Department of Chemical Engineering, Nirma University, Ahmedabad, Gujarat, India.
Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India.
Environ Sci Pollut Res Int. 2023 Jan;30(4):8429-8447. doi: 10.1007/s11356-021-17154-6. Epub 2022 Jan 8.
The concentration of carbon dioxide gas has accelerated over the last two decades which cause drastic changes in the climatic conditions. In industries, carbon capture plants use a volatile organic solvent which causes many environmental threats. So, a low-cost green absorbent has been formulated with nontoxicity and high selectivity properties for absorbing carbon dioxide gas. This paper contains the synthesis process along with the structure confirmation using H NMR, C NMR, FT-IR, and mass spectroscopy. Density, viscosity, and diffusivity are measured at different ranges with standard instruments. The kinetic studies were also conducted in a standard predefined-interface stirred cell reactor. The kinetic parameters were calculated at different parameters like agitation speeds, absorption temperature, initial concentrations of ionic liquid, and partial pressure of carbon dioxide. The reaction regime of carbon dioxide absorption is found to be in fast reaction kinetics with pseudo-first-order. The reaction rate and the activation energy of CO absorption are experimentally determined in the range of 299 to 333 K with different initial concentrations of ionic liquid (0.1-1.1 kmol/m). The second-order rate constant and activation energy of carbon dioxide absorption in the synthesized ionic liquid is found to be 9.48 × 10 m mol s and 16.61 kJ mol respectively. On increasing the viscosity of the reacting solvent, the diffusivity of CO gas molecules decreases, and thus the rate of absorption decreases. This solvent has shown great potential to absorb CO at a large scale.
二氧化碳气体的浓度在过去二十年中加速上升，导致气候条件发生了剧烈变化。在工业中，碳捕获工厂使用挥发性有机溶剂，这会对环境造成许多威胁。因此，已经研制出一种低成本的绿色吸收剂，具有无毒和高选择性，可用于吸收二氧化碳气体。本文包含使用 H NMR、C NMR、FT-IR 和质谱法进行的合成过程以及结构确认。使用标准仪器在不同范围内测量密度、粘度和扩散率。还在标准预定义界面搅拌池反应器中进行了动力学研究。在不同参数下（如搅拌速度、吸收温度、离子液体的初始浓度和二氧化碳分压）计算了动力学参数。二氧化碳吸收的反应区被发现为快速反应动力学，具有准一级反应特征。在不同初始浓度的离子液体（0.1-1.1 kmol/m）范围内，在 299 至 333 K 的温度范围内，实验确定了 CO 吸收的反应速率和活化能。在合成离子液体中，二氧化碳吸收的二级速率常数和活化能分别为 9.48×10 m mol s 和 16.61 kJ mol。随着反应溶剂粘度的增加，CO 气体分子的扩散系数降低，因此吸收速率降低。这种溶剂在大规模吸收 CO 方面显示出巨大的潜力。
