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公开(公告)号：US4828705A
公开(公告)日：1989-05-09
申请号：US925347
申请日：1986-10-31
IPC分类号： A61K9/28 , B01D61/14 , B01D61/18 , B01D61/22 , B01D63/00 , B01D65/02 , B01D65/08 , B01D69/02 , B01D69/12
CPC分类号： B01D61/142 , A61K9/284 , B01D69/02 , B01D69/12
摘要： Pressure-dependent anisotropic behavior is provided by a size selective separation membrane system having two successive porous layers. The first layer is a soft, elastic, effectively porous material, and the second layer is a substantially rigid porous material. When positive pressure presses the first layer against the second layer, the second layer serves as a rigid support, and the first layer is compressed to reduce its effective pore size. The first layer material is characterized by sufficient compressibility, that, when a pressure differential of 100 psi is applied across the thickness of the system, the effective flow rate is reduced by a factor of at least 20 compared to the flow rate when 100 psi is exerted in the opposite direction. A substance can be separated from a liquid mixture using the membrane system by: positioning the second layer of the membrane system in contact with the mixture; exerting pressure on the mixture to force liquid with the substance first through the pores of the rigid layer and the soft layer of the system; and reversing the flow through the membrane system by exerting pressure on the resulting filtrate, in a manner to compress the soft material sufficiently to reduce the pore size to prevent passage of the substance. The membrane system is manufactured by coagulating the layers from polymers in solution.
摘要翻译： 压力依赖的各向异性行为由具有两个连续多孔层的尺寸选择性分离膜系统提供。 第一层是柔软的，弹性的，有效的多孔材料，第二层是基本刚性的多孔材料。 当正压力将第一层压在第二层上时，第二层用作刚性支撑体，并且第一层被压缩以减小其有效孔径。 第一层材料的特征在于具有足够的压缩性，当在整个系统的厚度上施加100psi的压力差时，当100psi为100psi时，与流速相比，有效流速降低至少20倍 施加在相反的方向。 可以使用膜系统将物质与液体混合物分离，方法是将膜系统的第二层与混合物接触; 对混合物施加压力以迫使液体与物质首先通过刚体层和系统的软层的孔; 并通过对所得滤液施加压力来反转通过膜系统的流动，以充分压缩软材料以减小孔径以防止物质通过。 膜系统通过从溶液中的聚合物凝结层来制造。
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