Process for forming hollow fibers
AssigneeThe Standard Oil Company
InventorsEdward F. Steigelmann, Robert D. Hughes, Joseph Gabor
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Abstract
Hollow membrane fibers are formed from a mixture of N-alkoxyalkyl polyamide, polyvinyl alcohol, di(lower alkyl) sulfoxide and water. The fibers are useful for separating chemicals, e.g., aliphatically-unsaturated hydrocarbons, from mixtures containing them.
Claims12
A process for forming hollow, semi-permeable membrane fibers which comprises extruding a composition through an annular die at an elevated temperature to from said fibers, said composition consisting essentially of hydrophilic polymer and di(lower alkyl) sulfoxide solvent, said polymer consisting essentially of N-alkoxyalkyl polyamide and sufficient water-soluble polyvinyl alcohol to enhance the hydrophilic properties of the polyamide, said composition having a sufficient amount of water to inhibit degradation of the polymer at elevated temperature.
A process for forming hollow, semi-permeable membrane fibers which comprises extruding a composition through an annular die at an elevated temperature to form said fibers, said composition comprising polymer having about 30 to 85 weight percent of N-alkoxyalkyl polyamide and about 15 to 70 weight percent of water-soluble polyvinyl alcohol based on their total, about 70 to 400 weight percent of di(lower alkyl) sulfoxide based on the total weight of the polyamide and polyvinyl alcohol, and about 1 to 30 weight percent of water based on the total weight of the water and di(lower alkyl) sulfoxide.
Dependencies are inferred from the claim text.