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1. WO2006016079 - IMPROVED METHOD FOR MAKING PHOSPHORIC ACID

Publication Number WO/2006/016079
Publication Date 16.02.2006
International Application No. PCT/FR2005/050451
International Filing Date 16.06.2005
IPC
C01B 25/225 2006.1
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
25Phosphorus; Compounds thereof
16Oxyacids of phosphorus; Salts thereof
18Phosphoric acid
22Preparation by reacting phosphate containing material with an acid, e.g. wet process
222with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
223only one form of calcium sulfate being formed
225Dihydrate process
CPC
C01B 25/225
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
25Phosphorus; Compounds thereof
16Oxyacids of phosphorus; Salts thereof
18Phosphoric acid
22Preparation by reacting phosphate-containing material with an acid, e.g. wet process
222with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
223only one form of calcium sulfate being formed
225Dihydrate process
Applicants
  • VICHEM [FR]/[FR] (AllExceptUS)
  • NINEUIL, Guy [FR]/[FR] (UsOnly)
  • SIRBA, Thierry [FR]/[FR] (UsOnly)
Inventors
  • NINEUIL, Guy
  • SIRBA, Thierry
Agents
  • DENJEAN, Eric
Priority Data
045152413.07.2004FR
Publication Language French (fr)
Filing Language French (FR)
Designated States
Title
(EN) IMPROVED METHOD FOR MAKING PHOSPHORIC ACID
(FR) PROCEDE PERFECTIONNE DE FABRICATION D'ACIDE PHOSPHORIQUE
Abstract
(EN) The invention concerns a method for making phosphoric acid comprising, in at least two successive pairs of solid/liquid reactor-separator: in the first reactor, attacking between 60 and 80 % the proportion of tricalcic phosphate with sulphuric acid in a reaction medium, wherein the water is supplied by the whole amount of water for washing the mixture of the slurry from the first reactor and the cake extracted from the second liquid/solid separator; reacting in the second reactor, the complement at 100 % of the proportion of tricalcic phosphate and the amount of sulphuric acid required for the attack, in the presence of all or part of the intermediate phosphoric acid produced and collected by liquid/solid separation of the slurry from the first reactor; finally, by solid/liquid separation of the slurry derived from the second reactor, collecting the final phosphoric acid produced; in parallel, extracting the cake formed on the second separator and dispersing same in the slurry derived from the first reactor before liquid/solid separation.
(FR) Procédé de fabrication d'acide phosphorique consistant, dans au moins deux couples réacteur-séparateur solide/liquide successifs, : - dans le premier réacteur, à attaquer entre 60 et 80 % du débit de phosphate tricalcique avec de l'acide sulfurique dans un milieu réactionnel, dont l'eau est fournie par la totalité de l'eau de lavage du mélange de la bouillie provenant de ce premier réacteur et du gâteau extrait du second séparateur liquide/solide, - à faire réagir dans le second réacteur, le complément à 100 % du débit de phosphate tricalcique et la quantité d'acide sulfurique nécessaire à l'attaque, en présence de tout ou partie de l'acide phosphorique intermédiaire produit et recueilli par séparation liquide solide de la bouillie provenant du premier réacteur, - enfin, par séparation solide/liquide de la bouillie issue du second réacteur, à recueillir l'acide phosphorique final produit, - parallèlement, à extraire le gâteau formé sur le second séparateur et le disperser dans la bouillie issue du premier réacteur avant séparation liquide/solide.
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