Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs – Clay
Patent
1983-01-20
1984-07-10
Gantz, Delbert E.
Catalyst, solid sorbent, or support therefor: product or process
Zeolite or clay, including gallium analogs
Clay
119 1, 501141, B01J 2012
Patent
active
044593686
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to sorbing and deodorizing compositions, and particularly to particulate mixtures of particulate synthetic and clay particle sorbents.
BACKGROUND ART
Pulverized, particulate clays, known in the art as fuller's earth or fuller's earth clays, are well-known for their oil and water sorbing properties and for their deodorizing characteristics. As a result, these clays have various industrial and household uses such as for the sorption of oil, grease and the like from floors and elsewhere where such materials represent a safety hazard. In addition, because of their water sorbing and deodorizing characteristics, fuller's earths have been found particularly useful in animal toilet applications, e.g., as a cat box sorbent. Another advantage of fuller's earth clays is their relatively low bulk densities of about 0.4 to about 0.9 kilograms per liter (kg/l) allows the use of relatively light weight sorbents.
Although fuller's earths have excellent sorbing and deodorizing characteristics, their use suffers from several cost-related difficulties. For example, fuller's earth clay deposits in sufficient quantities for commercialization occur only in six locations, five of which are in the United States, with the sixth being in Spain. Thus, large shipping expenses are encountered when world-wide product distribution is sought. Shipping expenses also present a problem within the United States because most of the commercialized deposits occur from southern Illinois through northern Florida, with one deposit in southern California and another in central Texas. Thus, relatively long range shipments are required to distribute the clays even within the United States.
Several methods have been tried to minimize the expense concomitant with the use of fuller's earths by preparing synthetic sorbing and deodorizing compositions from materials which are more readily available. Compositions based upon hydrated commercial grade plaster, calcium sulfate dihydrate, and their methods of manufacture, which are useful replacements for fuller's earth clays as particulate sorbents are exemplified by the teachings of commonly owned U.S. Pat. Nos. 4,163,674, 4,183,763 and 4,264,543. However, while the synthetic sorbtive granules can replace fuller's earth clays as sorbents for oil, water, excreted body fluids and like liquids, it has been found that the effectiveness of synthetic sorptive granules can be further enhanced by admixtures of such synthetic sorptive granules with particulate clay.
SUMMARY OF THE INVENTION
The present invention relates to a particulate, water and oil sorbing composition which contains a substantially uniform mixture of sorbent fuller's earth clay particles and synthetic sorbent particles, e.g. calcium sulfate dihydrate-containing granules; the clay particles being present relative to the synthetic particles at a weight ratio of about 1:9 to about 3:7. The clay particles useful herein have a bulk density of about 0.4 to about 0.9 kg/l and sorb water or oil in an amount more than about 50 percent of their own weight. In addition, the particle size distribution of the clay particles is such that no more than about 60 weight percent of the particles will be retained on a 6 mesh sieve screen. The synthetic particles have a bulk density of about 0.5 to about 0.9 kg/l, sorb water or oil in an amount of more than 30 percent of their own weight, and have a size distribution such that no more than about 20 weight percent are retained on a 6 mesh sieve screen.
The sorbent compositions of the present invention exhibit effective odor abatement properties when used as animal litter and are mixtures wherein the ratio of the weight of clay particles to the weight of synthetic particles is important in order to maximize the water sorbing effect. These compositions are not mere aggregations of previously known materials in which any ratio of ingredients will suffice. The synergistic water sorbing effect of compositions of this invention is shown dramatically by the data plotted in the gra
REFERENCES:
patent: 4264543 (1981-04-01), Valenta
Gershon Norman B.
Jaffee Richard M.
Gantz Delbert E.
McFarlane A.
Oil-Dri Corporation of America
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