US 12,221,514 B2
Process for purifying polyether polyols
Marinus A. Bigi, Pearland, TX (US); and Arjun Raghuraman, Pearland, TX (US)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 17/596,357
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Jul. 29, 2020, PCT No. PCT/US2020/043936
§ 371(c)(1), (2) Date Dec. 8, 2021,
PCT Pub. No. WO2021/021845, PCT Pub. Date Feb. 4, 2021.
Claims priority of provisional application 62/881,696, filed on Aug. 1, 2019.
Prior Publication US 2022/0227929 A1, Jul. 21, 2022
Int. Cl. C08G 65/30 (2006.01); B01J 31/02 (2006.01); C08G 18/48 (2006.01); C08G 65/26 (2006.01)
CPC C08G 65/30 (2013.01) [B01J 31/0225 (2013.01); C08G 18/48 (2013.01); C08G 65/2645 (2013.01)] 10 Claims
 
1. A process for purifying a polyether polyol, the process comprising:
treating the polyether polyol with a mixture of (i) a sulfonic acid catalyst, the catalyst including a substituted or unsubstituted alkyl group of at least 6 carbon atoms, and (ii) water to reduce residual levels of acetal linkages present in the polyether polyol.