Zhoulan Huang, Guoxiong Zhan, Lei Xing, Bingling Yuan, Xuebing Liu, Yongpeng Zhang, Yongfeng Bai, Zhen Chen, Junhua Li
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引用次数: 0
摘要
使用双相溶剂进行二氧化碳(CO2)化学吸附一直被认为是一种前景广阔的方法,但在实际应用过程中实现高效的动态相分离仍面临挑战。为了解决这个问题,我们创新性地采用了离心力来增强双相溶剂中不相溶的细微液滴的凝聚和分离。综合评估结果表明,离心分相技术具有出色的分离效率(大于 95%),并且对各种溶剂都有很好的适用性。相关分析表明,富相粘度、贫相残留 CO2 与相分离效率之间存在密切联系。通过相分裂的显微镜图像观察不相溶液滴的时间轮廓行为,可以估计离散相的增长和凝聚率。用于技术和经济分析的工业规模过程模拟证实,与传统方法相比,使用双相溶剂和离心分离器,总捕获成本(42.5 美元/吨二氧化碳)可降低 22%。该研究从一个全新的角度介绍了极性诱导簇生成和凝固诱导分离,为解决实际应用中与双相溶剂中动态相分裂相关的挑战提供了有效的解决方案。
Efficient Dynamic Phase Splitting Driven by Centrifugal Force for CO2 Capture from Flue Gas using Biphasic Solvents.
Carbon dioxide (CO2) chemisorption using biphasic solvents has been regarded as a promising approach, but challenges remain in achieving efficient dynamic phase-splitting during practical implementation. To address this, the centrifugal force was innovatively adopted to enhance the coalescence and separation of immiscible fine droplets within the biphasic solvent. The comprehensive evaluation demonstrates that centrifugal phase-splitting shows outstanding separation efficiency (>95%) and excellent applicability for various solvents. Correlation analysis reveals a strong relationship between the rich phase's viscosity, lean phase's residual CO2, and the phase separation efficiency. The time-profile behavior of immiscible droplets, observed through microscope images of phase-splitting, enables the estimation of the growth and coalescence rates of the discrete phase. Industrial-scale process simulation for technical and economic analysis confirms that the total capture cost ($ 42.5/t CO2) can be reduced by ∼22% with the use of biphasic solvents and a centrifugal separator compared to conventional methods. This study introduces a fresh perspective on polarity-induced cluster generation and coagulation-induced separation, offering an effective solution to address the challenges associated with dynamic phase-splitting in biphasic solvents during practical applications.
期刊介绍:
Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences.
Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.