Method for separating ethylene glycol and 1,2-butanediol by extractive distillation
A technology of extractive distillation and extractive distillation column, which is applied in the field of separation of ethylene glycol and 1,2-butanediol, can solve the problems of low recovery rate of ethylene glycol, poor separation effect, high equipment investment, etc., and achieve energy saving Significant effects and economic benefits, improved separation effect, and reduced energy consumption
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Embodiment 1
[0026] Such as figure 1 , the extractive distillation column has 52 theoretical plates, the reflux ratio is 1.75, and the extractant is sulfolane, which feeds from the 19th theoretical plate (numbered from the top to the bottom of the tower), and the flow rate is 20.5 kmol / h; ethylene glycol and 1, A mixture of 2-butanediol, with a mole fraction of 1,2-butanediol 50% and ethylene glycol 50%, is fed from the 38th theoretical plate with a flow rate of 10 kmol / h. The pressure at the top of the extractive distillation tower is 10kPa, the temperature at the top of the tower is 132.2°C, and the temperature at the bottom of the tower is 169.8°C. 99.9mol% of 1,2-butanediol is produced at the top of the tower, and the output is 5kmol / h; The mixture of alcohol and sulfolane enters the extractant recovery tower from the 8th theoretical plate. The extractant recovery tower has 15 theoretical plates, the reflux ratio is 0.62, the pressure at the top of the tower is 10kPa, the temperature a...
Embodiment 2
[0028] Such as figure 1, the extractive distillation column has 62 theoretical plates, the reflux ratio is 0.43, the extractant is trimethylolpropane, fed from the fifth theoretical plate, and the flow rate is 11 kmol / h; ethylene glycol and 1,2-butanediol The mixture, the mole fraction is 1,2-butanediol 90% and ethylene glycol 10%, is fed from the 20th theoretical plate, and the flow rate is 10kmol / h. The pressure at the top of the extractive distillation tower is 6kPa, the temperature at the top of the tower is 120.9°C, and the temperature at the bottom of the tower is 199.5°C. Obtain the mixture of ethylene glycol and trimethylolpropane, enter the extractant recovery tower from the 6th theoretical plate, the extractant recovery tower has 9 theoretical plates, the reflux ratio is 1.21, the pressure at the top of the tower is 6kPa, and the temperature at the top of the tower is 121.3°C. The temperature at the bottom of the tower is 211.9°C, the output at the top of the tower ...
Embodiment 3
[0030] Such as figure 1 , the extractive distillation column has 70 theoretical plates, the reflux ratio is 11.90, the extractant is a mixture of butanetriol and glycerol, wherein glycerol accounts for 90mol%, feeds from the fifth theoretical plate, and the flow rate is 28kmol / h ; The mixture of ethylene glycol and 1,2-butanediol, the mole fraction is 1,2-butanediol 20% and ethylene glycol 80%, fed from the 43rd theoretical plate, the flow rate is 10kmol / h. The pressure at the top of the extractive distillation tower is 1kPa, the temperature at the top of the tower is 86.9°C, and the temperature at the bottom of the tower is 155.3°C. Obtain the mixture of ethylene glycol, glycerol and butanetriol and enter the extractant recovery tower from the 11th plate. The extractant recovery tower has 20 theoretical plates, the reflux ratio is 0.31, the top pressure is 1kPa, and the top temperature is 86.6°C. The temperature at the bottom of the tower is 175.7°C, the output at the top of...
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