Assertion: kraft lignin | /r/MadeOf | available
Facets:
value: for many years
type: TEMPORAL
value: commercially
type: MANNER
value: earlier
type: TEMPORAL
Source sentences:
text: As noted earlier, kraft lignin has been made commercially available for many years at a production rate of about 20,000 tons per year (Gellerstedt et al. 2013) and possibly higher at present.