Clean production method of dipentaerythritol hexaacrylate
A technology of dipentaerythritol hexa and dipentaerythritol, which is applied in the field of clean production of dipentaerythritol hexaacrylate, can solve the problems of high treatment cost, environmental pollution of water bodies, and high manufacturing cost, and achieves guaranteed yield and quality, high yield and environmental protection. Excellent effect
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Embodiment 1
[0037] Put 500 kg of toluene, 290 kg of cyclohexane, 348.3 kg of dipentaerythritol, 651.7 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; The bottom distributor continuously feeds compressed air into the kettle, raises the temperature to 85-95°C and starts reflux dehydration, the esterification reaction lasts for 9-10 hours, the kettle temperature is 95-105°C, when the reflux dehydration reaches anhydrous, the acid value is detected to be 30 ~60mgKOH / 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; Water and solvent are distilled under reduced pressure at -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 solvent can be used directly in the next esterification re...
Embodiment 2
[0039]162 kilograms of methylcyclopentane, 198 kilograms of toluene, 550 kilograms of dipentaerythritol, 1185 kilograms of acrylic acid, 7.2 kilograms of p-hydroxyanisole, 1.8 kilograms of hypophosphorous acid, and 25.6 kilograms of methanesulfonic acid were dropped into the 3000L reactor; The sparger at the bottom of the kettle continuously feeds compressed air into the kettle, raises the temperature to 85-95°C and starts reflux dehydration, the esterification reaction lasts for 9-10 hours, the kettle temperature is 95-105°C, and when the reflux dehydration reaches anhydrous, the acid value is detected 30~60mgKOH / g, after the reaction is over, cool to 40°C; add 43 kg of caustic soda and 108 kg of water, stir for 30 minutes; add 17.3 kg of magnesium polysilicate, stir and adsorb for 30 minutes; Distill water and solvent at 50-95°C under reduced pressure. After the recovered water and solvent are separated, the water can be used directly in the next neutralization without any tr...
Embodiment 3
[0041] Put 630 kg of cyclohexane, 570 kg of methylcyclohexane, 295.5 kg of dipentaerythritol, 603 kg of acrylic acid, 15 kg of p-hydroxyanisole, 15 kg of hypophosphorous acid, and 150 kg of benzenesulfonic 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 30-60 mgKOH / g, after the reaction is over, cool to 40°C; add 68 kg of caustic soda and 205 kg of water, and stir for 30 minutes; add 6.8 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 sol...
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