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    • 2. 发明授权
    • Process for the separation of nitrotoluene isomers
    • 硝基甲苯异构体分离方法
    • US4270013A
    • 1981-05-26
    • US86489
    • 1979-10-19
    • James W. PriegnitzArthur M. Landis
    • James W. PriegnitzArthur M. Landis
    • C07C201/16C07C79/10
    • C07C201/16B01D17/0202
    • An adsorptive separation process for separating ortho or para-nitrotoluene from a feed mixture comprising the isomer to be separated and at least one other isomer of nitrotoluene, or for separating ortho and para-nitrotoluene from a mixture of all three isomers of nitrotoluene, which process comprises contacting the feed mixture with an adsorbent comprising a type X or type Y zeolite, whichever is appropriate, containing at the exchangeable cationic sites the appropriate cations, selectively adsorbing substantially all of the nitrotoluene to be separated to the substantial exclusion of the remaining isomers and thereafter recovering high-purity ortho, para or ortho and para isomers. A desorption step may be used to desorb the adsorbed isomers.
    • 用于从包含待分离异构体和硝基甲苯的至少一种其它异构体的进料混合物中分离邻位或对硝基甲苯的吸附分离方法,或用于从硝基甲苯的所有三种异构体的混合物中分离邻位和对硝基甲苯,该方法 包括使进料混合物与包含X型或Y型沸石的吸附剂接触,所述吸附剂在适当的可交换阳离子位置处含有适当的阳离子,选择性吸附待分离的所有硝基甲苯以基本排除剩余的异构体, 然后回收高纯度的邻位,对位或邻位和对位异构体。 解吸步骤可用于解吸所吸附的异构体。
    • 5. 发明授权
    • Simulated countercurrent sorption process employing ion exchange resins
with backflushing
    • 使用离子交换树脂进行反吹的模拟逆流吸附方法
    • US4293346A
    • 1981-10-06
    • US91303
    • 1979-11-05
    • Arthur M. LandisDonald B. BroughtonR. Gene Fickel
    • Arthur M. LandisDonald B. BroughtonR. Gene Fickel
    • B01D15/18B01D53/04B01J47/02C13B20/14C13K13/00C13D3/14
    • B01D53/08B01D15/1835B01D53/0423B01J47/026C13B20/148C13K13/007B01D2253/206
    • A process for separating a selected component from a fluid mixture of components by employment of an ion exchange resin. Fluid flow is maintained through a column containing the adsorbent in at least three separation zones, an adsorption zone in which the selected component is adsorbed by the adsorbent, a purification zone and a desorption zone from which the selected component is displaced by a desorbent material. There is also a backflushing zone, upstream of either the feed or desorbent stream inlets, in which the direction of fluid flow is opposite the direction of flow through the three separation zones. The zones are periodically shifted through the column by advancing the input and output streams. The backflushing serves to decrease the density of the resin bed thereby controlling the pressure drop developed through that bed when it is in service as part of a separation zone. The ion exchange resin particularly suitable for the invention is an alkali metal salt of a nuclearly sulfonated styrene-cation exchange resin containing a cross-linking agent. The process of the invention is particularly suitable for the separation of a saccharide from an aqueous solution of saccharides.
    • 一种通过使用离子交换树脂将选定组分与组分的流体混合物分离的方法。 通过在至少三个分离区域中含有吸附剂的柱保持流体流动,其中所选择的组分被吸附剂吸附的吸附区域,净化区域和解吸区域,所选择的组分由解吸剂材料从其中移位。 在进料或解吸剂流入口的上游还有一个反冲洗区,其中流体流动的方向与通过三个分离区的流动方向相反。 通过推进输入和输出流,区域周期性地移动通过列。 反吹用于降低树脂床的密度,从而控制当其作为分离区的一部分使用时通过该床形成的压降。 特别适用于本发明的离子交换树脂是含有交联剂的核磺化苯乙烯 - 阳离子交换树脂的碱金属盐。 本发明的方法特别适用于从糖水溶液中分离糖类。