US20210292674A1 - Antioxidant for coal and method for preventing oxidation of coal - Google Patents

Antioxidant for coal and method for preventing oxidation of coal Download PDF

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US20210292674A1
US20210292674A1 US17/266,109 US201917266109A US2021292674A1 US 20210292674 A1 US20210292674 A1 US 20210292674A1 US 201917266109 A US201917266109 A US 201917266109A US 2021292674 A1 US2021292674 A1 US 2021292674A1
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coal
antioxidant
surfactant
deposit
resin emulsion
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Masaki Miyahara
Youichi HIRANO
Takashi Kikkawa
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Kurita Water Industries Ltd
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Kurita Water Industries Ltd
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Assigned to KURITA WATER INDUSTRIES LTD. reassignment KURITA WATER INDUSTRIES LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HIRANO, YOUICHI, KIKKAWA, TAKASHI, MIYAHARA, MASAKI
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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
    • C10L9/00—Treating solid fuels to improve their combustion
    • C10L9/10—Treating solid fuels to improve their combustion by using additives
    • 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
    • C10L10/00—Use of additives to fuels or fires for particular purposes
    • C10L10/18—Use of additives to fuels or fires for particular purposes use of detergents or dispersants for purposes not provided for in groups C10L10/02 - C10L10/16
    • 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
    • C10L10/00—Use of additives to fuels or fires for particular purposes
    • 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
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/04—Raw material of mineral origin to be used; Pretreatment thereof
    • 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
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/26—After-treatment of the shaped fuels, e.g. briquettes
    • C10L5/32—Coating
    • 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
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/34—Other details of the shaped fuels, e.g. briquettes
    • C10L5/36—Shape
    • 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
    • C10L2230/00—Function and purpose of a components of a fuel or the composition as a whole
    • C10L2230/08—Inhibitors
    • C10L2230/081—Anti-oxidants
    • 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
    • C10L2230/00—Function and purpose of a components of a fuel or the composition as a whole
    • C10L2230/14—Function and purpose of a components of a fuel or the composition as a whole for improving storage or transport of the fuel
    • 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
    • C10L2250/00—Structural features of fuel components or fuel compositions, either in solid, liquid or gaseous state
    • C10L2250/04—Additive or component is a polymer
    • 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
    • C10L2250/00—Structural features of fuel components or fuel compositions, either in solid, liquid or gaseous state
    • C10L2250/06—Particle, bubble or droplet size
    • 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
    • C10L2250/00—Structural features of fuel components or fuel compositions, either in solid, liquid or gaseous state
    • C10L2250/08—Emulsion details
    • C10L2250/082—Oil in water (o/w) emulsion
    • 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
    • C10L2250/00—Structural features of fuel components or fuel compositions, either in solid, liquid or gaseous state
    • C10L2250/08—Emulsion details
    • C10L2250/086—Microemulsion or nanoemulsion
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/18—Spraying or sprinkling
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/20—Coating of a fuel as a whole or of a fuel component

Definitions

  • the present invention relates to an antioxidant for coal and a method for preventing oxidation of coal. More specifically, the present invention relates to chemical agents and prevention methods that contribute to the prevention of heat generation, heat storage and spontaneous combustion associated with the oxidation of coal deposited in coal yards (yards, silos, etc.) of coal mines, steel mills, power plants, etc.
  • coal In steel mills and power plants, coal is left in piles in a coal yard. When left for a long period of time, carbon and sulfur contained in coal react with oxygen in the air, and spontaneous oxidation proceeds. Then, the reaction heat generated during this spontaneous oxidation accumulates inside the coal deposit as thermal energy, and the temperature inside the coal deposit rises, leading to spontaneous combustion.
  • Patent Document 1 Conventionally, in order to prevent such spontaneous heat generation and spontaneous combustion, it has been proposed that when transferring and depositing coal, transferring and/or depositing are conducted while spraying SBR latex-containing liquid on the coal (see Patent Document 1). It has also been proposed to spray a resin solution containing white powder on the surface of a coal pile in the field to form a white coating film (see Patent Document 2). It has also been proposed to spray an acrylic emulsion or a vinyl acetate emulsion on coal (see Patent Document 3).
  • the present invention has been made in view of the above circumstances, and is intended to provide an antioxidant capable of coating the surface layer of coal deposits (coal piles) and further reducing the amount of oxygen permeation into the inside of the deposits.
  • the present inventors have found that the above problems can be solved by setting the average particle size of the resin emulsion sprayed on coal within a specific range, and have completed the present invention. Specifically, the present invention provides:
  • the present invention is an antioxidant for coal, containing an oil-in-water type resin emulsion having an average particle size of emulsion particles of 0.3 ⁇ m or more and 1.0 ⁇ m or less.
  • the present invention is also the antioxidant for coal according to (1), further containing a surfactant.
  • the present invention is also a method for preventing oxidation of coal, wherein an antioxidant for coal, containing an oil-in-water type resin emulsion having an average particle size of emulsion particles of 0.3 ⁇ m or more and 1.0 ⁇ m or less is sprayed on coal deposits.
  • the present invention is also the method for preventing oxidation of coal according to (3), wherein the antioxidant for coal is prepared by mixing the oil-in-water type resin emulsion and a surfactant.
  • the antioxidant for coal contains an oil-in-water type resin emulsion with a specific range of the average particle size of emulsion particles
  • a consolidated layer having a high oxygen permeation suppressing effect is formed on the surface of the coal deposit. Therefore, the permeation of oxygen in the air atmosphere into the inside of the coal deposit is blocked, and the oxidation of coal can be prevented. Therefore, the spontaneous heat generation and spontaneous combustion due to oxidation reaction can be effectively prevented as compared with the conventional case. Therefore, it is possible to avoid accidents caused by spontaneous heat generation and spontaneous combustion of coal, and to reduce the burden of various maintenance work related to them.
  • the antioxidant for coal preferably further contains a surfactant.
  • a surfactant By adding a surfactant to the highly hydrophobic coal deposit, the permeability can be improved, allowing the chemical solution to spread and produce a uniform coal consolidated layer. As a result, the permeability of oxygen into the coal deposit is further reduced, and the antioxidant effect is further enhanced.
  • FIG. 1 is a schematic diagram of the test apparatus used in the test using the antioxidant for coal of the present invention.
  • the antioxidant for coal of the present invention contains an oil-in-water type resin emulsion having an average particle size of emulsion particles of 0.3 ⁇ m or more and 0.6 ⁇ m or less.
  • the antioxidant for coal preferably further contains a surfactant.
  • the type of resin in the resin emulsion is not particularly limited, but preferably includes one or more selected from acrylic acid-based, methacrylic acid-based, and vinyl acetate-based resins. In particular, it is more preferable to include one or more selected from a butyl acrylate copolymer and a vinyl acetate/acrylic acid copolymer.
  • butyl acrylate/methyl methacrylate copolymer vinyl acetate/butyl acetate/2-ethylhexyl acrylate copolymer, butadiene/styrene/acrylic acid copolymer, vinyl acetate/butyl acetate/2-ethylhexyl acrylate copolymer and vinyl acetate/acrylic acid ester copolymer.
  • the lower limit of the average particle size of the emulsion particles in the resin emulsion is 0.3 ⁇ m or more.
  • the lower limit of the average particle size is preferably 0.4 ⁇ m or more, and more preferably 0.5 ⁇ m or more. If the average particle size is too small, even if the antioxidant for coal is sprayed on the surface of the coal deposit, the expected antioxidant effect may not be obtained, which is not preferable.
  • the upper limit of the average particle size of the emulsion particles in the resin emulsion is 1.0 ⁇ m or less.
  • the upper limit of the average particle size is preferably 0.9 ⁇ m or less, more preferably 0.8 ⁇ m or less, further preferably 0.7 ⁇ m or less, and particularly preferably 0.6 ⁇ m or less. If the average particle size is too large, even if the antioxidant for coal is sprayed on the surface of the coal deposit, the expected antioxidant effect may not be obtained, which is not preferable.
  • the average particle size of the emulsion particles in the resin emulsion means the average particle size measured using a laser analysis type particle size distribution measuring apparatus/Shimadzu SALD-7500 nano (manufactured by Shimadzu Corporation).
  • the production method of the resin emulsion is not particularly limited.
  • it can be easily prepared by emulsion polymerization of a monomer component. More specifically, it can be prepared by polymerizing the monomer component in micelles formed in water with an emulsifier with a polymerization initiator.
  • the antioxidant for coal preferably further contains a surfactant.
  • the type of the surfactant is not particularly limited, and may be any of an anionic, cationic, nonionic, and amphoteric surfactants.
  • the surfactant is preferably a nonionic type or a cationic type, and particularly preferably a nonionic type. It is thought, because, due to the hydrophobic surface of the coal deposit, the use of nonionic or cationic surfactants further enhances the familiarity between the surface of the coal deposit and the resin emulsion, resulting in the formation of a denser consolidated layer.
  • anionic surfactants examples include sulfonic acid-based surfactants, and more specifically, di-2-ethylhexyl sulfosuccinate sodium salt-based surfactants.
  • cationic surfactants include ammonium salt-based surfactants, and more specifically, trialkylbenzylammonium salt-based surfactants.
  • nonionic surfactants examples include ether-based surfactants, and more specifically, polyoxyalkylene alkyl ether-based surfactants.
  • amphoteric surfactants examples include betaine-based surfactants, and more specifically fatty acid amide propyl betaine-based surfactants.
  • the above resin emulsion is sprayed on the coal deposit (coal pile). It is more preferable to spray a mixture of the above resin emulsion and the above surfactant onto the coal deposit (coal pile).
  • the “coal deposit” or “coal pile” includes all of the deposited coal and does not necessarily have to be a mountain-shaped deposit.
  • all coal aggregates such as coal put into and deposited in a container are referred to as “coal deposit” or “coal pile”.
  • the oil-in-water type resin emulsion may be used alone as an antioxidant for coal, or a mixture of the oil-in-water type resin emulsion and the surfactant may be used as an antioxidant for coal.
  • a mixture in which the oil-in-water type resin emulsion and the surfactant are mixed in advance may be brought to the site, or the oil-in-water type resin emulsion and the surfactant may be brought individually to the site and the respective materials may be mixed at the site.
  • the concentrations of the resin emulsion and the surfactant are not particularly limited, but the lower limit of the solid content concentration of the resin emulsion as a concentration of the antioxidant for coal used when spraying on the coal deposit (coal pile) is preferably 0.005% by weight or more, more preferably 5% by weight or more, and further preferably 10% by weight or more with respect to the antioxidant for coal.
  • the upper limit of the solid content concentration of the resin emulsion is preferably 50% by weight or less, more preferably 40% by weight or less, and further preferably 20% by weight or less with respect to the antioxidant for coal.
  • the lower limit of the solid content concentration of the surfactant is preferably 0.005% by weight or more, more preferably 0.01% by weight or more, and further preferably 0.1% by weight or more with respect to the antioxidant for coal.
  • the upper limit of the solid content concentration of the surfactant is preferably 50% by weight or less, more preferably 10% by weight or less, and further preferably 1% by weight or less with respect to the antioxidant for coal.
  • the antioxidant for coal is sprayed on the coal deposit (coal pile).
  • a rain gun, a sprinkler truck, or a hose from a stacker or a reclaimer can be used.
  • the amount of the antioxidant for coal sprayed is not particularly limited, but in consideration of both the effect of preventing spontaneous heat generation and spontaneous combustion and the cost of chemical agents, as a guide, the amount of the active substance may be 0.5 to 2,000 g, preferably 10 to 1,500 g, and particularly preferably 100 to 1,000 g, per 1 m 2 of surface area of coal deposit (coal pile).
  • the test piece after being left for one week was housed in a device having the specifications shown in FIG. 1 so that the test piece served as a boundary wall separating the two spaces. Then, as shown in FIG. 1 , of the two spaces having the test piece as the boundary wall therebetween, standard air was continuously sent to one space, and pure nitrogen was continuously sent to the other space. At this time, the flow rates of the standard air and the pure nitrogen were both 30 mL/min, and the temperatures of the standard air and the pure nitrogen were both room temperature. The oxygen concentration in the space on the nitrogen side was then measured after 4 hours of continuous feeding of the standard air and the pure nitrogen. An oxygen analyzer 3600sn (manufactured by Hach Company) was used to measure the oxygen concentration. The case where the oxygen concentration was 7.0% or less was designated as “ ⁇ ”, and the case where the oxygen concentration exceeded 7.0% was designated as “x”. The results are shown in Table 1.
  • Example 1 0.3 15% — — 6.83 35.9 ⁇
  • Example 2 0.3 15% nonionic 0.2 5.39 49.4 ⁇
  • Example 3 0.3 15% cationic 0.2 5.76 45.9 ⁇
  • Example 4 0.3 15% anionic 0.2 6.08 42.9 ⁇
  • Example 5 0.3 15% amphoteric 0.2 5.52 48.2 ⁇
  • Example 6 0.6 15% — — 6.21 41.7 ⁇
  • Example 7 0.6 15% nonionic 0.2 0.20 98.1 ⁇
  • Example 8 0.6 15% cationic 0.2 0.99 90.7 ⁇
  • Example 9 0.6 15% anionic 0.2 6.95 34.7 ⁇
  • Example 10 0.6 15% amphoteric 0.2 5.65 46.9 ⁇ Comparative — — — — 10.65 — ⁇
  • Example 1 Comparative 0.2 15% — — 7.34 31.1 ⁇
  • Example 2 Comparative 0.2
  • the oil-in-water type resin emulsion is an emulsion of an acrylic acid copolymer.
  • the nonionic surfactant is a polyoxyalkylene alkyl ether-based surfactant.
  • the cationic surfactant is a trialkylbenzylammonium salt-based surfactant.
  • the anionic surfactant is a di-2-ethylhexyl sulfosuccinate sodium salt-based surfactant.
  • the amphoteric surfactant is a fatty acid amide propyl betaine-based surfactant.
  • the amount of oxygen permeated through the coal deposit (coal pile) can be reduced by 35% or more (Examples 1 to 10) compared with the case in which the antioxidant for coal contains no resin emulsion (Comparative Example 1 in which the liquid after dispersion contains only water, or Comparative Example 6 in which the antioxidant for coal contains only water and a nonionic surfactant).
  • the antioxidant for coal contains a surfactant in addition to the resin emulsion
  • the antioxidant effect is further enhanced (Examples 2 to 5, 7 to 10).
  • the surfactant is nonionic or cationic
  • the antioxidant effect is further enhanced (Examples 2, 3, 7, 8). It is thought because, due to the hydrophobic surface of the coal deposits, the use of nonionic or cationic surfactants further enhances the familiarity between the surface of the coal deposits and the resin emulsion, resulting in the formation of a denser consolidated layer.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
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  • Solid Fuels And Fuel-Associated Substances (AREA)
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JP2018152252A JP2020026489A (ja) 2018-08-13 2018-08-13 石炭用酸化防止剤及び石炭の酸化防止方法
JP2018-152252 2018-08-13
PCT/JP2019/015786 WO2020035973A1 (ja) 2018-08-13 2019-04-11 石炭用酸化防止剤及び石炭の酸化防止方法

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KR (1) KR20210020140A (ja)
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TW202020131A (zh) 2020-06-01
JP2020026489A (ja) 2020-02-20
WO2020035973A1 (ja) 2020-02-20
EP3800235A1 (en) 2021-04-07
KR20210020140A (ko) 2021-02-23

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