Advanced Membrane Technology for Biosolvents

Total solvent usage in the U.S. is 3.8 million tons per year, and due to toxicity and environmental needs, a large fraction needs to be replaced. Ethyl lactate and its blends with soy methyl ester have excellent solvating properties and, when price and other market penetration issues are considered, approximately 25% of the solvent usage can be addressed by these biosolvents. This project will use pervaporation membrane separations technology to develop a ¿direct¿ process for the large scale commercial production of ethyl lactate. The process would be very economical and would not produce salt wastes. Phase I will establish the initial feasibility of the direct process through (1) development and testing of new pervaporation membrane materials with high ammonia affinity and fluxes, and (2) cracking and esterification with high boiling alcohols.