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    • 15. 发明授权
    • Catalytic purification and recovery of dicarboxylic aromatic acids
    • 催化净化和回收二羧酸芳香酸
    • US5756833A
    • 1998-05-26
    • US778297
    • 1997-01-02
    • Bruce I. RosenThomas M. Bartos
    • Bruce I. RosenThomas M. Bartos
    • C07C51/487C07C51/42
    • C07C51/487
    • Processes using a titanium dioxide-supported purification catalyst are disclosed for purification of relatively impure dicarboxylic aromatic acid produced by liquid-phase oxidation of a suitable benzene or naphthalene having two oxidizable ring substituents, and/or by recovery from polyester resin comprising repeating units of the dicarboxylic aromatic acid residue and repeating units of dihydric alcohol residue. Purification comprises passing an aqueous solution of dicarboxylic aromatic acid with small amounts of organic impurities consisting of oxygen-containing aromatic co-products of oxidation and/or other organic components, through a particulate bed of purification catalyst comprising a noble metal on a titanium dioxide support under conditions suitable for decarbonylation of organic impurities. Generally, at least one weight percent of the titanium dioxide support is in the rutile crystalline phase. Optionally, effluent aqueous solution from the bed containing noble metal on the titanium dioxide support is passed through a subsequent particulate bed of another purification catalyst in the presence of a molecular hydrogen-containing gas. Hydrogenation of the aqueous solution subsequent to decarbonylation further reduces organic impurities in dicarboxylic aromatic acid recovered by crystallization and separation from the aqueous solution. The invention provides improved processes for preparation of purified terephthalic acid wherein purified terephthalic acid product is recovered from its mother liquor while maintaining temperatures within a range downward from about 100.degree. C. to about 25.degree. C. and pressures near or at atmospheric pressure.
    • 公开了使用二氧化钛负载的净化催化剂的方法,用于纯化通过液相氧化合适的苯或具有两个可氧化环取代基的萘产生的相对不纯的二羧酸芳族化合物,和/或通过从包含重复单元的聚酯树脂 二羧酸残基和二元醇残基的重复单元。 纯化包括将二氧化碳芳族酸的水溶液与少量由氧化和/或其它有机组分的含氧芳族共同产物组成的有机杂质通过二氧化钛载体上含有贵金属的净化催化剂颗粒床 在适合有机杂质脱羰作用的条件下。 通常,至少一重量百分比的二氧化钛载体是金红石结晶相。 任选地,在含有分子含氢气体的存在下,将含有二氧化钛载体上的贵金属的床的流出水溶液通过另一种纯化催化剂的随后的颗粒床。 脱羰后的水溶液的氢化进一步降低了通过结晶回收的二羧酸芳族化合物中的有机杂质,并从水溶液中分离出来。 本发明提供了制备纯化对苯二甲酸的改进方法,其中从其母液中回收纯化的对苯二甲酸产物,同时将温度保持在约100℃至约25℃的范围内,接近或在大气压下的压力。
    • 16. 发明授权
    • Purification of organic polycarboxylic acids
    • 有机多元羧酸的纯化
    • US5159109A
    • 1992-10-27
    • US657451
    • 1991-02-19
    • Bruce I. RosenDavid A. Peterson
    • Bruce I. RosenDavid A. Peterson
    • C07C51/43C07C51/44
    • C07C51/43C07C51/445
    • There is provided a method for purifying an organic polycarboxylic acid wherein the amounts of organic monofunctional impurities associated therewith are substantially reduced, which method comprises conducting steam distillation of a stream comprising said polycarboxylic acid. In one embodiment of the method, a reactor effluent comprising a polycarboxylic acid is introduced into a crystallization zone, said effluent being subjected to crystallization and steam distillation coextensively in said crystallization zone.The method of the present invention may be used suitably to purify 1,4-cyclohexanedicarboxylic acid in a reactor effluent from the hydrogenation of a terephthalic acid by reducing the amounts of 4-methyl-1-cyclohexanecarboxylic acid and cyclohexanecarboxylic acid, as well as other organic impurities, contaminating the dicarboxylic acid.There is also provided the polycarboxylic acid purified by the method of the present invention.
    • 提供了一种纯化有机多元羧酸的方法,其中与其相关的有机单官能杂质的量显着降低,该方法包括对包含所述多元羧酸的物流进行蒸汽蒸馏。 在该方法的一个实施方案中,将包含多元羧酸的反应器流出物引入结晶区,所述流出物在所述结晶区中共同进行结晶和蒸汽蒸馏。 本发明的方法可以适当地用于通过减少4-甲基-1-环己烷羧酸和环己烷羧酸的量以及其它的方法从对苯二甲酸氢化的反应器流出物中纯化1,4-环己烷二羧酸 有机杂质,污染二羧酸。 还提供了通过本发明的方法纯化的多元羧酸。