Development of Ethyleneglycol Liquid Membranes for the Separation of Various Gas and Vapor Mixtures

采用三甘醇（TEG）液体膜，在微孔疏水膜表面支撑，研究了气体和蒸汽混合物的渗透特性。在进料侧常压、渗透侧真空的条件下，利用平板式膜池进行了蒸汽渗透实验。在烃类分离中，烃类混合蒸汽通过载气进入膜细胞。进料蒸汽由C5-C8烃组成，其中72-87%为芳烃。通过TEG液膜的蒸汽芳香度为98-99%。TEG液膜对汽油蒸气中的芳香成分具有优先渗透作用。C6和C7芳烃对石蜡烃的选择性分别为47和15。在VOC去除实验中，将含有1-2% VOC蒸汽的空气送入液膜电池。TEG液膜对亲水性VOCs、乙醇蒸气等的去除效果与硅橡胶膜相当。对于疏水蒸汽，碳氢化合物蒸汽，去除它们最有效的液体是teg -二丁基醚。

The permeation of gas and vapor mixtures was studied using triethylene glycol(TEG) liquid membranes, which were supported on the surface of a microporous hydrophobia membrane. The vapor permeation experiments were conducted using a flat-type membrane cell under the conditions of atmospheric pressure on the feed side and a vacuum on the permeate side. For the hydrocarbon separation, a hydrocarbon mixed vapor was fed into the membrane cell by a carrier gas. The feed vapor consisted of C5-C8 hydrocarbons, in which 72-87% was aromatic. The vapor that permeated through the TEG liquid membrane was 98-99% aromatic. The TEG liquid membrane showed a preferential permeation for aromatic components in the gasoline vapor. The selectivities for C6 and C7 aromatic hydrocarbons over paraffin hydrocarbons were 47 and 15,respectively. For the VOC removal experiments, an air contained 1-2% VOC vapor was fed to the liquid membrane cell. TEG liquid membrane effectively removed the hydrophilic VOCs, ethanol vapor etc., which efficiency was comparable to a silicone rubber membrane. In the case for the hydrophobic vapors, hydrocarbon vapors, the most effective liquid to remove them was TEG-dibuthylehter.