| 基于pH测量的CO2吸收到钠基溶液动态实验及模型 |
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| 引用本文： | 刘敦禹,程潜,金晶. 基于pH测量的CO2吸收到钠基溶液动态实验及模型[J]. 化工进展, 2018, 37(Z1): 35-42. DOI: 10.16085/j.issn.1000-6613.2018-0869 |
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| 作者姓名： | 刘敦禹 程潜 金晶 |
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| 作者单位： | 上海理工大学能源与动力工程学院, 上海 200093 |
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| 基金项目： | 上海市浦江人才项目（16PJ1407900）。 |
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| 摘 要： | 采用基于pH测量的CO2吸收速率研究方法。将pH与溶液中的成分相关联，采用分段拟合获得CO2吸收速率，获得溶液成分对吸收速率的影响规律。对于低浓度的NaOH来说，吸收速率一直保持不变直到CO2物理吸收到NaHCO3溶液中。对于高浓度的NaOH，NaOH完全转化成Na2CO3时，吸收速率降低。但在两个吸收阶段中，吸收速率不变，CO2物理吸收到NaHCO3中时，吸收速率随CO2饱和度的增加而降低。对CO2吸收到NaOH中，CO2和钠离子浓度都促进吸收，钠离子浓度影响更大；对于CO2吸收到Na2CO3中，当Na2CO3浓度大于0.05mol/L，吸收速率不随浓度增加；对于CO2吸收到NaHCO3中，低浓度的钠可以促进CO2吸收，而高浓度的钠抑制CO2吸收，这主要由于析盐的作用。为避免CO2大量吸收，优先选择0.5mol/L以上浓度的NaHCO3。
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| 关 键 词： | 二氧化碳 吸收 反应动力学 模型 |
| 收稿时间： | 2018-04-26 |
Experimental and modeling study on dynamic CO2 gas absorption into sodium solutions based on pH measurement |
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| LIU Dunyu,CHENG Qian,JIN Jing. Experimental and modeling study on dynamic CO2 gas absorption into sodium solutions based on pH measurement[J]. Chemical Industry and Engineering Progress, 2018, 37(Z1): 35-42. DOI: 10.16085/j.issn.1000-6613.2018-0869 |
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| Authors: | LIU Dunyu CHENG Qian JIN Jing |
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| Affiliation: | School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China |
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| Abstract: | pH measurement was adopted to obtain the absorption rate of CO2. Liquid composition was correlated to the dynamic change of pH. Piecewise fitting was further used on liquid composition to obtain the CO2 absorption rate. Therefore, the liquid composition on the absorption rate of CO2 was then achieved. For low concentration sodium hydroxide, the absorption rate of CO2 does not change until CO2 physical absorbed into NaHCO3. While for high concentration NaOH, CO2 absorption rate decreases when NaOH is fully converted to Na2CO3. However, within the two stages of absorption, CO2 absorption rate does not change. When CO2 is absorbed into NaHCO3, CO2 absorption rate decreases with the increase of saturation state for the solution. As for CO2 absorption into NaOH, both CO2 and sodium concentration promote the absorption, with more influence by sodium concentration; For CO2 absorption into Na2CO3, the absorption rate does not increase when the concentration of Na2CO3 is higher 0.05mol/L; For CO2 absorption into NaHCO3, low concentration NaHCO3 promotes the absorption of CO2 while high concentration of NaHCO3 inhibits CO2 absorption due to salt-out effect. To reduce CO2 absorption into solutions, high concentration of NaHCO3 larger than 0.5mol/L is preferable. |
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| Keywords: | carbon dioxide absorption chemical kinetics model |
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