Particulate membrane ultrafiltration device
AssigneeE. I. Du Pont de Nemours and Company
InventorsFred Wayne Hoover, Ralph K. Iler
Life of this patent
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Abstract
An ultrafiltration device which includes a porous support, one surface of which is coated with a membrane comprising at least two sizes of particles, one size being capable of passing through the pores and another size capable of passing into but not through the pores.
Claims8
In an ultrafiltration device of the type comprising an integral porous support having pores about from 0.5 to 45 microns in their smallest cross sectional dimension and a removable and renewable particulate membrane inert to feedstock coated onto at least a portion of the surface of the support, the improvement wherein the membrane comprises
- a. large inorganic particles about from 0.5 to 45 microns in average cross sectional dimension and of such size as will enter but not pass through the pores of the support and
- b. small inorganic particles about from 0.002 to 0.5 microns in average cross sectional dimension and of such size as will pass through the pores of the support, said particles being bonded together with silica particles formed by heating the membrane with an alkaline solution of silica at about 90.degree.-100.degree. C.
Dependencies are inferred from the claim text.