WO2020234733A1 - Dispositif d'électrode émettrice de champs électrostatiques haute tension pour la stérilisation de liquides - Google Patents

Dispositif d'électrode émettrice de champs électrostatiques haute tension pour la stérilisation de liquides Download PDF

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Publication number
WO2020234733A1
WO2020234733A1 PCT/IB2020/054650 IB2020054650W WO2020234733A1 WO 2020234733 A1 WO2020234733 A1 WO 2020234733A1 IB 2020054650 W IB2020054650 W IB 2020054650W WO 2020234733 A1 WO2020234733 A1 WO 2020234733A1
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Prior art keywords
electrode
liquid
coating
ceramic
electrostatic fields
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PCT/IB2020/054650
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English (en)
Spanish (es)
Inventor
Edison Fabian REYES GOMEZ
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Reyes Gomez Edison Fabian
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Publication of WO2020234733A1 publication Critical patent/WO2020234733A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/02—Details
    • A61N1/04—Electrodes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods

Definitions

  • Figure 1 is a side view of the device (1) / (1 ') sterilizing microorganisms of the liquid (10) according to the invention, where the proximity of the liquid (10) to the surface 2 and wherein the electrodes (1) / (1 ') are naked and have been represented by a solid rectangular figure without shading.
  • the term "bare” refers to the metallic part of the electrode without any kind of coating, layer or treatment on its surface.
  • Figure 1 A corresponds to a top or bottom view of the metal part of the device (1) / (1 ') of Figure 1.
  • Figure 2 corresponds to the same side view of the device (1) / (1 ') but where the different layers or coatings that enclose it can be seen. In the center you can see the metallic part of the electrode as it is in figure 1, then the outermost layer that corresponds to the polymeric coating (2b) and the coating or ceramic layer (2a) that is attached to the surface 2 of said electrode. This figure shows with broken lines the configuration of the coatings 2a and 2b on the electrode (1) / (1 ') (plane in hidden lines).
  • Figure 2A shows the same view of figure 2 but seen in four different sections: A, B, C and D; and a bottom view E, where the view of section A is in the ceramic coating (2a); view B is on the surface (2), view C is on the opposite side to said surface (2) in the thin polymeric coating (2b), view D corresponds to the view of the side section of the thin polymeric coating ( 2b) and the view corresponds to the bottom view of the electrode (1) / (1 ').
  • This figure shows the different hidden line plane section cuts for the following figures.
  • Figure 3 corresponds to the view of section B of figure 2A where it is a longitudinal section of the electrode device (1) / (1 ') showing how the surface (2) of the electrode (1) or (1 ') is surrounded by the polymeric coating (2b) and wherein said surface (2) will support a ceramic coating (2a).
  • Figure 3A corresponds to the view of section A of figure 2A where it is a longitudinal section of any of the electrodes (1) or (1 ') but on the ceramic layer (2a) adhered to the surface 2 where in this exemplary figure, the total of said surface (2) shown in figure 3 has been placed.
  • the ceramic coating (2a) is represented in the figure with a dense striped shading and the polymeric coating (2b) is represented with faint striped shading.
  • Figure 4 corresponds to view E of figure 2A which corresponds to the lower longitudinal external view of the electrode (1) / (1 ') wherein said face of the electrode is partially covered with the thin polymeric coating (2b ) exposing a central portion of the ceramic coating (2a).
  • This figure has no shading since it does not show a section cut but an external view.
  • Figure 5 corresponds to section C of figure 2A on the plastic coating (2b) which is on the opposite side to the surface (2) of the electrode (1) / (1 '), where a hole can be seen (1 a) in its central part that exposes the metallic part of the electrode with respect to the thin polymeric coating (2b) to be connected to the high voltage circuit.
  • the polymeric coating (2b) is shaded with light stripes.
  • Figure 6 corresponds to section D of figure 2A and is a cross section of the device (1) / (1 ') in the lateral part of the polymeric coating (2b) which also corresponds to the side view of said device from figure 1 but already coated; and where the flow of the liquid (10) that is in contact with the central part of the ceramic coating (2a) shown in figure 4 is indicated.
  • Figure 7 corresponds to a longitudinal view of the device (1) / (1 ') with hidden lines showing the characteristic construction lengths L1, L2 and Re; where L1 is the distance from the geometric center of the ceramic surface (2a) of said electrode to the near contour or junction border of the ceramic coating (2a) with the polymeric coating (2b), L2 is the distance from the geometric center of the ceramic coating (2a) of the electrode device (1) / (1 ') to the outside of the polymeric coating (2b) and Re is the radius of the hole (1 a) that is on the surface opposite to the surface (2).
  • L1 is the distance from the geometric center of the ceramic surface (2a) of said electrode to the near contour or junction border of the ceramic coating (2a) with the polymeric coating (2b)
  • L2 is the distance from the geometric center of the ceramic coating (2a) of the electrode device (1) / (1 ') to the outside of the polymeric coating (2b)
  • Re is the radius of the hole (1 a) that is on the surface opposite to the surface (2).
  • Figure 8 shows an example of chamber (B) that can house the electrode device (1) / (1 ') for sterilizing a liquid (10).
  • any material be it food or medicinal liquid, such as, for example, but not limited to juices, sums, dairy products, syrups, serums, injectable liquids and vaccines, among other liquids for human or animal consumption
  • a traditional method of sterilization is used based on the transfer of large temperature gradients by indirect heating and cooling.
  • the heating temperature is low, it is necessary to maintain the heating for a longer period of time so that a safe sterilization for human or animal consumption is experienced. But if the heating temperature is ensured relatively high, the residence time in the process can be greatly reduced.
  • the sterilization temperature directly influences the rate of destruction of the useful components of natural origin of the food or the medicinal substance, such as nutrients, vitamins, active principles, organoleptic properties. of the liquid and in general, the original biochemical properties of the food or drug.
  • the first problem is that there is an upper limit of application voltage, which is worsened if there are gas bubbles in the liquid medium because dielectric breaks are created in the liquid and short-circuit electrical discharges occur that overheat the system and cause its failure. hurt.
  • the second problem is that water, the basis of most of the liquids to be sterilized, has a relatively high electrical conductivity, which leads to spending a significant amount of energy per passage of electrical current, at increases in temperature that are difficult to control with respect to to the flow to be sterilized and to provide the liquid with plasma and radical energy that oxidizes and decomposes the organic matter on the surface of the electrodes.
  • the patent document CN 102526776 which describes a liquid sterilization processing chamber with a non-uniform electric field, where an internal electrode and an external electrode are arranged coaxially and vertically to form a non-uniform electric field between the inner electrode and the outer electrode, whereby the liquid flows into the sterilization processing chamber from the top of the chamber and passes through an isolation liquid separation ring to form a thin Liquid film on the outer surface of the inner electrode, the liquid being sterilized by the electric field formed between the inner electrode and the outer electrode while the liquid flows down along the outer surface of the inner electrode by the action of gravity.
  • Patent document JP2010142446 is also known which reports a pulsed electric field sterilization apparatus with means of preventing the distribution of energy between the faces of the electrodes to achieve the effect of sterilization with voltage instead of electric currents , wherein the apparatus is capable of reducing or preventing the generation of heat by energy distribution.
  • the pulse electric field sterilization apparatus has a liquid channel with a pair of electrodes facing each other and a pulse power supply connected to the electrodes and when the liquid to be treated, passes between the electrodes, the high pulse Voltage is applied between the electrodes to kill bacteria in the liquid.
  • patent JP2010057423 provides a method and an apparatus for sterilizing liquid food products by means of a short wave electric field that is capable of efficiently sterilizing heat resistant spores contained in said products including raw milk and soy milk.
  • the method includes the application of a 10-50 MHz frequency electric field to the liquid food product through an insulated thin film on an electrode surface.
  • the isolated film is preferably obtained by sticking to the surface of an electrode or by directly forming a thin film up to 50 ⁇ m thick.
  • the liquid food product to be sterilized is, for example, a food that contains proteins that have the possibility of changing their quality by high heat.
  • patent JP20080806259 which reports an electric field sterilization device for liquid food materials, wherein the device comprises a frequency suppression spark generation component and an insulating spacer plate that it is located between a pair of parallel electrode plates; wherein the spacer plate is provided with a long flow path partition hole, which passes through the surface of the table and extends along the surface thereof; An inlet port is opened on one of the electrode plates at a position corresponding to the end portion of one side of the long hole and an outlet port is opened in the other plate at a position corresponding to the end portion of the other side of the long hole, so that the flow path from the inlet port to the outlet port through the long hole is formed separately.
  • the present invention is directed to an electrode device (1) / () that is located inside a chamber (B) for the microbiological sterilization of liquids by electric field that is responsible for emitting and transmitting electrostatic fields voltage to a flow of liquid to be sterilized.
  • the operation of this invention is essentially based on the germicidal principle of irreversible electroporation of microbiological populations when subjected to high voltage electric fields. Microbial populations are usually found in liquids that are industrially processed for mass consumption such as dairy-type foods; juices and sumos among others; and liquids for pharmaceutical products such as syrups, where such microbial populations must be controlled for the sake of human health.
  • This invention is preferably directed to liquids for the food and pharmaceutical area, especially, products of natural origin and without artificially gassed.
  • the device (1) / (1 ') of the invention consists of electrode sheets (1) / (1') as shown in Figure 1 and 1 A, preferably square and with low roughness, of a material with high electrical conductivity and high mechanical rigidity as it can be, but not limited to titanium, steel or chromium; which are coated by a configuration consisting of a ceramic coating (2a) and a polymeric or polymer coating (2b) as shown in figure 2.
  • the surface (2) of the metal foil of the electrode (1) / (1 ') that is more immediate to the flow of liquid (10) to be sterilized, has mechanically adhered a thin ceramic coating (2a), made of AI2O3 (alumina) or, failing that, preferably an oxide ceramic (ceramic with at least one oxygen atom in its chemical formula), such as common ceramics such as titanium oxide, silicon dioxide, mica or zirconium, or more complex in its crystalline structure such as titanate of calcium and copper, or strontium titanate.
  • a thin ceramic coating (2a) made of AI2O3 (alumina) or, failing that, preferably an oxide ceramic (ceramic with at least one oxygen atom in its chemical formula), such as common ceramics such as titanium oxide, silicon dioxide, mica or zirconium, or more complex in its crystalline structure such as titanate of calcium and copper, or strontium titanate.
  • a section of the cross section of the surface (2) where the ceramic coating (2a) adheres is seen in figure 3.
  • Part of the outer area of the ceramic coating (2a) on the respective faces of the electrode (1) / (1 '), is the one that comes into contact with the liquid to be sterilized, where said ceramic coating (2a) is homogeneously distributed from the geometric center of the electrode (1) / (1') to a distance from the edge of said electrode (1 ) / (1 ') leaving a small bare surface (2) in its contour to be joined with the polymeric coating (2b).
  • figure 3A shows a sectional view of the longitudinal section of the ceramic layer (2a) adhered to the surface (2) , section cut indicated in figure 2A.
  • the thin polymeric material coating (2b) covers the entire surface of the electrode (1) / (1 ') attached to its ceramic coating (2a) except for two areas .
  • the first area that does not cover the coating (2b) corresponds to a concentric figure with the shape of the electrode (1) / (1 ') that exposes the ceramic coating (2a) as shown in Figures 2 and 4.
  • the wiring that is connected to the device of the invention allows the electrostatically polarizing of high voltage to the electrode sheet (1) / (1 ') from an alternating, direct or pulsed high voltage source.
  • the rest of the resulting surface of the electrode (1) / (1 ' ) attached to its ceramic coating (2a) is covered by the thin polymer coating (2b).
  • Figures 2A and 6 show a cross section of any lateral section that results from coating the electrode (1) / (1 ' ) and its adhered ceramic coating (2a) with the thin polymer (2b).
  • the layer of the oxide ceramic material (2a) has the functions of preventing the transit of electric current towards the liquid (10) from, specifically, the metal face adjacent to it and more importantly, transferring the greatest possible proportion of the electric field of high voltage coming from the sheet or electrode device (1) / (1 ') to the liquid (10) to be sterilized, reducing dielectric losses.
  • the optimal coating (2a) of any oxide ceramic material the passage of electric current from this metal face can be prevented, because its electrical resistivity will be compared to an insulator.
  • the dielectric constant of the ceramic material of the ceramic coating ( 2a), the thickness of said coating (2a), and the dielectric strength thereof is the one with a very thin thickness, with the highest possible dielectric constant, and the highest possible dielectric strength.
  • the consequence of these conditions is the reduction of dielectric transfer losses.
  • the reasons for these conditions respectively is that the higher the dielectric constant, the greater the electric displacement field is guaranteed on the surface of the electrode, the lower the thickness of the ceramic coating (2a) the effective electric field coming from the electrode (1) / (1 ') is increased. ) that is transferred to the liquid (10) and the higher the dielectric strength of the material, the higher the electric field it can withstand without breakage.
  • this ceramic coating (2a) has to be preferably AI2O3, with a thickness of 0.05mm to 0.5mm and is bonded and manufactured with a HVOF or PVD thermal projection method using a ceramic particle size from 50 nanometers. at 50 microns.
  • this has as its main function to electrostatically seal the electrode sheet (1) / (1 ') so that this electrode can exert the greatest possible electrical force to the liquid (10) for a long time by the directed emission of its associated high-voltage electrostatic field and to prevent high-voltage discharges and transit of electric current from the other surfaces of the electrode sheet (1) / (1 ') towards the liquid (10) or towards the outside .
  • Making this seal is done with the correct adhesion of the thin polymer coating (2b) both on the metal surface of the electrode sheet (1) / (1 ') and on the surface of its ceramic coating (2a) described above, as well as achieving uniformity within said coating with respect to its maximum possible intrinsic density.
  • the thin polymer coating (2b) also has the function of preventing the mass diffusion of molecules from the liquid (10) to be sterilized, when the device is placed in continuous flow, both in the vicinity of its union with the ceramic coating ( 2a); as well as inside the thin polymer coating (2b) for the consequent durability of the device of the invention.
  • This containment is achieved with a high molecular weight and highly hydrophobic polymer, and with correct adhesion and mechanical compression in its coating.
  • this lining should be made, preferably of PTFE, and has a thickness of from 0.5 mm to 1 mm.
  • L1 is the distance from the geometric center of the ceramic surface (2a) of the electrode (1) / (1 ') to the close profile of the junction of the ceramic coating (2a) and the thin polymer coating (2b)
  • L2 is the distance from the geometric center of the ceramic surface (2a) of the electrode to the external part of the thin polymer coating (2b)
  • Re is the radius of the hole (1 a) that uncovers partially the metal foil of the polymer coating electrode (2b) and which is on the surface opposite to the surface (2)
  • the L2 / L1 ratio is greater than 1.11 (point of minimum requirement) and less than 2.33 (point of maximum requirement), preferably between 1.11 and 2.0; the Rc / L2 ratio to ensure the highest possible performance is greater than 0.01 and less than 0.09, preferably between 0.01 and 0.05.
  • the electrode (1) / (1 ') functions as a cathode or anode for the emission of high voltage electrostatic fields.
  • This electrode device (1) / (1 ') is electrically charged and polarized with the help of a high voltage source (not shown) that can be alternating, direct or pulsed and that offers a potential difference that can vary from 50KV to 450KV .
  • a high voltage source not shown
  • the device (1) / (1 ') is placed in a sterilization chamber (B) to transmit its emission of electrostatic fields to a flow of liquid (10) to be sterilized.
  • FIG. 8 An example chamber (B) is illustrated in figure 8.
  • the electrode device (1) and its identical device (1 ') face in a specular way and at a distance from 0.1 mm to 1000 mm, preferably, from 1mm to 500mm, more preferably between 5mm to 150mm; in parallel planes, and pointing to the liquid (10) that is electrically polarized as necessary to emit electrostatic fields from 5KV / mm to 600 KV / mm by direct contact to the liquid (10), preferably from 10KV / mm to 100 KV / mm, more preferably from 10KV / mm to 60KV / mm.
  • Direct contact emission of electric fields in this range occurs in a time span from 1 ms to 100 ms, more preferably from 2 ms to 50 ms, and more preferably from 3 ms to 30 ms.
  • the best way to use this invention is by placing an electrode (1) with its identical (1 ' ) in a special sterilization chamber (B) that has correct electrical insulation and a particular shape that allows to contain and direct the flow of liquid (10) to be treated. Furthermore, the liquid (10) can be fed to special chambers (B) arranged in series or in parallel by a system that provides continuous flow and a pre-treatment of partial removal of solids and gases; and must be downloaded directly to quality testing or packaging and / or final packaging.
  • the sterilization chamber (B) that incorporates this invention in addition to separating the electrodes (1) and (1 ') at a distance between 5mm and 150mm, must be sealed together with them, in such a way that it allows a continuous flow with correct electrical and hermetic insulation by metallic pipes that allow the entry and exit of the liquid (10).
  • the chambers (B) must guarantee the total immobilization of the device (1) / (1 ') of this invention so that they constantly point parallel to the liquid (10) and in this way, the electrodes (1) and (1') can provide a uniform electrostatic field to the liquid (10).

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Biomedical Technology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • General Chemical & Material Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Electrochemistry (AREA)
  • Epidemiology (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)

Abstract

L'invention concerne un dispositif d'électrode (1)/(1') compact d'émission de champs électrostatiques haute tension pour le traitement de stérilisation industrielle de liquides - préférablement d'origine naturelle et sans gazéification - qui consiste en une électrode (1) ou analogue (1') en forme de plaque revêtue d'une configuration de plastique et céramique, de préférence, de PTFE (polytétrafluoroéthylène) et d'Al2O3 (alumine) respectivement, qui est caractérisée principalement en ce qu'elle présente la capacité à émettre des champs électrostatique de 10kV/mm à 60kV/mm, à l'intérieur d'un flux de liquide, le dispositif (1)/(1') devant être disposé dans une chambre de stérilisation spéciale. En outre, le dispositif stérilisateur de micro-organismes au moyen de champs électrostatiques haute tension (1)/(1') conformément à la présente invention, est utile pour des procédés au niveau industriel, préférablement pour la stérilisation de liquides d'origine naturelle, sans gazéification artificielle et en flux continu pour la préservation et la conservation des qualités biochimiques d'origine du liquide à traiter et l'élimination d'émissions de carbone résultant du procédé classique de stérilisation basé sur des transferts de chaleur.
PCT/IB2020/054650 2019-05-21 2020-05-15 Dispositif d'électrode émettrice de champs électrostatiques haute tension pour la stérilisation de liquides WO2020234733A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CONC2019/0005182 2019-05-21
CONC2019/0005182A CO2019005182A1 (es) 2019-05-21 2019-05-21 Dispostivo electrodo emisor de campos electrostáticos de alto voltaje en la esterilización de líquidos

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Publication Number Publication Date
WO2020234733A1 true WO2020234733A1 (fr) 2020-11-26

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PCT/IB2020/054650 WO2020234733A1 (fr) 2019-05-21 2020-05-15 Dispositif d'électrode émettrice de champs électrostatiques haute tension pour la stérilisation de liquides

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CO (1) CO2019005182A1 (fr)
WO (1) WO2020234733A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008155315A1 (fr) * 2007-06-19 2008-12-24 Siemens Aktiengesellschaft Dispositif de nettoyage et de désinfection de liquides
US20120048792A1 (en) * 2009-05-12 2012-03-01 Tomoki Saitou Liquid treatment discharge unit, humidity control device, and water heater
CN104909436A (zh) * 2015-06-10 2015-09-16 苏州大学 一种电解型杀菌消毒装置、制备方法及应用
WO2018041736A1 (fr) * 2016-08-31 2018-03-08 Robert Bosch Gmbh Dispositif de traitement de liquide, dispositif d'évacuation de liquide et procédé de traitement d'un liquide

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008155315A1 (fr) * 2007-06-19 2008-12-24 Siemens Aktiengesellschaft Dispositif de nettoyage et de désinfection de liquides
US20120048792A1 (en) * 2009-05-12 2012-03-01 Tomoki Saitou Liquid treatment discharge unit, humidity control device, and water heater
CN104909436A (zh) * 2015-06-10 2015-09-16 苏州大学 一种电解型杀菌消毒装置、制备方法及应用
WO2018041736A1 (fr) * 2016-08-31 2018-03-08 Robert Bosch Gmbh Dispositif de traitement de liquide, dispositif d'évacuation de liquide et procédé de traitement d'un liquide

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