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[9001923.] رقم البحث : 9001923 - |
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Hydrothermal, Solvolysis and Catalytic pyrolysis of Kraft lignin / التأثير الحرارى المائي والحفزي لللجنين |
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قطاع الدراسات الزراعية / |
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Egyptian sٍugar journal / |
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اسماء فتحى محمود - مؤلف رئيسي |
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Abdel-Aal M. Gaber |
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ٍsugar technology
Hydrothermal, Solvolysis and Catalytic pyrolysis of Kraft lignin |
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Kraft lignin were subjected to hydrothermolysis and solvolysis at 400- 450 °C in the presence of water and water/ethanol with ratio 1:1 v/v gave rise to methanol, phenol (XVII), 2,3-dihydrobenzofuran (IX), 3-methyl-p-anisaldehyde (XIII), 5-styryl-2,3-dihydrobenzo furan (XII), 3-(4-hydroxy-3-methoxyphenyl) propanoic acid (VII), 1-(4-hydroxy-3,5-dimethoxyphenyl) ethanone (acetosyringone) (XXIII) and 3,4-dimethoxy cinnamic acid (XXII) , respectively in addition to phenolic monomers and other compounds. On the other hand, Kraft lignin on catalytic pyrolysis under reflux in the presence of CrCl3 and HCl as a catalyst under the same conditions leads to the formation of 2-methoxyphenol (guaiacol) (XV), 4-(4-propylcyclohexyl) phenol (XXVII), 2,6-dimethoxyphenol (syringol) (XVI), 2-hydroxy-3-methoxybenzaldehyde (vanillin) (XIV), 1-(4-hydroxy-3,5-dimethoxyphenyl) ethanone (acetosyringone) (XXIII) and 4-(2-cyclohexylpropyl)-2-methylphenol (XXXI). 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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