METHOD OF METACRYLIC ACID'S MONOESTER AND ETHYLENE GLYCOL OR DIETHYLENE GLYCOL CONTINUOUS REFINING

摘要

A method of continuous refining of monoester of methacrylic acid and ethylene glycol or diethylene glycol, where the raw monoester is brought into intensive counterflowing contact with an organic solvent of alkane type by means of vibratory movement and then a solvent of ether type or higher ketones, also by means of vibratory movement, based on the fact that the liquid phase from re-esterification is brought into intensive counterflowing contact with a solvent of alkane type containing at least 30 % by weight monoester, to which is added 50 to 150 ppm inhibitor of phenol type, best p-methoxy phenol, further, that the organic phase, of alkane type, after contact with the liquid phase from esterification, is brought into intensive counterflowing contact by means of vibratory movement with water containing 50 to 150 ppm inhibitor in a mass ratio of water flow to organic phase of 1 : 0.5 to 1 : 4, preferably 1 : 2.5, whereupon the occurring aqueous solution is joined with the liquid phase from esterification, further, that the aqueous phase, after counterflowing contact with the solvent of alkane type, is mixed again with the inhibitor of phenol type into a solution containing 50 to 150 ppm, preferably 100 ppm inhibitor, whereupon this aqueous phase is bought into the same counterflowing contact by means of vibration with the oxygenous solvent of ether type or higher ketone.