Assertion: glycerin | /r/HasProperty | obtained as a by-product
Facets:
value: until 1948
type: TEMPORAL
value: in making soaps
type: LOCATION
Source sentences:
text: Until 1948 all glycerol was obtained as a by-product in making soaps from animal and vegetable fats and oils, but industrial syntheses based on propylene or sugar has accounted for an increasingly large percentage of production since that time.