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A kind of carbon dioxide adsorbent and its preparation method and application

A carbon dioxide and adsorbent technology, which is applied in the field of carbon dioxide adsorbent preparation, can solve the problems of large loading capacity of ionic liquids, high cost of adsorbents, and low adsorption capacity, so as to reduce the cost of adsorption and capture, save reagents, and increase adsorption capacity. Effect

Inactive Publication Date: 2021-02-09
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can reduce the viscosity of the ionic liquid and improve the stability of the adsorbent and the rate of adsorption and desorption, the adsorbent prepared by this method still has high cost and CO 2 The problem of low adsorption capacity
Cheng et al. (CO 2 Adsorption Performance of Ionic Liquid [P66614][2-Op] Loaded onto MolecularSieve MCM-41 Compared to Pure Ionic Liquid in Biohythane / Pure CO 2 Atmospheres, Energy Fuels, 30, 3251−3256, 2016) Loading ionic liquids into mesoporous silica for CO 2 Adsorption, found in a short time CO 2 The adsorption rate has been significantly improved, but the adsorption capacity has not exceeded the liquid ionic liquid itself, and the ionic liquid has a large loading capacity and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of biochar:

[0038] Wash and dry 30g of walnut shells, vacuum carbonize at 600°C, crush, and sieve into 250-mesh powder (A); wash and dry 30g of pine wood chips, vacuum carbonize at 500°C, crush, and sieve into 250-mesh powder (A) B); mix (A) and (B) at a ratio of 30%:70%, and then place it in an ultrasonic oscillator filled with deionized water at 30°C for 10 minutes, ultrasonic frequency 20KHz, filter and dry C is obtained; C is placed in a solution of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride with a concentration of 1 mol / L and modified by heating at reflux at 100°C for 8 hours, and pumping Filter and dry at 100° C. for 10 hours to obtain 17 g of biochar.

[0039] (2) Preparation of loaded adsorbent:

[0040] Weigh 0.8g of organic amine and 0.2g of ionic liquid into 5ml of deionized water, stir at room temperature for 30 minutes, then weigh 1g of biochar, put it into the mixed solution of organic amine, ionic liquid and water, and...

Embodiment 2

[0045] (1) Preparation of biochar:

[0046] Wash and dry 40g of walnut shells, vacuum carbonize at 600°C, pulverize, and sieve into 250-mesh powder (A); wash and dry 35g of pine wood chips, vacuum carbonize at 500°C, crush, and sieve into 250-mesh powder (A) B); mix (A) and (B) at a ratio of 40%:60%, then place in an ultrasonic oscillator filled with deionized water at 40°C for 15 minutes, ultrasonic frequency 25KHz, filter and dry Obtain C; place C in a 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride solution with a concentration of 2 mol / L, heat and reflux at 100°C for 8 hours, and pump Filter and dry at 100° C. for 10 hours to obtain 20 g of biochar.

[0047] (2) Preparation of loaded adsorbent:

[0048] Weigh 1g of organic amine and 0.2g of ionic liquid into 5ml of deionized water, stir at room temperature for 30 minutes, then weigh 1g of biochar, put it into the mixed solution of organic amine, ionic liquid and water, and continue to Stir and impregnate for...

Embodiment 3

[0053] (1) Preparation of biochar:

[0054] Wash and dry 35g of walnut shells, vacuum carbonize at 600°C, crush, and sieve into 250-mesh powder (A); wash and dry 50g of pine wood chips, vacuum carbonize at 500°C, crush, and sieve into 250-mesh powder ( B); mix (A) and (B) at a ratio of 45%:55%, and then place it in an ultrasonic oscillator filled with deionized water at 50°C for 15 minutes of ultrasonic radiation at an ultrasonic frequency of 25KHz, filter and dry C is obtained; C is placed in a solution of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride with a concentration of 2.2 mol / L and modified by heating at reflux at 100°C for 8 hours, Suction filtration and drying at 100° C. for 10 hours yielded 22 g of biochar.

[0055] (2) Preparation of loaded adsorbent:

[0056] Weigh 1.02g of organic amine and 0.18g of ionic liquid into 5ml of deionized water, stir at room temperature for 30 minutes, then weigh 1g of biochar, put it into the mixed solution of organic...

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Abstract

The invention discloses a carbon dioxide adsorbent, its preparation method and application, and belongs to the technical field of carbon dioxide adsorbent. The adsorbent is composed of organic amines, ionic liquids and biochars; among them, biochars account for 40-60%, organic amines account for 30-50%, and ionic liquids account for 5-10%. The preparation method is as follows: stir and impregnate the mixed aqueous solution of biochar, organic amine and ionic liquid at room temperature for 5-8 hours, then ultrasonically treat in an ultrasonic oscillator for 2-3 hours, and place the obtained mixture in a liquid solution at -196°C. Freeze in nitrogen for 20-30 minutes, and then freeze-dry the mixture in a freeze dryer at -65°C for 24-48 hours to prepare the carbon dioxide capture adsorbent. The good dispersibility and stability of the organic amine and the ionic liquid in the invention make the adsorbent have the characteristics of strong adsorption capacity, high cycle stability and low cost, and can efficiently capture carbon dioxide.

Description

technical field [0001] The invention relates to a method for preparing an efficient and stable carbon dioxide adsorbent, belonging to the technical field of carbon dioxide adsorbent preparation. Background technique [0002] With the development of economy and society, the amount of man-made carbon dioxide emissions in the atmosphere continues to increase. The accumulation of carbon dioxide in the atmosphere can lead to many climate and environmental disasters. For example, global warming, sea level rise and land desertification, etc. At the same time, as a potential carbon resource, carbon dioxide has a wide range of applications in the fields of chemistry and agriculture. Therefore, CO2 capture and sequestration is the best option for mitigating current greenhouse gas emissions and recovering this potential carbon resource. In particular, capturing and separating CO2 from large-scale flue gas sources such as coal-fired power plants and cement plants is critical to reduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/32B01J20/30B01D53/02
CPCB01D53/02B01D2257/504B01J20/20B01J20/22B01J20/3204B01J20/3248Y02C20/40
Inventor 赵培玉张国杰徐英孙映晖张永发
Owner TAIYUAN UNIV OF TECH
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