Method for synthesizing high-molecular-weight pentaerythritol polyoxyethylene ether
A technology of pentaerythritol polyoxyethylene ether and high molecular weight, which is applied in the field of synthesis of high molecular weight pentaerythritol polyoxyethylene ether, can solve the problems of dark product color, difficult solvent recovery and processing, complex process, etc., to reduce the generation of side reactants, Fewer varieties, the effect of improving economic efficiency
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Embodiment 1
[0034] Embodiment 1: the first step, prepare materials, pentaerythritol is 15%, potassium hydroxide is 0.5%, ethylene oxide is 84%, and glacial acetic acid is 0.5%, under the condition of 90 ℃ of temperature in reactor, in reactor Vacuumize to -95KPa, put in 0.5% potassium hydroxide, stir, use negative pressure to put 15% pentaerythritol into the kettle, after feeding, pump negative pressure to -95KPa in the reactor, replace with nitrogen gas in the reactor, repeat replacement for 4 Then pressurize to make the pressure of the reactor reach -50KPa, control the temperature of the reactor at 80°C, first put in 2.8% ethylene oxide, raise the temperature to 90°C, trigger the reaction activation period, and then continue to put 81.2% cyclooxygen into the reactor Oxygen, during the feeding process, the temperature gradually rises from 90°C to 120°C, and then the temperature of the reactor is controlled to no longer rise, and the pressure in the reactor cannot exceed 350KPa. After the ...
Embodiment 2
[0036] Embodiment 2: prepare materials, pentaerythritol is 17%, potassium hydroxide is 0.5%, oxirane is 82%, glacial acetic acid is 0.5%, under the condition of 90 ℃ of temperature in the reactor, vacuumize in the reactor to - 95KPa, put in 0.5% potassium hydroxide, stir, use negative pressure to put 17% pentaerythritol into the kettle, after feeding, pump the negative pressure to the reaction kettle to -95KPa, replace it with nitrogen in the reaction kettle, repeat the replacement 4 times, and then add Make the pressure of the reaction kettle reach -50KPa, control the temperature of the reaction kettle at 80°C, first put 2.8% ethylene oxide into it, raise the temperature to 90°C, trigger the reaction activation period, and then continue to put 79.2% ethylene oxide into the kettle, During the feeding process, the temperature gradually rises from 90°C to 120°C, and then the temperature of the reactor is controlled to stop rising. The pressure in the reactor should not exceed 350...
Embodiment 3
[0038]Embodiment 3: the first step, prepare materials, pentaerythritol is 16%, potassium hydroxide is 0.5%, ethylene oxide is 83%, and glacial acetic acid is 0.5%, under the condition of 90 ℃ of temperature in reactor, in reactor Vacuumize to -95KPa, put in 0.5% potassium hydroxide, stir, use negative pressure to put 16% pentaerythritol into the kettle, after feeding, pump negative pressure to -95KPa in the reactor, replace with nitrogen gas in the reactor, repeat replacement for 4 Then pressurize to make the pressure of the reactor reach -50KPa, control the temperature of the reactor at 80°C, put in 2.8% ethylene oxide first, raise the temperature to 90°C, trigger the reaction activation period, and then continue to put 80.2% cyclooxygen into the reactor Oxygen, during the feeding process, the temperature gradually rises from 90°C to 120°C, and then the temperature of the reactor is controlled to no longer rise, and the pressure in the reactor cannot exceed 350KPa. After the f...
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