专利名称：Process for producing pyromellitic dianhydride
芭蕾女孩发明人：Hara, Tadanori,Daito, Noboru
老师的生日申请号：EP90112268.9
申请日：19900627
玄彬身高
公开号：EP0405508A2
公开日：
19910102
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粗糙的手摘要：Pyromellitic dianhydride, uful as raw material for the manufacture of polyimides, is prepared in high yield and purity by the reaction of benzene derivatives such as benzene, ethylbenzene, diethylbenzenes, and triethylbenzenes with an ethylating agent in the prence of a Friedel-C rafts catalyst, the paration of tetraethylbenzenes from the reaction products by distillation, and the catalytic vapor-pha oxidation of tetraethylbenzenes using a catalyst containing vanadium pentoxide and titanium dioxide as active ingredients.团雁淘
申请人：NIPPON STEEL CHEMICAL CO., LTD.
地址：13-16 Ginza 5-chome Chuo-ku Tokyo JP
语重心长的意思
国籍：JP
梦见来例假
代理机构：Strehl Schübel-Hopf Groening & Partner
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