Propylene Glycol from Renewable Sources (IMAGE) DOE/Pacific Northwest National Laboratory Caption Advances in hydrogen catalysts allow industrial chemists to turn renewable glycerol (aka glycerine) into a common additive called propylene glycol. Credit PNNL Usage Restrictions Credit PNNL License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.