Glycerin is created as a by-product in the production of biodiesel. Biodiesel is usually produced from rapeseed oil, but this can also be sunflower or soybean oil. In this case, it was produced with used vegetable oil; Used Cooking Oil. The crude oil is refined and then it is processed by means of esterification converted into biodiesel and glycerin. The latter covers approximately 10% and finds its way towards the production of biogas, among other things.