Method of removing iron sulfide and sludge from metal surfaces
US4011097A · kind A · utility
Inventor
Key dates
| Filing date | Dec 22, 1975 |
| Grant date | Mar 8, 1977 |
| Priority date | — |
| Expiry date | Dec 22, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D1/72
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A water-soluble composition capable of removing iron sulfide and sludge from metal surfaces and a method of such removal of iron sulfide and sludge from metal surfaces, particularly in a glycol system, the composition comprising: PA1 A. from about 2 to about 15% by weight of a high molecular weight linear diamine; PA1 B. from about 2.5 to about 18% by weight of acetic acid; PA1 C. from about 1 to about 10% by weight of an organic nitrogen substituted imidazoline; PA1 D. from about 6 to about 15% by weight of a non-ionic surfactant; PA1 E. from about 2 to about 8% by weight of a quaternary ammonium chloride; PA1 F. from about 1 to about 15% by weight of an alcohol solvent; and PA1 G. the remainder, water. In the method of removing iron sulfide and sludge from interior metal surfaces, particularly in a glycol system, the above composition is added to the effluent of the glycol system for onstream treatment in an amount effective to remove the iron sulfide and sludge. Generally, the composition is added to the effluent in an amount of from about 200 to about 1,000 parts per million of effluent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.