Uma Maheswari A, Palanivelu K
Centre for Environmental Studies, Anna University, Chennai, 600 025, India.
Centre for Climate Change and Adaptation Research, Anna University, Chennai, 600 025, India.
Environ Sci Pollut Res Int. 2017 Feb;24(6):5733-5745. doi: 10.1007/s11356-016-8306-5. Epub 2016 Dec 30.
In this present work, the absorption of CO in alkyl amines and vegetable oil mixture has been evaluated. The results showed that the absorption is higher in alkyl amines and vegetable oil mixture compared with the aqueous alkyl amines. In addition to that, by employing the greener and non-toxic vegetable oil media, the CO gas has been captured as well as converted into value-added products, such as carbamates of ethylenediamine, diethylenetriamine, and triethylenetetramine. The carbamates have been isolated and characterized by Fourier transform infrared and H and C nuclear magnetic resonance spectroscopic techniques. The formation of these products in precipitate form has not been observed in the case of aqueous medium. Among the various alkyl amine and vegetable oil combinations, triethylenetetramine in coconut oil medium showed the maximum CO capture capacity of 72%. The coconut oil used for the process has been recovered, recycled, and reused for 3 cycles. Thus, this novel scheme seems to be a better alternative to conquer the drawback of aqueous amine-based CO capture as well as for the capture and utilization of the CO gas to gain the value-added products.
在本研究中，对一氧化碳在烷基胺与植物油混合物中的吸收情况进行了评估。结果表明，与烷基胺水溶液相比，一氧化碳在烷基胺与植物油混合物中的吸收量更高。此外，通过使用更环保且无毒的植物油介质，一氧化碳气体不仅被捕获，还被转化为增值产品，如乙二胺、二乙烯三胺和三乙烯四胺的氨基甲酸盐。这些氨基甲酸盐已通过傅里叶变换红外光谱和氢及碳核磁共振光谱技术进行了分离和表征。在水介质中未观察到这些产物以沉淀形式形成。在各种烷基胺与植物油的组合中，椰子油介质中的三乙烯四胺对一氧化碳的捕获能力最高，达72%。用于该过程的椰子油已被回收、循环利用，并重复使用了3个周期。因此，这种新方案似乎是克服基于胺水溶液的一氧化碳捕获缺点以及捕获和利用一氧化碳气体以获得增值产品的更好选择。
