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Absorbent for capturing or separating carbon dioxide and its application

A carbon dioxide and absorbent technology, applied in the direction of absorption, separation method, dispersed particle separation, etc., can solve the problems of restricting the effective absorbent concentration, increasing the volatility of liquid ammonia, and increasing the corrosiveness, achieving high economy, reducing Viscosity, low corrosive effect

Active Publication Date: 2015-11-18
GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosiveness and viscosity of organic amine solutions increase with the increase of amine concentration, and the volatility of liquid ammonia increases sharply with the increase of ammonia concentration, which restricts the further increase of effective absorbent concentration in mainstream absorbents.

Method used

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  • Absorbent for capturing or separating carbon dioxide and its application
  • Absorbent for capturing or separating carbon dioxide and its application
  • Absorbent for capturing or separating carbon dioxide and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Mix 50g N-methylcyclohexylamine MCA (mass fraction 10%) with 50g deionized water (mass fraction 10%), add to 400g [Bmim][OAc] ionic liquid preset in a beaker, stir evenly, and obtain absorbent. Measure 50g of the absorbent and put it in an absorption bottle. After the absorption bottle is placed in a constant temperature water bath at 40°C for 10 minutes, the pressure is set to normal pressure, and the CO2 of 16.35mL / min is used. 2 and 120mL / min of N 2 The composition simulated coal-fired flue gas is introduced into the absorption bottle, and the weight of the absorption bottle is weighed at regular intervals. If the weight of the absorption bottle does not change, it can be considered that the absorption has reached equilibrium. The final CO absorbed 2 is 1.84g. The absorbed system was regenerated at 101 °C for 20 min, and the regeneration rate was 38.26%.

[0036] Control the absorption temperature, absorption pressure, stirring rate, absorbent quality, amine acti...

Embodiment 2

[0038] Mix 50 g of piperazine PZ (10% by mass) with 50 g of deionized water (10% by mass), add it to 400 g of [Bmim][OAc] ionic liquid preset in a beaker, and stir evenly to obtain an absorbent. Measure 50g of the absorbent and put it in an absorption bottle. After the absorption bottle is placed in a constant temperature water bath at 40°C for 10 minutes, the pressure is set to normal pressure, and the CO2 of 16.35mL / min is used. 2 and 120mL / min of N 2 The composition simulated coal-fired flue gas is introduced into the absorption bottle, and the weight of the absorption bottle is weighed at regular intervals. If the weight of the absorption bottle does not change, it can be considered that the absorption has reached equilibrium. The final CO absorbed 2 is 3.37g. The absorbed system was regenerated at 101 °C for 20 min, and the regeneration rate was 47.02%.

[0039] Control the absorption temperature, absorption pressure, stirring rate, absorbent quality, amine activator q...

Embodiment 3

[0042] Mix 50g N-methylcyclohexylamine MCA (mass fraction 10%) with 75g deionized water (mass fraction 15%), add it to 375g [Bmim][OAc] ionic liquid preset in a beaker, stir evenly, and obtain absorbent. Measure 50g of the absorbent and put it in an absorption bottle. After the absorption bottle is placed in a constant temperature water bath at 40°C for 10 minutes, the pressure is set to normal pressure, and the CO2 is 16.35mL / min. 2 and 120mL / min of N 2 The composition simulated coal-fired flue gas is introduced into the absorption bottle, and the weight of the absorption bottle is weighed at regular intervals. If the weight of the absorption bottle does not change, it can be considered that the absorption has reached equilibrium. The final CO absorbed 2 is 1.47g. The absorbed system was regenerated at 101 °C for 20 min, and the regeneration rate was 50.38%.

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Abstract

The invention discloses an absorbent used to capture or separate carbon dioxide. The absorbent is composed of ionic liquid 1-butyl-3-methylimidazolium acetate and amine water solution, wherein the mass percentage of the 1-butyl-3-methylimidazolium acetate is between 50% and 80%, the amine is piperazine or N-methylcyclohexylamine (MCA), the mass percentage of the amine is between 5% and 15%, the rest material is water and the mass percentage of the water is between 10% and 35%. The absorbent has the advantages of rapid CO2 absorbing speed, large absorption capacity, low regeneration energy consumption, strong stability, slow degradation and small volatility. Furthermore, because of the constitutive characteristics of the absorbent, the absorbent can be used to decarburize in various occasions, and can also be applied to industrial amplification.

Description

technical field [0001] The invention belongs to the field of carbon dioxide capture and separation, and in particular relates to an absorbent for capturing or separating carbon dioxide and its application. Background technique [0002] CO 2 The greenhouse effect and extreme climate phenomena caused by excessive emissions pose a serious threat to the sustainable development of my country's environment. The emissions of thermal power plants have been stable at about 37% of the total emissions for a long time. The development of CO2 for fossil fuel power plants 2 Capture technology is the key to controlling my country's CO 2 Effective measure of total emissions. [0003] Fossil fuel power plants have large flue gas flow, CO 2 The partial pressure is low, the tail flue gas pressure after desulfurization is about 1 bar, and the temperature is between 40°C and 60°C. The research shows that considering the maturity, economy and applicability of the technical method, the chemica...

Claims

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Application Information

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IPC IPC(8): B01D53/14
CPCY02C10/06Y02A50/20Y02C20/40
Inventor 朱德臣徐齐胜方梦祥湛志钢
Owner GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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