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AssigneesCoatex, Ocp SA
InventorsDriss Dhiba, Benoît Magny, Hamid Mazouz, Céline Methivier, Jacques Mongoin
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The invention relates to a method for the industrial preparation of phosphoric acid from an aqueous suspension comprising water and particles of at least one phosphate material dispersed in the presence of at least one additive of the anionic polymer type. Phosphoric acid is obtained by treating this suspension with at least one strong acid. The polymer is obtained by polymerization reaction of at least one acid selected from acrylic acid, methacrylic acid and salts thereof. The invention relates to the use of this anionic polymer as well as the method for improving the rheology of the suspension and the hydrodynamics of the reaction medium in which the reactions for the manufacture of phosphoric acid take place.
A method for preparing phosphoric acid comprising treating at a temperature ranging from 40 to 100° C., by means of at least one strong acid, an aqueous suspension (A) comprising water and particles of at least one phosphate material whose size is between 10 and 400 μm, and dispersed in the presence of at least one anionic polymer with a molecular mass by weight (MW) of between 1,000 and 90,000 g/mol and obtained by polymerization reaction of at least one acid chosen from acrylic acid, methacrylic acid and salts thereof.
A method for improving the hydrodynamics of the reaction for the preparation of phosphoric acid by treating at a temperature ranging from 40 to 100° C., by means of at least one strong acid, an aqueous suspension (A) of particles of at least one phosphate material having a size of between 10 and 400 μm, comprising the use of at least one anionic polymer with a molecular mass by weight (MW) of between 1,000 and 90,000 g/mol and obtained by polymerization reaction of at least one acid chosen from acrylic acid, methacrylic acid and salts thereof.
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Dependencies are inferred from the claim text.