Direct Synthesis of Ethylene Glycol Monomethyl Ether by Composite Catalyst AlCl_3/( NH_4)_2HPO_4

The non- oil route process for synthesis of Ethylene glycol monomethyl ether are developed, which takes ethylene glycol from coal and methanol as the raw materials. AlCl3/( NH4)2HPO4as composite catalyst,the effects of different proportion of the catalyst,reaction temperature,pressure,time on the yield of the product are studied. The results show that the best catalytic performance is the mass ratio of AlCl3and( NH4)2HPO4is 1 ∶ 2. 5,dosage of catalyst is 4% of ethylene glycol,the mole ratio of ethylene glycol and methanol is 1 ∶ 4,temperature is 270 ℃,pressure is 7 MPa,reaction time is 4 hours,conversion of ethylene glycol is 37%,selectivity of ethylene glycol monomethyl ether is 82%,the yield of ethylene glycol monomethyl ether is 30%. The reaction mechanism is preliminary discussion.