【作者】 李喜；

【导师】 周理；

【作者基本信息】 天津大学 ， 化学工程， 2005， 硕士

【摘要】 本实验的主要目的是找到一种分离二氧化碳和甲烷的优良吸附剂。在实验中,作者为了得到更高纯度的气体,采用了吸收和吸附法联合作用原理,试探了载液膜吸附剂的分离效果。通过CH₄/CO₂混合气在两种活性炭和一种硅胶上的穿透曲线,计算出分离系数作为选择吸附剂的尺度。考虑到涂渍后吸附剂的稳定性,实验中采纳了高沸点的三乙醇胺作为吸收剂对硅胶表面进行改性。在实验中采用动态法测量了CH₄/CO₂混合气在4种涂有不同浓度三乙醇胺的硅胶上的穿透曲线,通过分析它们的分离因子了解它们的分离效果。并以甲烷为再生气,测量了最佳涂渍浓度时不同压力下的脱附效果。在最佳压力下测量了吸附剂的再生情况,以了解吸附剂的稳定性。通过以上实验发现:涂渍15%三乙醇胺的硅胶分离效果最好,分离效果随着压力的升高而降低,2atm时分离系数能达到14。在2atm下做再生实验发现:再生后的穿透曲线基本重合,说明吸附剂非常稳定。所以,涂渍15%三乙醇胺的硅胶是一种用来分离CH₄/CO₂混合气的优良吸附剂。更多还原

【Abstract】 The main object of the work was to find an excellent adsorbent to separate themixture of CO₂ and CH4. To get highly purified methane, a combinative action principleof absorbability method and pressure swing adsorption was performed, and at one timethe separation effect of CO₂/CH₄ on adsorbent with liquid film was measured. Based onthe breakthrough curve of the mixture of CO₂ and CH4, the separation coefficient wascalculated as the rule of selecting adsorbent. TEA is selected as the sorbent to modify thesurface of silica gel for its high boiling point, considering the stability of the adsorbentwith liquid film. The breakthrough curves of the mixture of CO₂ and CH4 on the silica gelwith four different concentrations of TEA were monitored through dynamic method, andthe separation effect could be analyzed through their separation coefficient. At the sametime, the desorption effect is monitored under the optimum concentration and differentpressures, when the methane was taken as regeneration gas. Then, at the optimumpressure the regenerative capacity of adsorbent was measured to obtain the stability of theadsorbent.From above experiment it was shown that the silica gel which surface was spreadwith 15% TEA has the best selectivity, which separation coefficient can reach 14 at2atm.In addition, the separetion coefficient drop when pressure rise. The regenerationexperiments were further undertaken under the same condition, and a agreement ofbreakthrough curves after regeneration was found, which show silica gel spreaded 15%TEA is very stable. Therefore, it could be showed the silica gel spread with 15% TEA wasan excellent adsorbent to separate the mixture of CO₂ and CH4.更多还原