Claims
- 1. A process for purifying water or other filterable liquid to remove at least 99.5% of sub-micron particles from said water or other filterable liquid comprising filtering the water or other filterable liquid through the wall of an extruded, thin-walled activated carbon filter tube which has been extruded from a composition comprising an essentially homogeneous admixture of;(a) from about 75% to about 85% by weight activated carbon particles, and (b) from about 15% to about 25% by weight of a thermoplastic binder powder having an average particle size of from about 5 μm to about 25 μm; wherein the activated carbon particles comprise;(a) from about 18% to about 50% by weight of activated carbon particles passing through a 325 mesh screen, and (b) from about 50% to about 82% by weight of activated carbon particles passing through a 200 mesh screen and retained on a 325 mesh screen.
- 2. The process of claim 1 comprising the purifying of water.
- 3. A process for purifying water or other filterable liquid to remove at least 99.5% of sub-micron particles from said water or other filterable liquid comprising filtering the water or other filterable liquid through the wall of an extruded, thin-walled activated carbon filter tube which has been extruded from a composition comprising an essentially homogeneous admixture of:(a) about 81% by weight activated carbon particles, and (b) about 19% by weight of a thermoplastic binder powder having an average particle size of from about 5 μm to about 25 μm; and wherein the activated carbon particles comprise about 28% by weight of activated carbon particles passing through a 325 mesh screen and about 72% by weight of activated carbon particles that pass through a 200 mesh screen but are retained on a 325 mesh screen.
- 4. The process of claim 3 comprising the purifying of water.
- 5. A process for purifying water or other filterable liquid to remove at least 99.5% of sub-micron particles from said water or other filterable liquid comprising filtering the water or other filterable liquid through the wall of a thin-walled activated carbon filter tube having a wall thickness of about 0.5 inch (12.7 mm) or less and an average dry density from about 0.65 to about 0.75 g/cm3 wherein the tube has been extruded from a composition comprising an essentially homogeneous admixture of:(a) about 81% by weight acid-washed, bituminous coal-based activated carbon particles, and (b) about 19% by weight of a thermoplastic binder powder having an average particle size of from about 5 μm to about 25 μm; wherein the activated carbon particles comprise:(a) about 28% by weight of activated carbon particles passing through a 325 mesh screen, and (b) about 72% by weight of activated carbon particles that pass through a 200 mesh screen but are retained on a 325 mesh screen.
- 6. The process of claim 5 comprising the purifying of water.
RELATED APPLICATION
This application is a divisional of application Ser. No. 08/902,571, filed Jul. 29, 1997, now U.S. Pat. No. 5,922,803, which is a continuation of application Ser. No. 08/607,294, filed Feb. 26, 1997, now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1083353 |
Sep 1967 |
GB |