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 OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
  • 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.

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)
• Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
• Air Transport Of Granular Materials (AREA)
• Liquid Carbonaceous Fuels (AREA)

Applications Claiming Priority (2)

Publications (3)

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ID=6240907

Family Applications (1)

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• 1984
  • 1984-07-18 DE DE3426395A patent/DE3426395A1/de not_active Withdrawn
• 1985
  • 1985-07-10 EP EP85108549A patent/EP0171602B1/fr not_active Expired
  • 1985-07-10 DE DE8585108549T patent/DE3573928D1/de not_active Expired
  • 1985-07-16 CA CA000486841A patent/CA1260709A/fr not_active Expired
  • 1985-07-17 AU AU45113/85A patent/AU573364B2/en not_active Ceased
  • 1985-07-17 JP JP60156184A patent/JPS6143698A/ja active Pending
  • 1985-07-17 ZA ZA855380A patent/ZA855380B/xx unknown
  • 1985-07-18 US US06/756,317 patent/US4675025A/en not_active Expired - Fee Related

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