公开(公告)号：US5880310A

公开(公告)日：1999-03-09

申请号：US65233

申请日：1998-04-23

申请人： Kuniaki Ageishi ,  Tadayoshi Takefumi ,  Tsutomu Numoto ,  Tsuguji Kawabata ,  Etsuo Urabe

发明人： Kuniaki Ageishi ,  Tadayoshi Takefumi ,  Tsutomu Numoto ,  Tsuguji Kawabata ,  Etsuo Urabe

IPC分类号： C07C67/08 ,  C07C67/48

CPC分类号： C07C67/08

摘要： Provided is a process for producing a plasticizer ester characterized by previously removing dissolved oxygen in a starting alcohol, and then subjecting an organic acid or its anhydride and the alcohol to an esterification reaction in the presence of an organic metal compound catalyst, which process can substantially reduce formation of coloring impurities and can easily provide a plasticizer ester having a low degree of coloring.Further, a plasticizer ester having a high volume resistivity can easily be obtained by adding an alkaline aqueous solution to a reaction product obtained by an esterification reaction to conduct neutralization of an unreacted acid and hydrolysis of the catalyst, further blowing a carbon dioxide gas to convert the residual alkali into a carbonate, recovering an excess alcohol, and then conducting purification through finefiltration using a filter aid or further in combination with adsorption treatment.

摘要翻译： 提供一种生产增塑剂的方法，其特征在于预先除去起始醇中的溶解氧，然后在有机金属化合物催化剂存在下使有机酸或其酸酐和醇进行酯化反应，该方法基本上 减少着色杂质的形成，并且可以容易地提供着色程度低的增塑剂酯。 此外，通过将碱性水溶液加入到通过酯化反应获得的反应产物中以导致未反应的酸的中和并水解催化剂，进一步吹入二氧化碳气体以进行转化，可以容易地获得具有高体积电阻率的增塑剂酯 将残留的碱转化成碳酸盐，回收过量的醇，然后通过使用助滤剂进行微滤或进一步与吸附处理组合进行纯化。

公开(公告)号：US06458994B2

公开(公告)日：2002-10-01

申请号：US09861629

申请日：2001-05-22

申请人： Atsushi Okoshi ,  Etsuo Urabe ,  Masashi Yabuno ,  Hiroshi Ogawa ,  Kazuo Tanaka

发明人： Atsushi Okoshi ,  Etsuo Urabe ,  Masashi Yabuno ,  Hiroshi Ogawa ,  Kazuo Tanaka

IPC分类号： C07C5116

CPC分类号： C07C51/235 ,  C07C63/307

摘要： A process for producing a polycarboxylic acid which comprises performing liquid phase oxidation of polyalkyl-substituted aromatic aldehyde and/or oxide derivative of polyalkyl-substituted aromatic aldehyde as raw material for oxidation with molecular oxygen at two stages in water solvent in the presence of a catalyst comprising bromine or both bromine and a heavy metal(s) at a temperature of 180 to 280 ° C., thereby producing trimellitic acid or pyromellitic acid, wherein said liquid phase oxidation is performed in a continuous operation at the first stage and in a continuous operation or in a batch operation at the second stage and a total amount of bromine in said catalyst is divided to add separately at each the first stage and the second stage.