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    • 4. 发明申请
    • CONTAMINANT MITIGATION IN PSA AIR FRACTIONATION
    • PSA空气分离中的污染物减少
    • WO2011123210A1
    • 2011-10-06
    • PCT/US2011/026799
    • 2011-03-02
    • WEARAIR OXYGEN, INC.KNAEBEL, Seth, Pemberton
    • KNAEBEL, Seth, Pemberton
    • B01D53/04
    • B01D53/047B01D53/02B01D2253/108B01D2256/12B01D2257/102B01D2257/80B01D2259/40001B01D2259/40062B01D2259/40066B01D2259/402B01D2259/4148
    • Disclosed is a method for subjecting feed air to fractionation for recovery of a product oxygen fraction therefrom in a pressure swing adsorption (PSA) process utilizing a nitrogen-selective adsorbent ("NSA") that is sensitive to water. The PSA process includes the steps of feed pressurization, production, equalization, and blowdown. The improvement to this PSA process commences with placing a bed of pre-treatment adsorbent between feed air and a bed of NSA. Next, a controllable valve is interposed between the pre-treatment adsorbent bed and the NSA bed. Finally, the controllable valve is kept closed during the steps of production, equalization, and when the process is idle. An advantageous NSA is LiX zeolite, Li- LSX zeolite, CaX zeolite, and similar adsorbents, particularly highly hydrophilic zeolites. Another feature of the disclosed PSA cycle is that the pre-treatment adsorbent bed blows-down while the NSA bed equalizes.
    • 公开了一种使用对水敏感的氮选择性吸附剂(“NSA”)的变压吸附(PSA)方法对进料空气进行分馏以从其中回收产物氧馏分的方法。 PSA方法包括进料加压,生产,均衡和排污的步骤。 PSA过程的改进开始于在进料空气和NSA床之间放置预处理吸附剂床。 接下来,在预处理吸附床和NSA床之间插入可控阀。 最后,可控阀在生产步骤,均衡阶段以及过程空闲时保持关闭。 有利的NSA是LiX沸石,Li-LSX沸石,CaX沸石和类似的吸附剂,特别是高度亲水的沸石。 所公开的PSA循环的另一个特征是在NSA床平衡的同时,预处理吸附剂床吹扫。
    • 7. 发明申请
    • REGENERATIVE ADSORPTION GAS DRYER
    • 再生吸附式气体干燥机
    • WO2009047530A1
    • 2009-04-16
    • PCT/GB2008/003452
    • 2008-10-13
    • WALKER FILTRATION LIMITEDWALKER, BrianCARNEY, Peter
    • WALKER, BrianCARNEY, Peter
    • B01D53/26B01D53/04
    • B01D53/261B01D2259/40001B01D2259/40003B01D2259/40086
    • A regenerative adsorption gas dryer having a wet gas inlet, first and second drying towers, and a dried gas outlet, the inlet, towers and outlet being arranged such that, in use, a flow of purge gas regenerates an off-stream one of the towers, while a stream of wet gas from the wet gas inlet enters an on-stream one of the towers to exit that tower as a stream of dried gas which then continues to the dried gas outlet, the roles of the off -stream and on-stream towers being reversible, -wherein the dryer further has:a first check valve (20) for controlling a stream of dried gas between the first drying tower and the dried gas outlet, and a second check valve (20) for controlling a stream of dried gas between the second drying tower and the dried gas outlet, he first and second check valves being arranged such that the pressure of the stream of dried gas exiting the on-stream tower opens the check valve of that tower to allow the stream of dried gas to continue to the dried gas outlet, and such that the pressure of the stream of dried gas from the on-stream tower closes the check valve of the off-stream tower; and a first by-pass (28) to the first check valve and a second by-pass (28) to the second check valve, each by-pass allowing a restricted flow of gas to be extracted from the stream of dried gas from the on-stream tower to form the flow of purge gas for the off -stream tower. Each check valve may have a valve body (24) which moves relative to a valve seat (22) to open and close the valve, the respective by-pass being formed as a gas passage through the valve body.
    • 具有湿气入口,第一和第二干燥塔以及干燥气体出口的再生吸附式气体干燥器,所述入口,塔和出口被布置成使得在使用中,净化气体流将再生一个 塔,而来自湿气入口的湿气流进入入流塔之一,作为干燥气体流离开该塔,然后干燥的气体继续到干燥的气体出口,外流和上 - 流塔是可逆的, - 其中所述干燥器还具有:第一止回阀(20),用于控制所述第一干燥塔和所述干燥气体出口之间的干燥气体流;以及第二止回阀(20),用于控制流 在第二干燥塔和干燥的气体出口之间的干燥气体的第一和第二止回阀被布置成使得离开流动塔的干燥气体流的压力打开该塔的止回阀, 干燥的气体继续干燥的气体出口,a d,使得来自塔上的干燥气体流的压力关闭了脱水塔的止回阀; 以及第一旁路(28)到第一止回阀和第二旁路(28)到第二止回阀,每个旁路允许从干燥气体流中提取有限的气体流, 在流塔上形成用于离岸塔的吹扫气体流。 每个止回阀可以具有相对于阀座(22)移动以打开和关闭阀的阀体(24),相应的旁路形成为通过阀体的气体通道。