	US 12,460,019 B2
	Preparation of regenerated polysaccharides
Dirk Hollmann, Bad Doberan (DE); Mai Ngoc Nguyen, Rostock (DE); and Udo Kragl, Kritzmow (DE)
Assigned to Universitaet Rostock, Rostock (DE)
Appl. No. 17/788,399
Filed by Universität Rostock, Rostock (DE)
PCT Filed Dec. 23, 2020, PCT No. PCT/EP2020/087783 § 371(c)(1), (2) Date Jun. 23, 2022, PCT Pub. No. WO2021/130323, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 102019135776.4 (DE), filed on Dec. 23, 2019; and application No. 102020103195.5 (DE), filed on Feb. 7, 2020.
Prior Publication US 2023/0050320 A1, Feb. 16, 2023
Int. Cl. C08B 16/00 (2006.01)

CPC C08B 16/00 (2013.01)

16 Claims

1. A process for producing a solid regenerated polysaccharide, comprising the steps of:

S1) providing a polysaccharide,

S2) dissolving the polysaccharide in at least one electrolytic solvent, wherein the electrolytic solvent is a quaternary onium hydroxide in a content of about 40-80% by weight in water to produce a polysaccharide solution,

S3) precipitating the polysaccharide in gelated form by contacting the polysaccharide solution with a suitable concentration of an electrophilic reagent, wherein the electrophilic reagent is at least one cyclic organic carbonate, or at least one polymer of a cyclic organic carbonate to obtain a regenerated polysaccharide, and

S4) washing the regenerated polysaccharide.