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公开(公告)号：US06472498B2
公开(公告)日：2002-10-29
申请号：US09923466
申请日：2001-08-06
申请人： Ryoji Sugise , Shuji Tanaka , Kohichi Kashiwagi , Takashi Doi , Hirofumi Ii , Masayuki Nishio , Shinichi Yoshida , Yutaka Asada , Kazuo Miyamoto
发明人： Ryoji Sugise , Shuji Tanaka , Kohichi Kashiwagi , Takashi Doi , Hirofumi Ii , Masayuki Nishio , Shinichi Yoshida , Yutaka Asada , Kazuo Miyamoto
IPC分类号： C08G6400
CPC分类号： C07C68/08 , C07C69/96 , C08G64/307
摘要： A composition consisting essentially of a diaryl carbonate and contains a furan ring-containing compound in an amount of not more than 1 ppm is favorably employable for producing less colored polycarbonate.
摘要翻译： 基本上由碳酸二芳酯组成并且含有不超过1ppm的含呋喃环的化合物的组合物有利地用于制备较少着色的聚碳酸酯。
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公开(公告)号：US5631396A
公开(公告)日：1997-05-20
申请号：US647164
申请日：1996-05-09
申请人： Keigo Nishihira , Shinichi Yoshida , Shuji Tanaka , Yutaka Asada
发明人： Keigo Nishihira , Shinichi Yoshida , Shuji Tanaka , Yutaka Asada
CPC分类号： C07C68/00
摘要： Dimethyl carbonate ((CH.sub.3 O).sub.2 CO) is continuously produced by a catalytic reaction (first step) of CO with CH.sub.3 NO.sub.2, with a significantly reduced loss of CH.sub.3 ONO by the process including a second step wherein (CH.sub.3 O).sub.2 CO in a reaction product gas of the first step is absorbed by dimethyl oxalate while contacting the resultant liquid fraction with CO to recover CH.sub.3 ONO, a third step wherein CH.sub.3 ONO is regenerated from NO in the condensed gas fraction produced in the second step and molecular oxygen and CH.sub.3 OH introduced into the third step, the resultant regenerated gas fraction being recycled and reused as a feed gas for the first step, and a fourth step wherein (CH.sub.3 O).sub.2 CO contained in the liquid fraction of the second step is collected.
摘要翻译： 通过CO与CH3NO2的催化反应（第一步）连续制备碳酸二甲酯（（CH 3 O）2 CO），通过包括第二步骤的CH 3 NOO的显着降低的损失，其中（CH 3 O）2 CO在反应产物气体中的 第一步被草酸二甲酯吸收，同时使所得液体馏分与CO接触以回收CH 3 NOO，第三步是在第二步产生的冷凝气体馏分中从NO再生CH3ONO，并将第三步中引入分子氧和CH3OH， 所产生的再生气体馏分被再循环并重新用作第一步骤的进料气体;以及第四步骤，其中收集第二步骤的液体馏分中所含的（CH 3 O）2 CO。
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