| 摘要 |
PURPOSE:To produce a purified styrene advantageously, by hydrogenating styrene in the presence of a catalyst while keeping water content in the reaction system at a fixed value and maintaining the reaction temperature in a fixed range to selectively hydrogenate highly unsaturated impurities contained. CONSTITUTION:In selectively hydrogenating highly unsaturated impurities contained in styrenes, namely acetylenes such as phenylacetylene and diolefins, in the presence of a hydrogenating derivative and removing the impurities, water content in a raw material containing the styrenes to be fed to the reaction is controlled <=2,000wt. ppm, especially <=1,500wt. ppm and the reaction temperature is regulated at 0-120 deg.C, especially 20-90 deg.C. By this method, the impurities in the styrenes can be stably removed and consumption of useful substance such as styrene, etc., by hydrogenation is a little. Styrene suitable for obtaining polymers having stable qualities free from variability of polymerization characteristics is obtained. |
