EP0084535B1 - Dispersion charbon-eau - Google Patents

Dispersion charbon-eau Download PDF

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Publication number
EP0084535B1
EP0084535B1 EP82901174A EP82901174A EP0084535B1 EP 0084535 B1 EP0084535 B1 EP 0084535B1 EP 82901174 A EP82901174 A EP 82901174A EP 82901174 A EP82901174 A EP 82901174A EP 0084535 B1 EP0084535 B1 EP 0084535B1
Authority
EP
European Patent Office
Prior art keywords
dispersion
coal
weight
polymers
water
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
EP82901174A
Other languages
German (de)
English (en)
Other versions
EP0084535A1 (fr
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
Application filed by Fluidcarbon International AB filed Critical Fluidcarbon International AB
Priority to AT82901174T priority Critical patent/ATE25398T1/de
Publication of EP0084535A1 publication Critical patent/EP0084535A1/fr
Application granted granted Critical
Publication of EP0084535B1 publication Critical patent/EP0084535B1/fr
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 a coal-water dispersion which is very stable in storage and is suitable for transport and energy production. More particularly the invention relates to a dispersion comprising water, pulverized coal and additives, the coal content ranging from 60 to 80% 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 transforming 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 some organic fuel such as heating oil, methanol, etc, or of water.
  • the problem of water dispersions of pulverized coal mainly is to make the dispersion stable at low viscosity.
  • the coal particles must not sediment during storage or transport of the coal dispersion.
  • the coal 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.
  • the dispersion 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 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 provided also by directly measuring the forces between surfaces mutually spaced a few tenths of nm. A theoretical 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 this invention in order to impart desired properties to a suspension of a low dielectric substance. 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.
  • At least one anionic or non-ionic polymer co-operating with the surface-active substance and containing segments of hydrophobic as well as hydrophilic character is 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, such as xanthan gum or guar gum, polyalcohols and polyacrylates.
  • Particularly suitable according to the invention are polyethyleneoxide, copolymers of polypropyleneoxide and polyethyleneoxide, with a dominating amount of polyethyleneoxide.
  • the molecular weight of the copolymer ranges from 5,000 to 50,000 and most preferred is that the copolymer contains at least 70% by weight of polyethyleneoxide, the molecular weight ranging from 8,000 to 15,000.
  • the 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 total amount of additives preferably is below 2% by weight.
  • 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 percipitator.
  • 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 a water solution. 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)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
  • Liquid Carbonaceous Fuels (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Lubricants (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Claims (7)

1. Dispersion contenant de l'eau, du charbon pulvérisé et des additifs, la teneur en charbon étant comprise entre 60 et 80 % en poids, caractérisée en ce que la dispersion contient de la lécithine ou autre substance tension-active zwitterionique qui est adsorbée dans les surfaces des particules de charbon et aussi des polymères coopérant avec ladite substance, au moins l'un des polymères contenant des segments de caractère hydrophobe ainsi qu'hydrophile.
2. Dispersion selon la revendication 1, caractérisée en ce que l'un des polymères est un copolymère d'oxide de polypropylène et d'oxyde de polyéthylène avec une quantité dominante d'oxyde de polyéthylène.
3. Dispersion selon la revendication 2, caractérisée en ce que le poids moléculaire du copolymère est comprise entre 5 000 et 50 000.
4. Dispersion selon la revendication 3, caractérisée en ce que le copolymère contient au moins 70 % en poids d'oxyde de polyéthylène et en ce que le poids moléculaire est compris entre 8 000 et 15000.
5. Dispersion selon la revendication 1, caractérisée en ce que l'un des polymères est un polysaccharide.
6. Dispersion selon la revendication 5, caractérisée en ce que la polysaccharide est le gomme xanthane ou la gomme guar.
7. Dispersion selon la revendication 1, caractérisé en ce que la quantité totale d'additif est inférieure à 2 % en poids.
EP82901174A 1981-08-03 1982-04-05 Dispersion charbon-eau Expired EP0084535B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82901174T ATE25398T1 (de) 1981-08-03 1982-04-05 Kohle-wasser dispersion.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8104645A SE436136B (sv) 1981-08-03 1981-08-03 Kol-vattendispersion med additiv bestaende av zwitterjonisk tensid och dermed samverkande hydrofila polymerer
SE8104645 1981-08-03

Publications (2)

Publication Number Publication Date
EP0084535A1 EP0084535A1 (fr) 1983-08-03
EP0084535B1 true EP0084535B1 (fr) 1987-02-04

Family

ID=20344323

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82901174A Expired EP0084535B1 (fr) 1981-08-03 1982-04-05 Dispersion charbon-eau

Country Status (11)

Country Link
EP (1) EP0084535B1 (fr)
AT (1) ATE25398T1 (fr)
AU (1) AU557810B2 (fr)
BR (1) BR8207824A (fr)
DE (1) DE3275385D1 (fr)
DK (1) DK152374C (fr)
FI (1) FI75861C (fr)
NO (1) NO160587C (fr)
SE (1) SE436136B (fr)
SU (1) SU1303032A3 (fr)
WO (1) WO1983000500A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983003617A1 (fr) * 1982-04-05 1983-10-27 Stigsson, Lars, Lennart Dispersion charbon-eau et son procede d'obtention
SE8202879L (sv) * 1982-05-07 1983-11-08 Carbogel Ab Vattenuppslamning av ett fast brensle samt sett och medel for framstellning derav
SE8202878L (sv) * 1982-05-07 1983-11-08 Carbogel Ab Pumpbar vattenuppslamning av ett fast brensle samt sett att framstella en sadan
US4472170A (en) * 1982-12-27 1984-09-18 The Procter & Gamble Company Coal-water slurry compositions
SE450690B (sv) * 1983-03-18 1987-07-20 Bergvik Kemi Ab Dispergeringsmedel for fasta partiklar i vatten och anvendning av dispergeringsmedlet for dispergering av kolpartiklar
US4713086A (en) * 1984-03-02 1987-12-15 Amax Inc. Oil-compatible coal/water mixtures
US4592760A (en) * 1985-01-22 1986-06-03 Merck & Co., Inc. Coal slurry

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE417327B (sv) * 1977-05-31 1981-03-09 Scaniainventor Ab Brennbart medium bestaende av pulveriserat kol, vatten och som dispergeringsmedel polyakrylat eller polyfosfat samt forfarande for framstellning herav
JPS5643394A (en) * 1979-09-14 1981-04-22 Lion Corp Dispersant for mixed fuel
JPS5657888A (en) * 1979-10-17 1981-05-20 Lion Corp Dispersing agent for mixed fuel
JPS5657887A (en) * 1979-10-17 1981-05-20 Lion Corp Dispersing agent for mixed fuel

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, vol. 5, no. 120, C65, abstract of JP 56-57887, publ. 1981-05-20 *
Patent Abstracts of Japan, vol. 5, no. 120, C65, abstract of JP 56-57888, publ. 1981-05-20 *

Also Published As

Publication number Publication date
FI831100A0 (fi) 1983-03-30
ATE25398T1 (de) 1987-02-15
FI75861B (fi) 1988-04-29
AU8333582A (en) 1983-02-22
SU1303032A3 (ru) 1987-04-07
DK152374B (da) 1988-02-22
SE436136B (sv) 1984-11-12
DK146683D0 (da) 1983-03-30
NO831118L (no) 1983-03-28
WO1983000500A1 (fr) 1983-02-17
FI75861C (fi) 1988-08-08
NO160587C (no) 1989-05-03
AU557810B2 (en) 1987-01-08
NO160587B (no) 1989-01-23
FI831100L (fi) 1983-03-30
SE8104645L (sv) 1983-02-04
BR8207824A (pt) 1983-09-06
EP0084535A1 (fr) 1983-08-03
DE3275385D1 (en) 1987-03-12
DK152374C (da) 1988-08-01
DK146683A (da) 1983-03-30

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