H-ZSM-5 Catalyst in Synthesis of Diethylene Glycol Methyl Ether Acetate

optimizing Si/Al is 25, 38, 50, 80 four kinds of models of Na type molecular sieve, 1 mol/L concentration of ammonium nitrate by immersion, mixing, filtering, by means of the modified roasting, prepared a variety of models of H-ZSM-5 catalyst for synthesis of diethylene glycol methyl ether acetate(DGMEA). Carrier system research H-ZSM-5 zeolite catalyst in diethylene glycol dimethyl ether and direct esterification of acetic acid catalytic activity and preparation method of catalyst, the synthesis of DGMEA optimum conditions and catalyst, improve the raw material conversion rate, using XRD, TEM, FTIR and N-2 adsorption-stripping way of catalyst, such as the characterization of the system. Experimental results show that in addition to the reaction temperature, time, alcohol acid mole ratio, catalyst mass, H-ZSM-5 zeolite catalyst, acid strength, stripping rate and competitive system will influence the final reaction of ester yield and selectivity. Under 85 similar to 92 degrees C. temperature, using cyclohexane as dehydrant, alkyd ratio of 1: 1.1, catalyst mass was 2 %, bear the load of acid amount was 15 %, 60 minutes, DGMEA yield up to 96.94 %, 100 % acetic acid conversion rate. This is mainly because acid combined with molecular sieve much channel structure play a role in the reaction.