Progress of Cryogenics and Isotopes Separation


The National Conference with international participation on New Cryogenic and Isotope Technologies for Energy and Environment - EnergEn 2018 is organized by the National Research-Development Institute for Cryogenic and Isotopic Technologies - ICSI Rm. Valcea with the scientific participation of the University of Pitesti and the University of Craiova and will be held at Baile Govora, in 2018.





Adriana Marinoiu1*, Elena Carcadea1, Claudia Cobzaru2, Catalin Capris1, Vasile Tanislav1, Mircea Raceanu1, Ioan Iordache1


1National Institute for Research and Development for Cryogenics and Isotopic Technologies - ICIT Rm. Valcea, Uzinei Street no. 4, P.O. Box Raureni 7, 240050, Ramnicu Valcea, Romania





The planned massive increase in the production of bio-diesel will inevitably lead to a large oversupply of glycerol. From each unit of vegetable oil that is converted to bio-diesel approximately 10% by weight will be recovered as by-product glycerol. Conventionally, the commercial propylene glycol production route is propylene-based, through propylene oxide, and therefore it is sensitive to the price of petroleum and associated products. There is clearly an attraction to de-coupling propylene glycol from petroleum and exploiting the predicted surplus of glycerol is one way of achieving this. The efficient catalytic conversion of glycerol, the main by-product from the bio-diesel production, into valuable chemicals, can contribute to the promotion of bio-diesel utilization from both an economic and environmental point of view. Glycerol can be hydrogenated to propylene glycol using copper chromite catalyst with high yield and conversion under mild reaction conditions (20 bar, 200°C, 8 h) and basic aqueous solutions. The effect of the added base type was discussed in this paper. The highest conversion of glycerol and the highest selectivity to 1,2-propanediol were observed in presence of LiOH.


Keywords: hydrogenolysis, propylene glycol, copper chromite catalyst.