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    • 96. 发明申请
    • IMPROVED ACRYLONITRILE RECOVERY PROCESS
    • 改进的丙烯腈回收方法
    • WO00059871A1
    • 2000-10-12
    • PCT/US2000/006732
    • 2000-03-15
    • C07C253/34C07C255/08
    • C07C253/34C07C255/08
    • The process of the present invention comprises transporting a reactor effluent containing acrylonitrile/methacrylonitrile to a first column (quench) where the reactor effluent is cooled with a first aqueous stream, transporting the cooled effluent into an indirect contact cooler to condensed at least some of the cooled effluent to form a condensate comprising water and acrylonitrile/methacrylonitrile, transporting the remaining cooled gaseous effluent containing acrylonitrile/methacrylonitrile into a second column (absorber) where the cooled effluent is contacted with a second aqueous stream to absorb substantially all of the remaining acrylonitrile/methacrylonitrile into the second aqueous stream, transporting the second aqueous stream containing the acrylonitrile/methacrylonitrile to a first distillation column (recovery column) for separation of the crude acrylonitrile/methacrylonitrile from the second aqueous stream, and transporting the separated crude acrylonitrile/methacrylonitrile to a second distillation column (heads column) to remove at least some impurities from the crude acrylonitrile/methacrylonitrile, and transporting the partially purified acrylonitrile/methacrylonitrile, to a third distillation column (product column) to further purify the acrylonitrile/methacrylonitrile, and recovering the purified acrylonitrile/methacrylonitrile, wherein the improvement comprises transporting the condensate formed in the indirect contact cooler to a decanter where the condensate is separated into an organic phase comprising acrylonitrile/methacrylonitrile, an aqueous phase and a vapor phase, and the organic phase is introduced into the recovery column without passing through the absorber column.
    • 本发明的方法包括将含有丙烯腈/甲基丙烯腈的反应器流出物输送到第一塔(骤冷),其中反应器流出物用第一含水流冷却,将冷却的流出物输送到间接接触冷却器中以冷凝至少一些 将含有丙烯腈/甲基丙烯腈的剩余的冷却的气态流出物输送到第二塔(吸收器)中,其中冷却的流出物与第二含水流接触以吸收基本上所有剩余的丙烯腈/ 甲基丙烯腈转移到第二含水流中,将含有丙烯腈/甲基丙烯腈的第二含水流输送到第一蒸馏塔(回收塔),以从第二含水流中分离粗丙烯腈/甲基丙烯腈,并将分离的粗丙烯腈/甲基丙烯腈 向第二蒸馏塔(头柱)除去粗丙烯腈/甲基丙烯腈中的至少一些杂质,并将部分纯化的丙烯腈/甲基丙烯腈输送到第三蒸馏塔(产物柱)以进一步纯化丙烯腈/甲基丙烯腈,以及 回收纯化的丙烯腈/甲基丙烯腈,其中改进包括将在间接接触冷却器中形成的冷凝物输送到滗析器,其中冷凝物被分离成包含丙烯腈/甲基丙烯腈,水相和气相的有机相,有机相为 引入回收塔而不通过吸收塔。
    • 98. 发明申请
    • METHOD OF QUENCHING GASEOUS ACRYLONITRILE AND HYDROGEN CYANIDE PRODUCT STREAM
    • 气相丙烯腈和氢化氰化物产品流程的方法
    • WO00018728A1
    • 2000-04-06
    • PCT/US1999/022484
    • 1999-09-28
    • B01J10/00C07C253/24C07C253/34C07C255/08
    • C07C253/26C07C253/34C07C255/08
    • The present invention provides an improvement in a process and apparatus for manufacturing acrylonitrile by the vapor phase ammoxidation of a hydrocarbon. The invention comprises contacting the gaseous product stream with a quench fluid in a reverse jet scrubber. The quenching fluid is injected counter-current to the gas flow, and the gas velocity is sufficient to reverse the flow direction of the water, thereby forming a standing wave or froth zone wherein the quench is rapidly achieved. The quench fluid may be obtained from many sources, but is preferably obtained from a waste process stream emanating from a subsequent recovery or purification step. The quench fluid may contain acid to facilitate removal of ammonia from the gas stream. The quench fluid that is not vaporized may be recirculated. Impurities and contaminants may be removed from the quench fluid prior to recycle. In a most preferred embodiment, the quench fluid is not cooled during recirculation, and the cooling process is essentially adiabatic, with the sensible heat of the hot gaseous stream being converted to latent heat in the form of vapor.
    • 本发明提供了通过烃的气相氨氧化制备丙烯腈的方法和装置的改进。 本发明包括使气态产物流与反向喷射洗涤器中的骤冷流体接触。 淬火流体与气流逆流注入,气体流速足以反转水的流动方向,从而形成驻波或泡沫区,其中快速实现骤冷。 骤冷流体可以从许多来源获得,但优选地从随后的回收或纯化步骤发出的废物流中获得。 骤冷流体可含有酸,以便于从气流中除去氨。 未蒸发的骤冷液体可以再循环。 杂质和污染物可以在循环之前从骤冷流体中除去。 在最优选的实施方案中,骤冷流体在再循环过程中不被冷却,并且冷却过程基本上是绝热的,热气流的显热转化为蒸气形式的潜热。