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Unformatted text preview: ysia E-mail: [email protected] Lignin is the second most organic polymer on earth which can be used in various a pplications. The water solubilitiness of lignin is an important challenge for this compound to be accepted for industrial usage like rust converter. Hydroxylation helps to increase the solubility and to increase the number of carboxyl groups in the compound. In this study, diluted hydrochloric acid is utilized for treatment of the soda lignin. The infrared spectra of native and hydrolyzed lignin treated with diluted hydrochloric acid are −1 examined. All lignins show a broad band at 3400 cm , attributed to hydroxyl groups in phenolic -1 structures. The hydrolyzed lignin spectrum shows a high intensity phenolic OH band at 1375 cm and a -1 decrease in the intensities of CH vibration of methoxyl group at 2920 - 2810 cm . The hydrolysis -1 treatment also increases the intensity of the secondary cyclic alcohols of C-OH band at 1047 cm . The -1 intensity of C=C of aromatic ring band at 1680 and 1605 cm is highly affected by the treatment of lignin with hydrochloric acid, where decrease the intensities larger than in case o f lignin treated with HCl. The thermal behaviors of these lignin samples have been studied. The initial and char temperatures of lignin were performed at 30 and 700 °C for native lignin and hydrolyzed lignin, respectively under nitrogen atmosphere. From TGA, it was observed that the native lignin exhibited one small peak at 198 °C two important well-defined degradation stages at 296 and 387 °C; hydrolyzed lignin presents only one main weight loss at 178 °C although from DTG curve. MAT-P19 TERT-BUTYLATION OF PHENOL USING HIERARCHICAL ZEOLITIC MATERIAL WITH ZSM -5 STRUCTURE Rosilda Selvin, Hsui-Ling Hsu, De-Yu Chen and Li-We Xiao Department of Chemical and Materials Engineering, Lun ghwa University of Science and Technology, 300, Wan-shou Rd., Sec. 1, Kueishan, Taoyuan, Taiwan E-mail: [email protected] Zeolites are microporous crystalline materials, widely used as catalysts, ion -exchangers, and adsorbents. In recent years, mu...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.
- Spring '11