Solubility controlled permeation of hydrocarbons: new membrane materials and resultsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 30 апреля 2017 г.
Аннотация:Polymers of different classes are considered as membrane materials for separation of hydrocarbons C1–C4. It has been known for a long time that solubility controlled permeation is characteristic of rubbery polymers and in particular of the most permeable rubber polydimethylsiloxane.The transport properties of these polymers are considered. Discovery of poly(trimethylsilylpropyne)and other polyacetylenes showed that similar properties can be revealed in glassy polymers.As is discussed in this review,the most important properties are reduction of the permeability of light components(CH4) in the presence of more condensable penetrant(C4H10) and higher selectivity of mixture separation ascompared with ideal
separation factors measured in the experiments with pure gases.Recently,two other classes of glassy polymers with solubility controlled permeation were discovered:addition type Si-containingnorbornene polymers and metathesis polynorbornenes with flexible Si–O bonds inside groups.The transport properties of these novel polymers are considered in detail.It was shown that for the former group of norbornene polymers the reasons for solubility controlled permeation is great and opened porosity just as is the case for polyacetylenes.For the latter group,the presence of flexible Si–O bonds inside groups is responsible for their transport properties