Study on characteristics of CO<sub>2</sub> hydrate formation in activated carbon + THF solution system

KUANG Ruogu; WU Liangmeng; XIE Fengmei; ZHONG Dongliang

doi:10.12434/j.issn.2097-2547.20230259

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Study on characteristics of CO₂ hydrate formation in activated carbon + THF solution system

- Study on characteristics of CO₂ hydrate formation in activated carbon + THF solution system
- Vol. 48, Issue 5, Pages: 109-114(2023)
- 作者机构：
  
  1.重庆大学煤矿灾害动力学与控制全国重点实验室，资源与安全学院，重庆 400044
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20230259
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KUANG Ruogu, WU Liangmeng, XIE Fengmei, et al. Study on characteristics of CO₂ hydrate formation in activated carbon + THF solution system. [J]. Low-carbon Chemistry and Chemical Engineering 48(5):109-114(2023)
DOI：

KUANG Ruogu, WU Liangmeng, XIE Fengmei, et al. Study on characteristics of CO₂ hydrate formation in activated carbon + THF solution system. [J]. Low-carbon Chemistry and Chemical Engineering 48(5):109-114(2023) DOI： 10.12434/j.issn.2097-2547.20230259.

摘要

水合物法捕集CO,2,具有储气量大、生成条件温和等显著优点，应用前景广阔。提高水合物生成速率和CO,2,气体消耗量是该方法需解决的关键问题。在活性炭+ THF溶液体系中开展了CO,2,水合物生成特性研究，探究了THF溶液浓度（物质的量分数，下同）、THF溶液饱和度对CO,2,气体消耗量的影响，并通过可视显微实验研究了活性炭+ THF溶液体系中CO,2,水合物的生长形貌特征。研究结果表明，相比于THF溶液浓度为5.56%的体系，活性炭+ THF溶液体系（THF溶液浓度为5.56%、溶液饱和度为100%）的CO,2,气体消耗量增加了59%；当THF溶液饱和度为100%时，提高THF溶液浓度可以有效促进水合物生长，在THF溶液浓度为5.56%的条件下，CO,2,气体消耗量达到总CO,2,气体消耗量90%所需的时间（,t,90,）最短（106.67 min）。活性炭+ THF溶液体系中的CO,2,水合反应由气体吸附和水合物生长两个阶段组成，水合物最初形成于活性炭颗粒/溶液界面并逐渐填充活性炭颗粒间隙；当THF溶液浓度为5.56%时，CO,2,气体消耗量随THF溶液饱和度增加而降低，在THF溶液饱和度为40%的条件下的CO,2,气体消耗量最大，对应的,t,90,最短（23.5 min）。

Abstract

The gas hydrate-based technology has been recognized as a promising technology for CO,2, capture. It has the advantages of large gas storage capacity, mild formation conditions, and so on. Increasing hydrate formation rate and CO,2, gas consumption are critical issues that need to be solved. The formation characteristics of CO,2, hydrate in the activated carbon + THF solution system were studied. The effects of THF solution concentration (mole fraction, the same below) and THF solution saturation on CO,2, gas consumption were explored. In addition, the growth morphology of CO,2 ,hydrate formation in the activated carbon + THF solution system was investigated through the visual microscopic experiment. The results show that, compared with the system with the THF solution concentration of 5.56%, CO,2, gas consumption obtained in the activated carbon + THF solution system (THF solution concentration is 5.56%, THF solution saturation is 100%) is increased by 59%. When the THF solution saturation is 100%, hydrate growth is found to be promoted with the increase of THF solution concentration. The time required for CO,2 ,gas consumption to reach 90% of the total CO,2, gas consumption (,t,90,) is the shortest (106.67 min) with THF solution concentration is 5.56%. CO,2, hydrate formation in the activated carbon + THF solution system is composed of the two stages of CO,2, adsorption and CO,2, hydrate formation. CO,2, hydrate initially forms form at the interface of activated carbons particles and solution, and then gradually fills the interstitial spaces of the activated carbon particles. When the THF concentration is 5.56%, CO,2, gas consumption decreased with the increase of THF solution saturation. The CO,2, gas consumption is the largest under the condition of THF solution saturation 40%, and the corresponding ,t,90, is the shortest (23.5 min).

关键词

气体水合物CO2捕集吸附-水合耦合法THF溶液活性炭

Keywords

gas hydratesCO2 captureadsorption-hydration coupling methodTHF solutionactivated carbons

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Study on characteristics of CO2 hydrate formation in activated carbon + THF solution system

DOI：10.12434/j.issn.2097-2547.20230259

摘要

Abstract

关键词

Keywords

references

Study on characteristics of CO₂ hydrate formation in activated carbon + THF solution system