Abstract:

Biphasic solvents have a promising application prospect own to the lower regeneration energy consumption character. However, complex screening works usually need to be done when new physical-chemical biphasic solvents were developed. In order to solve this problem, this paper firstly selected different water-soluble physical solvents and amino groups amines, and then carried out absorption, phase separation and regeneration experiments in turn using a small experimental device to explore the effects of water-soluble and amino groups on the performance of biphasic solvent. It was found that the water solubility of the physical solvent had no obvious regular relationship with the absorption and regeneration performance of the solution, but the biphasic solvent composed of hydrophobic physical solvent had lower rich phase ratio and higher rich phase CO₂ ratio. The solution containing only tertiary amino group had good regeneration performance, but the absorption rate increased slightly and the absorption load decreased compared with the aqueous amine solution. The type of amino group had little effect on the phase separation performance, but the number of amino groups affected the change range of rich phase ratio.

Key words: CO₂ capture, chemical absorption, biphasic solvent, water-solubility, amino type

摘要：

相变吸收剂的再生能耗较低，具有良好的应用前景，但目前物理溶剂型相变吸收剂的开发都伴随着大量的筛选工作。为解决此问题，本文选取了不同水溶性的物理溶剂和氨基种类的有机胺，利用实验室搭建的小型实验装置，依次进行吸收、分相和再生实验，探究水溶性及氨基种类对相变吸收剂性能的影响，为后续的筛选工作提供一定的理论依据。研究发现：物理溶剂的水溶性与溶液的吸收和再生性能无明显规律性的关系，但疏水型物理溶剂组成的相变吸收剂具有更低的富相比例和更高的富相CO₂比例；只含叔氨基的溶液再生性能好，但相比于有机胺水溶液吸收速率提升幅度小、吸收负荷出现降低；氨基种类对分相性能影响不大，但氨基数目影响着富相比例的变化幅度。

关键词: CO₂捕集, 化学吸收, 相变吸收剂, 水溶性, 氨基种类