Increasing energy demand in the world leads to more electricity generation mainly at fossil fuel power plants. Greenhouse gases are thus produced and mostly emitted to the atmosphere directly, resulting in global warming and climate change. Carbon dioxide is believed to be a main pollutant among greenhouse gases responsible from global warming. Conventional systems using mostly amine solutions to capture carbon dioxide at the source have some disadvantages, and alternatives are constantly being searched. In this work, a benign system of aqueous calcium acetate solution was investigated for this purpose. Calcium acetate is easy to produce, relatively cheap, environmentally friendly, nonhazardous, and noncorrosive. These properties make it a great alternative for use in capturing carbon dioxide. This absorption process is accompanied by chemical reaction. Therefore, the reaction kinetics needs to be investigated before its use in absorbers. A stirred cell reactor was used in the experiments using aqueous calcium acetate solution of different concentrations (2‐20% w/w) and different carbon dioxide concentrations in gas mixtures (4.5‐100% v/v dry carbon dioxide) at temperatures ranging from 286 to 352 K. The Gibbs free energy change for the overall reaction between carbon dioxide and aqueous calcium acetate solution was found to be –2.75 kJ/mol that shows the reaction is exergonic and occurs spontaneously. It was also found out that the reaction is pseudo–first order with respect to carbon dioxide which was also proven by calculating the Hatta number. Activation energy and Arrhenius (frequency) constant were also determined experimentally.

中文翻译：

---

乙酸钙水溶液中二氧化碳的化学吸收动力学

世界上能源需求的增加导致主要在化石燃料发电厂的发电量增加。这样就产生了温室气体，并且大部分直接排放到了大气中，导致了全球变暖和气候变化。人们认为二氧化碳是导致全球变暖的温室气体中的主要污染物。传统的系统主要使用胺溶液从源头捕获二氧化碳，但存在一些缺点，并且正在不断寻找替代方法。在这项工作中，为此目的研究了醋酸钙水溶液的良性体系。乙酸钙易于生产，相对便宜，对环境友好，无害且无腐蚀性。这些特性使其成为捕获二氧化碳的绝佳选择。该吸收过程伴随有化学反应。因此，在将其用于吸收器之前，需要研究反应动力学。在实验中使用搅拌池反应器，使用不同浓度（2-20％w / w）和混合气体中二氧化碳浓度不同（4.5-100％v / v干二氧化碳）的乙酸钙水溶液，温度范围为介于286至352 K之间。发现二氧化碳与乙酸钙水溶液之间的整个反应的吉布斯自由能变化为–2.75 kJ / mol，表明该反应是强力的，是自发发生的。还发现该反应相对于二氧化碳是伪一级反应，这也通过计算哈达数得到证明。还通过实验确定了活化能和阿累尼乌斯（频率）常数。