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A kind of viscosity control method based on 1-butyl-3-methylimidazole acetate [bmim][oac] carbon dioxide absorbent

A technology of methylimidazole acetate and viscosity control, applied in the field of carbon dioxide capture and separation, to achieve the effect of improving CO2 absorption rate and absorption capacity

Active Publication Date: 2017-01-11
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Viscosity testing and control of [Bmim][Oac] benchmark absorbent is also not involved

Method used

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  • A kind of viscosity control method based on 1-butyl-3-methylimidazole acetate [bmim][oac] carbon dioxide absorbent
  • A kind of viscosity control method based on 1-butyl-3-methylimidazole acetate [bmim][oac] carbon dioxide absorbent
  • A kind of viscosity control method based on 1-butyl-3-methylimidazole acetate [bmim][oac] carbon dioxide absorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh 100g of [Bmim][OAc] ionic liquid, add it into a beaker, and stir evenly to obtain a pure ionic liquid absorbent. No viscosity modifiers are added.

[0041] (1) Take an appropriate amount of absorbent sample, control the sample temperature at 35°C, change the shear stress within 1-100 Pa, and verify the change of viscosity with shear stress through experiments. The experiment shows that the viscosity of the absorbent sample has little effect on the shear stress, which is maintained at about 162mPas. With the increase of the shear stress, the viscosity of the tested sample decreases due to the action of inertia and centrifugal force;

[0042] (2) Take an appropriate amount of absorbent sample, control the shear stress to 10Pa, and verify the change of viscosity with temperature by experiment. The experiment shows that the viscosity of the absorbent sample decreases with the increase of temperature, and the corresponding viscosities at 25°C, 35°C, 50°C, 80°C, and 10...

Embodiment 2

[0044] Weigh 3 parts of 100g [Bmim][OAc] ionic liquid, add 3 independent beakers to preset, add 11.11g, 25g, 66.67g water to the preset liquid respectively, stir well, and get the water mass fraction of 10%, 20% % and 40% of three different solvent systems. Take an appropriate amount of absorbent sample, control the shear stress to 10Pa, and verify the change of viscosity with temperature in the experiment; the experiment shows that: 1) The viscosity of the absorbent sample decreases with the increase of temperature, 2) The viscosity of the absorbent sample decreases with the increase of the water mass fraction. increase and decrease; when 11.11g of water is added at 5°C, 15°C, 25°C, 35°C, and 55°C, the corresponding viscosities are 181.58mPa.s, 88.69mPa.s, 48.35mPa.s, 29.73mPa.s and 15.06mPa.s; when 25g of water is added at 5°C, 15°C, 25°C, 35°C, and 55°C, the corresponding viscosities are 71.18mPa.s, 42.74mPa.s, 26.7mPa.s, 17.74mPa.s, and 9.4 mPa.s; when 66.67g of water is ...

Embodiment 3

[0048] Weigh 3 parts of 100g [Bmim][OAc] ionic liquid, add 3 independent beakers to preset, add 11.11g, 25g, 66.67g MCA to the preset liquid respectively, stir well, and get the mass fraction of MCA as 10%, 20% and 40% of three different solvent systems. Take an appropriate amount of absorbent sample, control the shear stress to 10Pa, and verify the change of viscosity with temperature in the experiment; the experiment shows that the viscosity of the absorbent sample increases first and then decreases with the increase of MCA mass fraction, but relative to the same mass fraction of water, Its viscosity reduction is relatively small. At 5°C, 15°C, 25°C, 35°C, 45°C and 55°C, the viscosities corresponding to adding 11.11g of MCA are 767.72mPa.s, 348.99mPa.s, 181.77mPa.s, 103.80mPa.s, 63.38mPa.s respectively and 40.38mPa.s; at 5°C, 15°C, 25°C, 35°C, 45°C and 55°C, the viscosities corresponding to adding 25gMCA are 925.80mPa.s, 387.41mPa.s, 198.5mPa.s, 111.01mPa.s respectively , ...

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Abstract

The invention discloses a viscosity control method for a carbon dioxide absorbent based on 1-butyl-3-methylimidazolium acetate [Bmim] [Oac]. The viscosity control method comprises the step of adding a viscosity modifier into pure 1-butyl-3-methylimidazolium acetate [Bmim] [Oac] ionic liquid, wherein the viscosity modifier is water and / or N-methylcyclohexylamine (MCA). According to the viscosity control method, a main way of adding water or a specific organic amine activator into the ionic liquid is adopted, the viscosity of the absorbent is controlled to be in a reasonable range, the carbon dioxide removal efficiency of the ionic liquid is improved, and meanwhile, the viscosity of the absorbent can be effectively reduced, so that the popularization and application of the ionic liquid are promoted, and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of carbon dioxide capture and separation, in particular to a method for controlling the viscosity of 1-butyl-3-methylimidazole acetate [Bmim][Oac] ionic liquid carbon dioxide absorbent for capturing or separating carbon dioxide . Background technique [0002] CO 2 Capture, utilization and storage (CCUS) technology is an effective means to deal with the global greenhouse effect and extreme climate phenomena. According to my country's national conditions, coal-fired power plants are CO 2 The focus of emissions is stationary sources. For coal-fired power plants with large flue gas flow, CO 2 Due to the characteristics of low partial pressure and complex flue gas components, compared with the maturity, economy and applicability of technical methods, chemical absorption method is a better choice. In order to solve the problem of high energy consumption in the current chemical absorption process, it is necessary to fur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/62
CPCY02A50/20Y02C20/40
Inventor 朱德臣徐齐胜方梦祥廖宏楷湛志钢
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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