Study on gas separation by facilitated transport liquid membranes

促进传输液膜气体分离研究

基本信息

批准号：
60550666
负责人：
TERAMOTO Masaaki
金额：
$ 1.09万
依托单位：
Kyoto Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550666/
关键词：
Facilitated transport Carrier transport Liquid membrane Gas separation Supported liquid membrane Ethylene 硝酸銀

项目摘要

Liquid membranes through which gases are transported by the facilitated diffusion mechanism have higher selectivity compared with polymer membranes. In the present study, the transport mechanism of ethylene through supported liquid membrane (SLM) containing <AgNO_3> as a carrier was elucidated. Furthermore, a flowing liquid membrane (FLM), which has higher permeability and stability compared with SLM, was proposed, and its performance was evaluated.In the separation of ethylene from ethane by SLM, the separation factor <(C_2H_4/C_2H_6)_3> increased with increasing carrier concentration, reaching about 1000 when [ <AgNO_3> ] was 4 mol/dm. An approximate method for caclulating the rate of facilitated transport accompanied by instantaneous reversible reaction was proposed. This method is applicable even to the case where the diffusivities of the carrier and the complex differ from each other. The experimentally observed flux of ethylene agreed well with the flux calculated by the approximation method.A flowing liquid membrane cell with three channels for feed gas, carrier solution( <AgNO_3> solution) and strip gas was developed. The channels were separated by hydrophobic microporous membrames. The permeability of gas at high flow rate of carrier solution was about 5 times that of SLM. In the separation of ethylene from ethane, membrane fouling due to the evaporation of the solvent was not observed. When polypropylene membrane was used, however, precipitates, presumably <Ag_2O> , covered the membrane, resulting in low permeability. This fouling was avoided by adding nitric acid to the carrier solution. When Teflon membrane was used, FLM was stable for more than 11 days even without nitric acid. By evacuating strip side of SLM, 98% ethylene was produced. The experimental result was satisfactorily simulated by a permeation model and design equations.

与聚合物膜相比，通过促进扩散机制通过促进扩散机制传输气体的液体膜具有更高的选择性。在本研究中，阐明了通过含有<agno_3>作为载体的支撑液膜（SLM）的乙烯的运输机理。此外，提出了与SLM相比的流动液体膜（FLM），其渗透率和稳定性更高，并评估了其性能。在通过SLM与乙烷分离，SLM分离乙烷，分离因子<（C_2H_4/C_2H_6）_3>随着载体浓度的增加而增加，nol______________ [<agn] [<<agn] [> <agn] [<agn] [<agn] [<agn] 3 [<<agn] [<agn]。提出了一种近似的方法，用于削减伴随瞬时可逆反应的促进运输速率。该方法甚至适用于载体的扩散性和络合物彼此不同的情况。实验观察到的乙烯通量与通过近似方法计算的通量很好地达成了一致。一个流动的液态膜细胞，带有三个用于进料气体的通道，载气溶液（<agno_3>溶液）和带状气体。通过疏水微孔膜分离通道。载气以高流速的载体溶液的渗透性约为SLM的5倍。在乙烯与乙烷分离时，未观察到由于溶剂蒸发而引起的膜结垢。但是，当使用聚丙烯膜时，大概是<Ag_2o>覆盖膜的沉淀物，导致渗透率较低。通过在载体溶液中添加硝酸来避免这种结垢。当使用Teflon膜时，即使没有硝酸，FLM也可以稳定超过11天。通过撤离SLM的带状侧，产生了98％的乙烯。实验结果通过渗透模型和设计方程式令人满意地模拟。