Recovering hydrocarbons with surfactants from lignin
US4787454A · kind A · utility
16Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1987 |
| Grant date | Nov 29, 1988 |
| Priority date | — |
| Expiry date | Oct 23, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/936
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of producing surfactants from lignin is disclosed by reducing lignin in the presence of a carbon monoxide or hydrogen reducing agent at high temperature and pressure to produce low molecular weight lignin phenols and subjecting the lignin phenols to one or a combination of several reactions such as alkoxylation, alkylation, sulfonation, sulfation, alkoxysulfation, and sulfomethylation. The lignin surfactants so produced can be employed in a surfactant system to recover oil from underground formations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.