EP3402768A1 - Engrais résistant à l'agglutination et à la poussière - Google Patents

Engrais résistant à l'agglutination et à la poussière

Info

Publication number
EP3402768A1
EP3402768A1 EP17738934.3A EP17738934A EP3402768A1 EP 3402768 A1 EP3402768 A1 EP 3402768A1 EP 17738934 A EP17738934 A EP 17738934A EP 3402768 A1 EP3402768 A1 EP 3402768A1
Authority
EP
European Patent Office
Prior art keywords
bitumen
fertilizer
cutback
coating
dust
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.)
Pending
Application number
EP17738934.3A
Other languages
German (de)
English (en)
Other versions
EP3402768A4 (fr
Inventor
Mark B. Ogzewalla
Archimedo Mario CARLINI JR.
James J. Barnat
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.)
ArrMaz Products LP
Original Assignee
ArrMaz Products LP
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 ArrMaz Products LP filed Critical ArrMaz Products LP
Priority claimed from PCT/US2017/013196 external-priority patent/WO2017123762A1/fr
Publication of EP3402768A1 publication Critical patent/EP3402768A1/fr
Publication of EP3402768A4 publication Critical patent/EP3402768A4/fr
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D3/00—Calcareous fertilisers
    • C05D3/02—Calcareous fertilisers from limestone, calcium carbonate, calcium hydrate, slaked lime, calcium oxide, waste calcium products
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
    • C05G3/20—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for preventing the fertilisers being reduced to powder; Anti-dusting additives
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
    • C05G3/30—Anti-agglomerating additives; Anti-solidifying additives
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G5/00—Fertilisers characterised by their form
    • C05G5/30—Layered or coated, e.g. dust-preventing coatings
    • C05G5/37—Layered or coated, e.g. dust-preventing coatings layered or coated with a polymer

Definitions

  • This invention relates generally to coating compositions and more particularly, but not by way of limitation, to bituminous emulsions for dust control and anticaking of fertilizer during storage and transportation.
  • Fertilizers are generally in powder, crystalline, or granular form and have a tendency to generate dust during manufacture, storage, and transportation. Dust may be formed due to abrasion encountered during movement of the fertilizer particles, continued chemical reactions, or curing processes after the initial particle formation, which raises health concerns for human and animal inhalation when the dust becomes airborne. Fertilizer particles also have a tendency to cake or agglomerate into larger lumps due to changes in humidity and/or temperature or other environmental conditions. Cake formation causes a problem prior to the application of the fertilizer because the fertilizer must be broken up to provide a material that is suitable for even distribution in the field and to prevent clogging of distribution machinery.
  • the coating is further desirable for the coating to be fluid at application temperature such that it can be applied by conventional coating or conditioning equipment.
  • the coating formulation does not affect the handling characteristics, flowability, or agronomic properties of the fertilizer.
  • the invention in general, in a first aspect, relates to fertilizer composite comprising fertilizer and a coating at least partially covering the fertilizer.
  • the coating may comprise bitumen, cutback bitumen, or a combination of bitumen and cutback bitumen, where the bitumen, cutback bitumen, or combination of bitumen and cutback bitumen are combined and emulsified with water to produce the coating.
  • the fertilizer may be MAP, DAP, TSP, NPK, or a combination thereof and may be granular, crushed, compacted, crystalline, or prilled fertilizer or a combination thereof.
  • the bitumen, cutback bitumen, or combination of bitumen and cutback bitumen may comprise 20-100% bitumen.
  • the fertilizer composite may further comprise an effective amount of one or more additives where the one or more additives are added to the bitumen and or cutback bitumen prior to emulsification, to the water prior to emulsification, or bom.
  • the additives may include but are not limited to nutrient supplements and/or other agronomically beneficial additives, such as nitrogen stabilizers.
  • the coating composition may be sprayable at ambient temperature and/or may have a viscosity between about 10 cP at 72° F and about 100 cP at 120° F.
  • the invention in a second aspect, relates to a method of preventing dust formation and caking in fertilizer.
  • the method may comprise: combining bitumen and or a cutback bitumen; emulsifying the bitumen, cutback bitumen, or a combination of bitumen and cutback bitumen to produce a coating composition; and spraying the coating composition on the fertilizer.
  • the coating composition may be at ambient temperature when sprayed on the fertilizer.
  • the bitumen, cutback bitumen, or a combination of bitumen and cutback bitumen prior to emulsification may comprise 20-100% bitumen.
  • the method may further comprise combining an effective amount of one or more additives to the bitumen, cutback bitumen, or combination of bitumen and cutback bitumen prior to emulsification.
  • Figure 1 is a graph of viscosity versus temperature of various coating formulations
  • Figure 2 is a graph of cumulative dust levels over time for various coating formulations on MAP
  • Figure 3 is a graph of cumulative dust levels versus coating rate for the emulsified coating on MAP
  • Figure 4 is a graph of cumulative dust levels over time for various coating formulations on limestone
  • Figure 5 is a graph of caking strength for various coating formulations on DAP
  • Figure 6 is a graph of caking strength for various coating formulations on MAP.
  • Figure 7 is a graph of caking strength versus coating rate for the emulsified coating on MAP.
  • the invention in general, in a first aspect, relates to a bituminous emulsion for use as a coating for fertilizer or other particle, such as silica dust, respirable dust, etc.
  • the coating may control ambient dust levels, reduce dust formation, and reduce caking tendencies without affecting the handling characteristics of the fertilizer.
  • the coating may be sprayable without heating, making it easier to use than traditional coatings.
  • the bitumen in the bituminous emulsion may be any type of bitumen, including natural bitumen and bitumen from crude oii.
  • the bituminous emulsion may be formed by using bitumen directly or by using a modified bitumen.
  • the modified bitumen may be cutback bitumen, oil extended asphalt, or Wax extended asphalt.
  • the bituminous emulsion may be formed by using resins, specifically waxes.
  • the combination may be emulsified with water to form the final product.
  • the bitumen, cutback bitumen, or combination of bitumen and cutback bitumen prior to emulsification may comprise 20 to 100% bitumen, or more preferably 50 to 90% bitumen.
  • the combination may comprise 50 to 100% bitumen, and 0 to 50% cutback diluent.
  • the combination may men be mixed with water and an cmulsifier to produce the coating composition.
  • the solid content of the composition may be from about 20% to about 70% by weight of the total weight of the coating composition.
  • the coating composition may specifically exclude polyvinyl acetate butyl acrylate.
  • the coating composition may be used to coat inorganic or organic fertilizers.
  • the fertilizer may be a plant nutrient selected from the group consisting of compounds of primary macronutrients (Nitrogen, Phosphorous, and Potassium), secondary macronutrients (Calcium, Sulfur, and Magnesium), and micronutrients (Boron, Chlorine, Copper, Iron, Magnesium, Molybdenum, and Zinc), or combinations thereof, or may be any other desired fertilizer.
  • the fertilizer may be in granular, pelletized, crushed, compacted, crystalline, agglomerated, or prilled form.
  • the coating composition may not interfere with the fertilizer grade, the product quality, Or rate of release of the fertilizer.
  • the coating composition may be applied to the fertilizer through spraying, as noted above the coating composition may be sprayable at ambient temperature without heating. Ambient temperature may be considered to be 33° to 120° F, or more particularly 72° to 120° F.
  • the coating composition may be fluid and flexible enough to spread over the surface of the fertilizer granules during the coating process, yet may still have enough binding properties to adhere ambient dust to the surface of the granules and reduce dust formation during subsequent storage and handling.
  • the coating composition may have a viscosity from about 10 cP to about 100 cP at 72° F to 120° F. Specifically, the coating composition may have a lower viscosity than the current commercially available products at the same temperature. This may allow the user to skip the typical heating step normally required prior to the coating process. More broadly speaking, the viscosity may be less than 200 cP, preferably less than 100 cP at 120° F, and more preferably less than 10 eP at 72° F.
  • Fertilizers coated with this emulsified coating may generate less dust mat those coated with current commercial products.
  • fertilizers coated with this coating may cake less than those coated with current commercial products.
  • a reduction in caking tendency was unexpected because many fertilizers consists of or contain water soluble salts and the quality of the fertilizer is often compromised by the addition of water or contact with water. When water is absorbed by the fertilizer, the surface tends to become unstable and this promotes the growth of surface crystals, which lead to crystal bridging between granules, and this bridging leads to caking. Given that the emulsions coating contains between 80 % and 30 % water the reduction in caking tendency was unforeseen.
  • emulsifier used was an anionic surfactant mat is both oil soluble and water dispersible and the decision was made to use a soap portion of the emulsion at a pH of 6 to 8. It is expected that other anionic, cationic, or nonionic surfactants, amphoteric or zwitterionic emulsifiers, or pickering emulsions can be used to create similar emulsions.
  • the viscosity of the emulsified formulation was determined with a Brookfield DV-I+ viscometer with a Brookfield Therm osel temperature controller.
  • the viscosity of the emulsified formulation compared to two non-emulsified standard commercial products of de- dusting formulations can be seen in Figure 1.
  • the maximum viscosity of an easy to spray formulation is about 200 cP.
  • the viscosity of the de-dusting products both increased when temperature decreased, which indicates that the temperature needs to maintain at least 100° F for the first and at least 200° F for the second in order to efficiently coat the fertilizers.
  • the emulsified coating product may have a viscosity less than 100 cP even at the temperature below 100° F, which means there is no need to increase the temperature for the emulsified formulation when coating fertilizers since the viscosity is maintained in a Workable range. This eliminates the heating step often required before the coating is applied.
  • Dust levels were determined by using a dust tower described from United States
  • Patent No. 6,062,094 to Carlini et al. the fertilizer particles are passed through a counter current air stream and are agitated at the same time by passing through a series of grates.
  • the dust particles are collected on a filter and the dust levels determined by measuring the changes in weight on an analytical balance. Dust level were determined both initially after treatment with the coating formulations and again after aging for up to four weeks. This aging process is used to simulate the increase in dust levels normally encountered during the storage of fertilizers.
  • Caking levels were determined by using a compaction instrument to evaluate the strength required for breaking the caked fertilizer.
  • the fertilizer particles were placed into the conditioning chamber where controlled temperature, humidity, and pressure conditions are used to induce caking.
  • the caked fertilizer particles were placed under a probe attached to a digital force gauge. The probe is lowered at a controlled rate into the fertilizer granules to a depth of 1 ⁇ 2 inch.
  • the force required to break up the caked fertilizer was recorded from the force gauge and is a measurement of the extent of caking.
  • This example demonstrates the improvement in cumulative dust reduction of monoammonium phosphate (MAP) coated by the emulsified formulation as shown in Table 1.
  • the coating rate is fixed to 1.5 lbs/ton. Both initial dust levels and aged dust levels were determined after the fertilizers were treated with coating formulations, and the cumulative dust level was calculated by adding the dust level from each test period.
  • MAP monoammonium phosphate
  • MAP was initially coated with the first de-dusting product as the basecoat.
  • MAP typically coated with a basecoat for initial storage purposes.
  • the first de-dusting product or the emulsified formulation was then applied as top coat.
  • a top coating is typically applied to MAP prior to shipment.
  • the concentration of dust was determined at multiple time frames, up to six weeks and the cumulative dust levels recorded.
  • MAP with basecoat only generated the highest cumulative dust level. Applying a top coating reduced dust levels further and a top coating of the emulsified formulation significantly reduced the dust level comparing to a top coating of the first de-dusting product, as can be seen in Figure 2.
  • This example demonstrated the improvement of cumulative dust reduction of MAP by using various coating rates ranging from 1.S lbs/ton to 3.0 lbs/ton of the emulsified formulation as shown in Table 2. Both initial dust levels and aged dust levels were determined after the fertilizer was treated with three application rates, and the cumulative dust level was calculated by adding the dust level from each test period.
  • Example 3 the MAP was initially coated with the second de-dusting product as a basecoat for storage purpose.
  • the emulsified formulation was applied as the top coat with three different rates of coating. As shown in Table 2, cumulative dust levels were reduced significantly when higher coat rate was applied. A coating rate at 3 lbs/ton showed the best result in dust reduction as shown in Figure 3.
  • Table 4 and Table 5 demonstrated the effectiveness of caking level reduction when using the emulsified formulation compared to the other commercial formulations for diammonium phosphate (DAP) and mono ammonium (MAP), respectively.
  • the coating rate is fixed to 6 lbs/ton.
  • Caking strength was determined after the fertilizers were treated with coating formulations and conditioned in a conditioning chamber.
  • both the DAP and MAP were coated with the second de- dusting product 75 as the basecoat for storage purpose.
  • the application rate was 6 lbs/ton.
  • the base coating rate was reduced to 3 lbs/ton.
  • the first de-dusting product and emulsified formulation was then applied as the top coat at 3 lbs/ton.
  • To initiate caking the fertilizer samples were exposed to cycles of high and low temperature and humidity. Samples with coating were placed into chamber under 140° F and 75% RH and held for four hours. The samples were then cooled down to 72* F under 55% RH and held for two hours.
  • the temperature and humidity were again raised to 140° F and 75% RH and held for four hours. Finally, the samples in chamber were cooled down to 72° F under 55% RH and held for at least 16 hours to complete a condition cycle. The DAP and MAP samples should be caked after these cycles.
  • Table 6 demonstrated the effectiveness of caking reduction for the emulsified formulation in MAP with two different coating rates and two different conditioning cycles. Caking levels were determined after the MAP was treated with the emulsified formulation and conditioned into the conditioning chamber.
  • the MAP was coated with the second de-dusting product as the basecoat at 6 lbs/ton for storage purpose.
  • the emulsified formulation was then applied as the top coat at 3 lbs/ton and 8 lbs/ton coating rates.
  • the MAP samples were exposed to cycles of high and low temperature and humidity. Samples were placed into a conditioning chamber under 140° F with humidity of either 70% or 75% RH and held for 3.5 hours. The samples were cooled down to 72 e F under 55% RH and held for two hours. The temperature and humidity were again raised again to 140° F with humidity of either 70% or 75% RH and held for 3.5 hours.
  • Tables 7 and 8 again demonstrated the effectiveness of caking and cumulative dust reduction for the emulsified formulation on MAP (Mono Ammonium Phosphate) with 3 different coating rates compared to other de-dusting agents with and without anti-cake additive. Caking levels were determined after the MAP was treated with the emulsified formulation and conditioned in the conditioning chamber.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Fertilizers (AREA)

Abstract

L'invention concerne un procédé de réduction de la formation de poussière et de l'agglutination dans un engrais consistant à enrober l'engrais dans une émulsion bitumineuse. L'enrobage peut comprendre du bitume, du bitume fluidifié ou une combinaison de bitume et de bitume fluidifié comprenant 20 à 100 % de bitume. Le bitume, le bitume fluidifié ou leur combinaison peuvent être émulsifiés avec de l'eau avant d'être pulvérisés sur l'engrais.
EP17738934.3A 2016-01-15 2017-01-12 Engrais résistant à l'agglutination et à la poussière Pending EP3402768A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201662279289P 2016-01-15 2016-01-15
PCT/US2017/013196 WO2017123762A1 (fr) 2016-01-15 2017-01-12 Engrais résistant à l'agglutination et à la poussière

Publications (2)

Publication Number Publication Date
EP3402768A1 true EP3402768A1 (fr) 2018-11-21
EP3402768A4 EP3402768A4 (fr) 2019-08-14

Family

ID=62104033

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17738934.3A Pending EP3402768A4 (fr) 2016-01-15 2017-01-12 Engrais résistant à l'agglutination et à la poussière

Country Status (3)

Country Link
EP (1) EP3402768A4 (fr)
CN (1) CN108698950A (fr)
AR (1) AR107368A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2525658A1 (de) * 1975-06-09 1976-12-30 Richard Dipl Ing Reeker Torfumhuellter mineralduenger mit differenzierter naehrstoff- und humuswirkung
US5968222A (en) * 1997-02-07 1999-10-19 Cargill, Incorporated Dust reduction agents for granular inorganic substances
CN1111344C (zh) * 2000-10-27 2003-06-18 四川省励自生态与环境工程技术有限公司 岩石边坡植被护坡种植基
US6514331B2 (en) * 2001-02-15 2003-02-04 Arr-Maz Products, Lp A Division Of Process Chemical, Llc Coating compositions containing methyl/ethyl esters and methods of using same
US6514332B2 (en) * 2001-02-15 2003-02-04 Arr-Maz Products, Lp, A Division Of Process Chemicals, Llc Coating compositions containing methyl/ethyl esters and methods of using same
CN101265141B (zh) * 2008-04-23 2011-01-19 侯金荣 一种肥料增效剂及其制备方法和应用
WO2010017108A2 (fr) * 2008-08-02 2010-02-11 Georgia-Pacific Chemicals Llc Emulsions de poix

Also Published As

Publication number Publication date
AR107368A1 (es) 2018-04-25
CN108698950A (zh) 2018-10-23
EP3402768A4 (fr) 2019-08-14

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