EP0118440B1 - Kohle-wasser-dispersion und verfahren zu deren herstellung - Google Patents

Kohle-wasser-dispersion und verfahren zu deren herstellung Download PDF

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Publication number
EP0118440B1
EP0118440B1 EP82903239A EP82903239A EP0118440B1 EP 0118440 B1 EP0118440 B1 EP 0118440B1 EP 82903239 A EP82903239 A EP 82903239A EP 82903239 A EP82903239 A EP 82903239A EP 0118440 B1 EP0118440 B1 EP 0118440B1
Authority
EP
European Patent Office
Prior art keywords
coal
dispersion
water
lecithin
particles
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
Application number
EP82903239A
Other languages
English (en)
French (fr)
Other versions
EP0118440A1 (de
Inventor
Lars Lennart Stigsson
Björn LINDMAN
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.)
Fluidcarbon International AB
Original Assignee
Fluidcarbon International AB
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
Priority claimed from PCT/SE1982/000107 external-priority patent/WO1983000500A1/en
Application filed by Fluidcarbon International AB filed Critical Fluidcarbon International AB
Publication of EP0118440A1 publication Critical patent/EP0118440A1/de
Application granted granted Critical
Publication of EP0118440B1 publication Critical patent/EP0118440B1/de
Expired legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to the manufacture of a coal-water dispersion which is very stable in storage and is suitable for transport and direct energy production without preceding dewatering. More particularly the invention relates to the manufacture of a dispersion comprising water, pulverized coal and additives including polymers, the coal content amounting to at least 60% by weight.
  • a dispersion of coal is considerably less polluting and can be more easily handled than solid coal and also eliminates some risks involved in transport and storage. Such a dispersion is also preferred from an economical point of view.
  • Physical conversion is another method of transferring the coal into liquid form, and the invention relates to this method. It is practised by dispersing the coal in a liquid which may consist of water as in the case of the dispersion of the invention, or of some organic fuel such as heating oil, methanol, etc.
  • the main problem of water dispersion of pulverized coal is to make the dispersion stable at low viscosity.
  • the coal particles must not sediment during storage or transport of the coal-water dispersion.
  • the coal-water dispersion shall have a high pumpability and shall have rheological properties so as to be suitable for burning by conventional technique probably modified to a minor degree.
  • anionic surfactants and at least one electrolyte among other additives are used to prevent sedimentation and improve rheology. Tests have shown that the sedimentation stability as well as the rheological properties do not satisfy the desired demands.
  • EP-A-0,041,337 describes dispersions containing water and 65% by weight of powdered coal and as a dispersing agent a quaternary ammonium synthetic polymer.
  • the invention relates to a method of manufacturing a dispersion containing water and pulverized coal, the coal content ranging from 60 to 85% by weight, and further including at least one polymer containing segments of hydrophobic as well as hydrophilic character, and lecithin which is adsorbed to the surfaces of the coal particles and provides repulsion between the coal particles by hydration forces, said polymer co-operating with the lecithin, and according to the invention this method has obtained the characterizing features appearing from claim 1.
  • the dispersion obtained by the method has rheological properties which allow the dispersion to be pumped and transported through pipelines at a greatly reduced friction, and above all has a considerably improved stability against flocculation as well as sedimentation.
  • the dispersion moreover has such properties that it can be atomized without forming agglomerates in a suitable burner equipment.
  • the force is of a general character and does not vary with the length of the alkyl chain or with the physical condition of the chains (liquid or solid) and is present also when a quantity charged surface-active substance is included into the system. Hydration forces have been proved also by directly measuring the forces between surfaces mutually spaced some Angstrom. Atheoret- ical model for hydration forces has recently been developed, and then it has been possible to relate these forces to the presence of so-called mirror charges over interfaces where the effective dielectric constant is being changed. Such mirror charges with zwitterionic groups should be common in micro- and macro-heterogeneous systems. They are utilized according to the present invention in order to impart desired properties to a suspension of a low dielectric substance in a high dielectric medium. Then, a zwitterionic surface-active substance such as lecithin can be adsorbed onto the surfaces of the solid particles. Strong repulsion forces between the particles then exist at short distances. The principle therefore will be particularly useful for concentrated dispersions.
  • Another possibility according to the invention includes addition of oil to the slurry (0-10%) either in the pulverization step or later to improve flame stability when the slurry is being burnt, especially in small scale applications.
  • hydrophilic anionic or non-ionic polymers may be added to the dispersion in order to provide some form of a steric barrier and in order to reduce the friction between the particles.
  • hydrophilic anionic or non-ionic polymers may be added to the dispersion in order to provide some form of a steric barrier and in order to reduce the friction between the particles.
  • polyethers polysaccharides, polyalcohols and polyacrylates.
  • Particularly suitable according to the invention are polyethyleneoxide, copolymers of the polyethyleneoxide-polypropyleneoxide type, carboxymethylcellulose, xanthan gum, and polymers of the type block or graft copolymers with balanced hydrophilic- lipophilic content.
  • concentration of polymers in percent by weight based on the total weight can be varied between 0.1 and 5% but is economically optimal at about 0.5%.
  • the salt is calcium hydroxide or dolomite powder.
  • the salt neutralizes acid gas components generated at the oxidation of the fuel and can be recovered in a particle precipitator.
  • an agent can be added to the dispersion which forms a monomolecular layer in the interface.
  • an agent is cetyl alcohol or hexadecanol.
  • the invention provides substantial advantages over the prior art technique of stabilizing coal particles in water. Due to an excellent sedimentation stability combined with favourable rheological properties for pumping, the dispersion obtained is well suited for transporting coal in an appropriate manner in conduits or pipelines for use for example in the chemical industry or for direct energy production.

Landscapes

  • 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)
  • Colloid Chemistry (AREA)
  • Liquid Carbonaceous Fuels (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)

Claims (2)

1. Verfahren zur Herstellung einer Dispersion, die Wasser und pulverisierte Kohle enthält, wobei der Kohlegehalt im Bereich von 60 bis 85 Gew.-% liegt, und die darüberhinaus zumindest ein Polymer, das sowohl Segmente von hydrophobem als auch hydrophilem Charakter enthält, und Lecithin einschließt, das auf den Oberflächen der Kohlepartikel adsorbiert ist und durch die Hydratationskräfte die Abstoßung zwischen den Kohlepartikeln schafft, wobei dieses Polymer mit dem Lecithin kooperiert, dadurch gekennzeichnet, daß das Lecithin mittels eines organischen Salzes, z.B. eines Alkalisalzes einer Fettsäure oder einem Alkalisorbat in Wasser gelöst der pulverisierten Kohle zugeführt wird.
2. Verfahren nach Anspruch 1, worin die feste Kohle durch Naßmahlung pulverisiert wird und danach aufbereitet und entwässert wird, dadurch gekennzeichnet, daß das Lecithin im Mahl- oder Aufbereitungsverfahren oder nach dem Entwässerungsverfahren zugegeben wird.
EP82903239A 1982-04-05 1982-11-12 Kohle-wasser-dispersion und verfahren zu deren herstellung Expired EP0118440B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/SE1982/000107 WO1983000500A1 (en) 1981-08-03 1982-04-05 Coal-water dispersion
WOPCT/SE82/00107 1982-04-05

Publications (2)

Publication Number Publication Date
EP0118440A1 EP0118440A1 (de) 1984-09-19
EP0118440B1 true EP0118440B1 (de) 1988-03-02

Family

ID=20345679

Family Applications (2)

Application Number Title Priority Date Filing Date
EP82903239A Expired EP0118440B1 (de) 1982-04-05 1982-11-12 Kohle-wasser-dispersion und verfahren zu deren herstellung
EP83900669A Withdrawn EP0105878A1 (de) 1982-04-05 1983-02-04 Kohlen-wasserdispersion und deren herstellungsverfahren

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP83900669A Withdrawn EP0105878A1 (de) 1982-04-05 1983-02-04 Kohlen-wasserdispersion und deren herstellungsverfahren

Country Status (11)

Country Link
EP (2) EP0118440B1 (de)
JP (1) JPS59500520A (de)
AU (1) AU1223183A (de)
BR (1) BR8306789A (de)
CA (1) CA1216425A (de)
DK (1) DK558483D0 (de)
ES (1) ES519418A0 (de)
FI (1) FI834462A (de)
IT (1) IT1207967B (de)
NO (1) NO834432L (de)
WO (2) WO1983003617A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983003617A1 (en) * 1982-04-05 1983-10-27 Stigsson, Lars, Lennart Coal-water dispersion and method of the manufacture thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983000500A1 (en) * 1981-08-03 1983-02-17 Stigsson, Lars, Lennart Coal-water dispersion
WO1983003618A1 (en) * 1982-04-05 1983-10-27 Fluidcarbon International Ab Coal-water dispersion and method of the manufacture thereof

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1601251A (en) * 1977-05-31 1981-10-28 Scaniainventor Ab Method of purifiying a carbonaceous material
US4242098A (en) * 1978-07-03 1980-12-30 Union Carbide Corporation Transport of aqueous coal slurries
US4282006A (en) * 1978-11-02 1981-08-04 Alfred University Research Foundation Inc. Coal-water slurry and method for its preparation
US4326855A (en) * 1979-11-08 1982-04-27 Cottell Eric Charles Process for beneficiating and stabilizing coal/oil/water fuels
GB2087862B (en) * 1980-11-18 1984-08-01 Dearborn Chemicals Ltd Process for dispersing particulate material in aqueous systems
US4358293A (en) * 1981-01-29 1982-11-09 Gulf & Western Manufacturing Co. Coal-aqueous mixtures
JPS5840392A (ja) * 1981-09-04 1983-03-09 Sumitomo Chem Co Ltd 石炭組成物

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983000500A1 (en) * 1981-08-03 1983-02-17 Stigsson, Lars, Lennart Coal-water dispersion
WO1983003618A1 (en) * 1982-04-05 1983-10-27 Fluidcarbon International Ab Coal-water dispersion and method of the manufacture thereof

Also Published As

Publication number Publication date
DK558483A (da) 1983-12-05
JPS59500520A (ja) 1984-03-29
DK558483D0 (da) 1983-12-05
EP0118440A1 (de) 1984-09-19
AU1223183A (en) 1983-11-04
CA1216425A (en) 1987-01-13
EP0105878A1 (de) 1984-04-25
NO834432L (no) 1983-12-02
FI834462A0 (fi) 1983-12-05
WO1983003617A1 (en) 1983-10-27
IT1207967B (it) 1989-06-01
FI834462A (fi) 1983-12-05
ES8402341A1 (es) 1984-01-16
ES519418A0 (es) 1984-01-16
WO1983003618A1 (en) 1983-10-27
IT8224584A0 (it) 1982-12-03
BR8306789A (pt) 1984-03-07

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