Colloid systems and wetting agents; subcombinations thereof; pro – Continuous or semicontinuous solid phase – The solid phase contains organic material
Patent
1996-09-04
1999-06-01
Lovering, Richard D.
Colloid systems and wetting agents; subcombinations thereof; pro
Continuous or semicontinuous solid phase
The solid phase contains organic material
516105, 516108, 516109, 588201, 588252, 588901, C09K 332
Patent
active
059083778
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND ARTS
The present invention relates to a method of solidifying liquid oils and a solidifying agent. More particularly, the present invention relates to the method of solidifying rapidly and easily waste oils such as used waste edible oils or waste engine oils of cars without heating and to the solidifying agent used therefore.
In recent years, water pollution of drains, rivers, lakes and the like has been a significant social problem from an environmental aspect and, among them, it is said that throwing away the used edible oils from general homes into drains is one of major causes for the pollution due to oils.
The used waste edible oils, if little, have been treated as inflammable trash after being absorbed into newspapers, cloths and the like. In case where an amount of the waste oils is large, however, since it is difficult to treat the waste oils by means of the absorption method, various kinds of methods of solidification-treatment of the waste oils with a gelling agent have been proposed in recent years. Though a certain method of those methods has already been commercialized (the following method (2)), it has not yet been spreaded sufficiently because problems such that it takes a long period of time to solidify the waste oils and that there is a danger of a fire caused by oil are not yet solved.
As the method of treatment by using the gelling agent, there are known a method (1) wherein a solidification-treating agent containing, as a main ingredient, a natural wax, a synthetic wax, a solid higher fatty acid, a solid higher alcohol or a resin having a melting point of not higher than 150.degree. C. is used for the solidification-treatment (JP-A-112385/1979), a method (2) wherein waste edible oils are solidified by adding 12-hydroxystearic acid to the waste edible oils, heating to dissolve the acid, and then cooling (JP-A-106298/1980), a method (3) wherein there is used a solidification-treating agent for disposal of waste edible oils containing a combination of 12-hydroxystearic acid and a small amount of a higher fatty acid having 16 to 24 carbon atoms or dibenzylidene sorbitol and a nuclear-substituted compound thereof as effective components (JP-A-19681/1986), a method (4) wherein waste edible oils are solidified by adding a solution of 12-hydroxystearic acid dissolved in a polar solvent such as dimethyl sulfoxide, N-methylpyrrolidone or ethyl alcohol to the waste edible oils and mixing them, and then bringing the obtained admixture into contact with water (JP-A-90599/1988), a method (5) wherein liquid oils are gelled by adding boric acid or a borate after the liquid oils are emulsified by adding a water-soluble macromolecular compound having hydroxyl group and water (JP-A-122796/1992), and the like.
Each of the above-mentioned methods (1) to (3) is, however, to solidify the waste oils by heating up to at least 80.degree. C. to dissolve the gelling agent therein and then cooling, and is neither economical nor efficient because a large energy and long time are required for heating and cooling the waste oils. Further, these methods have many problems such that there is a danger of getting scalded if the heated waste oils of high temperature are spilled, that there is a fear of a fire to be caused by heating the waste oils too high, and that bad smell due to deterioration of the waste oils are generated during the heating. Particularly, in case where the amount of oil is about four liters like waste engine oil from a car and is several times larger than that of the waste edible oil generated in the general home, a danger of scalding and fire is further increased. Therefore, it cannot be recommended in view of safety to carry out the solidification-treatment of the waste engine oils (hereinafter abbreviated simply to "waste-oil-treatment") at general homes according to methods (1) to (3). The method (4) is different from methods (1) to (3) and is recognized to be advantageous in that the treatment of the waste oils can be carried out without heating. There is a problem, however, in safety
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Lovering Richard D.
Metzmaier Daniel S.
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