EP0435892A1 - Procede d'elimination d'emulsions epuisees du type huile dans l'eau - Google Patents

Procede d'elimination d'emulsions epuisees du type huile dans l'eau

Info

Publication number
EP0435892A1
EP0435892A1 EP89910094A EP89910094A EP0435892A1 EP 0435892 A1 EP0435892 A1 EP 0435892A1 EP 89910094 A EP89910094 A EP 89910094A EP 89910094 A EP89910094 A EP 89910094A EP 0435892 A1 EP0435892 A1 EP 0435892A1
Authority
EP
European Patent Office
Prior art keywords
membrane filtration
membrane
subjected
membranes
flow
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.)
Pending
Application number
EP89910094A
Other languages
German (de)
English (en)
Inventor
Uwe Müller
Reinhold Sedelies
Brigitte Spei
Volker Wehle
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.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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 Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Publication of EP0435892A1 publication Critical patent/EP0435892A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/04—Breaking emulsions
    • B01D17/047—Breaking emulsions with separation aids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/08—Thickening liquid suspensions by filtration
    • B01D17/085—Thickening liquid suspensions by filtration with membranes
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/32—Hydrocarbons, e.g. oil
    • C02F2101/325—Emulsions

Definitions

  • the invention relates to a method for disposing of used oil / water emulsions, the emulsion being cleaved with an organic spa medium, the water phase formed during the cleavage being subjected to micro / ultrafiltration and the retentate obtained in membrane filtration being fed to a subsequent cleavage batch approx.
  • oil / water emulsion is understood below to mean both oil-in-water and water-in-oil emulsions.
  • Such oil / water emulsions occur in large quantities in the metal-producing, metal-working and metal-processing industries.
  • the emulsions are used in these industries as cooling lubricants, drawing aids as well as drilling and grinding agents in cutting and shaping processes, e.g. B. used for grinding, drilling, drawing and rolling.
  • these emulsions mainly consist of natural or synthetic oils of different chemical composition and origin, furthermore in the oil and water phase from emulsifiers, wetting agents and other auxiliaries.
  • the classic alkaline contaminated by oil input should also neutral or acidic degreasing and cleaning baths.
  • these emulsions When used, these emulsions are subject to wear and must be disposed of regularly or discontinuously become .
  • the emulsions are usually split. This means that the oil portion must be separated as much as possible from the split water phase so that it can be discharged into the sewage system or the receiving water in an ecologically harmless manner after appropriate aftertreatment.
  • the aftertreatment it is important to comply with the wastewater limit of 10 or 20 mg / l with regard to petroleum ether-extractable substances. In some cases, attention must also be paid to maintaining a certain COD value (chemical oxygen demand).
  • the oil phase can be bound by adding adsorbents (adsorptive cleavage).
  • adsorbents asdsorptive cleavage
  • coagulation aids are added to the emulsions (flotation). This addition is necessary because of the high stability of the emulsions used today. Large amounts of sludge also accumulate here.
  • the emulsion is dewatered with the aid of a uitrafiltration membrane. In practice, this method can hardly achieve water contents below 50% within the oil phase.
  • the emulsion is separated into a water phase and a free-floating oil phase by adding acid in the pH range of less than 2.
  • the accruing Acid waste oil flotate leads to problems because its disposal causes high costs. Further problems arise with this so-called acid splitting in the salting-up of the splitting water phase by acid and the subsequent necessary addition of neutralizing agent.
  • the emulsion is split by salt.
  • large amounts of salt must be used, which lead to a strong salting of the split water phase.
  • the split water phase can therefore generally no longer be discharged into the sewage system or the receiving water.
  • the organic splitting agents contain cationic surfactants, which can cause irreversible blocking in organic membranes.
  • cationic surfactants can cause irreversible blocking in organic membranes.
  • polysulfone ultrafiltration membranes tend to block slowly when applied multiple times with a pure 1% solution of a high molecular weight cationic surfactant in fully ionized water with only moderate retention.
  • a cleaning of the blocked membrane by rinsing with water is not possible at all, cleaning with chemical dosing is hardly possible or only with great effort.
  • the invention is therefore based on the object of developing a method of the type mentioned in which blocking of the membrane is largely ruled out.
  • This object is achieved according to the invention in that the retentate is fed to the subsequent cleavage batch prior to cleavage and that either inorganic membranes or organic membranes and such a cleaving agent are used, which are essentially not present on these membranes is adsorbable or, when using organic membranes with negative terminal groups, the splitting agent is added at most in the concentration that no additional free cationic surfactants are present.
  • microfiltration often falls below the limit values required by law and also the limit values currently under discussion.
  • microfiltration has several times higher specific permeate flow rates with low energy input.
  • the permeate obtained in micro / ultrafiltration be subjected to reverse osmosis. Such further purification of the permeate can also be carried out by a subsequent precipitation.
  • splitting agents be used which are essentially not adsorbable on these membranes. Splitting agents with certain, particularly high molecular weights meet this requirement.
  • the operating parameters influence both the permeate quality and the possible operating time between two cleaning intervals.
  • a turbulent flow against the membrane must be ensured.
  • the overflow speed should be at least 3 m / s, preferably 5 to 6 m / s in microfiltration.
  • the temperature of the water phase during membrane filtration is preferably at most 35 ° C.
  • small transmembrane pressure differences are advantageous; microfiltration should be carried out with a pressure difference of at most 1 bar averaged over the length of the membrane.
  • the pressure difference within the membrane can also be reduced, for example, by increasing the pressure on the permeate side.
  • a further, particularly advantageous embodiment of the method according to the invention is to regulate or limit the permeate flow at the membrane at a constant overflow rate. This increases the permeate yield between two cleaning intervals.
  • Figure 1 a block flow diagram of the method for disposing of used oil / water emulsions
  • Figure 2 a diagram in which the flow in l / h and m 2 of
  • the emulsion is broken in the chemical pre-splitting by defined addition of organic fission chemicals.
  • the floating, low-water oil phase which at the same time adsorbs some of the heavy metals and thus relieves the gap water phase, can be disposed of, for example by incineration.
  • the split water phase is fed to membrane filtration.
  • the membrane is a micro or. Ultrafiltration membrane (MF / UF), depending on the application.
  • MF / UF Ultrafiltration membrane
  • the permeate flowing out of the membrane filtration is discharged as waste water.
  • the retentate from membrane filtration which has been concentrated by a factor of 10 to 20 by filtration, is added to a further cracking batch before cracking.
  • FIG. 2 shows the results of tests with one type of emulsion and different membranes.
  • Curve (a) shows the flow of an uncleaved emulsion through an organic ultrafiltration membrane with a separation limit of 20,000 D over time. The small amount of integral permeate that can be achieved with a very low specific permeate flow is clearly recognizable.
  • Curve (c) shows the flow of split water through the same membrane. The flow of cracked water through an inorganic membrane with a separation limit of 10,000 D is shown in curve (b).
  • Curves (d) and (e) represent the flow rate through a microfiltration membrane (0.2 ⁇ m) made of inorganic material. In all the tests described, the wastewater limit value for petroleum ether extractable substances was below 20 mg / m 3 .
  • the table below shows an exemplary embodiment in which an emulsion with a pH of 6.8 was split and the split water was subsequently subjected to ultrafiltration.
  • the permeate obtained was purified by means of reverse osmosis.
  • the abbreviations within the table mean:
  • PE equal to petroleum ether extract
  • n- and k-surfactants are anionic, nonionic and cationic surfactants
  • NM means wetting agent
  • UF means ultrafiltration
  • RO means reverse osmosis
  • n. n. means undetectable. It can be seen from the Tabejie that the PE value initially drops drastically to a value which does not yet reach the required limit of 20 mg / l due to the emulsion splitting. This limit value is obtained after ultrafiltration. Reverse osmosis can be used for even higher purity of the split water. This enables the PE value to be reduced to below the detection limit. The COD value and the heavy metal content also decrease more or less due to the individual cleaning stages. In particular, it can be seen that the metal content largely remains in the oil phase.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

L'invention concerne un procédé pour l'élimination d'émulsions épuisées du type huile dans l'eau ou eau dans l'huile, l'émulsion étant dissociée au moyen d'un agent de séparation organique. Afin de disposer d'un procédé permettant de travailler de façon économique, tout en respectant les prescriptions légales, il est proposé que la phase aqueuse formée lors de la dissociation soit soumise à une micro ultrafiltration, et que le rétentat se présentant lors de la filtration sur membrane soit soumis à une opération subséquente de séparation, avant de procéder à la dissociation.
EP89910094A 1988-09-21 1989-09-12 Procede d'elimination d'emulsions epuisees du type huile dans l'eau Pending EP0435892A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3831976 1988-09-21
DE3831976A DE3831976A1 (de) 1988-09-21 1988-09-21 Verfahren zum entsorgen verbrauchter oel-/wasseremulsionen

Publications (1)

Publication Number Publication Date
EP0435892A1 true EP0435892A1 (fr) 1991-07-10

Family

ID=6363360

Family Applications (2)

Application Number Title Priority Date Filing Date
EP89910094A Pending EP0435892A1 (fr) 1988-09-21 1989-09-12 Procede d'elimination d'emulsions epuisees du type huile dans l'eau
EP89116862A Withdrawn EP0361201A1 (fr) 1988-09-21 1989-09-12 Procédé pour se débarrasser d'émulsions usées huile-eau

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP89116862A Withdrawn EP0361201A1 (fr) 1988-09-21 1989-09-12 Procédé pour se débarrasser d'émulsions usées huile-eau

Country Status (3)

Country Link
EP (2) EP0435892A1 (fr)
DE (1) DE3831976A1 (fr)
WO (1) WO1990003332A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2692164B1 (fr) * 1992-06-16 1994-11-10 Elf Antar France Procédé d'ultrafiltration d'émulsions stabilisées.
DE4221936A1 (de) * 1992-07-03 1994-01-05 Bayer Ag Verfahren zur Aufarbeitung von Öl-in-Wasser-Emulsionen
EP0590769B1 (fr) * 1992-09-30 1998-04-29 Baker Hughes Incorporated Procédé d'élimination des composés organiques solubles dans l'eau à partir d'eau de traitement d'huile
IT1262053B (it) * 1993-01-20 1996-06-19 Casco Nobel Ind Prod Procedimento per il recupero della sericina disciolta nei bagni di sgommatura, impianto per realizzare tale procedimento e sericina cosi' ottenuta
DE4410694A1 (de) * 1994-03-28 1995-10-05 Henkel Kgaa Verfahren zum Reinigen des Abgases aus mit erhitztem Gas arbeitenden Trocknungsverfahren
DE4411691C1 (de) * 1994-04-06 1995-03-16 Rietbergwerke Gmbh & Co Kg Emulsionstrennverfahren
WO2001044123A1 (fr) * 1999-12-16 2001-06-21 Texaco Development Corporation Procede d'elimination de contaminants organiques et inorganiques des eaux residuaires au moyen de l'ultrafiltration et de l'osmose inverse
DE10244915A1 (de) * 2002-09-25 2004-04-08 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Filtrationsverfahren zur Separation polarer organischer Verbindungen, Filterkartusche und Filtrationseinheit sowie deren Verwendung
DE102006047681A1 (de) * 2006-10-09 2008-04-10 Lk Metallwaren Gmbh Verfahren und Vorrichtung zur Behandlung von Abwässern einer Metallgießerei
DE102009028162B4 (de) * 2009-07-31 2015-10-15 Eviola S.A. Wasseraufbereitung über Ultrafiltration
CN111499020A (zh) * 2020-04-15 2020-08-07 首钢京唐钢铁联合有限责任公司 冷轧废水处理装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168229A (en) * 1974-10-14 1979-09-18 Imperial Chemical Industries Limited Removal of oil from an oil in water emulsion
DE2528990A1 (de) * 1975-06-28 1977-01-27 Wolfgang Von Dr Ing Preen Verfahren zum spalten von oel-in- wasser emulsionen
DE2546579A1 (de) * 1975-10-17 1977-09-01 Wolfgang Von Dr Ing Preen Verfahren zum spalten von oel-in- wasser-emulsionen
US4111812A (en) * 1977-02-28 1978-09-05 Energy Resources Co. Inc. Recovering surfactant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9003332A1 *

Also Published As

Publication number Publication date
DE3831976A1 (de) 1990-03-29
EP0361201A1 (fr) 1990-04-04
WO1990003332A1 (fr) 1990-04-05

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Free format text: VERFAHREN ABGESCHLOSSEN INFOLGE VERBINDUNG MIT 89116862.7/0361201 (EUROPAEISCHE ANMELDENUMMER/VEROEFFENTLICHUNGSNUMMER) VOM 16.10.91.