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    • 3. 发明申请
    • Processes for producing terephthalic acid
    • 生产对苯二甲酸的方法
    • US20060205977A1
    • 2006-09-14
    • US11214406
    • 2005-08-29
    • Charles SumnerRobert HembreDavid LangeGino LavoieBrent TennantThomas FloydBryan DavenportDaniel ComptonJoseph Bays
    • Charles SumnerRobert HembreDavid LangeGino LavoieBrent TennantThomas FloydBryan DavenportDaniel ComptonJoseph Bays
    • C07C51/16C07C51/255
    • C07C51/265C07C63/26
    • Processes for producing terephthalic acid are disclosed, the processes comprising combining in a reaction medium p-xylene, a solvent comprising water and one or more saturated organic acids having from 2-4 carbon atoms, and an oxygen-containing gas, at a temperature from about 135° C. to about 165° C., in the presence of a catalyst composition comprising cobalt atoms and manganese atoms, with bromine atoms provided as a promoter. The amount of cobalt used may be from about 1,800 ppm to about 6,000 ppm, with respect to the total weight of the liquid in the reaction medium, and the weight ratio of cobalt to manganese may be from about 40 to about 400. The processes according to the invention produce terephthalic acid as a precipitated reaction product, with typically no more than about 10 ppm 2,6-dicarboxyfluorenone produced, with respect to the weight of the terephthalic acid produced, or no more than about 20 ppm 2,6-dicarboxyfluorenone, with respect to the total weight of the reaction medium, per batch or upon one pass through a reactor. The terephthalic acid so produced may be further purified by one or more additional oxidation reactions, without the need for expensive hydrogenation purification processes.
    • 公开了制备对苯二甲酸的方法,该方法包括在反应介质中混合对二甲苯,包含水和一种或多种具有2-4个碳原子的饱和有机酸的溶剂和含氧气体, 约135℃至约165℃,在包含钴原子和锰原子的催化剂组合物存在下,提供溴原子作为助催化剂。 相对于反应介质中的液体的总重量,所使用的钴的量可以为约1,800ppm至约6,000ppm,并且钴与锰的重量比可以为约40至约400.根据 本发明产生对苯二甲酸作为沉淀反应产物,相对于所生产的对苯二甲酸的重量,通常不超过约10ppm的2,6-二羧基芴酮,或不超过约20p​​pm的2,6-二羧基芴酮 ,相对于反应介质的总重量,每批次或一次通过反应器。 如此生产的对苯二甲酸可以通过一个或多个另外的氧化反应进一步纯化,而不需要昂贵的氢化纯化方法。