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Synthesis of Tetraethylene Glycol Dimethyl Ether by Williamson Reaction

SONG Qingying, WU Xiaobei, WU Jiawu (Department of Applied Foundation, Shanghai Research Institute of Petroleum Chemical Technology, Shanghai 201208,China)  
Tetraethylene glycol dimethyl ether was synthesized by an improved Williamson reaction with tetraethylene glycol, methyl chloride and alkaline hydroxide at the suitable molar ratio ofn(C 8H 18 O 5)∶n(CH 3Cl)∶n(MOH)=1∶(2-3)∶(2-5). Under the pressure of 0 6 MPa, reacting for 3 h at the temperature 55-90 ℃,the conversion of tetraethylene glycol was greater than 99% and the selectivity of dimethyl ether was 786%.Moreover, the mixed tetraethylene and pentaethylene glycol dimethyl ether was synthesized with the by-product of tetraethylene glycol. The reaction was finished in about 2 h, and the selectivity of dimethyl ether was 935%.
【CateGory Index】: TQ223.24
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