Claims
- 1. A composition comprising a thixotropic slurry of powdered activated carbon and an effective polysaccharide or modified polysaccharide suspending agent, said powdered activated carbon being prepared by the destructive distillation of a wood precursor, said slurry having a viscosity of about 200-4,000 cps Brookfield RVT.
- 2. A stable slurry composition comprising powdered activated carbon prepared by the destructive distillation of a wood precursor and an effective polysaccharide suspending agent selected from the group consisting of dextran polymer, sodium carboxymethyl cellulose, and hydroxyethyl cellulose; wherein said slurry maintains its thixotropic properties while exhibiting only slight stratification without liquid separation or hard pack sludging following six weeks storage at ambient temperature; said slurry further having a viscosity of about 200-4,000 cps Brookfield RVT.
- 3. A composition as recited in claim 2 wherein said polysaccharide suspending agent comprises sodium carboxymethyl cellulose.
- 4. A composition as recited in claim 3 wherein based on the total weight of said slurry, said powdered activated carbon is present in an amount of from about 1 wt. % to about 50 wt. %; said sodium carboxymethyl cellulose being present in an amount of about 0.025 wt. % to about 5 wt. %.
- 5. A composition as recited in claim 4 wherein said powdered activated carbon is present in said slurry in an amount of about 30 wt. %, and said sodium carboxymethyl cellulose being present in an amount of about 0.5 wt. %.
- 6. A stable slurry composition comprising about 30 wt. % of the total weight of said slurry powdered activated carbon derived by the destructive distillation of a wood precursor and about 0.5 wt. % of the total weight of said slurry sodium carboxymethyl cellulose haivng a viscosity of about 200-4,000 cps Brookfield RVT said slurry maintaining its thixotropic properties while exhibiting only light stratification without liquid separation or hard pack sludging following six weeks storage at ambient temperature.
CROSS REFERENCE TO RELATED APPLICATIONS
This is a division of application Ser. No. 890,687 filed on July 25, 1986, now U.S. Pat. No. 4,729,795, which is a continuation-in-part of application Ser. No. 761,641, filed Aug. 1, 1985, now abandoned.
US Referenced Citations (13)
Foreign Referenced Citations (1)
Number |
Date |
Country |
53-20656 |
Feb 1978 |
JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
890687 |
Jul 1986 |
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Continuation in Parts (1)
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Number |
Date |
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Parent |
761641 |
Aug 1985 |
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