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    • 73. 发明授权
    • Ethyl acetate production
    • 乙酸乙酯生产
    • US08562921B2
    • 2013-10-22
    • US13422743
    • 2012-03-16
    • Sagar B. Gadewar
    • Sagar B. Gadewar
    • B01J8/04B01D3/00C07C67/54
    • C07C67/40B01D3/001B01D3/009Y02P20/127C07C69/14
    • A process for the production of high purity ethyl acetate from ethanol is described. The process involves reacting ethanol over a suitable catalyst in a reactive distillation column. The reactive distillation setup allows overcoming the reaction equilibrium for increased conversion of ethanol. Hydrogen is removed as the distillate and ethyl acetate is obtained as a bottoms product from the reactive distillation column. A feed of hydrogen at the bottom of the column and a suitable hydrogenation catalyst placed at the bottom of the column allows for a significant reduction of impurities such as butan-2-one and/or n-butyraldehyde in the ethyl acetate product. Adding side reactors to the reactive distillation column allows additional catalyst holdup for improved reactant conversion.
    • 描述了从乙醇生产高纯度乙酸乙酯的方法。 该方法包括在反应性蒸馏塔中使合适的催化剂上的乙醇反应。 反应蒸馏装置允许克服用于提高乙醇转化率的反应平衡。 作为馏出物除去氢气,并从反应蒸馏塔作为塔底产物获得乙酸乙酯。 在塔底部的氢气进料和位于塔底部的合适的氢化催化剂允许显着降低乙酸乙酯产物中杂质如丁-2-酮和/或正丁醛。 将反应器加入反应蒸馏塔允许额外的催化剂保留以改善反应物转化率。
    • 79. 发明申请
    • Flourination of dicarbonyl compounds
    • 二羰基化合物的泛化
    • US20050256332A1
    • 2005-11-17
    • US10505083
    • 2003-02-19
    • John Moilliet
    • John Moilliet
    • C07C67/307C07C20060101C07C45/63C07C49/167C07C51/363C07C67/54C07C69/003C07C69/66C07C69/716C07C253/30C07C25/39
    • C07C67/307C07C69/716
    • The invention provides a method for the preparation of a dicarbonyl compound of formula (I) R1COCFR2COR3 wherein R1 is selected from alkyl, substituted alkyl, cycloalkyl, aryl, substituted aryl and acetoxy, R2 is selected from hydrogen, halogen, nitro, cyano, alkyl, substituted alkyl, cycloalkyl, acetoxy, aryl and substituted aryl, and R3 is selected from alkyl, substituted alkyl, oxyalkyl and substituted oxyalkyl, the method comprising treating a dicarbonyl compound of formula (II) R1COCHR2COR3 with elemental fluorine in a solvent which consists of methanol or aqueous methanol. The method provides an inexpensive and convenient synthetic route to 2-fluoro- and 2,2-difluoro-1,3-diketones and -1,3-ketoesters.
    • 本发明提供一种制备式(I)的二羰基化合物的方法,其中R 1,R 2,R c, 选自烷基,取代的烷基,环烷基,芳基,取代的芳基和乙酰氧基,R 2选自氢,卤素,硝基,氰基,烷基,取代的烷基,环烷基,乙酰氧基, 芳基和取代的芳基,R 3选自烷基,取代的烷基,烷氧基和取代的烷氧基,该方法包括处理式(II)的二羰基化合物R 1 COCHR 在由甲醇或甲醇水溶液组成的溶剂中,使用元素氟。 该方法为2-氟-2,2-二氟-1,3-二酮和-1,3-酮酯提供了便宜且方便的合成途径。