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公开(公告)号：US20190322540A1
公开(公告)日：2019-10-24
申请号：US16312906
申请日：2017-06-22
Applicant: PRAYON TECHNOLOGIES
Inventor： Thomas HENRY , Tibaut THEYS
IPC: C01F11/46 , C01B25/231 , C01B25/32 , C04B11/26
Abstract: A method for preparing calcium sulphate comprising a production of DCP by the attack of a source of phosphate by an acid, a digestion of the isolated DCP by the sulphuric acid under conditions giving rise to the formation of a first slurry of gypsum suspended in an acidic aqueous phase having a content of free SO3 equal to or less than 1.5% and a content of free P2O5, a conversion of at least part of said first slurry by heating to a temperature greater than 80° C. and potentially by adding sulphuric acid, with solubilisation of the gypsum crystals and recrystallisation of the solubilised calcium sulphate in a second slurry of α-calcium sulphate hemihydrate crystals suspended in an aqueous phase based-on phosphoric acid, wherein the content of free SO3 is less than 10% by weight, and a separation between said aqueous phase and a filter cake based on particularly pure α-calcium sulphate hemihydrate.
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公开(公告)号：US09828471B2
公开(公告)日：2017-11-28
申请号：US14483933
申请日：2014-09-11
Applicant: PRAYON TECHNOLOGIES
Inventor： Alain Germeau , Bernard Heptia
CPC classification number: C08G79/04 , B01J8/025 , B01J8/0278 , B01J10/00 , B01J19/24 , B01J19/26 , B01J2219/00157 , C01B25/24
Abstract: A method and device for producing polyphosphoric acid burns a fuel in combustion air in a combustion chamber, sprays a spray fluid comprising substantially pure orthophosphoric acid and undertakes polymerization-condensation of the pure orthophosphoric acid. A polyphosphoric acid in the form of an acid mist accompanied by formation of gases which mix with combustion gases resulting from burning of the fuel is formed to reach a predetermined temperature, wherein the mixture causes sudden lowering of combustion gas temperature. The acid mix is separated from the gas mixture and the polyphosphoric acid is collected at a bottom of the combustion chamber and the gas mixture is outputted via a lower part of the combustion chamber separate from the collection of polyphosphoric acid.
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公开(公告)号：US20200165133A1
公开(公告)日：2020-05-28
申请号：US16637254
申请日：2018-08-10
Applicant: PRAYON TECHNOLOGIES
Inventor： Alexandre Wavreille , Livio Lederer , Léon Ninane
IPC: C01B25/32
Abstract: Process of acid attack with sulphuric acid of a phosphate source comprising calcium or not comprising calcium for a predetermined time period ranging from 20 to 180 minutes in the conditions wherein the molar ratio of sulphate from the sulphuric acid and possibly from the phosphate source to the calcium present in the phosphate source ranges from 0.6 to 0.8, and the content in P2O5 in the attack tank is of less than 6%.
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Patent Agency Ranking
公开(公告)号：US10662072B2
公开(公告)日：2020-05-26
申请号：US16312906
申请日：2017-06-22
Applicant: PRAYON TECHNOLOGIES
Inventor： Thomas Henry , Tibaut Theys
IPC: C04B11/26 , C01F11/46 , C01B25/231 , C01B25/32
Abstract: A method for preparing calcium sulphate comprising a production of DCP by the attack of a source of phosphate by an acid, a digestion of the isolated DCP by the sulphuric acid under conditions giving rise to the formation of a first slurry of gypsum suspended in an acidic aqueous phase having a content of free SO3 equal to or less than 1.5% and a content of free P2O5, a conversion of at least part of said first slurry by heating to a temperature greater than 80° C. and potentially by adding sulphuric acid, with solubilisation of the gypsum crystals and recrystallisation of the solubilised calcium sulphate in a second slurry of α-calcium sulphate hemihydrate crystals suspended in an aqueous phase based-on phosphoric acid, wherein the content of free SO3 is less than 10% by weight, and a separation between said aqueous phase and a filter cake based on particularly pure α-calcium sulphate hemihydrate.
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公开(公告)号：US20190322530A1
公开(公告)日：2019-10-24
申请号：US16311626
申请日：2017-06-27
Applicant: PRAYON TECHNOLOGIES
Inventor： Tibaut THEYS , Thomas HENRY
IPC: C01B25/32
Abstract: This present invention disclosure relates to a method for the preparation of calcium monohydrogen phosphate comprising an etching in an aqueous medium, during a predetermined time period, of a phosphate source with an acid with formation of a pulp comprising an aqueous phase containing calcium phosphate in solution and a solid phase containing impurities, a first separation between said aqueous phase and said solid phase, during a predetermined time period, a neutralization of said aqueous phase at a sufficient pH to obtain a precipitation of said calcium monohydrogen phosphate, a second separation between said aqueous medium and said calcium monohydrogen phosphate, characterized in that said first separation of said step b) is carried out at a filtration rate of at least 0.1 ton of P2O5/√ΔP/m2/day.
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公开(公告)号：US20040089599A1
公开(公告)日：2004-05-13
申请号：US10697601
申请日：2003-10-29
Applicant: PRAYON TECHNOLOGIES
Inventor： Serge Kurowski
IPC: B01D033/00
CPC classification number: B01D33/19
Abstract: A continuous fluid filtration device having filtration cells disposed in a carousel around a rotation axis so as to be able to pivot about a tilt axis including apparatus for discharging the filtrate from the cells with at least one outlet orifice at the bottom of each cell, a central collector and a connection allowing flow of the filtrate between the outlet orifice and the collector, where the connection for each cell includes a flexible conduit in which, in the filtration position of the cell, no area of the flexible conduit is lower than another area of the conduit situated downstream with respect to the flow of the filtrate, the flexible conduit being arranged so as not to undergo any elongation during tilting of the cell.
Abstract translation: 一种连续流体过滤装置，其具有围绕旋转轴设置在转盘中的过滤单元，以便能够围绕倾斜轴线枢转，该倾斜轴线包括用于从每个单元底部的至少一个出口孔排出滤液的装置， 中央收集器和允许滤液在出口孔和收集器之间流动的连接，其中每个电池的连接包括柔性导管，其中在电池的过滤位置中，柔性导管的任何区域都不比另一区域低 位于下游的导管相对于滤液的流动，柔性导管布置成在电池倾斜期间不会发生任何伸长。
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公开(公告)号：US11407640B2
公开(公告)日：2022-08-09
申请号：US16637254
申请日：2018-08-10
Applicant: PRAYON TECHNOLOGIES , Raphael Etienne Lederer , Robert Edouard Lederer
Inventor： Alexandre Wavreille , Livio Lederer , Léon Ninane
IPC: C01B25/32
Abstract: Process of acid attack with sulphuric acid of a phosphate source comprising calcium or not comprising calcium for a predetermined time period ranging from 20 to 180 minutes in the conditions wherein the molar ratio of sulphate from the sulphuric acid and possibly from the phosphate source to the calcium present in the phosphate source ranges from 0.6 to 0.8, and the content in P2O5 in the attack tank is of less than 6%.
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公开(公告)号：US20190330063A1
公开(公告)日：2019-10-31
申请号：US16311595
申请日：2017-06-27
Applicant: PRAYON TECHNOLOGIES
Inventor： Tibaut Theys , Thomas Henry
Abstract: This disclosure relates to a method for the preparation of calcium monohydrogen phosphate comprising an etching in an aqueous medium, during a predetermined time period, a source of phosphate with an acid with formation of a pulp comprising an aqueous phase containing calcium phosphate in solution and a solid phase containing impurities, a first separation between said aqueous phase and said solid phase, during a predetermined time period, a neutralization of said aqueous phase at a sufficient pH to obtain a precipitation of said calcium monohydrogen phosphate, a second separation between said aqueous medium and said calcium monohydrogen phosphate, characterized in that said predetermined time period of said step a) of digestion is greater than that of said step b).
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