Process for synthesizing propylene glycol monomethyl ether acetate (PMA)
A technology of propylene glycol methyl ether acetate and propylene glycol methyl ether, which is applied in the production process field of propylene glycol methyl ether acetate, can solve problems such as polluting the environment and affecting products, and achieves high activity, improved selectivity and conversion rate, and good selectivity Effect
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[0015] (1) After adding 18 tons of propylene glycol methyl ether (PM), 12.1 tons of acetic acid, and 500 kilograms of entrainer toluene in the esterification reaction kettle, add 122 kilograms of p-toluenesulfonic acid.
[0016] (2) Heating and raising the temperature to 103 degrees to carry out the reaction, dehydration is carried out at the same time, and water and toluene are separated. After 16 to 20 hours of esterification, the reaction temperature was raised to 150 degrees. After the esterification reaction is completed, the reaction material is input into the light-removing tower. The excess propylene glycol methyl ether is recovered while the reactants are pumped to the rectification column.
[0017] (3) after the reactant is rectified, the rectification tower tower still residue liquid is collected and packed into barrels for measurement, (the still residue discharge is 56+4+6+6, and 300 tons of products are discharged about 3 tons of still residues), initially 5 bat...
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