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1. 发明授权

US3979448A Processes for the continuous production of aromatic carboxylic acids by oxidation with nitric acid of aromatic compounds containing oxidizable acyclic substituents 失效
标题翻译：通过用含有可氧化的无环取代基的芳族化合物的硝酸氧化连续生产芳族羧酸的方法
公开(公告)号：US3979448A
公开(公告)日：1976-09-07
申请号：US478395
申请日：1974-06-11
申请人： Kurt Handrick , Anton Benning , Dietrich George , Jurgen Schlegel
发明人： Kurt Handrick , Anton Benning , Dietrich George , Jurgen Schlegel
IPC分类号： C07C63/00 , C07C51/00 , C07C51/275 , C07C67/00 , C07C205/24 , C07C205/57 , C07C51/33
CPC分类号： C07C51/275 , C07C205/24 , C07C205/57
摘要： Processes for the continuous production of aromatic carboxylic acids by reaction of nitric acid with an aromatic compound having an oxidizable alkyl or alkoxyalkyl substitutent which comprise mixing the aromatic compound in the form of small droplets with a large volume of dilute nitric acid having a concentration between 2 and 14% by weight of nitric acid that is maintained at a superatmospheric pressure between 15 and 80 atmospheres and at a temperature between 160.degree. and 230.degree.C, which processes comprise continuously passing a reaction mixture consisting of the aromatic compound and the dilute nitric acid through a series of at least three consecutively arranged vertical reactor column in each of which the ratio of the weight of the reaction mixture containing the dilute nitric acid to the weight of the aromatic compound is continuously maintained at at least 50:1, the nitric acid concentration in each of the reactor column being continuously maintained at an originally preselected concentration by the addition of amounts of more-concentrated nitric acid while aliquot portions of the aromatic compound based upon the number of vertical reactor columns in the series are continuously introduced into each of the reactor columns, the reaction zones each being maintained at an optimal oxidation temperature between 160 and 230.degree.C for the aromatic compound that is being oxidized, and continuously passing the reaction mixture into a final reactor column that is maintained at a higher temperature than the preceding series of reactor columns, and continuously discharging the reaction mixture containing between 10 and 20% by weight of the aromatic carboxylic acid thus produced from the final reactor column.
摘要翻译：通过硝酸与具有可氧化烷基或烷氧基烷基取代基的芳族化合物的反应连续生产芳族羧酸的方法，其包括将小液滴形式的芳族化合物与大体积的浓度为2 和14重量％的硝酸，其保持在15至80个大气压之间的超大气压力和160-230℃的温度，该方法包括连续通过由芳族化合物和稀硝酸组成的反应混合物通过一系列至少三个连续排列的立式反应器塔，其中含有稀硝酸的反应混合物的重量与芳族化合物的重量的比例连续保持在至少50:1，硝酸每个反应器塔中的浓度连续保持在原来的预选中通过加入较多浓度的硝酸的浓度，同时将基于该系列中的垂直反应器塔的数量的芳族化合物的等分试样部分连续引入每个反应器塔中，每个反应区保持在最佳状态氧化温度在160〜230℃之间，待氧化的芳族化合物，并将反应混合物连续通入保持在比上一系列反应器塔高的温度的最终反应器塔中，并连续排出含有 10至20重量％的由最终反应器塔产生的芳族羧酸。

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