A method of making surfactants from lignin is disclosed by reducing lignin
in the presence of a metal oxide or iron based catalyst in an organic
hydrogen donor solvent to produce lignin phenol and subjecting the lignin
phenol 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.