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1. 发明授权

US07589230B2 Process for the preparation of diphenic acid 有权
标题翻译：二苯甲酸的制备方法
公开(公告)号：US07589230B2
公开(公告)日：2009-09-15
申请号：US10393407
申请日：2003-03-20
申请人： Kaushal Kishore Tiwari , Kumares Chandra Bit , Sanjay Kumar Thakur , Kamlesh Kumar Mishra , Sukuru Ramakrishna Rao
发明人： Kaushal Kishore Tiwari , Kumares Chandra Bit , Sanjay Kumar Thakur , Kamlesh Kumar Mishra , Sukuru Ramakrishna Rao
IPC分类号： C07C51/255 , C07C51/42
CPC分类号： C07C51/31 , C07C63/331
摘要： The present invention provides a process for the preparation of diphenic acid from phenanthrene which comprises heating phenanthrene and glacial acetic acid, adding drop-wise a pre-determined amount of 30% hydrogen peroxide, heating the resulting mixture after completion of drop wise addition of hydrogen peroxide, distilling the resulting mixture under reduced pressure to make the volume half, cooling the mixture till diphenic acid crystalises out, filtering the cooled mixture and boiling the residue after adding 10% solution of sodium carbonate and activated charcoal, filtering and discarding the residue; acidifying the filtrate with hydrogen chloride; cooling the resultant mixture till more diphenic acid crystallises out; repeating filtration till pure diphenic acid is obtained.
摘要翻译：本发明提供了一种从菲制备二苯酸的方法，其中包括加热菲和冰醋酸，逐滴加入预定量的30％过氧化氢，加完所有混合物后滴加氢过滤，减压蒸馏生成的混合物，使体积一半，冷却混合物直到二苯甲酸结晶出来，过滤冷却的混合物，加入10％碳酸钠和活性炭后，残留物煮沸，过滤并弃去残留物; 用氯化氢酸化滤液; 冷却所得混合物，直到更多的二酚酸结晶出来; 重复过滤直至得到纯二苯酸。

2. 发明授权

US07135588B2 Method of producing dimethyl phthalate from naphthalene based chemicals 有权
标题翻译：萘类化学品生产邻苯二甲酸二甲酯的方法
公开(公告)号：US07135588B2
公开(公告)日：2006-11-14
申请号：US10793700
申请日：2004-03-05
申请人： Kumares Chandra Bit
发明人： Kumares Chandra Bit
IPC分类号： C07C67/48
CPC分类号： C07C67/08 , C07C69/80
摘要： The present invention results to an improved and environment friendly method of producing dimethyl phthalate of about 99% purity from naphthalene based chemicals, said method comprising steps of mixing phthalic anhydride with methanol in the ratio ranging between 2:3 to 3:2, adding catalyst(s) to the mixture wherein, the ratio of phthalic anhydride and the catalyst is ranging between 3:1 to 15:1, adding a promoter to the resultant of step (b) wherein, the promoter is in the range of 1.5 to 2.0% by weight of phthalic anhydride, refluxing the resulted mixture at a temperature ranging between 60 to 100° C., for time duration ranging between 6 to 12 hrs. in the presence of benzene, wherein the ratio of benzene to phthalic anhydride is in the range of 1:5 to 2:1 to obtain distillate, neutralizing the residue with about 10% caustic soda, extracting the neutralized residue with the benzene, distilling at the temperature ranging between 140 to 150° C. under 10 mm of mercury to obtain dimethyl phthalate.
摘要翻译：本发明得到了一种改进和环保的萘系化学品生产邻苯二甲酸二甲酯约99％纯度的方法，所述方法包括以下步骤：将邻苯二甲酸酐与甲醇的混合比例为2：3至3：2，加入催化剂其中，邻苯二甲酸酐和催化剂的比例在3:1至15:1之间，向步骤（b）的所得产物加入助催化剂，其中助催化剂在1.5-2.0的范围内重量的邻苯二甲酸酐，将所得混合物在60至100℃的温度范围内回流，持续时间为6至12小时。在苯的存在下，其中苯与邻苯二甲酸酐的比例在1:5至2:1的范围内以获得馏出物，用约10％苛性钠中和残留物，用苯提取中和的残留物，蒸馏在温度在140至150℃之间，在10mm汞柱下，得到邻苯二甲酸二甲酯。

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