Influence of alkali on the carbonization process—I: Carbonization of 3,5-dimethylphenol-formaldehyde resin with NaOH

✍ Scribed by Yasumasa Yamashita; Koji Ouchi

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 457 KB
• Volume: 20
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(82)90072-0

✦ Synopsis

Dimethylphenol-formaldehyde resin was carbonized with NaOH. It was found that as the amount of NaOH increases, the temperature of the hydrogen gas evolution is significantly lowered and its amount increases enormously. This is explained by the substitution reactions of H with NaO-groups followed by the condensation reaction after the liberation of NaoH. The tarry product almost disappears because of the formation of the network structure. At a higher temperature, the evolution of CO increases considerably with the addition of NaOH. The large weight decrease at this temperature range is related to this CO evolution and to the sublimation of reduced metallic Na. The catalytic action of alkali in the steam gasification of coal or carbon may be explained by such reduction of alkali with carbon, accompanied by evolution of CO, and by a following reoxidation of the reduced metallic Na with steam to form the alkali again, evolving hydrogen gas.