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Process for using a cross-flow filter membrane to remove particles from a liquid stream

A liquid flow, particle technology, applied in the field of removing particles from liquid flow using cross-flow filtration membranes, which can solve the problems of membrane degradation, impossibility to remove blocking substances, etc.

Inactive Publication Date: 2015-12-23
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cleaning cycle may not remove all clogging material and may result in membrane degradation

Method used

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  • Process for using a cross-flow filter membrane to remove particles from a liquid stream
  • Process for using a cross-flow filter membrane to remove particles from a liquid stream
  • Process for using a cross-flow filter membrane to remove particles from a liquid stream

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example

[0068] experiment method

[0069] Measured according to ASTM Designation E1294-89, "Standard Test Method for PoreSize Characteristics of Membrane Filters Using Automated Liquid Porosimeter" mean flow pore size and the maximum aperture ( bubble point ), measured using the automated bubble point method from ASTM Standard No. F316 using a Capillary Flow Porometer (Model CFP-34RTF8A-3-6-L4, Porous Materials, Inc. (PMI), Ithaca, NY) approximately Pore ​​characteristics of membranes with pore diameters from 0.05 μm to 300 μm. Each sample (8, 20 or 30 mm diameter) was wetted with a low surface tension fluid (1,1,2,3,3,3-hexafluoropropene or "Galwick", which has a surface tension of 16 dynes / cm) . Each sample was placed in a holder, and a differential air pressure was applied and fluid was removed from the sample. The mean flow pore size was calculated using the supplied software using the differential pressure at which the wet flow is equal to half the dry flow (the flow with...

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Abstract

A process is provided for separating particles from a liquid stream by a crossflow mechanism. The liquid stream is passed tangentially across a membrane, where the membrane comprises an active layer that has a fibrous structure in the form of a nonwoven, and the nonwoven has i) a mean flow pore size of 0.03 to 1.7 microns, ii) a maximum pore size of 3.1 microns, and an active layer having a mean thickness of less than 300 microns.

Description

technical field [0001] The present invention relates to a method of removing particles from a liquid stream using a cross-flow filtration membrane. Background technique [0002] Cross-flow (or tangential-flow) filtration requires that the liquid to be filtered (eg suspension, dispersion or solution) span tangentially across one side of the membrane. Typically applied pressure is used to force a portion of the liquid across the membrane to the filtrate or downstream side of the membrane. As in traditional "normal flow" or "dead end" filtration methods, particles that are too large to pass through the membrane are trapped on the feed or upstream side of the membrane. However, unlike normal flow filtration, these particles are swept aside by the tangential flow so that there is no "accumulation" of particles on the membrane. Membranes for cross-flow filtration are usually non-fibrous, porous membranes made of plastic or ceramic or of glass or metal. These membranes generally...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/64B01D71/68B01D69/02
CPCB01D69/02B01D71/64B01D71/68B01D2323/39B01D2325/04A61M2202/0413A61M2205/75B01D2325/0283B01D67/00042
Inventor S.弗里斯克R.克里斯坦森
Owner EI DU PONT DE NEMOURS & CO