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EP0808216A1 - Verfahren und Apparat zur elektrostatisch Reinigung von organische Flüssigkeiten - Google Patents

Verfahren und Apparat zur elektrostatisch Reinigung von organische Flüssigkeiten

Info

Publication number
EP0808216A1
EP0808216A1 EP96900694A EP96900694A EP0808216A1 EP 0808216 A1 EP0808216 A1 EP 0808216A1 EP 96900694 A EP96900694 A EP 96900694A EP 96900694 A EP96900694 A EP 96900694A EP 0808216 A1 EP0808216 A1 EP 0808216A1
Authority
EP
European Patent Office
Prior art keywords
liquid
impurities
purified
electrodes
electric field
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.)
Granted
Application number
EP96900694A
Other languages
English (en)
French (fr)
Other versions
EP0808216B1 (de
Inventor
Charles Frei
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Publication of EP0808216A1 publication Critical patent/EP0808216A1/de
Application granted granted Critical
Publication of EP0808216B1 publication Critical patent/EP0808216B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C5/00—Separating dispersed particles from liquids by electrostatic effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C5/00—Separating dispersed particles from liquids by electrostatic effect
    • B03C5/02—Separators

Definitions

  • the present invention relates to a method and a device for electrostatically purifying and clarifying organic liquids of plant, animal or synthetic origin, namely industrial solvents, hydraulic liquids, cutting liquids for machine tools, lubricating oils and for heating, fuels, vegetable and animal oils and essences, edible or not, and the like.
  • purification and clarification we mainly mean the elimination of particulate impurities suspended in the liquid, or substances of relatively high molecular weight in the more or less dissolved state, in particular in colloidal solutions.
  • the nature of these impurities can be arbitrary; it may be dust, particles resulting from wear of moving parts, lubricating particles, extraction products, fibers or other components of plant or animal origin, residual impurities, etc.
  • the impurities contained in such liquids generally consist of fibrous, resinous substances, polymers, amorphous or not, carbohydrates, complex lipids, unsaponifiable compounds, polypeptides and other materials of cytoplasmic origin.
  • the elimination of these impurities by conventional means, in particular filtering, decantation and centrifugation is generally very difficult and expensive or even impossible, the liquid remaining opaque despite all the efforts made. We have therefore tried to resolve these problems by applying known techniques for electrostatic purification and clarification.
  • the method according to the invention only consists in significantly reducing the water content of the liquid to be purified before subjecting it to treatment by electrostatic means. Indeed, it has been found that, for the electrostatic purification to take place, it is necessary and sufficient that the water content of the liquid to be purified is not greater than 0.3 percent. It is even preferable that it does not exceed 0.1 percent, or in some cases 0.03 percent. The lower the water content, the better the electrostatic purification takes place. It is therefore possible to control the degree of effectiveness thereof as required by adjusting the water content (degree of drying) of the liquid before the application of the electric field.
  • the single figure shows, schematically and by way of example, the device for purifying organic liquids comprising a drying installation.
  • the apparatus according to the present invention makes it possible to carry out the method according to the claims.
  • This device includes a device for drying the liquid to be purified, disposed upstream of the purification device. electrostatic. As shown schematically in fig,
  • the device according to the first embodiment comprises the following elements:
  • the actual electrostatic purification device comprises a tank 1 containing the liquid to be purified and at least two electrodes, respectively 2 and 3, to create the necessary electric field inside the tank 1.
  • the electrodes are connected to a source of high -tension 4.
  • the electrodes 2 and 3 are mobile and are extracted from the liquid in an alternative or continuous manner.
  • the electrodes 2 and 3 consist of a flexible, metallized, endless strip mounted between two rollers 5 and 6.
  • the central core 7 fixed, disposed in the space separating the two branches of the flexible strip, ie 2, or 3, is provided to force the liquid to be purified through the passage in the center where the electric field is established as a function of the high voltage applied to the electrodes.
  • rollers 6 While the rollers 6 rotate freely, the rollers 5 are driven by a mechanism not shown.
  • Each movable electrode, 2 and 3 is associated with a scraper 8 which serves to rid the material of impurities which has deposited on it under the influence of the electric field.
  • the scrapers 8 are connected to a tray 9 which receives the waste.
  • a heating installation 10 makes it possible, if necessary, to carry out the purification of the oils at a temperature higher than ambient temperature.
  • the drying device 11 which precedes the purification device proper can be an apparatus containing a 7 rotating cylinder 12 where the liquid which is sprayed on it spreads forming a thin layer.
  • a vacuum pump 13 dries the liquid very effectively.
  • the installation is completed by a supply tank 14, a tank for recovering the clean liquid 15, as well as the necessary conduits and pumps connecting the various elements.
  • the first example of application of the process relates to the purification of a crude oil, obtained by pressure extraction of oil seeds from coffee.
  • This coffee oil is presented in the raw state as a liquid of dark color and is opaque.
  • the light from a 3 mW HeNe laser beam is immediately dispersed where it enters the liquid and forms a luminous ball.
  • the scattering of light must be attributed to the colloidal particles which are the impurities which have to be removed.
  • the penetration distance of the laser beam determined with the naked eye, reaches 16 to 20 mm.
  • the oil On leaving the device, the oil is clarified.
  • the impurities in the coffee oil are only deposited on the positive electrode which is connected to the earth's potential. This considerably facilitates the removal of deposits on the conveyor belt serving as an electrode.
  • the strip circulating at a speed of 12 mm / min. is covered with a layer of residue about 1 mm thick. The losses, most of which are impurities, amount to 16% compared to the quantity of crude oil.
  • the second example of application of the process relates to an organic liquid used in the electronic industry, ⁇ -butyrolactone.
  • This liquid is used as a solvent to dissolve the uncured epoxy resin in the manufacture of printed circuits.
  • the liquid is recovered after this operation and is regenerated for reuse. Regeneration according to the traditional method takes place by distillation, which means a significant energy expenditure.
  • the contaminated liquid is introduced into the device described in the previous example where the contaminating material is deposited on the electrodes in the form of a conveyor belt under the effect of the electric field. Due to the lower viscosity of ⁇ -butyrolactone the flow rate reaches 4 to 5 liters per hour. The degree of clarification is sufficient for the liquid to be reusable as a solvent.

Landscapes

  • Electrostatic Separation (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
EP96900694A 1995-02-07 1996-02-07 Verfahren und apparat zur elektrostatischen reinigung von organischen flüssigkeiten Expired - Lifetime EP0808216B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH33595 1995-02-07
CH335/95 1995-02-07
PCT/IB1996/000101 WO1996024438A1 (fr) 1995-02-07 1996-02-07 Procede et dispositif de purification electrostatique de liquides organiques

Publications (2)

Publication Number Publication Date
EP0808216A1 true EP0808216A1 (de) 1997-11-26
EP0808216B1 EP0808216B1 (de) 1999-05-06

Family

ID=4184676

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96900694A Expired - Lifetime EP0808216B1 (de) 1995-02-07 1996-02-07 Verfahren und apparat zur elektrostatischen reinigung von organischen flüssigkeiten

Country Status (5)

Country Link
EP (1) EP0808216B1 (de)
JP (1) JPH11500657A (de)
DE (1) DE69602350T2 (de)
ES (1) ES2138804T3 (de)
WO (1) WO1996024438A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2011007820A1 (ja) * 2009-07-15 2012-12-27 国立大学法人 名古屋工業大学 粒子回収方法および粒子回収装置
CA2947806A1 (en) * 2016-11-07 2018-05-07 Sandoz Canada Inc. Visual inspection of difficult to inspect fluids

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1050074A (de) * 1964-05-25
FR2688146B1 (fr) * 1992-03-05 1994-05-20 Charles Frei Procede et dispositif de purification d'un liquide electriquement non conducteur.
DE4344828A1 (de) * 1993-12-28 1995-06-29 Oehmi Forsch & Ingtech Gmbh Verfahren und Vorrichtung zum Reinigen von Feststoffpartikeln enthaltenden Flüssigkeiten

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9624438A1 *

Also Published As

Publication number Publication date
ES2138804T3 (es) 2000-01-16
JPH11500657A (ja) 1999-01-19
DE69602350D1 (de) 1999-06-10
WO1996024438A1 (fr) 1996-08-15
DE69602350T2 (de) 2000-06-15
EP0808216B1 (de) 1999-05-06

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