Stabilized solvents and method for cleaning metallic, electrical and plastic substrates utilizing environmentally safe solvent materials
AssigneeAdvanced Chemical Design, Inc.
InventorRichard G. Henry
Life of this patent
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Abstract
A stabilized, environmentally-safe solvent mixture and method for using the mixture are provided. The solvent mixture has an ozone depletion factor of less than 0.08. The mixture includes about 80-96.8%, by volume, chlorobromomethane and about 3.2-20.0%, by volume, of a mixture of stabilizers. The mixture of stabilizers includes nitromethane, 1,2-butylene oxide, and 1,3-dioxolane. The mixture of stabilizer inhibits the decomposition of chlorobromomethane. The solvent mixture is particularly effective for cleaning articles having hydrocarbon-soluble contaminants, especially in a vapor degreaser.
Claims20
A solvent mixture having an ozone depletion factor of less than 0.08, for use in a vapor degreasing system, consisting essentially of:
- about 80-96.8% by volume, chlorobromomethane;
- about 3.2-20.0%, by volume, of a mixture of stabilizers consisting essentially of:
- (1) nitromethane;
- (2) 1,2-butylene oxide, and
- (3) 1,3-dioxolane,
- the mixture of stabilizers being effective to inhibit the release of bromine into the atmosphere from the chlorobromomethane.
A solvent mixture having an ozone depletion factor of less than 0.08 comprising about 80-96.8%, by volume, chlorobromomethane and about 3.2-20%, by volume, of a mixture of stabilizers consisting essentially of:
- nitromethane;
- 1,2-butylene oxide;
- and,
- 1,3-dioxolane.
A solvent mixture having an ozone depletion factor of less than 0.08, for use in a vapor degreasing system, consisting essentially of:
- about 95% by volume, chlorobromomethane;
- and
- about 5%, by volume, of a mixture of stabilizers consisting essentially of, approximately by volume of the solvent mixture,
- about 0.5% nitromethane;
- about 0.5% 1,2-butylene oxide;
- and
- about 4.0% 1,3-dioxolane;
- the mixtures of stabilizers being operated to inhibit the release of bromine into the atmosphere from the chlorobromomethane.
A method for vapor cleaning articles comprising the steps of:
- providing a solvent mixture having an ozone depletion factor of less than 0.08 comprising about 80-96.8%, by volume, chlorobromomethane and about 3.2-20%, by volume, of a mixture of stabilizers consisting essentially of nitromethane, 1,2-butylene oxide, and 1,3-dioxolane;
- heating the solvent mixture to its boiling point to produce a vapor layer above the solvent;
- placing an article containing contaminants into the vapor layer;
- condensing the solvent mixture onto the article;
- dissolving said contaminants in said solvent mixture;
- removing said solvent mixture containing said contaminants;
- and
- removing the article from the vapor layer.
Dependencies are inferred from the claim text.