamine with primary amine (NH2-) and tertiary amine (-N-), and is free from organic solvent, water and ionic liquid, and the nitrogen atom of the tertiary amine is linked with two alkyl branched chains to form certain hydrophobicity; after the diamine absorbs CO2, the liquid phase is changed into the solid phase, the liquid and solid phase change is generated, and a white carbamatecrystal is formed; because the anhydrous CO2 phase change absorbent is an anhydrous unique absorbent, the potential heat of a solvent in the regeneration process is effectively reduced, the CO2 enriching phase separating process is reduced, and the energy consumption is decreased; the heat decomposing temperature is low, and the anhydrous CO2 phase change absorbent can be regenerated by heating.The regeneration method specifically comprises the following steps of (1) sampling under the sealing environment; (2) phase-change regeneration; (3) regeneration calculation; (4) phase change absorption; (5) absorption calculation; (6) circulating implementing. The anhydrous CO2 phase change absorbent is used for recycling the CO2 in chemical engineering reaction tail gas and combustion flue gas,and removing the CO2 in urban coal gas and natural gas.

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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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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