Draw solute separation from a draw solution is the main source of energy consumption in forward osmosis. The draw solute separation efficiency from a TMA-CO2-H2O (TMA = trimethylamine) draw solution and the decomposition kinetics of the latter were investigated in this study from 30 to 50 degrees C and 0.75 to 0.35 bar. The former proved stoichiometric and efficient with similar to 100% draw solute removal after 60 min at 50 degrees C and 0.35 bar. The rate-determining step proved to be the physicochemical phenomenon of the desorption of the less volatile gas, TMA. It was found to be first order with respect to the TMA(aq) concentration. The combined effects of temperature and pressure on the k values proved that only the temperature has a significant effect. Finally, an Eyring-Arrhenius model was designed to estimate k values for the TMA desorption rate in the temperature and pressure range studied in this work.