Recovery lignin by aciad sulfile form kraft pulp mill and use for Lignin - Phenol- Formadyhyde adhensive synthesis Lignin in black liquor, which is currently burned
Keywords:
Black liquor, lignin, FTIR spectroAbstract
Lignin in black liquor, which is currently burned to recover in boiler in the Kraft pulping mills. However, a part of lignin in black liquor can be recovered and using in some industrial field. In this process, the black liquor is extracted from acid sulfide to precipitate the lignin. The precipitated lignin is washed with H2SO4 and water to remove impurities. The primary objective of the work in this research was to investigate the fundamentals of lignin precipitation in black liquor and, more specifically, the yield of the lignin precipitation and some properties of lignin. The influences of some important process parameters such as pH, temperature, and concentration of acid on the yield of lignin precipitation were investigated. The results research with pH = 2, temperature 85 o C and concentration of acid sulfuric of 35% gave the precipitation yield of lignin were 33.94%. The analytical methods used were FTIR spectroscopy, and analysis result revealed that the functional groups of parameters extracted were similar to each other
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