Industrial & Engineering Chemistry Research, Vol.59, No.29, 13007-13015, 2020
Continuous Process for the Production of Taurine from Monoethanolamine
Taurine, 2-aminoethane-1-sulfonic acid, is a commercial amino acid manufactured from either ethylene oxide or monoethanolamine (MEA). Taurine is a valuable nutritional additive that is widely used in the production of energy drinks, pet food, nutritional supplements, and infant formula. The industrial production of taurine from MEA is a two-step batch process in which the first step is the reaction of MEA with sulfuric acid to produce the ester 2-aminoethyl hydrogen sulfate (AES) and the second step is the reaction of AES with a sulfite reagent. This report summarizes the results of a study of the fundamental chemistry for this two-step MEA-based chemical route to taurine as well as the application of this fundamental understanding to a process design for a scalable and cost-advantaged continuous process that is capable of commercial-scale production of taurine on a multikiloton scale. In order to maximize taurine yields, the water formed during the first esterification step must be effectively removed to avoid equilibrium limitations on the conversions of MEA and sulfuric acid to form the solid AES intermediate product. For the second AES sulfonation step in aqueous medium, we found that operation above 100 degrees C under a moderate pressure of an inert gas resulted in significantly higher taurine yields (>80 mol %) compared to those reported in current commercial production technology (typically 55-65 mol %).