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US 5,665,694 AGranted
Block detergent containing nitrilotriacetic acid
AssigneeMonsanto Company
InventorsThomas Whitner Backes, Sean Douglas Dingman, Sheldon Philip Verrett
Life of this patent
Estimating the term…
Abstract
A solid, block detergent containing an alkali metal salt of nitrilotriacetic acid, an acid, alkali metal containing hydroxides and silicates, and alkali metal containing carbonates and sulfates is taught. A process for producing the block detergent is also taught.
Claims34
A solid, block detergent comprising:
- a. from about 25% to about 60% by weight of the formulation of an alkali metal salt of nitrilotriacetic acid;
- b. from about 0.1% to about 10% by weight of the formulation of acid;
- c. from about 5% to about 40% by weight of the formulation of a first alkali metal containing compound selected from the group consisting of alkali metal hydroxides, alkali metal silicates and mixtures of alkali metal hydroxides and silicates, wherein when the alkali metal containing compound is an alkali metal hydroxide or a mixture containing an alkali metal hydroxide, the alkali metal containing compound must include from about 0.1% to about 20% by weight of the formulation potassium hydroxide;
- and
- d. from about 5% to about 25% by weight of the formulation of a second alkali metal containing compound selected from the group consisting of alkali metal carbonates, alkali metal sulfates and mixtures of alkali metal carbonates and alkali metal sulfates.
2 more elements
A process for producing a solid, block detergent comprising the steps of:
- a. preparing an aqueous alkaline solution containing from about 5% to about 40% by weight of the formulation of a first alkali metal containing compound selected from the group consisting of alkali metal hydroxides, alkali metal silicates and mixtures of alkali metal hydroxides and silicates, wherein, when the aqueous alkaline solution contains alkali metal hydroxides, the alkali metal hydroxides must include sufficient potassium hydroxide to constitute from about 0.1% to about 20% by weight of the formulation;
- b. mixing from about 25% to about 60% by weight of the formulation of an alkali metal salt of nitrilotriacetic acid into the aqueous alkaline solution to form a slurry;
- c. adding from about 0.1% to about 10% by weight of the formulation of an acid to the slurry;
- d. mixing from about 5% to about 25% by weight of the formulation of a second alkali metal containing compound selected from the group consisting of alkali metal sulfates, alkali metal carbonates and mixtures of alkali metal sulfates and alkali metal carbonates into the slurry;
- and
- e. curing the slurry.
3 more elements
A process for producing a solid, block detergent comprising the steps of:
- a. preparing an aqueous alkaline solution containing from about 5% to about 40% by weight of the formulation of a first alkali metal containing compound selected from the group consisting of alkali metal hydroxides, alkali metal silicates and mixtures of alkali metal hydroxides and silicates, wherein, when the aqueous alkaline solution contains alkali metal hydroxides, the alkali metal hydroxides must include sufficient potassium hydroxide to constitute from about 0.1% to about 20% by weight of the formulation;
- b. mixing from about 25% to about 60% by weight of the formulation of a granular, acid treated alkali metal salt of nitrilotriacetic acid into the aqueous alkaline solution to form a slurry;
- c. mixing from about 5% to about 25% by weight of the formulation of a second alkali metal containing compound selected from the group consisting of alkali metal sulfates, alkali metal carbonates and mixtures of alkali metal sulfates and alkali metal carbonates into the slurry;
- and
- d. curing the slurry.
2 more elements
Dependencies are inferred from the claim text.