INVESTIGADORES
HEGEL Pablo Ezequiel
congresos y reuniones científicas
Título:
Phase transitions in the catalyst-free synthesis of monoglycerides using near critical alcohols
Autor/es:
N. COTABARREN; P. CANTERA; P. HEGEL; S. PEREDA
Lugar:
Córdoba
Reunión:
Congreso; XI Iberoamerican Conference on Phase Equilibria and Fluid Properties for Process Design; 2018
Resumen:
Mono/diglycerides (ACs) are oleochemical products derived from vegetable oils that are useful in different industries because of its emulsyfing properties. They are used in the elaboratorion of food products, in the cosmetic and cleaning industry, and for the elaboratorion of medicinal products because of its antiviral and antibacterial properties [1,2]. These products are conventionally obtained by glycerolysis of triglycerides (TG) under high reaction temperatures (230 °C) in the presence of an alkalyne catalyst. Special ACs can also be obtained from the direct glycerolysis of fatty acid esteres (FAE) with catalysts [3] or using supercritical alcohols [4]. Particularly, the catalyst-free reaction pathway from FAE seems highly promising regarding the production of special ACs due to the higher relative volatility that excibit FAE with respect toACs. Moreover, studies reported in the last years [4,5] show that emerging technologies, such as the supercritical CO2 extraction, can be used to fractionate FAE and purify ACs at mield temperatures (40 °C) and moderated pressures (110 bar), avoiding thermal degradation.To enhace mass transfer and obtain high reaction rates it is esential to operate the reactor under an homogeneous phase. FAE and glycerol (GL) excibit partial liquid miscibility even at very high temperatures, while FAE and short chain alcohols (methanol or ethanol) are miscible. Thus, the adition of alcohol promotes a homogeneous phase behavior[6,7]. In this work, we evaluate the phase behavior of the reactive system GL+FAE at at diffent temperatures and compositions using ethanol as co-solvent to asses feaseable operating conditions for the glycerolysis of fatty acid ethyl esters.