# US 2010/0163789 A1 · Calcium carbonate scale inhibitor and remover for freshwater and seawater flushed sanitary waste systems

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2010/0163789 A1
- Document ID: US20100163789A1
- Status: Published application
- Kind: A1
- Application number: 12/647,651
- Filed: 2009-12-28
- Published: 2010-07-01
- Earliest claimed: 2008-12-30
- Inventors: Thomas F. D'Muhala
- Web page: https://patentgrep.com/patent/US20100163789A1

## CPC

- C02F 5/12: containing nitrogen (C02F5/14 takes precedence)
- C02F 2103/008: {Originating from marine vessels, ships and boats, e.g. bilge water or ballast water}
- C02F 2303/08: Corrosion inhibition
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)

## Abstract

A powder formulation containing biodegradable organic compounds which will not bioaccumulate or pollute, allow for the safe and effective room temperature elimination of scale from freshwater and seawater flushed toilets and sanitary waste systems. The formulation mixes readily with water and removes only scales and deposits, not the underlying materials of construction. The formulation is non-toxic, non-caustic, non-flammable, and contains no mineral acids.

## Claims

### Claim 1

A mineral acid free powder formula for inhibiting and removing calcium carbonate scale from freshwater and seawater flushed sanitary systems used on ships and boats, and in land based facilities, including hotels, resorts, and commercial, office, and industrial buildings, comprising:
2-hydroxy-1,2,3,-propanetricarboxylic acid, monohydrate;
2-hydroxy-1,2,3, propanetricarboxylic acid, trisodium salt, dihydrate;
Glycine, N′N′-1,2-ethanediylbis[N-(carboxymethyl)-tetrasodium salt, dihydrate;
one or more corrosion inhibitors; and
optionally, one or more dyes.

### Claim 2 (depends on 1)

The mineral acid free powder formula of claim 1 wherein said one or more corrosion inhibitors are selected from the group consisting of 1, 2,3-benzotriazole; a blend of acetylenic alcohols, salts of quaternary amines, and nonionic surfactants; and a blend of substituted triazine (40-50%), ethylene glycol (1-10%), hydrochloric acid (1-10%), thiourea (1-5%), and water.

### Claim 3

A mineral acid free powder formula for inhibiting and removing calcium carbonate scale from freshwater and seawater flushed sanitary systems used on ships and boats, and in land based facilities, including hotels, resorts, and commercial, office, and industrial buildings, comprising:
a blend of organic acids and organic acid salts;
one or more corrosion inhibitors; and
optionally, one or more dyes.

### Claim 4 (depends on 3)

The mineral acid free powder formula of claim 3 wherein said blend of organic acids and organic acid salts includes one or more organic acids or organic acids salts selected from the group consisting of:
2-hydroxy-1,2,3,-propanetricarboxylic acid, monohydrate;
2-hydroxy-1,2,3, propanetricarboxylic acid, trisodium salt, dihydrate;
Glycine, N′N′-1,2-ethanediylbis[N-(carboxymethyl)-tetrasodium salt, dihydrate;
Glycolic acid;
Sulfamic acid;
Ethylenediaminetetraacetic acid;
Nitrilotriacetic acid;
Potassium or sodium salts of glycolic acid;
Glycine, N,N′-1,2-ehtanediylbis[N-(carboxymethyl)-disodium salt;
Glycine, N,N′-1,2-ehtanediylbis[N-(carboxymethyl)-tetrapotassium salt;
Glycine, N,N′-1,2-ehtanediylbis[N-(carboxymethyl)-dipotassium salt;
Potassium or sodium salts of Nitrilotriacetic acid; and
2-Hydroxy-1,2,3-propanetricarboxylic acid, tripotassium salt.

### Claim 5 (depends on 3)

The mineral acid free powder formula of claim 3 wherein said one or more corrosion inhibitors are selected from the group consisting of:
a blend of acetylenic alcohols, salts of quaternary amines, and nonionic surfactants;
a blend of substituted triazine (40-50%), ethylene glycol (1-10%), hydrochloric acid (1-10%), thiourea (1-5%), and water;
1,2,3-Benzotriazole;
a blend of alkoxylated fatty amine (proprietary %), alkoxylated organic acid (proprietary %), and thiourea, N,N′-dibutyl (20-30%);
a blend of ethylene dihydroiodide (1-10%), iodine complex (1-10%), phosphoric acid (1-10%), surfactants (1-10%), and water;
tolyltriazole, sodium salt; and
an acetylenic alcohol-based inhibitor.