Abstract: Experiments for CO2 separation from flue gas (CO2/N2) are conducted with the one-stage hydrate method using TBAB (tetra-n-butyl ammonium bromide，C16H36NBr) and CP (cyclopentane，C5H10) as joint additives. The effects of TBAB and TBAB/CP on hydrate formation and separation efficiency were investigated and compared. The suitable conditions of 276.15 K and 2.0—3.3 MPa along with initial liquid gas volume ratio of 0.78 and the CP volume concentration of 0.6 % were obtained. Under such conditions，the gas uptake with TBAB/CP joint additives was 1.5—2.0 times higher than that in TBAB solution. Meanwhile，the CO2 concentration in residual gas phase could be decreased from 17% to 7%. The split fraction of 60%—70% was also higher than that of 40%—50% in pure TBAB solution. The result demonstrated that TBAB/CP system was evidently helpful for hydrate-based CO2 capture from the flue gast.

Key words: CO2 separation, hydrate, tetra-n-butyl ammonium bromide （TBAB）, cyclopentane （CP）, flue gas, separation efficiency

摘要： 在四正丁基溴化铵（TBAB）和环戊烷（CP）双添加剂体系下进行了一级水合物法分离烟气中CO2的研究。对比了纯体系和双添加剂体系对水合物生成过程及分离效果的影响。获得了合适的操作条件（温度276.15 K，压力2.0～3.3 MPa）、初始液气比（0.78）、添加剂浓度（CP体积分数为0.6%）。在合适条件下，双添加剂体系相比纯TBAB体系水合过程的载气量达至1.5～2.0倍，剩余气相中CO2摩尔分数由17%降至7%，去除率由40%～50%上升到60%～70%。实验表明，双添加剂体系在水合物法CO2分离技术的分离效果及节能方面存在潜力，为工业化水合物法净化烟气提供了参考和标准。

关键词: CO2分离, 水合物法, 四正丁基溴化铵, 环戊烷, 烟气, 分离效率