US 12,070,701 B2
Process for the recovery of solvent from solvent-containing cellulosic particles
Roland Feiner, Lenzing (AT); Thi Huyen Trang Trinh, Lenzing (AT); and Christian Sperger, Schorfling (AT)
Assigned to Lenzing Aktiengesellschaft, Lenzing (AT)
Appl. No. 17/771,348
Filed by LENZING AKTIENGESELLSCHAFT, Lenzing (AT)
PCT Filed Oct. 21, 2020, PCT No. PCT/EP2020/079559
§ 371(c)(1), (2) Date Apr. 22, 2022,
PCT Pub. No. WO2021/078767, PCT Pub. Date Apr. 29, 2021.
Claims priority of application No. 19205226 (EP), filed on Oct. 25, 2019.
Prior Publication US 2022/0387905 A1, Dec. 8, 2022
Int. Cl. B01D 11/02 (2006.01); D01F 13/02 (2006.01)
CPC B01D 11/0219 (2013.01) [B01D 11/0292 (2013.01); D01F 13/02 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A process for recovering a solvent from solvent-containing cellulosic particles, wherein the solvent is a direct dissolution solvent, comprising the steps:
a) initially extracting the solvent from the solvent-containing cellulosic particles by means of a liquid extraction medium consisting essentially of water, thereby obtaining a solvent-enriched extraction medium, and
b) obtaining a recovered solvent from the solvent-enriched extraction medium,
wherein in step a) the solvent is extracted from the solvent-containing cellulosic particles in a continuous flow extraction reactor, wherein the liquid extraction medium continuously flows through the continuous flow extraction reactor to extract the solvent from the solvent-containing cellulosic particles.