THE EFFECT OF ACID CONCENTRATION (H2SO4) ON THE YIELD AND FUNCTIONAL GROUP DURING LIGNIN ISOLATION FORM BLACK LIQUOR OF WASTE PULP AND PAPER INDUSTRY
DOI:
https://doi.org/10.70169/VJFS.1173Keywords:
Black liquor, FT - IR, ligninAbstract
Black liquor, which is currently incinerated in the recovery boiler of the kraft pulp mill, can be recovered and converted into a wide range of bio - based products through acid precipitation. In this study, a portion of the black liquor was extracted from the evaporation system to precipitate lignin. The black liquor used for lignin recovery via acid treatment was sourced from black liquor generated by the Bai Bang paper mill (Phu Tho province).The precipitated lignin was re - alkalized and subsequently washed with sulfuric acid (H₂SO₄) and water to remove impurities. This study investigates the effect of varying H₂SO₄ concentrations (14%, 20%, 26%, and 32% by weight) on lignin extraction yield, and compares the functional groups of impure and purified lignin using fourier - transform infrared spectroscopy (FT-IR). According to the results, crude lignin yielded the highest extraction efficiency at 50.81% when treated with H₂SO₄, while purified lignin yielded 21.89% at an acid concentration of 20%. The color of the extracted lignin tended to resemble that of purified lignin. Additionally, the FT - IR spectra revealed that the functional group peaks of the lignin obtained in this study closely matched those of purified lignin more than those of crude lignin.
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