Gas separation – Two or more separators – Plies or layers of different characteristics or orientation
Patent
1975-06-23
1976-10-19
Lutter, Frank W.
Gas separation
Two or more separators
Plies or layers of different characteristics or orientation
55 97, 55528, 55DIG5, 55DIG16, B01D 3916
Patent
active
039868516
ABSTRACT:
A filter element for aerosols and finely divided solid particles suspended in a gas, is formed by depositing a septum of microscopic and submicroscopic unsintered fibers of fibrillatable polytetrafluoroethylene (hereinafter referred to as PTFE) as a random network on a supporting screen. The filter so formed is especially effective to remove liquid and solid particles of micron and submicron size suspended in a gaseous medium to be filtered.
A process is described for separating contaminant solid and liquid particles less than about 5 .mu. (micron) in diameter from the gas in which the particles are suspended, comprising introducing primary particles of fibrillatable PTFE less than about 1 .mu. in diameter, into a flowing gas in which the contaminant particles are suspended, maintaining the gas at a temperature above the fibrillation temperature but below the sinter temperature of PTFE, for a time sufficient to form fibers of PTFE, depositing a random network of PTFE fibers upon a gas-permeable support means to form a septum of PTFE fibers sufficient to ensnare the contaminant particles, and recovering the gas substantially free of the contaminant particles. In another embodiment of the process, the filter element described is preformed. The gas in which the solid or liquid contaminant particles is suspended (hereinafter referred to as a dispersoid) is flowed through one or more filter elements and the purified gas substantially free of contaminant particles is removed.
REFERENCES:
patent: 2578523 (1951-12-01), Nuteley
patent: 2689199 (1954-09-01), Pesce
patent: 2893105 (1959-07-01), Lauterbach
patent: 2933154 (1960-04-01), Lauterbauch
patent: 3056247 (1962-10-01), Pindzola et al.
patent: 3353982 (1967-11-01), Blaha
patent: 3455792 (1969-07-01), Ohta
Lacey David L.
Lobo Alfred D.
Lutter Frank W.
The Harshaw Chemical Company
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