Assertion: lignin | /r/HasProperty | purified by its treatment
Facets:
value: several times
type: TEMPORAL
value: with sulfuric acid
type: OTHER
Source sentences:
text: This lignin was purified by its treatment with sulfuric acid (1%) several times and washed extensively with hot water to remove the inorganic substances and solubilize the residual sugars (El Mansouri et al.2006 and 2011a).The formaldehyde (35to40% aqueous solution) and phenol (99%), used in this work were purchased from Sigma Aldrich and used as received.