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    Process for the recovery of terephthalic acid and ethylene glycol from poly(ethylene terephthalate)
    1.
    发明授权
    Process for the recovery of terephthalic acid and ethylene glycol from poly(ethylene terephthalate) 失效
    从聚对苯二甲酸乙二醇酯回收对苯二甲酸和乙二醇的方法

    公开(公告)号：US5413681A

    公开(公告)日：1995-05-09

    申请号：US151637

    申请日：1993-11-15

    申请人： Gerald C. Tustin ,  Thomas M. Pell, Jr. ,  David A. Jenkins ,  Mary T. Jernigan

    发明人： Gerald C. Tustin ,  Thomas M. Pell, Jr. ,  David A. Jenkins ,  Mary T. Jernigan

    IPC分类号： B01D3/00 ,  B01D3/14 ,  C07C51/09

    CPC分类号： C07C51/09 ,  B01D3/009 ,  B01D3/146 ,  C08J11/14 ,  C08J2367/02 ,  Y02P20/127 ,  Y02W30/704 ,  Y10S203/13 ,  Y10S203/17

    摘要： A process useful for the recovery of terephthalic acid and ethylene glycol from poly(ethylene terephthalate) or its copolymers. The process is economical, beneficial to the environment and provides polymer grade terephthalic acid and ethylene glycol from post-consumer resin. The process is a six-step process including: (1) contacting a resin containing poly(ethylene terephthalate) with water at elevated temperature and pressure, (2) cooling the resulting mixture to provide a solid portion containing terephthalic acid and a liquid portion containing ethylene glycol, (3) recovery of the ethylene glycol from the liquid portion by distillation, (4) recovery of the terephthalic acid by heating the solid portion in the presence of water vapor at elevated temperature to produce a vapor containing terephthalic acid and water, (5) cooling terephthalic acid water vapor mixture to a temperature below the dew point of terephthalic acid and (6) collecting the polymer grade terephthalic acid. The polymer grade terephthalic acid and ethylene glycol provided by this process can be used to make high quality terephthalate homopolymers or copolymers for applications including clear bottles and fibers.

    摘要翻译： 用于从聚对苯二甲酸乙二醇酯或其共聚物中回收对苯二甲酸和乙二醇的方法。 该方法是经济的，有利于环境，并提供来自消费后树脂的聚合物级对苯二甲酸和乙二醇。 该方法是六步法，其包括：（1）在升高的温度和压力下使包含聚对苯二甲酸乙二醇酯的树脂与水接触，（2）冷却所得混合物以提供含有对苯二甲酸的固体部分和含有 乙二醇，（3）通过蒸馏从液体部分回收乙二醇，（4）通过在水蒸汽存在下在高温下加热固体部分来回收对苯二甲酸，以产生含有对苯二甲酸和水的蒸汽， （5）将对苯二甲酸水蒸气混合物冷却至低于对苯二甲酸露点的温度，和（6）收集聚合物级对苯二甲酸。 通过该方法提供的聚合物级对苯二甲酸和乙二醇可用于制备用于包括透明瓶和纤维的应用的高质量对苯二甲酸酯均聚物或共聚物。

    Method for producing acetaldehyde from acetic acid
    2.
    发明授权
    Method for producing acetaldehyde from acetic acid 失效
    乙酸生产乙醛的方法

    公开(公告)号：US6121498A

    公开(公告)日：2000-09-19

    申请号：US69953

    申请日：1998-04-30

    申请人： Gerald C. Tustin ,  Leslie S. Depew ,  Nick A. Collins

    发明人： Gerald C. Tustin ,  Leslie S. Depew ,  Nick A. Collins

    IPC分类号： B01J23/89 ,  C07B61/00 ,  C07C45/41 ,  C07C45/84 ,  C07C47/06 ,  C07C47/00 ,  B01J23/00 ,  B01J23/42 ,  C07C45/00

    CPC分类号： B01J23/8906 ,  C07C45/41 ,  Y02P20/582

    摘要： A method of producing acetaldehyde hydrogenates acetic acid in the presence of an iron oxide catalyst containing between 2.5 and 90 wt % Pd, more preferably 10 and 80 wt % Pd and most preferably 20 and 60 wt % Pd. The catalyst has a specific surface area of less than 150 m.sup.2 /g. Hydrogen and acetic acid are fed to a reactor in a hydrogen to acetic acid ratio of 2:1 to 25:1, more preferably in a hydrogen to acetic acid ratio of 3:1 to 15:1 and most preferably in a hydrogen to acetic acid ratio of 4:1 to 12:1. The hydrogenation is performed at a temperature of about 250.degree. C. to 400.degree. C., more preferably about 270.degree. C. to 350.degree. C. and most preferably about 280.degree. C. to 325.degree. C. The hydrogenation of acetic acid produces a partially gaseous product, and acetaldehyde is absorbed from the partially gaseous product with a solvent containing acetic acid. The gas remaining after the absorption step contains hydrogen, and this gas is recycled for the hydrogenation of acetic acid. The absorbed acetaldehyde is distilled to isolate same. After acetaldehyde is isolated from unreacted acetic acid and the other products via distillation, the unreacted acetic acid is separated from the other products using azeotropic distillation. Water is contained in the other products, and the azeotrope is an azeotrope of ethyl acetate and water. The unreacted acetic acid is separated in a column, and the column is controlled to contain an ethyl acetate rich azeotrope of ethyl acetate and water.

    摘要翻译： 在含有2.5-90wt％Pd，更优选10和80wt％Pd，最优选20-60wt％Pd的氧化铁催化剂存在下，乙醛的制备方法使乙酸氢化。 催化剂的比表面积小于150m2 / g。 将氢和乙酸以2:1至25:1的氢气与乙酸的比例加入到反应器中，更优选以3:1至15:1的氢气至乙酸比例加入，最优选在氢气至乙酸 酸比为4：1至12：1。 氢化在约250℃至400℃，更优选约270℃至350℃，最优选约280℃至325℃的温度下进行。乙酸的氢化产生 部分气态产物，并且乙醛由含有乙酸的溶剂从部分气态产物中吸收。 吸收步骤后残留的气体含有氢气，该气体被再循环用于乙酸的氢化。 将吸收的乙醛蒸馏除去。 通过蒸馏从未反应的乙酸和其它产物中分离乙醛后，使用共沸蒸馏将未反应的乙酸与其它产物分离。 其他产物中含有水，共沸物是乙酸乙酯和水的共沸物。 将未反应的乙酸在柱中分离，并将柱控制为含有乙酸乙酯和水的乙酸乙酯富共沸物。