Abstract
After cellulose, lignin and hemicelluloses constitute. the most abundant organic renewable raw materials. According to Lieth (1973) the annual growth rate for both of them worldwide amounts to some 12 billion tons. In the pulp mills both are obtained as by-products in the spent liquors, which are mainly burnt. In this case they serve as energy suppliers for the pulp mills. However, this kind of utilisation is not very satisfactory for the following reasons:
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Vast amounts of water have to be evaporated from the aqueous solutions before burning them, so that most of the energy gained is already needed as evaporation energy.
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Due to the high amounts of chemicals in the spent liquors, SO2, mercaptans and other acidic, toxic or corrosive gases are formed, which for environmental reasons have to be absorbed from the off-gases carefully before releasing them into the air, causing additional costs.
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Lignins as well as hemicelluloses, unlike coal or crude oil, constitute valuable organic raw materials with specific chemical structures, namely polyphenols and polysaccharides.
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© 1986 ECSC, EEC, EAEC, Brussels and Luxembourg
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Nimz, H.H. (1986). Products Derived from Hemicelluloses and Lignin. In: Raymond, W.F., Larvor, P. (eds) Alternative Uses for Agricultural Surpluses. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4327-8_6
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DOI: https://doi.org/10.1007/978-94-009-4327-8_6
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