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    • 2. 发明授权
    • Synthesis of cyclic ethers
    • 环醚的合成
    • US4866188A
    • 1989-09-12
    • US637370
    • 1984-08-03
    • John A. Scheben
    • John A. Scheben
    • C07D307/08C07D313/04
    • C07D313/04C07D307/08
    • A process is disclosed for preparing a cyclic ether which comprises cyclodehydrating a polyhydroxy compound of the general formulaHOR.sup.1 HC--R.sup.2 --CHR.sup.3 OHin which R.sup.1 and R.sup.3, each of which is the same or different, is hydrogen or a lower aliphatic, cycloaliphatic or aryl group and R.sup.2 is a divalent aliphatic group of 1 to 10 carbon atoms containing 0, 1 or 2 etheric oxygen atoms or 0, 1 or 2 secondary or tertiary amine nitrogen atoms and 0, 1 or more lower aliphatic, cycloaliphatic and/or aryl groups containing 0 or 1 hydroxyl groups at elevated temperatures in the presence of a catalytically effective amount of a Group VIII metal catalyst or a Group VIII metal-containing material to provide a cyclic ether of the general formula ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 are as defined above. The process is especially useful for preparing the commercially important cyclic ethers tetrahydrofuran and 1,4-dioxane which are derived from 1,4-butanediol and ethylene glycol and/or diethylene glycol, respectively.
    • 公开了一种制备环醚的方法,该方法包括将通式为HOR1HC-R2-CHR3OH的多羟基化合物环化脱水,其中R 1和R 3各自相同或不同,为氢或低级脂族,脂环族或芳基 并且R 2是含有0,1或2个醚性氧原子或0,1或2个仲胺或叔胺氮原子和0,1或更多个低级脂族,脂环族和/或芳基的含1至10个碳原子的二价脂族基团, 0或1个羟基,在催化有效量的第VIII族金属催化剂或含Ⅷ族金属的物质存在下,在高温下提供通式为“IMAGE”的环醚,其中R 1,R 2和R 3为 如上所述。 该方法特别可用于制备分别衍生自1,4-丁二醇和乙二醇和/或二甘醇的商业上重要的环醚四氢呋喃和1,4-二恶烷。
    • 6. 发明授权
    • Ozonator power supply employing a current source inverter
    • 使用电流源逆变器的臭氧发生器电源
    • US4752866A
    • 1988-06-21
    • US12983
    • 1987-02-10
    • Anh N. HuynhPhoivos D. Ziogas
    • Anh N. HuynhPhoivos D. Ziogas
    • H02M3/156H02M5/45H02M7/521
    • H02M5/45H02M3/1563
    • A versatile current source inverter power supply for an ozonator in which a gating control circuit controls the gating of a thyristor bridge inverter power supply in a manner in which the output current to the ozonator is controlled and regulated. The current source inverter power supply circuit includes a DC/AC thyristor bridge inverter circuit coupled at its input terminals to a direct current power source and at its output terminals to an electrical network which includes the capacitative ozonator load. The thyristor bridge inverter includes a first pair of thyristors and diodes coupled to conduct current in a first direction through the electrical network, and a second pair of thyristors and diodes coupled to conduct current in a second, opposite direction through the electrical network. The electrical network includes a step up high voltage transformer, with its primary winding coupled to the thyristor bridge inverter and its secondary winding coupled to the ozonator load. First and second commutating capacitors are connected across the first and second pairs of thyristors for commutating off the thyristors. An adjustable current pulse amplitude conrol circuit is provided for controlling the amplitude of current pulses supplied through the thyristor bridge to the ozonator load.
    • 一种用于臭氧发生器的通用电流源逆变器电源,其中门控控制电路以控制和调节对臭氧发生器的输出电流的方式控制晶闸管桥式逆变器电源的选通。 电流源逆变器电源电路包括DC / AC晶闸管桥式逆变器电路,其在其输入端耦合到直流电源,并在其输出端耦合到包括电容臭氧发生器负载的电网。 晶闸管桥式逆变器包括第一对晶闸管和二极管,其耦合以通过电网在第一方向上传导电流,以及第二对晶闸管和二极管,其耦合以通过电网在第二相反方向传导电流。 电网包括升压高压变压器,其初级绕组耦合到晶闸管桥式逆变器及其与臭氧发生器负载耦合的次级绕组。 第一和第二换向电容器跨越第一和第二对晶闸管连接,用于使晶闸管换向。 提供可调电流脉冲幅度控制电路,用于控制通过晶闸管桥供给到臭氧发生器负载的电流脉冲的幅度。