Abstract
This is a report on the use of (kraft and soda) lignins as polymeric amphiphiles for the stabilization of emulsions. The lignins' phase behavior in oil/water systems is presented and explained in terms of their molecular affinities. Emulsions with various oils (including crude oils) were formulated and their properties were rationalized in terms of lignin surface activity as a function of pH and salinity. It is concluded that lignins are an effective emulsion stabilizer; the resulting emulsions behave according to the balance of affinities between oil and water phases and lignin-based emulsions can be tailored to meet specific demands.