EP0808216B1 - Verfahren und apparat zur elektrostatischen reinigung von organischen flüssigkeiten - Google Patents

Verfahren und apparat zur elektrostatischen reinigung von organischen flüssigkeiten Download PDF

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Publication number
EP0808216B1
EP0808216B1 EP96900694A EP96900694A EP0808216B1 EP 0808216 B1 EP0808216 B1 EP 0808216B1 EP 96900694 A EP96900694 A EP 96900694A EP 96900694 A EP96900694 A EP 96900694A EP 0808216 B1 EP0808216 B1 EP 0808216B1
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EP
European Patent Office
Prior art keywords
liquid
impurities
purified
strips
water content
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.)
Expired - Lifetime
Application number
EP96900694A
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English (en)
French (fr)
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EP0808216A1 (de
Inventor
Charles Frei
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Individual
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    • 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 continuously electrostatically purify liquids organic of plant, animal or synthetic origin, namely industrial solvents, hydraulic fluids, cutting fluids for machine tools, lubricating oils and heating, fuels, oils and gasolines vegetable or animal, edible or not, and the like.
  • liquids organic of plant, animal or synthetic origin namely industrial solvents, hydraulic fluids, cutting fluids for machine tools, lubricating oils and heating, fuels, oils and gasolines vegetable or animal, edible or not, and the like.
  • the impurities contained in such liquids are generally consisting of fibrous, resinous substances, polymers, amorphous or not, carbohydrates, lipids complexes, unsaponifiable compounds, polypeptides and other materials of cytoplasmic origin. Elimination of these impurities by conventional channels, in particular filtering, decantation and centrifugation is generally very difficult and expensive or even impossible, the liquid remaining opaque despite all the efforts made. So we tried to resolve these problems by applying known techniques of electrostatic purification and clarification.
  • US-4,155,924 has proposed a method for improving the quality of organic liquids of animal or vegetable origin containing impurities whereby this liquid is subjected to a refining step using an inorganic aqueous base forming a purified organic liquid containing moisture and residual soap formed by the aqueous inorganic base, mix this purified organic liquid with particles adsorbents, this mixture is dehydrated and degasified at high temperature and finally subjected to electrofiltration.
  • Such a method comprises a large number of steps and is by therefore complex to implement.
  • the present invention also relates to a device (illustrated by the attached drawing) to implement the present process, such as defined by claim 4.
  • the method according to the invention consists solely in reducing notably the water content of the liquid to be purified before submit to electrostatic treatment. Indeed, we found that in order for electrostatic purification to to take place, it is necessary and sufficient that the water content of the liquid to be purified is not more than 0.3 percent. he it is even preferable that it does not exceed 0.1 percent, or still in some cases 0.03 percent. The higher the water content is low, the better the electrostatic purification takes place. We can therefore control the degree of effectiveness of the following the needs by adjusting the water content (degree of drying) of the liquid before applying the electric field.
  • the single figure represents, schematically and in drawing example, the device for purifying liquids organic including a drying installation.
  • the apparatus according to the present invention makes it possible to set up implements the process according to the claims.
  • This apparatus includes a device for drying the liquid to purifier located upstream of the purification device electrostatic. As shown schematically in FIG. 1, the apparatus according to the first embodiment comprises the following elements :
  • the actual electrostatic purification device has a tank 1 containing the liquid to be purified and at least two electrodes, respectively 2 and 3, to create the field necessary inside the tank 1.
  • the electrodes are connected to a high-voltage source 4.
  • the electrodes 2 and 3 are mobile and are continuously extracted from the liquid.
  • the electrodes 2 and 3 consist of a strip flexible, metallized, endless, mounted between two rollers 5 and 6.
  • the fixed central core 7, arranged in the space separating the two branches of the flexible band, either 2 or 3, is provided to force the liquid to be purified to take the passage to the center where the electric field is established according to the high voltage applied to the electrodes. While the rollers 6 rotate freely, the rollers 5 are driven by a mechanism not shown.
  • Each mobile electrode, 2 and 3 is associated with a scraper 8 which serves to rid the material impurities that have settled on it under the influence of electric field.
  • the scrapers 8 are connected to a tank 9 which receives the waste.
  • a heating installation 10 allows, if necessary, to purify the oils at a temperature higher than room temperature.
  • the drying device 11 which precedes the purification itself can be a device containing a rotating cylinder 12 where the liquid which is projected on it spreads out in a thin layer.
  • a vacuum pump 13 presenting great surface the vacuum created using a vacuum pump 13 dries the liquid very effectively.
  • the installation is completed by a supply tank 14, a tank for collecting the clean liquid 15, as well as necessary conduits and pumps connecting the various elements.
  • the first example of application of the method relates to the purification of a crude oil, obtained by extraction with pressure of coffee oil seeds.
  • This coffee oil comes in the raw state as a dark colored liquid and is opaque.
  • the light from a 3 mW HeNe laser beam is immediately dispersed to where it enters the liquid and forms a luminous ball.
  • the dispersion of the light should be assigned to the colloidal particles which are the impurities that need to be removed.
  • the laser beam penetration distance determined by eye naked, 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 method relates to a organic liquid used in the electronics industry, ⁇ -butyrolactone.
  • This liquid serves as a solvent to dissolve the uncured epoxy resin in circuit manufacturing prints.
  • the liquid is recovered after this operation and it is regenerated for reuse. Regeneration according to the traditional method takes place by distillation, which means a significant energy expenditure.
  • drying products such as 4 ⁇ molecular sieves, calcium chloride (CaCl 2 ), silica gel, Sicapent® (Merck brand).
  • the water content is reduced to a value less than 300 ppm after the liquid has been brought into contact with one of the drying agents mentioned above for one to two hours. It should be noted that the regeneration of siccative products reduces the energy efficiency of all operations, which nevertheless remains always very favorable.
  • 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.

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  • Electrostatic Separation (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Claims (4)

  1. Verfahren zur kontinuierlichen elektrostatischen Reinigung von organischen Flüssigkeiten, welche mit mineralischen oder organischen Substanzen, die als Lösung oder als Dispersion kolloidaler oder nicht-kolloidaler Teilchen vorliegen, verunreinigt sind, dadurch gekennzeichnet, dass
    man zunächst die besagte Flüssigkeit einem Trocknungsprozess unterwirft, bis der Wassergehalt den Wert von 0.3% nicht mehr überschreitet, und
    man anschliessend diese Flüssigkeit zwischen mindestens zwei parallelen Streifen von mindestens zwei aus Endlosbändern bestehenden Elektroden leitet, wobei die Elektroden mit den entsprechenden Anschlüssen eines Hochspannungsgerätes verbunden sind, so dass zwischen den Elektrodenstreifen ein elektrisches Feld entsteht, welches die Verunreinigungen auf einem der besagten Elektrodenstreifen ablagert, und
    man die besagten endlosen Elektrodenstreifen so in Bewegung versetzt, dass gleichzeitig die auf der Oberfläche befindlichen Verunreinigungen entsorgt und die von den Verunreinigungen befreiten Elektrodenstreifen wieder in die zu reinigende Flüssigkeit hineingeführt werden.
  2. Verfahren gemäss Patentanspruch 1, dadurch gekennzeichnet, dass man die besagte, zu reinigende Flüssigkeit einem Trocknungsprozess unterwirft, bis der Wassergehalt den Wert von 0.1% unterschreitet.
  3. Verfahren gemäss Patentanspruch 1, dadurch gekennzeichnet, dass man die besagte, zu reinigende Flüssigkeit einem Trocknungsprozess unterwirft, bis der Wassergehalt den Wert von 0.03% unterschreitet.
  4. Vorrichtung zur Verwirklichung des Verfahrens gemäss Patentanspruch 1, dadurch gekennzeichnet, dass sie aus folgenden Teilen besteht
    einem Aggregat (11, 12) zum Trocknen der zu reinigenden Flüssigkeit bis der Wassergehalt den Wert von 0.3% nicht mehr überschreitet,
    einem Aggregat zum Reinigen (1), welches zwei Endlosbänder (2, 3) mit einer metallischen Oberfläche enthält, die von zwei Walzen (5, 6) geführt werden, deren eine an ein Antriebsgerät gekoppelt ist, diese beiden Endlosbänder (2, 3) sind als Elektroden mit den entsprechenden Anschlüssen eines Hochspannungsgerätes verbunden, so dass zwischen den Elektrodenstreifen ein elektrisches Feld entsteht, welches die Verunreinigungen auf einem der besagten Elektrodenstreifen ablagert,
    einem Rohrwerk, welches die Apparatur zum Trocknen der zu reinigenden Flüssigkeit (11, 12) mit dem Reinigungsaggregat (1) verbindet, und
    einem Gerät zum Ablösen der Verunreinigungen, welche auf der Oberfläche des besagten Endlosbandes (2, 3) im Verlauf der Bewegung abgelagert werden.
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
CH335/95 1995-02-07
CH33595 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 EP0808216A1 (de) 1997-11-26
EP0808216B1 true 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)

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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
WO2011007820A1 (ja) * 2009-07-15 2011-01-20 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

Also Published As

Publication number Publication date
WO1996024438A1 (fr) 1996-08-15
DE69602350D1 (de) 1999-06-10
EP0808216A1 (de) 1997-11-26
DE69602350T2 (de) 2000-06-15
ES2138804T3 (es) 2000-01-16
JPH11500657A (ja) 1999-01-19

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