METHOD FOR PRODUCING POLYETHER POLYOL WITH A HIGH ETHYLENE OXIDE CONTENT Russian patent published in 2023 - IPC C08G65/26 C08G18/48 

FIELD: biochemistry.

SUBSTANCE: invention concerns a process for production of a polyether polyol used in the production of polyurethane foam. The process includes continuous feeding into a reactor which contains a composite metal cyanide complex catalyst and (i) a poly(oxyalkylene) polyol or (ii) a polyether polyol obtained by the method invented, (a) ethylene oxide, (b) substituted alkylene oxide, (c) optionally, parent compound having a hydroxyl functionality of 1 to 8. The mass ratio of the total amount of ethylene oxide supplied to the total amount of substituted alkylene oxide supplied is from 50:50 to 95:5. The time-averaged ethylene oxide concentration is below 13,000 ppm by mass (ppm) per minute, the ethylene oxide concentration is averaged over a period of time T of continuous ethylene oxide supply, the ethylene oxide concentration being defined as the weight of ethylene oxide in the reactor based on the total weight of the reactor contents. EFFECT: method allows to produce a polyether polyol with a high ethylene oxide content using a composite metal cyanide complex catalyst, which can be used to produce a wide range of flexible polyurethane foams.

7 cl, 10 tbl, 2 ex