Quaternary ammonium compounds useful for inhibiting metal corrosion
US5756004A · kind A · utility
20Cited by
7References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 13, 1997 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | May 13, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/939
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides improved quaternary ammonium compounds useful as metal corrosion inhibitors in aqueous acid solutions, methods of preparing the compounds, metal corrosion inhibited aqueous acid solutions containing the compounds and methods of protecting metal surfaces from acid corrosion using the compounds. The compounds are prepared by contacting the still bottoms residue produced in the distillation of quinoline from coal tar with oxygen to oligomerize aromatic amines contained therein and then reacting the oligomerized amines with a benzylhalide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.