Bio Propylene Glycol is an alternative to petrochemistry for producing propylene glycol from glycerin. Unlike the conventional method, this technology does not rely on petroleum.
The feedstock for Bio Propylene Glycol is pharmaceutical grade glycerin, which is hydrogenated in liquid phase with a copper catalyst. Two serial fixed-bed reactors are used to house the reaction, which occurs at a temperature of 175 to 195° Celsius and at a pressure of 75 to 200 bar. The crude product is then sent to a two-column distillation unit to be purified. This generates pharmaceutical grade propylene glycol (1,2-propanediol, Monopropylene Glycol).
Alternative technology for producing propylene glycol