Carbonization of Redactive Ethylation Product of Yubari Coal Under the High Pressure

The present report deals with carbonization of ethylated product of Yubari coal at 400 and 500°C, <20 and 1000 kg/Cm2 of nitrogen for 5 h. in order to obtain the needle like coke.Temperature and pressure effects to the ethylated product were at first investigated, then compared with those to the natural coal. The variance analyses (two-way layout) were applied to the various data such as the specific extinction coefficient K of carbonization products at each IR absorption band and the solubility of them in benzene and pyridine, and then it was found that benzene extract yield of carbonization products were only affected by temperature differences between 400 and 500°C, while pyridine extract yield affected by these interaction as well as temperature and pressure (significance at 1%, respectively)Microscopic observation for carbonization products under the normal pressure of methylated- and ethylated products from Yubari coal and Taiheiyo coal, showed that mesophase did not exist in them. These findings suggested that alkyl groups introduced evolved up to ca. 370°C and did not contribute the f ormation of mesophase. Furthermore, mean structure of pyridine extracts of carbonization products were also discussed.