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21. 发明授权

US3944601A Quality of phthalic acids improved by strong inorganic acids 失效
标题翻译：通过强无机酸改善邻苯二甲酸的质量
公开(公告)号：US3944601A
公开(公告)日：1976-03-16
申请号：US316858
申请日：1972-12-20
申请人： George E. Kuhlmann
发明人： George E. Kuhlmann
IPC分类号： C07C51/265 , C07C51/33 , C07C63/26
CPC分类号： C07C51/265
摘要： Phthalic acids of improved quality are obtained direct from oxidation of xylenes with molecular oxygen in oxidation zone having less than one equivalent of strongly acidic inorganic acid per equivalent of catalyst metal present in addition to a liquid phase acetic acid solution of one or more heavy metal oxidation catalyst and bromine releasing bromide compound. Particularly useful inorganic acids are those having ionization constant K.sub.A greater than 1.0 .times. 10.sup.-.sup.2, e.g. hydrobromine, nitric, sulfuric and phosphoric acids. Such quality improvement is manifested by decreased aldehydic acid and toluic acid impurity contents.
摘要翻译：改进质量的邻苯二甲酸直接从二氧化碳的氧化与分子氧在氧化区具有小于1当量的强酸性无机酸每当量的催化剂金属存在除了一种或多种重金属氧化物的液相乙酸溶液催化剂和溴离子溴化物。特别有用的无机酸是具有大于1.0×10 -2的电离常数KA的那些。氢溴酸，硝酸，硫酸和磷酸。这种质量改善体现在醛酸和甲苯酸杂质含量的降低。

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