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[9001679.] رقم البحث : 9001679 - |
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Thermal Treatment of Lignin as a Function of Temperatures and Reacting Conditions / vol. 9 / 2017 |
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قطاع الدراسات الزراعية / |
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Egyptian sٍugar journal / |
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Abdel-Aal M. Gaber - مؤلف رئيسي |
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Treatment
pulping of bagasse from paper industry
Thermogravimetric analysis |
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Samples of Kraft lignin were subjected to thermal treatment in inert (pyrolysis) at 300-350oC and 400-450oC and/or reacting conditions as solvolysisin different organic solvents has been studied. The pyrolysis of kraft lignin at 300-350oC and 400-450oC gave rise to syringol (55.16% and 31.78%, respectively) as major products in addition to phenolic monomers and other compounds. On the other hand, solvolysis of kraft lignin in formic acid as hydrogen source and in the presence of formic acid and isopropanol mixture led to the formation of 1-(4-hydroxy-3,5-dimethoxyphenyl) ethanone (acetosyringone) (42.27 and 30.96%, respectively) as the major products beside methoxylated and/or phenolic benzene compounds as well as aliphatic hydrocarbons. A free radical dominant reaction pathway is proposed to explain the products formation. Various products are formed by bond cleavages and secondary reactions. |
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