METHOD FOR PRODUCING POLYETHER POLYOLS Russian patent published in 2021 - IPC C08G65/30 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method for producing polyether polyols. This method includes the following stages: providing an uncleaned mixture of polyether polyols containing polyether polyols and a basic catalyst; mixing the uncleaned mixture of polyether polyols with an aqueous acid solution with neutralization of the main catalyst and providing a neutralized mixture of polyether polyols; removing at least part of water from the neutralized mixture of polyether polyols, providing a dehydrated neutralized mixture of polyether polyols, including polyether polyols and a suspension of crystallized salts suspended in polyether polyols, wherein salts are formed as a result of neutralization of the main catalyst with acid; separating polyether polyols from crystallized salt by filtration to form a filtration crust containing crystallized salts and remaining polyether polyols around the crystals; removing from the filter at least part of polyether polyols leaving the filtration crust; re-dissolving the filtration crust to obtain a mixture of a salt solution and remaining polyether polyols; separating remaining polyether polyols from the salt solution; removing at least part of remaining separated polyether polyols from the salt solution.

EFFECT: development of a method for processing polyether polyols, in which the yield of the technological process for obtaining polyether polyols is increased, and it is possible to avoid losses of polyether polyols; creating a technological process where waste that does not contain polyols is formed in the form of an aqueous solution, is easier to treat as wastewater in standard installations.

13 cl, 2 dwg