Assertion: glycerin | /r/HasProperty | a by-product
Facets:
value: in the production of biodiesel
type: PURPOSE
Source sentences:
text: When fatty acid esters are combined with lye to make soap, glycerol is a by-product which can be separated from the soap.
text: Although less common, glycerin can also be produced from petroleum sources and is a by-product in the production of biodiesel.