Process for drying water-wet membranes

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

1982-05-17

1984-02-14

Camby, John J.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

55 16, 34 15, F26B 300, F26B 504, B01D 5910

Patent

active

044308078

ABSTRACT:
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 C.sub.1 to C.sub.6 hydrocarbon 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.

REFERENCES:
patent: 3415038 (1968-12-01), Merten et al.
patent: 3534528 (1970-10-01), Porter
patent: 3842515 (1974-10-01), MacDonald et al.
patent: 4068387 (1978-01-01), Manos
patent: 4080743 (1978-03-01), Manos
patent: 4080744 (1978-03-01), Manos
patent: 4120098 (1978-10-01), Manos
patent: 4130403 (1978-12-01), Cooley et al.
Vos et al., I & EC Prod. Res. & Dev., vol. 8, No. 1, pp. 84-89, (1969).
Gantzel et al., Ind. Eng. Chem. Proc. Des. Dev., vol. 9, No. 2, pp. 331-332, (1970).
Matsui et al., "Gas Permeation Properties of Cellulose Triacetate Hollow Fiber Membrane", Symposium, (1980).

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