EP1551616A1 - Materiau de prefiltration - Google Patents

Materiau de prefiltration

Info

Publication number
EP1551616A1
EP1551616A1 EP03772215A EP03772215A EP1551616A1 EP 1551616 A1 EP1551616 A1 EP 1551616A1 EP 03772215 A EP03772215 A EP 03772215A EP 03772215 A EP03772215 A EP 03772215A EP 1551616 A1 EP1551616 A1 EP 1551616A1
Authority
EP
European Patent Office
Prior art keywords
plastic
granules
molded body
bed
bulk density
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03772215A
Other languages
German (de)
English (en)
Inventor
Antonio Giangrasso
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pfleiderer Water Systems GmbH
Original Assignee
Pfleiderer Water Systems GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE20215896U external-priority patent/DE20215896U1/de
Priority claimed from DE10248201A external-priority patent/DE10248201B4/de
Application filed by Pfleiderer Water Systems GmbH filed Critical Pfleiderer Water Systems GmbH
Publication of EP1551616A1 publication Critical patent/EP1551616A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1638—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate
    • B01D39/1653—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate of synthetic origin
    • B01D39/1661—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate of synthetic origin sintered or bonded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]

Definitions

  • the invention relates to a molded body made of plastic, a process for its production and its use in the form of a bed as a pre-filter material.
  • Pre-filters are usually used to filter out coarse-grained particles such as dirt particles from a solution before it is further cleaned by downstream, finer filters.
  • the use of pre-filters is necessary in order to avoid that the fine filters are clogged by coarse particles and thus their filter performance is impaired.
  • Sand, split, lava rock and ceramic tubes are often used as pre-filter materials.
  • the filter properties of these materials are created by using them as fillings.
  • the use of sand, split and lava rock is often disadvantageous because these materials have a low filter efficiency in relation to their weight.
  • sand and split are difficult to clean due to the relatively small particles that make up the bed.
  • Ceramic tubes also have the disadvantage that ceramic particles can become detached from the tubes during filtration, which leads to undesirable contamination of the filtrate.
  • cotton wool As a pre-filter material to filter out coarse dirt particles from a solution.
  • cotton wool has the disadvantage that it is relatively easily clogged and is difficult to clean.
  • the object underlying the invention is to provide a pre-filter material with a low weight that is easy to clean, a low one Pressure loss and even with a low bed height has a high efficiency during the filtration.
  • a molded plastic body which comprises irregularly sintered plastic granules with a density of 0.6 to 1.2 g / cm 3 and a bulk density in the range from 150 to 250 g / 1.
  • Plastic moldings of this type can be used as advantageous prefilters in the form of a bed.
  • the plastic molded body according to the invention which can be used as a prefilter material in the form of a bed
  • the plastic is irregularly filled into a sintered mold in the form of a coarse-grained granulate and heated therein to a temperature which is so high that the plastic granulate melts on the surface , but not completely melted.
  • the plastic granulate is sintered together at the contact surfaces and after cooling, a stable sintered composite is obtained, i.e. the plastic molded body according to the invention.
  • the plastic that is used in the form of coarse-grained granules can be any commercially available plastic that has a density of 0.6 to 1.2 g / cm 3 , preferably 0.8 to 1.0 g / cm 3 , and as Granules are available. Polyethylene or polypropylene are preferably used. It is also conceivable that a mixture of different plastics is used, although care must be taken here that the granulate surfaces should have similar melting temperatures.
  • the granules preferably have a Vicat softening temperature in the range from 60 to 100 ° C., particularly preferably 70 to 90 ° C.
  • a plastic with a Vicat softening temperature in the range given above usually has a melting temperature in the range between 80 and 220 ° C, which for the production of the plastic moldings according to the invention is particularly suitable.
  • the plastic granules can have any shape and are * preferably platelet, cylindrical, spherical, or lenticular, particularly preferably platelet or lenticular. It is preferred that the granules have an average size in the range from 2 mm to 10 mm, particularly preferably 4 mm to 7 mm. In the case of spherical or lenticular granules, "average size" means the diameter.
  • the platelet-shaped granules can be round, oval, ellipsoidal or irregular. By “average size” is meant the largest diameter of the platelet-shaped granules.
  • the thickness of the platelets is preferably 0.05 to 2.5 mm.
  • the molded plastic article according to the invention also has a bulk density in the range from 150 to 250 g / 1, preferably in the range from 150 to 200 g / 1.
  • the bulk density is a measure of the irregularity with which the granules are sintered together. The more irregular the granules are in the plastic molding and the smaller the melted contact surfaces of the granules, the lower the bulk density. Furthermore, the bulk density depends on the size of the granules used, ie the smaller the granules used, the greater the bulk density of the shaped body made from the granules.
  • the plastic molded article according to this invention can have any size and shape. It preferably has a plate-like shape, the surface of the plate being round. The diameter of the plate is preferably in the range from 1 to 10 cm, particularly preferably 2 to 6 cm. The thickness of the plate is preferably in the range from 0.5 to 2 cm.
  • the plastic molded body according to the invention preferably has a specific surface area in the range from 15 to 80 cm 2 / g, particularly preferably 20 to 40 cm 2 / g.
  • the size of the surface can be adjusted via the size of the granules used, with smaller granules achieving larger surfaces for the plastic molded body.
  • the surface is influenced by the degree of sintering, larger surfaces in the resultant plastic molded body according to the invention being produced by smaller sinter contact surfaces between the granules.
  • the plastic molded body according to the invention itself can be porous or non-porous, i.e. There may or may not be gaps between the individual granules.
  • the process includes the following steps:
  • step (d) removing the sintered plastic molded body from the mold.
  • the plastic granules are filled into a mold, the filling amount being at least two layers of polymer granules. It is advantageous if the granules are present in the sintered form as irregularly as possible and have the smallest possible contact areas. For this purpose, the granules are filled into the mold through a slot nozzle, which results in a random, irregular filling.
  • the sintered shape is of any size and shape and can be selected depending on what size and shape the resulting plastic molded body should desirably have.
  • step (b) takes place in a sintering furnace, as a result of which the plastic granulate is heated uniformly from all sides.
  • the temperature to which the plastic granulate is heated in order to achieve the melting of its surfaces depends on the plastic selected. For polyethylene or polypropylene, the temperature is usually between 80 and 220 ° C.
  • the melting temperature is reached when the plastic material from which the granules are made takes on a glassy appearance.
  • the heating is preferably carried out for 5 to 60 minutes, particularly preferably 15 to 20 minutes.
  • step (c) the melted plastic granules are cooled to room temperature.
  • the cooling happens very quickly, i.e. by quenching, for example by blowing in cold air.
  • the cooled plastic molded body is then removed from the mold in step (d).
  • the plastic molded body according to the invention is outstandingly suitable for use as a pre-filter material. It is used in the form of a loose fill. Due to the irregular structure of the individual molded plastic body according to the invention, when passing through Liquids vortex, also called turning points. These reversal points result in the filter effect and particles that are in the liquid to be filtered remain on the plastic molded bodies while the liquid flows through the bed. In order to achieve an excellent filter effect, a low bed height is sufficient due to the large number of reversal points.
  • the bed of the invention which can be used as a pre-filter material
  • Plastic molded bodies have the advantage that they have a low pressure drop when passing liquids, are light in weight and are chemically resistant and easy to clean.
  • 5.5 g of granules made of high density polyethylene (Hostalen GM 6255, manufactured by Mariac) are filled into a round sintered mold with a diameter of 55 mm.
  • the polyethylene used has a density (23 ° C, ISO 1183) of 0.951 g / cm 3 and a Vicat softening point B / 50 (ISO 306) of 84 ° C.
  • the mold filled with the granules is heated in a sintering oven to a temperature of 210 ° C. for 20 minutes. During this temperature treatment, the granules melt on the surface and can thus fuse with one another at their contact surfaces. The mold is then removed from the oven and the molded body is quenched by blowing in cold air.
  • the plastic molding thus obtained has a specific surface area between 20 and 40 cm 2 / g and a bulk density of 160 to 180 g / 1.
  • the bulk density was determined in accordance with DIN ISO 60.
  • the specific surface area of the molded plastic body according to the invention is determined by means of a caliper by measurement. It is assumed, which was also experimentally confirmed by krypton gas adsorption, that the plastic granulate used for the plastic molded body has no microporosity on the surface.
  • the granules of 10 plastic moldings forming the plastic molded body are measured with a caliper.
  • the proportion of the contact surfaces on which the granules have melted and which do not contribute to the surface is subtracted.
  • the surfaces determined in this way are based on 1 g of plastic molded body, the weight being determined by weighing.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filtering Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

L'invention concerne un corps moulé en plastique comprenant des particules plastique frittées irrégulièrement ayant une densité de 0,6 à 1,2 g/cm<3> et une densité en vrac (DIN-ISO 60) comprise entre 150 et 250 g/l. Ces corps moulés en plastique sont parfaitement adaptés, en vrac, comme matériau de préfiltration.
EP03772215A 2002-10-16 2003-10-14 Materiau de prefiltration Withdrawn EP1551616A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10248201 2002-10-16
DE20215896U 2002-10-16
DE20215896U DE20215896U1 (de) 2002-10-16 2002-10-16 Vorfiltermaterial
DE10248201A DE10248201B4 (de) 2002-10-16 2002-10-16 Vorfiltermaterial
PCT/EP2003/011383 WO2004035299A1 (fr) 2002-10-16 2003-10-14 Materiau de prefiltration

Publications (1)

Publication Number Publication Date
EP1551616A1 true EP1551616A1 (fr) 2005-07-13

Family

ID=32108789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03772215A Withdrawn EP1551616A1 (fr) 2002-10-16 2003-10-14 Materiau de prefiltration

Country Status (6)

Country Link
US (1) US20060141233A1 (fr)
EP (1) EP1551616A1 (fr)
JP (1) JP2006502883A (fr)
KR (1) KR20050083757A (fr)
AU (1) AU2003280374A1 (fr)
WO (1) WO2004035299A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110494214B (zh) 2016-12-16 2022-07-22 福罗德莱(张家港)包装制品有限公司 固体形式吸附剂

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL190121A (fr) * 1954-07-21 1900-01-01
BE561346A (fr) * 1956-10-04 1900-01-01
BE562196A (fr) * 1956-11-08 1900-01-01
US3048537A (en) * 1958-01-06 1962-08-07 Pall Corp Porous articles of polyethylene polymers and process of making the same
BE599486A (fr) * 1960-01-29 1900-01-01
DE2657943C3 (de) * 1976-12-21 1979-07-12 Vsesojuznyj Nautschno-Issledovatelskij Institut Sintetischeskich Smol, Wladimir (Sowjetunion) Verfahren zur Herstellung von offenporigen polymeren Materialien
US4184963A (en) * 1977-10-28 1980-01-22 Millipore Corporation Immersible molecular filter unit and process of making it
JPS5624428A (en) * 1979-08-06 1981-03-09 Nippon Synthetic Chem Ind Co Ltd:The Sintered product and its preparation
US4865789A (en) * 1983-11-14 1989-09-12 Akzo Nv Method for making porous structures
AT383815B (de) * 1984-09-26 1987-08-25 Rappold Helmuth F Mikroporoeses sintermaterial, verfahren zu seiner herstellung und seine verwendung
WO1993023464A1 (fr) * 1992-05-18 1993-11-25 Nauchno-Kommercheskoe Predpriyatie 'polimerplast' Materiau poreux et son procede d'obtention
US5419138A (en) * 1993-07-13 1995-05-30 Laroche Industries, Inc. Pellet extruding machine
JP3773342B2 (ja) * 1997-12-02 2006-05-10 三井化学株式会社 発泡性粒子
JP2001002824A (ja) * 1999-06-17 2001-01-09 Shimi Jaa Kogyo Kk 焼結プラスチック多孔体

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004035299A1 *

Also Published As

Publication number Publication date
US20060141233A1 (en) 2006-06-29
AU2003280374A1 (en) 2004-05-04
JP2006502883A (ja) 2006-01-26
WO2004035299A1 (fr) 2004-04-29
KR20050083757A (ko) 2005-08-26

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