Sintered composite medium and filter

Details Sintered composite medium and filter Sintered composite medium and filter

1986-05-02

1987-08-18

Nozick, Bernard

Liquid purification or separation

Plural distinct separators

Filters

55500, 55498, 55521, 55527, 55497, 55523, 428357, 428398, 210496, 21049701, 2104931, B01D 2924

Patent

active

046875794

ABSTRACT:
A particulate filter medium is formed of a sintered composite of 0.5 micron diameter quartz fibers and 2 micron diameter stainless steel fibers. A preferred composition is about 40 vol. % quartz and about 60 vol. % stainless steel fibers. The media is sintered at about 1100.degree. C. to bond the stainless steel fibers into a cage network which holds the quartz fibers. High filter efficiency and low flow resistance are provided by the smaller quartz fibers. High strength is provided by the stainless steel fibers. The resulting media has a high efficiency and low pressure drop similar to the standard HEPA media, with tensile strength at least four times greater, and a maximum operating temperature of about 550.degree. C. The invention also includes methods to form the composite media and a HEPA filter utilizing the composite media. The filter media can be used to filter particles in both liquids and gases.

REFERENCES:
patent: 2826265 (1958-03-01), DeWoody
patent: 4043775 (1977-08-01), Solomon
patent: 4114794 (1978-09-01), Storms
patent: 4122015 (1978-10-01), Oda et al.
Synthetic Fibers in Paper Making-Battista, O. A. Interscience-John Wiley, New York, 6/23/64, pp. 178, 186, 195.

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