Process for production of porous glass membrane tubes

Details Process for production of porous glass membrane tubes Process for production of porous glass membrane tubes

1975-11-13

1977-08-16

Kellogg, Arthur D.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 31, 427309, C03B 3702, C03C 2500

Patent

active

040423590

ABSTRACT:
The invention relates to a process for producing a tubular glass membrane with wall thicknesses between 5 and 30 microns and reproducible pore sizes between 11 A and 50 A. Alkali borosilicate glass is drawn into discrete hollow tubes and immediately cooled. The tubes are thermally treated to effect a phase separation into a coherent silicon dioxide phase and a boron oxide phase rich in alkali borate. The boron oxide phase is leached out with mineral acid. The tubes can be subsequently treated to give enlarged or reduced pores, asymmetric pores and coated surfaces.

REFERENCES:
patent: RE26760 (1970-01-01), Mahoney
patent: 2336227 (1943-12-01), Dalton
patent: 3157534 (1964-11-01), Domicone et al.
patent: 3268313 (1966-08-01), Burgman et al.

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