Ultraporous and microporous integral membranes

Details Ultraporous and microporous integral membranes Ultraporous and microporous integral membranes

1992-02-21

1993-02-23

Dawson, Robert A.

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

21050027, 21050041, B01D 2900

Patent

active

051887347

ABSTRACT:
Ultraporous and microporous polymer membranes cast from metastable dispersions are significantly improved by limiting the time of environmental exposure to less than about 0.5, preferably less than 0.25 seconds, between casting and quenching, and reducing the casting temperatures about 10.degree. to about 20.degree. C. lower than the usual prior art values. The resulting membranes have far less debris entrained in the membrane, far more consistent and uniform pore sizes, a substantially greater number of skin pores, and greatly increased flow rates for any given pore diameter. The membranes are highly asymmetrical and skinned with a standard deviation in flow rate of less than about 400 and a flow rate covariance of less than about 6, with skin pore diameters of from about 0.001 .mu..

REFERENCES:
patent: 3158532 (1964-11-01), Pall et al.
patent: 3615024 (1971-10-01), Michaels
patent: 3883626 (1975-05-01), Kamide et al.
patent: 3907774 (1973-01-01), Kimura
patent: 3988245 (1976-10-01), Wang
patent: 4177150 (1979-12-01), Inoue et al.
patent: 4220543 (1980-09-01), Yamasita
patent: 4229291 (1980-10-01), Walch et al.
patent: 4247498 (1981-01-01), Castro
patent: 4629563 (1986-12-01), Wrasidlo
patent: 4774039 (1988-09-01), Wrasidlo
patent: 4814082 (1989-03-01), Wrasidlo
Galen W. Ewing, "Instrumental Methods of Chemical Analysis," Third Edition pp. 58-62.

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