Method for producing methoxypolyethylene glycols

US8952205B2 · kind B2 · utility

Assignee

• XIAMEN JU SHENG MECHANICAL ENGINEERING CO., LTD. · CN

Inventors

• I-Min Tsai · Xiamen, CN
• Kun-Yi Li · Tainan, TW
• Yanzhen Huang · Xiamen, CN
• Xiaobin Wang · Chanhassen, US
• Kechang Li · Xiamen, CN
• Weiming Wu · Longbeilingcun, CN

Key dates

• Filing date: Jan 27, 2014
• Grant date: Feb 10, 2015
• Expiry date: Jan 27, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C41/03
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A method for producing methoxypolyethylene glycols includes 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 ingredients including methanol and a catalyst comprised of sodium methoxide in methanol into the reactor, and heating the ingredients; (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; (4) introducing additional ethylene oxide into the reactor at a rate of 8000˜12000 kg/h to continue the reaction and provide final reaction products; (5) reducing the pressure in the reactor and adjusting pH of the reaction products to a ph of 5 to 7; and (6) transferring the reaction products to a tank yard.