Method for improving filter efficiency
AssigneeE. I. Du Pont de Nemours and Company
InventorsSteven C. Brandon, Roy Segars, Jr.
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Abstract
The invention is directed to a method for improving the filtration efficiency of an altered substrate filter element comprising a porous solid substrate, one side of which is impregnated with sintered solid particles, by treating the solids-oxide-impregnated side with an aqueous suspension of small non-agglomerated solid particles which are deposited upon the sintered solid particles.
Claims9
A method for improving the filtration efficiency of any altered substrate filter element comprising a porous solid substrate having a pore size of 0.5-10 micrometers, the pores in one surface of which are impregnated to a depth of 30-100 micrometers with a sintered material having an average particle size of 5 to 500 nanometers, comprising treating the side of the filter element containing the sintered materials free of foulants, with a dilute suspension of non-agglomerated finely divided solid particles dispersed in an aqueous liquid medium, the size of the non-agglomerated particles being no greater than the size of the impregnated sintered solids, to effect separation of the finely divided solid particles from the aqueous liquid medium and deposition of the non-agglonerated, finely divided solid particles from the dilute suspension thereof on the sintered material particles in the pores of the porous solid substrate to a level of 1.08-54 g/m.sup.2.
Dependencies are inferred from the claim text.