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nature : also known as wood or lignin. Plant fibers exist in a kind of aromatic polymers. The plant tissue with increased cell wall, the role of bonding fibers. To isolate the lignin is tawny amorphous powder. Its composition and the nature of more complex and have good activity. Animals can not be assimilated in the soil can be transformed into humus. The pulp contains lignin yellowing, not bleach. The pulping process, the mechanical adhesion major role in the destruction of their chemical method, such as using lye solution to the majority of its so with the cellulose and hemicellulose separation. According to the pulp lignin content can be divided into hard or soft pulp slurry, the former lignin contains about 3%, which amounted to approximately 8%. Semi-chemical pulp may contain about 15%. Mechanical wood pulp contains almost all. It also prepared for vanillin, but also uses tanned or other adhesive. Separation useful concentrated acid soluble fiber and plant with two alkaline extraction of lignin. The first is a 72% sulfuric acid soluble polysaccharide compounds (organic solvent extraction of the sample), lignin precipitate out. Caustic soda solution to the latter 170-180 ° C at high temperature test materials processing, extraction of lignin, and then extract plus a sprig of precipitation so isolated.
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