Patent ID: 8952205
Filing Date: 2015-02-10
Classification: C07C

Abstract:
1. A method for producing methoxypolyethylene glycols, comprising, the steps of, in the order recited: (1) preparing a reactor by washing the reactor with water, pressurizing the reactor with nitrogen, and evacuating to completely remove water and reduce oxygen content in the reactor; (2) pressurizing the reactor with nitrogen, introducing reagents methanol and a catalyst comprised of sodium methoxide in methanol into the reactor, and heating the reagents; (3) introducing ethylene oxide into the reactor at a rate of 800˜1200 kg/h and reacting the methanol and the ethylene oxide to completely react the methanol and provide initial reaction products; (4) introducing additional ethylene oxide into the reactor at a rate of 8000˜12000 kg/h to continue the reaction, after the methanol is completely reacted in step (3), to provide final reaction products; (5) reducing the pressure in the reactor and adjusting pH of the final reaction products to a pH of 5 to 7 after the reaction is finished; and (6) transferring the final reaction products to a tank yard.