US 12,146,027 B2
Purification process for polyether-carbonate polyols
Marinus A. Bigi, Pearland, TX (US); and Nima Nikbin, Lake Jackson, TX (US)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 17/424,259
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Jan. 6, 2020, PCT No. PCT/US2020/012339
§ 371(c)(1), (2) Date Jul. 20, 2021,
PCT Pub. No. WO2020/159669, PCT Pub. Date Aug. 6, 2020.
Claims priority of provisional application 62/799,172, filed on Jan. 31, 2019.
Prior Publication US 2022/0089813 A1, Mar. 24, 2022
Int. Cl. C08G 64/40 (2006.01); B01J 20/18 (2006.01); B01J 20/26 (2006.01); C08G 64/02 (2006.01); C08G 64/30 (2006.01); C08G 64/34 (2006.01); C08G 65/30 (2006.01)
CPC C08G 64/406 (2013.01) [B01J 20/18 (2013.01); B01J 20/267 (2013.01); C08G 64/0208 (2013.01); C08G 64/302 (2013.01); C08G 64/34 (2013.01); C08G 65/30 (2013.01)] 5 Claims
 
1. A process for removing an alkylene carbonate from a polyether-carbonate, comprising contacting a starting polyether-carbonate that contains at least 0.25 weight-%, based on the weight of the starting polyether carbonate, of one or more alkylene carbonates, with a solid absorbent that contains pores having an average pore size of at least 1 nm up to 100 nm at a temperature of 30 to 150° C. and at which temperature the starting polyether-carbonate is a liquid, wherein the solid absorbent has a pore volume of 0.25 to 2 mL/g and is selected from the group consisting of an unfunctionalized, crosslinked porous polymer that lacks ion exchange capacity in the form of a particulate solid and a crosslinked porous polymer which which crosslinking porous polymer is is a crosslinked porous anion exchange resin in the form of a particulate solid.