Membrane process for separation of organic liquids.

摘要

A charge composition containing (i) an alcohol having less than three carbon atoms and (ii) an oxygenate selected from organic ethers, aldehydes, ketones, and esters is passed into contact with a first side of a non-porous membrane separating layer comprising a blend of a polyvinyl alcohol and a polyacrylic acid on a polyacrylonitrile support layer; with a pressure drop across the non-porous separating layer from the first (high pressure) side to a second (low pressure) side. At least a portion of alcohol from the charge composition and a lesser portion of oxygenate pass by pervaporation through the non-porous separating layer as a lean mixture containing more alcohol and less oxygenate than are present in said charge composition, leaving a rich liquid containing less alcohol and more oxygenate than are present in said charge composition; the lean mixture, in vapor phase at a pressure its vapor pressure being recovered as permeate from the low pressure side of the non-porous separating layer.