Characterization of the black liquor was carried out following
procedures found in literature (TAPPI T211om-93): density:
1.054 g/cm3, pH 12.9, total dry solids (%): 15.8, lignin content:
67.4 g/L, content of organic material (%): 5.6 and content of inorganic
material (%): 10.2. Dissolved lignin in black liquorwasisolated
by precipitation with H2SO4 (pH around 2). The precipitated lignin
was filtered through a 0.45m nylon filter to recover lignin. After
filtration, precipitate was washed twice with acidified water (pH
2) and then was dried at 50 ◦C. PLA (NatureWorks PLA Polymer
3051D) was from NatureWorks LCC (glass transition temperature
55–65 ◦C, melt temperature 150–165 ◦C, Mw: 169.000 g/mol).
Formamide (99.5%), pyridine (99%), acetic anhydride (99%) and
hydrochloric acid (37%) were supplied by Panreac.
Characterization of the black liquor was carried out followingprocedures found in literature (TAPPI T211om-93): density:1.054 g/cm3, pH 12.9, total dry solids (%): 15.8, lignin content:67.4 g/L, content of organic material (%): 5.6 and content of inorganicmaterial (%): 10.2. Dissolved lignin in black liquorwasisolatedby precipitation with H2SO4 (pH around 2). The precipitated ligninwas filtered through a 0.45m nylon filter to recover lignin. Afterfiltration, precipitate was washed twice with acidified water (pH2) and then was dried at 50 ◦C. PLA (NatureWorks PLA Polymer3051D) was from NatureWorks LCC (glass transition temperature55–65 ◦C, melt temperature 150–165 ◦C, Mw: 169.000 g/mol).Formamide (99.5%), pyridine (99%), acetic anhydride (99%) andhydrochloric acid (37%) were supplied by Panreac.
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