Membranes obtained by blending poly(vinyl alcohol) (PVOH) and poly(acrylic acid) (PAA) have been investigated for the separation of methanol and methyl-t-butyl ether( MTBE) liquid mixturest through a pervaporation process. Experiments were performed by contacting one side of a polymer dense film with the liquid mixture and removing the vapor on the other side with an inert gas flux, a setup for a process with sweeping gas. The blend membranes with a COOH/OH ratio in the 0.5-2.5 range,are permeated by methanol preferentially. Higher values of flux and lower values of selectivity are observed when the methanol content in the feed increases. The ratio PAA/PVOH of the membrane influences both flux and selectivity in the same way. A maximum of both flux and selectivity is observed at a COOH/OH ratio of about 2.The swelling of membrane of different composition in the presence of different liquid compositions explains the flux behavior in the pervaporation experiments. The observed membrane swelling has been explained on the basis of the solubility parameters of the components of the system
Pervaporation of methanol/methyl-t-butyl ether mixtures through poly(vinyl alcohol)/poly(acrylic acid) blend membranes / GOZZELINO G.. - In: SEPARATION SCIENCE AND TECHNOLOGY. - ISSN 0149-6395. - STAMPA. - 40(2005), pp. 2265-2276.
|Titolo:||Pervaporation of methanol/methyl-t-butyl ether mixtures through poly(vinyl alcohol)/poly(acrylic acid) blend membranes|
|Data di pubblicazione:||2005|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1080/01496390500201425|
|Appare nelle tipologie:||1.1 Articolo in rivista|