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    • 7. 发明授权
    • Method to produce aromatic dicarboxylic acids using cobalt and zirconium
catalysts
    • 使用钴和锆催化剂生产芳族二羧酸的方法
    • US06153790A
    • 2000-11-28
    • US201963
    • 1998-12-01
    • Raymond Lawrence JuneMichael Wayne PotterEdward James SimpsonCharles Lee Edwards
    • Raymond Lawrence JuneMichael Wayne PotterEdward James SimpsonCharles Lee Edwards
    • C07C51/255
    • C07C51/255Y02P20/582
    • A process to produce terephthalic acid is provided, the process including the steps of: providing a feed stream comprising a dialkyl substituted aromatic and in an organic acid solvent: contacting the feed stream with an oxidant, the oxidant containing at least 50% by volume oxygen and at an oxygen partial pressure of at least 1 psia, at a temperature between about 80.degree. C. and about 130.degree. C., in the presence of a catalyst system comprising zirconium and cobalt, wherein the contacting is done in a stirred tank reactor; removing from the stirred tank reactor a vapor stream comprising the organic acid, water vapor and unreacted oxidant; condensing at least a portion of the organic acid and water from the vapor stream; separating at least a portion of the water from the organic acid back to the stirred tank reactor; returning at least a portion of the condensed organic acid back to the stirred tank reactor; continuously recovering from the stirred tank reactor a product comprising a diacid substituted aromatic; isolating solid crystals of diacid substituted aromatic from the reactor product; and recovering from the solid crystals a diacid substituted aromatic having a purity of preferably at least 97% by weight.
    • 提供了制备对苯二甲酸的方法,该方法包括以下步骤:提供包含二烷基取代的芳族化合物和在有机酸溶剂中的进料流:使进料流与氧化剂接触,氧化剂含有至少50体积%的氧 在约80℃至约130℃的温度下,在包含锆和钴的催化剂体系的存在下,在至少1psia的氧分压下,在搅拌釜反应器中进行接触 ; 从搅拌釜反应器中除去包含有机酸,水蒸汽和未反应的氧化剂的蒸气流; 从蒸气流中冷凝至少一部分有机酸和水; 将至少一部分水与有机酸分离回搅拌釜反应器; 将至少一部分冷凝的有机酸返回到搅拌釜反应器中; 从搅拌釜反应器连续回收包含二酸取代的芳族化合物的产物; 从反应器产物中分离出二酸取代芳族化合物的固体晶体; 并从固体晶体中回收纯度优选至少97重量%的二酸取代芳族化合物。