EP0171602A2 - Aqueous coal dispersions - Google Patents

Aqueous coal dispersions Download PDF

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Publication number
EP0171602A2
EP0171602A2 EP85108549A EP85108549A EP0171602A2 EP 0171602 A2 EP0171602 A2 EP 0171602A2 EP 85108549 A EP85108549 A EP 85108549A EP 85108549 A EP85108549 A EP 85108549A EP 0171602 A2 EP0171602 A2 EP 0171602A2
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Prior art keywords
weight
dispersions
coal
formula
aqueous
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German (de)
French (fr)
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EP0171602A3 (en
EP0171602B1 (en
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Knut Dr. Oppenlaender
Karl Dr. Stork
Friedrich Dr. Hovemann
Erich Dr. Schwartz
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BASF SE
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
    • C10L1/326—Coal-water suspensions
    • 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
    • Y10S516/00—Colloid systems and wetting agents; subcombinations thereof; processes of
    • Y10S516/01—Wetting, emulsifying, dispersing, or stabilizing agents
    • 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
    • Y10S516/00—Colloid systems and wetting agents; subcombinations thereof; processes of
    • Y10S516/01—Wetting, emulsifying, dispersing, or stabilizing agents
    • Y10S516/03—Organic sulfoxy compound containing

Definitions

  • the invention relates to aqueous, if appropriate, methanol-containing pumpable and flowable coal dispersions with a special nonionic dispersant and the use of a special nonionic dispersant in coal-water dispersions.
  • Aqueous coal dispersions have become increasingly important in recent times, particularly with regard to their cheap transportation options, e.g. in pipelines.
  • aqueous carbon dispersions which contain higher molecular weight polyalkylene oxides as nonionic surface-active dispersants.
  • polyalkylene oxides of alkylphenols such as nonylphenoxypolyethylene oxide with more than a hundred ethylene oxide units.
  • the various surfactants do not prove to be particularly suitable in all cases, i.e. they are not applicable to all types of coal. Furthermore, the dispersants used to date are sometimes difficult to handle because they may have a very slow dissolution rate in water and partially concentrated aqueous solutions cannot be prepared.
  • DE-OS 27 45 449 and 27 51 519 show polyalkylene oxide derivatives of bisphenol A derivatives, in particular in sulfated form, as dispersants for disperse dyes and for optical brighteners which are sparingly or insoluble in water. 10 to 200% by weight of the dispersants mentioned are used, based on the amount of the dispersed substances. Such an amount is completely out of the question, for example, for aqueous coal dispersions.
  • the object of the present invention is to provide new dispersants for coal dispersions from different types of coal.
  • non-sulfated polyalkylene oxide bisphenol A derivatives are outstandingly suitable as dispersants for aqueous carbon dispersions.
  • the invention relates to aqueous, pumpable and flowable coal dispersions containing, based on the total weight, 65 to 80, preferably 70 to 75% by weight of ground coal, 35 to 20, preferably 30 to 25% by weight of water, of which 1 to 60% by weight may be replaced by methanol, and customary additives, characterized in that the dispersion contains 0.1 to 1.5, preferably 0.2 to 1.0% by weight. %, based on the total weight of the mixture, of a nonionic dispersant of the formula I. in R 1 the rest and R 2 to R 4 is a hydrogen atom or
  • Radical R 1 and x is 0 or a number from 5 to 400, preferably 50 to 200, and y is a number from 80 to 800, preferably 100 to 400, the propylene oxide / ethylene oxide blocks being interchanged or propylene oxide and ethylene oxide may be present in a statistical distribution and contain the use of compounds of the formula I as dispersants in aqueous carbon dispersions.
  • the coal dispersions according to the invention preferably contain a floated, ground coal with a suitable grain size distribution of less than 300 ⁇ .
  • coal with a high ash content is generally more difficult to disperse than coal with a low ash content.
  • High ash content means approx. 8 to 12%, lower ash content less than 4% ash.
  • the sulfur content of the preferably used floated coal is generally less than 1%.
  • the pumpable and flowable properties relate to the viscosity of the coal dispersion.
  • a dispersion with 2000 mPa.s is just barely flowable.
  • the desired values are 1000 mPa.s and below.
  • the optimally desired range can be specified with ⁇ 800 mPas. As shown in the examples, it is easily achieved in the coal dispersions according to the invention.
  • methanol As already mentioned, 1 to 60% by weight of the water can be replaced by methanol.
  • the addition of methanol serves for the purpose of lowering the viscosity, i.e. Better pumpability of the carbon dispersions at temperatures below 0'C, for example down to -20 ° C.
  • the dispersants of the formula I are known per se or can be prepared in a conventional manner by the processes described in DE-OS 27 45 449 and 27 51 519.
  • Particularly preferred dispersants of the formula I are those in which x 0 and y are 80 to 400 and in which x is 50 to 150 and y is 200 to 400.
  • aqueous coal dispersions are prepared in the customary manner.
  • a concentrated aqueous solution which contains 40 to 70% by weight of dispersant according to the invention and which, in contrast to some dispersants of the prior art, can be easily prepared, is added to the amount of water required which, with vigorous rotation, the ground coal and optionally further Additives are added.
  • the dispersant is dissolved in water and the coal is added with stirring with the aid of a pilot dissolver at about 1000 to 2000 rpm in the course of 3 minutes and then dispersed at 6500 rpm for 20 minutes.
  • the viscosity [mPa.s] is determined with a rotary viscometer at 20 ° C and a shear rate D of 220 s -1 .
  • the alkoxylated ethylenediamines are difficult to handle, and only 17% aqueous solutions can be prepared.
  • the dispersants according to the invention give 50 to 60% aqueous solutions without difficulty, which is a significant advantage for industrial handling.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Liquid Carbonaceous Fuels (AREA)

Abstract

Die Erfindung betrifft wäßrige, pumpbare und fließfähige Kohledispersionen mit einem speziellen nichtionischen Dispergiermittel, das ein Polyalkylenoxid-Bisphenol A-Derivat darstellt, sowie die Verwendung dieses speziellen nichtionischen Dispergiermittels in Kohle-Wasser-Dispersionen.The invention relates to aqueous, pumpable and flowable coal dispersions with a special nonionic dispersant, which is a polyalkylene oxide bisphenol A derivative, and the use of this special nonionic dispersant in coal-water dispersions.

Description

Die Erfindung betrifft wäßrige, gegebene falls methanolhaltige pumpbare und fließfähige Kohledispersionen mit einem spezitellen nichtionischen Dispergiermittel sowie die Verwendung eines speziellen nichtionischen Dispergiermittels in Kohle-Wasser-Dispersionen.The invention relates to aqueous, if appropriate, methanol-containing pumpable and flowable coal dispersions with a special nonionic dispersant and the use of a special nonionic dispersant in coal-water dispersions.

Wäßrige Kohledispersionen haben in neuerer Zeit zunehmend an Bedeutung gewonnen, insbesondere im Hinblick auf ihre günstigen Transportmöglichkeiten, z.B. in Pipelines.Aqueous coal dispersions have become increasingly important in recent times, particularly with regard to their cheap transportation options, e.g. in pipelines.

Aus der US-PS 4 358 293 sind wäßrige Kohledispersionen bekannt, die als nichtionische oberflächenaktive Dispergiermittel höhermolekulare Pσlyalkylenoxide enthalten. U.a. werden Polyalkylenoxide von Alkylphenolen, wie Nonylphenoxypolyethylenoxid mit mehr als hundert Ethylenoxideinheiten, beschrieben.From US Pat. No. 4,358,293, aqueous carbon dispersions are known which contain higher molecular weight polyalkylene oxides as nonionic surface-active dispersants. Among other things describe polyalkylene oxides of alkylphenols, such as nonylphenoxypolyethylene oxide with more than a hundred ethylene oxide units.

Die verschiedenen Tenside erweisen sich bei der Anwendung nicht in allen Fällen als besonders gut geeignet, d.h. sie sind nicht für alle Kohlearten anwendbar. Weiterhin sind die bisher verwendeten Dispergiermittel teilweise schwierig zu handhaben, da sie u.U. in Wasser eine sehr langsame Lösungsgeschwindigkeit aufweisen und teilweise konzentrierte wäßrige Lösungen nicht herstellbar sind.The various surfactants do not prove to be particularly suitable in all cases, i.e. they are not applicable to all types of coal. Furthermore, the dispersants used to date are sometimes difficult to handle because they may have a very slow dissolution rate in water and partially concentrated aqueous solutions cannot be prepared.

Aus den DE-OS 27 45 449 und 27 51 519 gehen Polyalkylenoxidderivate von Bisphenol A-Derivaten, insbesondere in sulfatierter Form, als Dispergiermittel für Dispersionsfarbstoffe und für in Wasser schwer oder unlöslichen optischen Aufhellern hervor. Dabei werden, bezogen auf die Menge der dispergierten Stoffe, 10 bis 200 Gew.% der genannten Dispergiermittel verwendet. Eine solche Menge ist beispielsweise für wäßrige Kohledispersionen völlig indiskutabel.DE-OS 27 45 449 and 27 51 519 show polyalkylene oxide derivatives of bisphenol A derivatives, in particular in sulfated form, as dispersants for disperse dyes and for optical brighteners which are sparingly or insoluble in water. 10 to 200% by weight of the dispersants mentioned are used, based on the amount of the dispersed substances. Such an amount is completely out of the question, for example, for aqueous coal dispersions.

Aufgabe der vorliegenden Erfindung ist es, neue Dispergiermittel für Kohledispersionen aus unterschiedlichen Kohletypen zur Verfügung zu stellen.The object of the present invention is to provide new dispersants for coal dispersions from different types of coal.

Es wurde nun gefunden, daß nichtsulfatierte Polyalkylenoxid-Bisphenol A--Derivate hervorragend als Dispergiermittel für wäßrige Kohledispersionen geeignet sind.It has now been found that non-sulfated polyalkylene oxide bisphenol A derivatives are outstandingly suitable as dispersants for aqueous carbon dispersions.

Demnach sind Gegenstand der Erfindung wäßrige, pumpbare und fließfähige Kohledispersionen enthaltend, jeweils bezogen auf das Gesamtgewicht, 65 bis 80, bevorzugt 70 bis 75 Gew.% gemahlene Kohle, 35 bis 20, bevorzugt 30 bis 25 Gew.% Wasser, von dem gegebenenfalls 1 bis 60 Gew.% durch Methanol ersetzt sind, und übliche Zusätze, dadurch gekennzeichnet, daß die Dispersion 0,1 bis 1,5, bevorzugt 0,2 bis 1,0 Gew.%, bezogen auf das Gesamtgewicht der Mischung, eines nichtionischen Dispergiermittels der Formel I

Figure imgb0001

in der R1 den Rest
Figure imgb0002
und R2 bis R4 ein Wasserstoffatom oder denAccordingly, the invention relates to aqueous, pumpable and flowable coal dispersions containing, based on the total weight, 65 to 80, preferably 70 to 75% by weight of ground coal, 35 to 20, preferably 30 to 25% by weight of water, of which 1 to 60% by weight may be replaced by methanol, and customary additives, characterized in that the dispersion contains 0.1 to 1.5, preferably 0.2 to 1.0% by weight. %, based on the total weight of the mixture, of a nonionic dispersant of the formula I.
Figure imgb0001
in R 1 the rest
Figure imgb0002
 and R 2 to R 4 is a hydrogen atom or

Rest R1 bedeuten und x 0 oder eine Zahl von 5 bis 400, bevorzugt 50 bis 200, und für y eine Zahl von 80 bis 800, bevorzugt 100 bis 400, stehen, wobei die Propylenoxid-Ethylenoxid-Blöcke miteinander vertauscht oder Propylenoxid und Ethylenoxid in statistischer Verteilung vorhanden sein können, enthalten sowie die Verwendung von Verbindungen der Formel I als Dispergiermittel in wäßrigen Kohledispersionen.Radical R 1 and x is 0 or a number from 5 to 400, preferably 50 to 200, and y is a number from 80 to 800, preferably 100 to 400, the propylene oxide / ethylene oxide blocks being interchanged or propylene oxide and ethylene oxide may be present in a statistical distribution and contain the use of compounds of the formula I as dispersants in aqueous carbon dispersions.

Die erfindungsgemäßen Kohledispersionen enthalten bevorzugt eine flotierte, gemahlene Kohle mit einer zweckmäßigen Korngrößenverteilung von kleiner 300 µ.The coal dispersions according to the invention preferably contain a floated, ground coal with a suitable grain size distribution of less than 300 μ.

Eine beispielhafte und besonders zweckmäßige Verteilung bedeutet 100 % kleiner 300 µ, 80 % kleiner 200 µ und 50 % kleiner 50 µ.An exemplary and particularly expedient distribution means 100% less than 300 µ, 80% less than 200 µ and 50% less than 50 µ.

Es ist selbstverständlich, daß Kohle mit einem hohen Aschegehalt in der Regel schwerer dispergiert werden kann als Kohle mit einem niederen Aschegehalt. Hoher Aschegehalt bedeutet ca. 8 bis 12 %, niederer Aschegehalt weniger als 4 % Asche. Der Schwefelgehalt der bevorzugt eingesetzten flotierten Kohle beträgt in der Regel weniger als 1 %.It goes without saying that coal with a high ash content is generally more difficult to disperse than coal with a low ash content. High ash content means approx. 8 to 12%, lower ash content less than 4% ash. The sulfur content of the preferably used floated coal is generally less than 1%.

Die Eigenschaften pumpbar und fließfähig betreffen die Viskosität der Kohledispersion. In der Regel ist eine Dispersion mit 2000 mPa.s gerade noch fließfähig. Für die Praxis, damit mit möglichst geringem Energieaufwand transportiert werden kann, liegen die gewünschten Werte bei 1000 mPa.s und darunter. Der optimal gewünschte Bereich kann mit < 800 mPas angegeben werden. Er wird, wie in den Beispielen gezeigt, in den erfindungsgemäßen Kohledispersionen ohne weiteres erreicht.The pumpable and flowable properties relate to the viscosity of the coal dispersion. As a rule, a dispersion with 2000 mPa.s is just barely flowable. In practice, in order to be able to transport with as little energy expenditure as possible, the desired values are 1000 mPa.s and below. The optimally desired range can be specified with <800 mPas. As shown in the examples, it is easily achieved in the coal dispersions according to the invention.

Wie bereits erwähnt, können 1 bis 60 Gew.% des Wassers durch Methanol ersetzt werden. Der Zusatz von Methanol dient zum Zwecke der Viskositätserniedrigung, d.h. bessere Pumpbarkeit, der Kohledispersionen bei Temperaturen unter 0'C beispielsweise bis zu -20°C.As already mentioned, 1 to 60% by weight of the water can be replaced by methanol. The addition of methanol serves for the purpose of lowering the viscosity, i.e. Better pumpability of the carbon dispersions at temperatures below 0'C, for example down to -20 ° C.

Darüberhinaus enthalten die erfindungsgemäßen Kohledispersionen die dem Fachmann an sich bekannten üblichen Zusätze:

  • Schaumdämpfer, an sich übliche Schaumdämpfer wie Fettsäurepolyalkoxylate, z.B. Stearylalkoholpropoxylat mit 10 bis 50 Propylenoxideinheiten oder Silikonöle etc.; als Viskositätsregler lösliche anorganische Salze, z.B. Ammoniumchlorid und -carbonat, Alkali- and Erdalkali-chloride und -earbonate, insbesondere des Natriums sowie Calciums und Magnesiums, wasserlösliche Phosphate und Silicate, wie Natrium-hexametaphosphat oder Natrium--metasilikat-9-hydrat; pH-Wert-Regulatoren, da für die praktische Anwendung ein pH-Wert von 8 bis 10 besonders zweckmäßig ist, wie Alkali- und Erdalkalihydroxide, Ammoniak sowie primäre und sekundäre Amine, Stabilisierhilfsmittel mit Schutzkolloid- und/oder Verdickerwirkung, hierfür kommen in Betracht Polyether (z.B. Polyethylenoxid, Copolymere von Polyethylenoxid und Polypropylenoxid), Carboxymethylcellulose, Hydroxyethylcellulose, Polysaccharide (z.B. Alginate), Polyalkohole, Polyacrylate und Copolymere davon; als übliche Zusätze seien auch Biocide genannt.
In addition, the coal dispersions according to the invention contain the usual additives known per se to the person skilled in the art:
  • Foam damper, conventional foam damper such as fatty acid polyalkoxylates, for example stearyl alcohol propoxylate with 10 to 50 propylene oxide units or silicone oils, etc .; as viscosity regulators soluble inorganic salts, for example ammonium chloride and carbonate, alkali and alkaline earth chlorides and arbonates, in particular sodium and calcium and magnesium, water-soluble phosphates and silicates, such as sodium hexametaphosphate or sodium metasilicate 9-hydrate; pH regulators, since a pH value of 8 to 10 is particularly expedient for practical use, such as alkali and alkaline earth metal hydroxides, ammonia and primary and secondary amines, stabilizing aids with protective colloid and / or thickening action, polyethers are suitable for this (eg polyethylene oxide, copolymers of polyethylene oxide and polypropylene oxide), carboxymethyl cellulose, hydroxyethyl cellulose, polysaccharides (eg alginates), polyalcohols, polyacrylates and copolymers thereof; Biocides may also be mentioned as conventional additives.

Die Dispergiermittel der Formel I sind an sich bekannt oder können nach den in den DE-OS 27 45 449 und 27 51 519 beschriebenen Verfahren in an sich üblicher Weise hergestellt worden.The dispersants of the formula I are known per se or can be prepared in a conventional manner by the processes described in DE-OS 27 45 449 and 27 51 519.

Besonders bevorzugte Dispergiermittel der Formel I sind solche, in denen x 0 und y 80 bis 400 und in denen x 50 bis 150 und y 200 bis 400 bedeuten.Particularly preferred dispersants of the formula I are those in which x 0 and y are 80 to 400 and in which x is 50 to 150 and y is 200 to 400.

Die Herstellung der wäßrigen Kohledispersionen erfolgt in üblicher Weise. In der Regel wird eine konzentrierte wäßrige Lösung, die 40 bis 70 Gew.% erfindungsgemäßes Dispergiermittel enthält und die sich im Gegensatz zu manchen Dispergiermitteln des Standes der Technik leicht herstellen läßt, der erforderlichen Wassermenge zugegeben, der unter starker Rotation die gemahlene Kohle und gegebenenfalls weitere Zusätze zugeführt werden.The aqueous coal dispersions are prepared in the customary manner. As a rule, a concentrated aqueous solution which contains 40 to 70% by weight of dispersant according to the invention and which, in contrast to some dispersants of the prior art, can be easily prepared, is added to the amount of water required which, with vigorous rotation, the ground coal and optionally further Additives are added.

BeispieleExamples I Herstellung von Dispergiermitteln der Formel II Preparation of dispersants of the formula I.

  • a) 228 g (1 Mol) 4,4'-Dihydroxy-diphenyl-dimethyl-methan, 104 g (1 Mol) Styrol und 1,66 g p-Toluolsulfonsäure als Katalysator werden bei Raumtemperatur vermischt und anschließend erwärmt. Bei ca. 60°C erfolgt die exotherme Reaktion und Temperaturanstieg auf 120 bis 130°C. Bei dieser Temperatur können gegebenenfalls weitere 1 bis 3 Mol Styrol innerhalb von ca. 2 Stunden zugetropft werden. Es wird noch 1 Stunde zur Vervollständigung der Reaktion bei 130°C nachgerührt. Es wird ein rotbraunes, viskoses öl erhalten, die Ausbeute ist quantitativ.a) 228 g (1 mol) of 4,4'-dihydroxy-diphenyl-dimethyl-methane, 104 g (1 mol) of styrene and 1.66 g of p-toluenesulfonic acid as a catalyst are mixed at room temperature and then heated. At about 60 ° C, the exothermic reaction and temperature rise to 120 to 130 ° C. At this temperature, a further 1 to 3 mol of styrene can optionally be added dropwise within about 2 hours. The mixture is stirred at 130 ° C for 1 hour to complete the reaction. A red-brown, viscous oil is obtained, the yield is quantitative.
  • b) Das aus der Stufe a) erhaltene Produkt wird mit 1 Gew.% Kaliumhydroxid versetzt und unter Rühren werden bei 120 bis 130°C portionsweise Propylenoxid und Ethylenoxid, gegebenenfalls in umgekehrter Reihenfolge, so aufgepreßt, daß der Druck 8 bar nicht übersteigt.b) The product obtained from stage a) is mixed with 1% by weight of potassium hydroxide and, with stirring, propylene oxide and ethylene oxide are injected in portions at 120 to 130 ° C., optionally in the reverse order, so that the pressure does not exceed 8 bar.
II AnwendungsbeispieleII Examples of use

Zusammensetzung der Kohle-Wasser-Dispersionen:

  • 70 Gew.X polnische Importkohle (Steinkohle, flotiert, gemahlen)
  • 0,5 Gew.% Dispergiermittel der Formel I gemäß Tabelle 1
  • 29,5 Gew.% Wasser
Composition of the coal-water dispersions:
  • 70% by weight Polish imported coal (hard coal, floated, ground)
  • 0.5% by weight of dispersant of the formula I according to Table 1
  • 29.5% by weight of water

Das Dispergiermittel wird im Wasser gelöst und die Kohle unter Rühren unter Zuhilfenahme eines Technikumdissolvers bei ca. 1000 bis 2000 U/min innerhalb von 3 min zugegeben und anschließend bei 6500 U/min 20 min lang dispergiert.The dispersant is dissolved in water and the coal is added with stirring with the aid of a pilot dissolver at about 1000 to 2000 rpm in the course of 3 minutes and then dispersed at 6500 rpm for 20 minutes.

Die Viskosität [mPa.s] wird mit einem Rotationsviskosimeter bestimmt bei 20°C und einer Schergeschwindigkeit D von 220 s-1.

Figure imgb0003
The viscosity [mPa.s] is determined with a rotary viscometer at 20 ° C and a shear rate D of 220 s -1 .
Figure imgb0003

Aus der Tabelle geht hervor, daß ein Vergleich mit Dispergiermitteln aus der US-PS 4 358 293 durchgeführt wurde:The table shows that a comparison was made with dispersants from US Pat. No. 4,358,293:

Der Vergleich zeigt, daß mit alkoxyliertem Ethylendiamin und Nonylphenol brauchbare Werte erreicht werden, die Dispergiermittel der Formel I jedoch stets günstiger liegen.The comparison shows that useful values are achieved with alkoxylated ethylenediamine and nonylphenol, but the dispersants of the formula I are always more favorable.

Die alkoxylierten Ethylendiamine lassen sich bekanntermaßen schlecht handhaben, nur 17 %ige wäßrige Lösungen sind herstellbar.As is known, the alkoxylated ethylenediamines are difficult to handle, and only 17% aqueous solutions can be prepared.

Die erfindungsgemäßen Dispergiermittel ergeben ohne Schwierigkeiten 50 bis 60 %ige wäßrige Lösungen, was für die technische Handhabung einen wesentlichen Vorteil darstellt.The dispersants according to the invention give 50 to 60% aqueous solutions without difficulty, which is a significant advantage for industrial handling.

Claims (4)

1. Wäßrige, pumpbare und fließfähige Kohledispersionen, enthaltend, jeweils bezogen auf das Gesamtgewicht, 65 bis 80 Gew.X gemahlene Kohle, 35 bis 20 Gew.X Wasser, von denen gegebenenfalls 1 bis 60 Gew.% durch Methanol ersetzt sind, und übliche Zusätze, dadurch gekennzeichnet, daß die Dispersion 0,1 bis 1,5 Gew.X, bezogen auf das Gesamtgewicht der Mischung, eines nichtionischen Dispergiermittels der Formel I
Figure imgb0004
in der R1 den Rest
Figure imgb0005
und R2 bis R4 ein Wasserstoffatom oder den Rest R1 bedeuten und für x 0 oder eine Zahl von 5 bis 400 und für y eine Zahl von 80 bis 800 stehen, wobei die Propylenoxid-Ethylenoxid--Blöcke miteinander vertauscht oder Propylenoxid und Ethylenoxid in statistischer Verteilung vorhanden sein können.1. Aqueous, pumpable and flowable coal dispersions containing, in each case based on the total weight, 65 to 80% by weight of ground coal, 35 to 20% by weight of water, of which 1 to 60% by weight may be replaced by methanol, and customary Additives, characterized in that the dispersion contains 0.1 to 1.5% by weight, based on the total weight of the mixture, of a nonionic dispersant of the formula I.
Figure imgb0004
in R 1 the rest
Figure imgb0005
 and R 2 to R 4 represent a hydrogen atom or the radical R 1 and stand for x 0 or a number from 5 to 400 and for y a number from 80 to 800, the propylene oxide-ethylene oxide blocks being interchanged or propylene oxide and ethylene oxide can be present in statistical distribution. 2. Wäßrige Kohledispersionen nach Anspruch 1, dadurch gekennzeichnet, daß in dem Dispergiermittel der Formel I x 0 und y eine Zahl von 80 bis 400 oder x eine Zahl von 50 bis 150 und y eine Zahl von 200 bis 400 bedeuten.2. Aqueous carbon dispersions according to claim 1, characterized in that in the dispersant of the formula I x 0 and y is a number from 80 to 400 or x is a number from 50 to 150 and y is a number from 200 to 400. 3. Wäßrige Kohledispersionen nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Dispersionen 0,2 bis 1 Gew.%, bezogen auf das Gesamtgewicht der Mischung, eines nichtionischen Dispergiermittels der Formel I enthalten.3. Aqueous carbon dispersions according to claim 1 or 2, characterized in that the dispersions contain 0.2 to 1% by weight, based on the total weight of the mixture, of a nonionic dispersant of the formula I. 4. Verwendung von Verbindungen der Formel I als Dispergiermittel in wäßrigen Kohledispersionen in einer Menge von 0,1 bis 1,5 Gew.%, bezogen auf das Gesamtgewicht der Mischung.4. Use of compounds of the formula I as dispersants in aqueous carbon dispersions in an amount of 0.1 to 1.5% by weight, based on the total weight of the mixture.
EP85108549A 1984-07-18 1985-07-10 Aqueous coal dispersions Expired EP0171602B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3426395A DE3426395A1 (en) 1984-07-18 1984-07-18 AQUEOUS COAL DISPERSIONS
DE3426395 1984-07-18

Publications (3)

Publication Number Publication Date
EP0171602A2 true EP0171602A2 (en) 1986-02-19
EP0171602A3 EP0171602A3 (en) 1988-01-20
EP0171602B1 EP0171602B1 (en) 1989-10-25

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EP85108549A Expired EP0171602B1 (en) 1984-07-18 1985-07-10 Aqueous coal dispersions

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US (1) US4675025A (en)
EP (1) EP0171602B1 (en)
JP (1) JPS6143698A (en)
AU (1) AU573364B2 (en)
CA (1) CA1260709A (en)
DE (2) DE3426395A1 (en)
ZA (1) ZA855380B (en)

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DE3707941A1 (en) * 1987-03-12 1988-09-22 Henkel Kgaa DISPERSING AGENTS AND THEIR USE IN AQUEOUS CARBON SUSPENSIONS
US5266989A (en) * 1988-10-06 1993-11-30 Nikon Corporation Camera which can be used for trimming shots
JP2753531B2 (en) * 1988-11-04 1998-05-20 株式会社ニコン Auto focus camera
US5270755A (en) * 1990-05-01 1993-12-14 Ricoh Company, Ltd. Trimming information recordable camera
JPH07175119A (en) * 1990-05-01 1995-07-14 Ricoh Co Ltd Camera capable of trimming photographing
JPH06337469A (en) * 1993-05-31 1994-12-06 Canon Inc Camera with pseudotelescope

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EP0071861A1 (en) * 1981-08-01 1983-02-16 Hoechst Aktiengesellschaft Dispersing agents, process for their preparation and their use
EP0108302A2 (en) * 1982-10-30 1984-05-16 Bayer Ag Use of arylalkyl-polyalkylene glycol ethers in the preparation of aqueous coal slurries

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DE2745449C2 (en) * 1977-10-08 1979-10-25 Basf Ag, 6700 Ludwigshafen Stable finely divided aqueous preparations of disperse dyes and optical brighteners and their use
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Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
EP0071861A1 (en) * 1981-08-01 1983-02-16 Hoechst Aktiengesellschaft Dispersing agents, process for their preparation and their use
EP0108302A2 (en) * 1982-10-30 1984-05-16 Bayer Ag Use of arylalkyl-polyalkylene glycol ethers in the preparation of aqueous coal slurries

Also Published As

Publication number Publication date
CA1260709A (en) 1989-09-26
DE3573928D1 (en) 1989-11-30
AU4511385A (en) 1986-01-23
ZA855380B (en) 1986-03-26
AU573364B2 (en) 1988-06-02
US4675025A (en) 1987-06-23
DE3426395A1 (en) 1986-01-23
JPS6143698A (en) 1986-03-03
EP0171602A3 (en) 1988-01-20
EP0171602B1 (en) 1989-10-25

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