Propylene glycol process
In the DAVYTM propylene glycol process, glycerine is reacted over a heterogeneous catalyst with hydrogen at moderate conditions. Fresh glycerine together with a recycle stream is vaporised in a recirculating stream of hydrogen, with a suitable quantity of make-up hydrogen, typically from a pressure swing adsorption unit. Per-pass glycerine conversion is around 99% and byproducts are removed by distillation.
Our DAVY glycerol to propylene glycol (GPG) process is a perfect fit for our DAVY biodiesel process as the by-product, glycerol, can be fed to an adjoining GPG plant.