	US 11,702,338 B2
	Preparation of phosphoric acid
Driss Dhiba, Casablanca (MA); Benoît Magny, Cailloux-sur-Fontaines (FR); Hamid Mazouz, Casablanca (MA); Céline Methivier, Lyons (FR); and Jacques Mongoin, Quincieux (FR)
Assigned to Coatex; and OCP SA
Appl. No. 16/762,751
Filed by Coatex, Genay (FR); and OCP SA, Casablanca (MA)
PCT Filed Nov. 9, 2018, PCT No. PCT/FR2018/052794 § 371(c)(1), (2) Date May 8, 2020, PCT Pub. No. WO2019/092380, PCT Pub. Date May 16, 2019.
Claims priority of application No. 1760550 (FR), filed on Nov. 9, 2017.
Prior Publication US 2021/0171349 A1, Jun. 10, 2021
Int. Cl. C01B 25/222 (2006.01); C01B 25/22 (2006.01); C08F 20/06 (2006.01); C08K 3/32 (2006.01)

CPC C01B 25/222 (2013.01) [C01B 25/22 (2013.01); C08F 20/06 (2013.01); C08K 2003/329 (2013.01)]

22 Claims

1. A method for preparing an aqueous phosphoric acid solution comprising treating at a temperature ranging from 40 to 100° C., an aqueous suspension (A) with a strong acid to form an aqueous phosphoric acid solution and phosphogypsum particles,

wherein the aqueous suspension (A) comprises water and particles of at least one phosphate material whose size is between 10 and 400 μm dispersed in the presence of at least one anionic polymer with a molecular mass by weight (M_W) 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.