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US 4,069,157 AGranted
Ultrafiltration device
AssigneeE. I. Du Pont de Nemours and Company
InventorsFred Wayne Hoover, Robert Earl Roberts
Life of this patent
Estimating the term…
Abstract
A ceramic support having a multiplicity of parallel passageways therethrough, the passageways being coated with an ultrafiltration membrane, the support having a specific surface area to volume ratio and defined permeability characteristics.
Claims8
An ultrafiltration device comprising an integral support of porous ceramic material having substantially uniformly spaced and axially parallel passageways formed therein and a permselective membrane coated onto the surface of the passageways wherein:
- a. the surface area (SA) of the passageways in the porous support is about from 300 to 2,000 square meters per cubic meter of support;
- b. the pores in the support have diameters of about from 2 to 20 microns and the decimal proportion of the volume of the pores of the element material to the total volume occupied by the material (PV) is about from 0.30 to 0.60;
- c. the decimal proportion of the volume of the support material exclusive of the passageways to the total volume of the support (SV) is about from 0.40 to 0.75;
- and
- d. the permeability factor (PF) of the support, defined as PF = PV .times. SV/SA, is greater than about 1.0 .times. 10-4 meter.
2 more elements
Dependencies are inferred from the claim text.