Method for cleanly producing methoxyl propanediol acrylate and analogs thereof

[0041] Put 500 kg of toluene, 290 kg of cyclohexane, 536.5 kg of methoxypropylene glycol (90 molecular weight), 463.5 kg of acrylic acid, 8 kg of p-hydroxyanisole, 4 kg of hypophosphorous acid, and 55 kg of p-toluenesulfonic acid into the 3000L reactor ; Turn on stirring, continuously feed compressed air into the kettle through the distributor at the bottom of the kettle, raise the temperature to 85-95°C and start reflux dehydration, the esterification reaction is 9-10 hours, the kettle temperature is 95-105°C, when the reflux dehydration reaches anhydrous When the acid value is 10-25mgKOH / g, after the reaction is over, cool to 40°C; add 25 kg of caustic soda and 60 kg of water, and stir for 30 minutes; add 6 kg of magnesium polysilicate, stir and absorb for 30 minutes; Above -0.098MPa, water and solvent are distilled under reduced pressure at 50-95°C. After the recovered water and solvent are separated, the water can be used directly in the next neutralization without any trea...

[0043] Put 585 kg of cyclohexane, 957.6 kg of methoxydipropylene glycol (molecular weight 148), 512.4 kg of acrylic acid, 6 kg of p-hydroxyanisole, 3 kg of sodium hypophosphite, and 30 kg of methanesulfonic acid into the 3000L reactor; start stirring , continuously feed compressed air into the kettle through the distributor at the bottom of the kettle, raise the temperature to 80-85°C and start reflux dehydration, the esterification reaction is 10-12 hours, the kettle temperature is 85-92°C, when the reflux dehydration reaches no water, the detection The acid value is 10-25mgKOH / g. After the reaction is over, cool to 40°C; add 32 kg of caustic soda and 75 kg of water, and stir for 30 minutes; add 6.5 kg of magnesium polysilicate, stir and absorb for 30 minutes; Above, water and solvent are distilled under reduced pressure at 50-95°C; after the recovered water and solvent are separated, the water can be used directly in the next neutralization without any treatment, and the solv...

[0045] Put 162 kg of methylcyclopentane, 198 kg of toluene, 1269 kg of methoxytripropylene glycol (molecular weight 206), 466 kg of acrylic acid, 7.2 kg of p-hydroxyanisole, 1.8 kg of hypophosphorous acid, and 1.8 kg of methanesulfonic acid into the 3000L reactor. 25.6 kg; start stirring, continuously feed compressed air into the kettle through the distributor at the bottom of the kettle, heat up to 85-95°C and start reflux dehydration, esterification reaction for 9-10 hours, kettle temperature 95-105°C, when reflux dehydration to no When the water comes out, the acid value is detected to be 10-25 mgKOH / g. After the reaction is over, cool to 40°C; add 43 kg of caustic soda and 108 kg of water, and stir for 30 minutes; add 17.3 kg of magnesium polysilicate, stir and absorb for 30 minutes; Vacuum degree above -0.098MPa, water and solvent are distilled under reduced pressure at 50-95°C. After the recovered water and solvent are separated, the water can be used directly in the next...