LIQUID PERMEATION THROUGH PLASTIC FILMS.
Abstract
Liquid permeation through plastic films promises to be a valuable technique for the separation of organic compounds. The overwhelming drawback of the process is the inability of current knowledge to predict what type of film is required for a particular separation. This effort has been aimed at acquiring a better understanding of the process to enable such prediction. Desorption of n-hexane, n-heptane, and n-octane from films of polypropylene in vacuum at 30, 40, and 50C was measured by following sample weight change. A digital computer program was developed to treat the data by solving the unsteady-state permeation-rate equation while including the experimental dependence of the diffusivity on concentration. In order to establish the dependence of diffusivity on vapor concentration, work was begun with the time-lag method. The variation of the diffusivity with permeant pressure was followed for the diffusion of n-hexane through polypropylene. The swelling of polypropylene in liquid and vaporous n-hexane was also studied. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1968
- Accession Number
- AD0832286
Entities
People
- Robert F. Sweeny
Organizations
- Villanova University