News Column

Researchers Submit Patent Application, "End Member for Spiral Separation Membrane Element, Spiral Separation Membrane Element and Separation Membrane...

July 24, 2014



Researchers Submit Patent Application, "End Member for Spiral Separation Membrane Element, Spiral Separation Membrane Element and Separation Membrane Module", for Approval

By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors CHikura, Shinichi (Osaka, JP); Uda, Yasuhiro (Osaka, JP); Hamada, Toshimitsu (Osaka, JP), filed on August 10, 2012, was made available online on July 10, 2014.

The patent's assignee is Nitto Denko Corporation.

News editors obtained the following quote from the background information supplied by the inventors: "Spiral separation membrane elements used for, for example, seawater desalination and ultrapure water production, are conventionally known (see, for example, Patent Literature 1). Generally, in a spiral separation membrane element, a layered body including a separation membrane is wound around a central tube, and end members are disposed on both sides of the layered body. The end members serve, for example, to prevent the layered body from extending telescopically.

"A feed liquid fed to the spiral separation membrane element passes through one of the end members and then is separated into a permeate liquid and a concentrated liquid by the separation membrane. The permeate liquid is discharged through the central tube, and the concentrated liquid is discharged through the other end member.

"The end members have a configuration in which an inner annular portion and an outer annular portion are connected together by a plurality of ribs. The use of twisted shape ribs in these end members have been proposed to form a swirling flow in the feed liquid (see, for example, Patent Literature 2)."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "Technical Problem

"Since the feed liquid sometimes contains suspended solids, these suspended solids may be deposited in the form of scale or biofilm on the separation membrane. The present inventors have found that this phenomenon occurs more frequently in the central region than in the peripheral region. On the other hand, if a swirling flow is formed as described above, it is possible to direct the suspended solids to the peripheral region, and thereby prevent the deposition of the suspended solids from being concentrated in a specific region.

"It is an object of the present invention to provide a novel end member for a spiral separation membrane element capable of preventing deposition of suspended solids from being concentrated in a specific region. It is another object of the present invention to provide a spiral separation membrane element using this end member and a separation membrane module including this spiral separation membrane element.

"Solution to Problem

"In order to solve the above problem, the present invention provides an end member for a spiral separation membrane element, the end member including: an inner annular portion; an outer annular portion surrounding the inner annular portion at a distance from the inner annular portion; a plurality of connecting portions connecting the inner annular portion and the outer annular portion; and a shield plate disposed between at least one pair of the connecting portions and forming an opening between the shield plate and the outer annular portion.

"The present invention also provides a spiral separation membrane element including at least one end member described above.

"The present invention further provides a separation membrane module including: a tubular pressure container; and the spiral separation membrane element described above, the spiral separation membrane element being loaded in the pressure container.

"Advantageous Effects of Invention

"According to the above-described configuration, a radially outwardly spreading flow is formed by the shield plate, and therefore suspended solids in a feed liquid can be effectively directed to the peripheral region. Thereby, the deposition of the suspended solids can be prevented from being concentrated in a specific region.

BRIEF DESCRIPTION OF DRAWINGS

"FIG. 1 is a cross-sectional view of a separation membrane module including spiral separation membrane elements using end members for spiral separation membrane elements according to a first embodiment of the present invention.

"FIG. 2A is a perspective view of a layered body which has not yet been wound around a central tube, and FIG. 2B is a schematic cross-sectional view of the layered body which has been wound around the central tube.

"FIG. 3 is a front view of the end member for a spiral separation membrane element according to the first embodiment.

"FIG. 4 is a cross-sectional view of the end member taken along the IV-IV line in FIG. 3, and is also a diagram illustrating the flow of a feed liquid passing through the end member.

"FIG. 5 is a cross-sectional view of an end member of a modification, and is also a diagram illustrating the flow of a concentrated liquid passing through the end member.

"FIG. 6 is a cross-sectional view of an end member of another modification, and is also a diagram illustrating the flow of a concentrated liquid passing through the end member.

"FIG. 7 is a front view of an end member for a spiral separation membrane element according to a second embodiment of the present invention.

"FIG. 8 is a cross-sectional view of the end member taken along the VIII-VIII line in FIG. 7, and is also a diagram illustrating the flow of a feed liquid passing through the end member.

"FIG. 9 is a diagram illustrating the flow of a concentrated liquid passing through the end member shown in FIG. 7.

"FIG. 10 is a cross-sectional view of an end member of a modification."

For additional information on this patent application, see: CHikura, Shinichi; Uda, Yasuhiro; Hamada, Toshimitsu. End Member for Spiral Separation Membrane Element, Spiral Separation Membrane Element and Separation Membrane Module. Filed August 10, 2012 and posted July 10, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=6796&p=136&f=G&l=50&d=PG01&S1=20140703.PD.&OS=PD/20140703&RS=PD/20140703

Keywords for this news article include: Nitto Denko Corporation.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Politics & Government Week


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters