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EP0642651B1 - Procede de deshydratation de suspensions de matieres solides finement divisees - Google Patents

Procede de deshydratation de suspensions de matieres solides finement divisees Download PDF

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Publication number
EP0642651B1
EP0642651B1 EP93912772A EP93912772A EP0642651B1 EP 0642651 B1 EP0642651 B1 EP 0642651B1 EP 93912772 A EP93912772 A EP 93912772A EP 93912772 A EP93912772 A EP 93912772A EP 0642651 B1 EP0642651 B1 EP 0642651B1
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EP
European Patent Office
Prior art keywords
dialkyl carbonates
suspensions
auxiliaries
dewatering
formula
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
EP93912772A
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German (de)
English (en)
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EP0642651A1 (fr
Inventor
Rita Köster
Alfred Westfechtel
Walter KNÖRR
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
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/005—Drying solid materials or objects by processes not involving the application of heat by dipping them into or mixing them with a chemical liquid, e.g. organic; chemical, e.g. organic, dewatering aids
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S210/00—Liquid purification or separation
    • Y10S210/928—Paper mill waste, e.g. white water, black liquor treated

Definitions

  • the invention relates to a process for dewatering finely divided solid dispersions, in which dialkyl carbonates are used as auxiliaries.
  • suspensions are suitable as auxiliaries for the dewatering of water-containing fine-particle solid suspensions, in particular iron ore concentrates, quartz sands or hard coal, by means of which the residual moisture can be reduced.
  • Dialkylsulfosuccinates [US Pat. No. 2,266,954 ] and nonionic surfactants of the fatty alcohol polyglycol ether type [Erzmetall 30, 292 (1977)] have been described, for example, as surfactant dewatering aids of the type mentioned above.
  • these surfactants have the disadvantage of considerable foam formation, which leads to considerable problems in the processing plants, in particular when water is circulated in the usual way.
  • German published patent application DE-A1-39 18 274 discloses alkyl-end group-capped ⁇ -hydroxyalkyl ethers, so-called hydroxy mixed ethers, which are prepared by ring opening of alpha-olefin epoxides with fatty alcohol ethoxylates and are used as low-foaming auxiliaries in the dewatering of solid suspensions. Although good results are obtained with these agents in solids dewatering, they have the disadvantage of unsatisfactory cold behavior. Particularly when stored outdoors, crystals can form at temperatures of 10 to 15 ° C, which significantly impairs the pumping and flow behavior of these products and thus their intended use.
  • EP-A-0 444 760 discloses a drainage agent which releases a polyethylene carbonate of the following structural formula: where R3 is an ackyl radical with 7 to 16 carbon atoms and q is a number from 7 to 16.
  • the object of the invention was therefore to provide a process for the dewatering of solid suspensions which is free from the disadvantages described.
  • dialkyl carbonates to be used according to the invention have a significantly better foaming and cooling behavior, in particular lower pour points, with comparably good, e.g. T. even have slightly improved application properties.
  • Dialkyl carbonates are known substances which can be obtained by the relevant methods of preparative organic chemistry. For their preparation, it is possible, for example, to start from dimethyl carbonate, but preferably diethyl carbonate, and subject them to a transesterification with an appropriate alcohol or alcohol ethoxylate in the presence of basic catalysts [ see. Houben-Weyl, Methods of Organic Chemistry, 4. Ed., Vol.E4, p.66ff].
  • Suitable dialkyl carbonates for the purposes of the invention are, for example, mono- and di-transesterification products of dimethyl carbonate and in particular diethyl carbonate with saturated and / or unsaturated primary alcohols with 6 to 22 carbon atoms and their adducts with 1 to 10 moles of ethylene oxide.
  • dialkyl carbonates of the formula (I) are preferred in which R 1 is alkyl radicals having 8 to 18 carbon atoms, R is alkyl radicals having 2 or 8 to 18 carbon atoms and n and m are 0 or numbers from 2 to 7 stand.
  • Dialkyl carbonates which have a short and a long alkyl group for example mono-transesterification products of diethyl carbonate, have proven to be particularly advantageous.
  • the dialkyl carbonates of the formula (I) must be water-dispersible. It is possible that there is no satisfactory water dispersibility in cases in which low values of the degree of ethoxylation are opposed by n or m long-chain radicals R 1 and / or R. However, the required water dispersibility can be easily achieved by using the Value for n or m increased within the above range.
  • dialkyl carbonates to be used according to the invention can be used individually; for the dewatering of certain solids, however, it can be advantageous to combine products of different chain lengths or different degrees of ethoxylation with one another in order to exploit synergies in their physicochemical properties. In the same way, it can be advantageous to use the internal hydroxy mixed ethers in combination with other known ionic and / or nonionic drainage aids.
  • dialkyl carbonates to be used according to the invention support the dewatering of solid suspensions, are readily biodegradable, have little foam and are characterized by low pour points. They are therefore suitable for dewatering suspensions of various solids, such as iron ore concentrates, quartz sand, hard coal or coke. Another important area of application is the use of the dialkyl carbonates to be used according to the invention as aids in the dewatering of solid suspensions which are used in waste paper processing, e.g. B. in the deinking process or filler flotation.
  • the dialkyl carbonates are used in amounts of 10 to 500, preferably 100 to 400 and in particular 150 to 350 g, based on solids content, per ton of solid.
  • DAC Dialkyl carbonates
  • composition DAC R1 n R m A1 n-C8 2nd n-C8 2nd A2 n-C8 4th n-C8 4th A3 n-C8 4th C2 0 A4 nC 12/14 2nd nC 12/14 2nd A5 nC 12/14 4th nC 12/14 4th A6 nC 12/18 2nd nC 12/18 2nd A7 nC 12/18 7 nC 12/18 7 A8 i-C13 3rd i-C13 3rd A9 nC 16/18 5 nC 16/18 5 A10 nC 16/18 * 5 nC 16/18 * 5 nC 16/18 * 5 nC 16/18 * 5
  • the tests were carried out in a cup centrifuge, with which centrifuge parameters from 15 to 2000 can be achieved.
  • Perforated plates with sieve openings of 0.1 x 2 mm were used as the sieve covering.
  • the drainage aids were used in aqueous solutions; all concentration data are based on the solids content of these solutions.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Paper (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

La deshydratation de suspensions de matières solides finement divisées est réalisée en utilisant comme produits auxiliaires des dialkylcarbonates ayant la formule (I), dans laquelle R1 et R2 désignent, indépendamment l'un de l'autre, un reste alkyle et/ou alkényle de 1 à 22 atomes de carbone, et m et n sont, indépendamment l'un de l'autre, égaux à 0 ou compris entre 1 et 10. Ces produits auxiliaires sont facilement biodégradables, très faiblement moussants et sont remarquables par le fait qu'ils présentent un bas point de solidification.

Claims (5)

  1. Procédé de déshydratation de suspensions de matières solides à fines particules, dans lequel on utilise comme adjuvants des dialkylcarbonates de la formule (I),
    Figure imgb0007
     dans laquelle
    R¹ et R   représentent indépendamment l'un de l'autre des radicaux alkyle et/ou alcényle comportant 1 à 22 atomes de carbone et
    m et n   représentent indépendamment l'un de l'autre 0 ou des nombres de 1à 10.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on utilise des dialkylcarbonates de la formule (I), dans laquelle R¹ représente un radical alkyle comportant 8 à 18 atomes de carbone, R correspond à un radical alkyle possédant 2 ou 8 à 18 atomes de carbones et n et m sont égaux à 0 ou à un nombre de 2 à 7.
  3. Procédé selon la revendication 1, caractérisé en ce que l'on déshydrate des suspensions de concentrés de minerai de fer, de sable siliceux, de houille ou de coke.
  4. Procédé selon la revendication 1, caractérisé en ce que l'on utilise des dialkylcarbonates en quantités de 10 à 500 g par tonne de matière solide.
  5. Utilisation de dialkylcarbonates de la formule (I) comme adjuvants pour la déshydratation de suspensions de matières solides à fines particules, en particulier pour le retraitement des vieux papiers.
EP93912772A 1992-06-01 1993-05-24 Procede de deshydratation de suspensions de matieres solides finement divisees Expired - Lifetime EP0642651B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4218074 1992-06-01
DE4218074A DE4218074A1 (de) 1992-06-01 1992-06-01 Verfahren zur Entwässerung von feinteiligen Feststoffsuspensionen
PCT/EP1993/001298 WO1993024799A1 (fr) 1992-06-01 1993-05-24 Procede de deshydratation de suspensions de matieres solides finement divisees

Publications (2)

Publication Number Publication Date
EP0642651A1 EP0642651A1 (fr) 1995-03-15
EP0642651B1 true EP0642651B1 (fr) 1996-02-14

Family

ID=6460165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93912772A Expired - Lifetime EP0642651B1 (fr) 1992-06-01 1993-05-24 Procede de deshydratation de suspensions de matieres solides finement divisees

Country Status (7)

Country Link
US (1) US5492631A (fr)
EP (1) EP0642651B1 (fr)
CA (1) CA2137139A1 (fr)
DE (2) DE4218074A1 (fr)
FI (1) FI945644A0 (fr)
WO (1) WO1993024799A1 (fr)
ZA (1) ZA933798B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5777178A (en) * 1996-12-18 1998-07-07 Olin Corporation Process for the preparation of polyoxyalkylene ether surfactant compositions
US6375853B1 (en) * 2000-03-17 2002-04-23 Roe-Hoan Yoon Methods of using modified natural products as dewatering aids for fine particles
DE102007027371A1 (de) * 2007-06-11 2008-12-18 Cognis Oleochemicals Gmbh Verfahren zur Herstellung einer Verbindung aufweisend mindestens eine Ester-Gruppe
DE102007027372A1 (de) * 2007-06-11 2008-12-18 Cognis Oleochemicals Gmbh Verfahren zur Hydrierung von Glycerin
WO2011032253A1 (fr) 2009-09-15 2011-03-24 Suncor Energy Inc. Procédé de séchage de résidus fins mûrs de sables pétrolifères
CA2936031C (fr) 2009-09-15 2019-09-03 Adrian Peter Revington Techniques de floculation et de deshydratation de residus fins
CA2735330C (fr) 2009-10-30 2015-06-02 Suncor Energy Inc. Procedes de sedimentation et de traitement agricole pour le sechage de residus fins
US10238106B2 (en) * 2014-03-12 2019-03-26 Basf Se Carbonates of alcohol alkoxylates as adjuvants for crop protection

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2266954A (en) * 1939-08-26 1941-12-23 American Cyanamid Co Wetting agent in settling of oe pulps
US4098686A (en) * 1976-03-19 1978-07-04 Vojislav Petrovich Froth flotation method for recovering of minerals
DE3723323C2 (de) * 1987-07-15 1998-03-12 Henkel Kgaa Hydroxy-Mischether, Verfahren zu deren Herstellung sowie deren Verwendung
EP0417358A1 (fr) * 1989-09-12 1991-03-20 Du Pont-Mitsui Fluorochemicals Co., Ltd Composition de solvant pour la déshydratation
DE3918274A1 (de) * 1989-06-05 1990-12-06 Henkel Kgaa Verwendung von hydroxymischethern als hilfsmittel fuer die feststoffentwaesserung
US5229017A (en) * 1990-03-01 1993-07-20 Dowell Schlumberger Incorporated Method of enhancing methane production from coal seams by dewatering

Also Published As

Publication number Publication date
CA2137139A1 (fr) 1993-12-02
DE59301648D1 (de) 1996-03-28
FI945644A7 (fi) 1994-11-30
WO1993024799A1 (fr) 1993-12-09
US5492631A (en) 1996-02-20
DE4218074A1 (de) 1993-12-02
ZA933798B (en) 1993-12-22
FI945644L (fi) 1994-11-30
EP0642651A1 (fr) 1995-03-15
FI945644A0 (fi) 1994-11-30

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