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公开(公告)号：US09908787B2
公开(公告)日：2018-03-06
申请号：US15311528
申请日：2015-06-23
Applicant: YARA INTERNATIONAL ASA
Inventor： Torstein Obrestad
CPC classification number: C01F11/44 , C01P2004/61 , C01P2006/82 , F26B3/06 , F26B11/028 , F26B11/0445
Abstract: The invention relates to a method for producing an anhydrous powder having a calcium nitrate content of between 92 and 99.9 weight %, a water content of between 0.1 and 8 weight %; and a particle size of between 0.05 and 1.5 mm, wherein the method comprises the step of subjecting a calcium nitrate solution having a water content of between 70 and 15 weight % and a calcium nitrate content of between 30 and 85 weight % to a drying step in an industrial turbo-dryer, resulting in the anhydrous calcium nitrate powder. The invention furthermore relates to such an anhydrous calcium nitrate powder and the use of an industrial turbo-dryer to produce such anhydrous calcium nitrate powder.
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Patent Agency Ranking
公开(公告)号：US20170096347A1
公开(公告)日：2017-04-06
申请号：US15311528
申请日：2015-06-23
Applicant: YARA INTERNATIONAL ASA
Inventor： Torstein Obrestad
CPC classification number: C01F11/44 , C01P2004/61 , C01P2006/82 , F26B3/06 , F26B11/028 , F26B11/0445
Abstract: The invention relates to a method for producing an anhydrous powder having a calcium nitrate content of between 92 and 99.9 weight %, a water content of between 0.1 and 8 weight %; and a particle size of between 0.05 and 1.5 mm, wherein the method comprises the step of subjecting a calcium nitrate solution having a water content of between 70 and 15 weight % and a calcium nitrate content of between 30 and 85 weight % to a drying step in an industrial turbo-dryer, resulting in the anhydrous calcium nitrate powder. The invention furthermore relates to such an anhydrous calcium nitrate powder and the use of an industrial turbo-dryer to produce such anhydrous calcium nitrate powder.
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公开(公告)号：US09932509B2
公开(公告)日：2018-04-03
申请号：US14427518
申请日：2013-09-17
Applicant: YARA INTERNATIONAL ASA
Inventor： Torstein Obrestad , Amund Myrstad , Tore Frogner
IPC: C09K5/12
CPC classification number: C09K5/12
Abstract: The present invention relates to the use of a double salt of Ca(NO3)2 and KNO3 for the manufacture of a melt, in particular a nitrate-based heat transfer fluid (HTF) and/or thermal energy storage fluid, for example in solar energy applications, such as in solar electrical power plant systems using a parabolic through, a central receiver or a linear Fresnel, which have both a low melting temperature and a high decomposition temperature, as well as to methods for the manufacture thereof. Using said double salt, a melt could be manufactured comprising at least NaNO3, KNO3 and Ca(NO3)2, preferably, an eutectic ternary melt comprising Ca(NO3)2, NaNO3 and KNO3 in a weight ratio of about 42:15:43 with an operating temperature of about 131° C. to about 560° C.
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公开(公告)号：US12103896B2
公开(公告)日：2024-10-01
申请号：US17850137
申请日：2022-06-27
Applicant: YARA INTERNATIONAL ASA
Inventor： Amund Myrstad , Petr Chladek , Torstein Obrestad
Abstract: The present disclosure concerns fertilizer particles comprising calcium nitrate and potassium nitrate. It is found that fertilizer particles comprising 43 to 47% w/w calcium nitrate and 46 to 54% w/w potassium nitrate can be produced by melt granulation. Due to undercooling problems, such particles were not expected to be suitable for industrial production by melt granulation. However, the present disclosure provides a composition which forms a low viscosity melt with short solidification time. This was successfully achieved by reducing the water content of a fertilizer melt comprising 43 to 47% w/w calcium nitrate and 46 to 54% w/w potassium nitrate to less than 3% w/w of the melt.
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公开(公告)号：US11485689B2
公开(公告)日：2022-11-01
申请号：US16476942
申请日：2018-01-15
Applicant: YARA INTERNATIONAL ASA
Inventor： Amund Myrstad , Petr Chladek , Torstein Obrestad
Abstract: The present disclosure concerns fertilizer particles comprising calcium nitrate and potassium nitrate. It is found that fertilizer particles comprising 43 to 47% w/w calcium nitrate and 46 to 54% w/w potassium nitrate can be produced by melt granulation. Due to undercooling problems, such particles were not expected to be suitable for industrial production by melt granulation. However, the present disclosure provides a composition which forms a low viscosity melt with short solidification time. This was successfully achieved by reducing the water content of a fertilizer melt comprising 43 to 47% w/w calcium nitrate and 46 to 54% w/w potassium nitrate to less than 3% w/w of the melt.
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6.发明授权公开(公告)号：US10294170B2
公开(公告)日：2019-05-21
申请号：US15518557
申请日：2015-11-25
Applicant: YARA INTERNATIONAL ASA
Inventor： Torstein Obrestad , Terje Tande
IPC: C09D191/06 , C05G3/00 , B01J2/30 , C05C1/00 , C05C11/00 , C05C9/00 , C05C3/00 , C05C5/00 , C05C5/04
Abstract: The invention relates to a conditioning agent for reducing water absorption and dust formation of a particulate fertilizer, comprising 10 to 50 weight % of wax, 40 to 90 weight % of mineral oil and 1 to 15 weight % of a resin being mineral oil-soluble and miscible with wax and mineral oil, wherein the agent further comprises 0.1 to 1 weight % of a viscoelastic elastomer selected from the group of polyisobutylene and styrene-isoprene-styrene block copolymer which is soluble in mineral oil and has an average molecular weight of 30.000 to 5.000.000. The invention further relates to a particulate fertilizer composition, preferably a urea-ammonium sulfate (UAS) fertilizer, a urea fertilizer or a calcium nitrate fertilizer, comprising a particulate substrate, preferably an hygroscopic fertilizer, preferably a nitrogen-containing fertilizer, and 0.05 to 2 weight % of said coating thereon for reducing moisture uptake and dust formation of said fertilizer.
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