Process for drying water-wet membranes

Details Process for drying water-wet membranes Process for drying water-wet membranes

Category

C - Chemistry, Metallurgy

Subcategory

08

Subsubcategory

J

CPC

18/25

IPC codes

C08J 9/28 (2006.01) F26B 5/00 (2006.01) F26B 7/00 (2006.01)

Type

Patent

Patent number

CA 1225505

Description

ABSTRACT OF THE DISCLOSURE An improved process for drying water-wet, cellulose ester membranes is described. It has been found that by contacting one side of the membrane with a liquid mixture of a water-miscible, volatile C1 to C6 hydro- carbon and a water-immiscible organic compound, while an inert gas stream or vacuum is maintained on the other surface of the membrane, water can be displaced from the membrane economically, rapidly and without adversely affecting the structure of the membrane. A 1 to 1 volume mixture of isopropanol and isooctane is particularly preferred in this step. The essentially water-free membrane is then dried by applying reduced pressure or an inert gas stream to produce a membrane having exceptional separation characteristics. 30,333-F

Application Number

427933

Affiliated with

Also associated with

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