Phosphinate inhibitor for scale squeeze applications
US5018577A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1990 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Aug 2, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/927
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A squeeze treatment for preventing scale utilizes as the scale inhibitor a predominantly phosphinate containing composition comprising: ______________________________________ Mole Percent - Ingredients Less Than ______________________________________ A. Monosodium phosphinicobis - 22 (succinic acid) B. Monosodium phosphinico- 26 succinic acid C. Sodium phosphonosuccinic acid 12 D. Sodium phosphate 5 E. Sodium phosphite 6 F. Sodium hypophosphite, and 6 G. A phosphinicosuccinic acid oligomer having the probable structural formula: ##STR1## ______________________________________ wherein G exceeds 25 mole percent, M is H, Na, K, NH.sub.4, amine salts and mixtures thereof and m and n are either 0 or a small whole number with the proviso that either m or n is a small whole number and the sum of m plus n is greater than 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.