	US 11,787,889 B2
	Process for the preparation of polyacrylamides using an eco-friendly lubricant composition
Cédrick Favero, Andrezieux Boutheon (FR); Thierry Bessenet, Andrezieux Boutheon (FR); Frédéric Daguerre, Andrezieux Boutheon (FR); Jing Ling, Taixing (CN); and Nicolas Boisse, Taixing (CN)
Assigned to SNF GROUP, Andrezieux Boutheon (FR)
Appl. No. 17/906,941
Filed by SNF GROUP, Andrezieux Boutheon (FR)
PCT Filed Mar. 23, 2021, PCT No. PCT/EP2021/057479 § 371(c)(1), (2) Date Sep. 21, 2022, PCT Pub. No. WO2021/197938, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 202010251862.7 (CN), filed on Apr. 1, 2020.
Prior Publication US 2023/0114065 A1, Apr. 13, 2023
Int. Cl. C08F 220/56 (2006.01); C10M 167/00 (2006.01); C08J 3/12 (2006.01); C10M 105/34 (2006.01); C10M 105/40 (2006.01); C10M 107/48 (2006.01); C10M 111/04 (2006.01)

CPC C08F 220/56 (2013.01) [C08J 3/122 (2013.01); C10M 105/34 (2013.01); C10M 105/40 (2013.01); C10M 107/48 (2013.01); C10M 111/04 (2013.01); C08J 2333/26 (2013.01); C10M 2207/2815 (2013.01); C10M 2207/2835 (2013.01); C10M 2225/0405 (2013.01)]

20 Claims

1. A process for preparing water-soluble polymers in powder form by polymerization of water-soluble monoethylenically unsaturated monomers comprising the successive steps:

a) spraying on the inner wall of the polymerization vessel the lubricant composition LC1 comprising: 25-40 weight % alkyl oleate/50-65 weight % polyoxyethylene oleyl ether phosphate/and 5-15 weight % sorbitan monolaurate,

b) polymerizing in aqueous solution, in the polymerization vessel, in the presence of polymerization initiators at an initiation temperature between −20° C. and 50° C., at least one water-soluble monounsaturated ethylenic monomer, the total mass concentration of monomer relative to the polymerization charge being between 10 and 60%,

c) discharging the polymer gel from the polymerization vessel,

d) granulating the polymer gel thus obtained in a granulator, in presence of a lubricant composition LC2 comprising: 15-35 weight % alkyl oleate/15-45 weight % polyoxyethylene oleyl ether phosphate/35-55 weight % sorbitan monolaurate,

e) drying the polymer gel to obtain a polymer in powder form, and

f) grinding and sifting the powder.