Patent ID: 11939405
Assignee: LENZING AKTIENGESELLSCHAFT
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  D | IPC C  D

Claim 0:
1. A method of pulping a cotton-based raw material for producing dissolving pulp, said method comprising:
a. an incubation step for generating the dissolving pulp by incubating the cotton-based raw material with an alkaline solution in combination with a gaseous oxidizing agent in a pressurized vessel
i. at a temperature of about 90-about 185° C.,
ii. for an incubation time of about 45-about 270 min,
iii. in the presence of a cellulose-stabilizing additive,
iv. at a concentration of alkali of about 1-about 35% (w/w) of the cotton-based raw material, and
v. at an initial gas pressure of about 1-about 21 bar (about 0.1 MPa-about 2.1 MPa), thereby generating the dissolving pulp; and

b. a step of washing the dissolving pulp,
wherein the cotton-based raw material is a pre- or post-consumer material,
wherein step a. is the only step for generating the dissolving pulp.