No abstract

No abstract

No abstract

No abstract

No abstract

Poly(viny1 alcohol) (PVA) was studied for use as a basic material for membrane preparation with the aim of dehydrating water-acetic acid mixtures. Membranes of different nature were made by blending a PVA sample of 96% hydroxyl content with a polyacid or a polybase counterpolymer in water, followed by complete evaporation. The PVA-polybase blends gave membranes of low selectivity, unsuitable for dehydration. The membrane M , , made of a 1 : 1 (by wt.) blend of PVA with a special grade of polyhydroxycarboxylic acid (PHCl), presents a good combination of selectivity and permeability. It was studied in a water-acetic acid mixture containing up to 10 wt.-W of water. The Arrhenius-type activation energy for the permeation was found to be 9,O kcal/mol (38 kJ/mol).

No abstract

No abstract