A method for liquid-liquid extraction-extractive distillation separation of propylene glycol methyl ether and water
A technology of propylene glycol methyl ether and extractive distillation, which is applied in the liquid-liquid extraction-extractive distillation separation of propylene glycol methyl ether and water in rectification towers, and in the field of liquid-liquid extraction-extractive distillation separation of propylene glycol methyl ether and water, to achieve Effects of high-purity separation and energy consumption reduction
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Embodiment 1
[0042] In the liquid-liquid extraction tower with 10 trays, the propylene glycol methyl ether-water mixture with a flow rate of 1000 kmol / h enters from the first plate, and the feed contains 7.8mol% of water and 92.2mol% of propylene glycol methyl ether. The agent 2-ethylhexanoic acid enters from the 10th plate, the flow rate is 350 kmol / h, the temperature at the top of the tower is 45°C, and the temperature at the top of the tower is 40°C; the theoretical plate number of the extractive distillation column is 20, and the feed position of the mixture is 12 , the extraction agent 2-ethylhexanoic acid enters from the fifth plate, the flow rate is 60 kmol / h, the reflux ratio is 0.3, the temperature at the top of the tower is 95°C, and the temperature at the bottom of the tower is 175°C; the number of theoretical plates in the rectification column is 25, The number of feed plates is 17, the reflux ratio is 0.7, the temperature at the top of the tower is 120°C, and the temperature at...
Embodiment 2
[0045] In the liquid-liquid extraction tower with 12 trays, the propylene glycol methyl ether-water mixture with a flow rate of 1000 kmol / h enters from the first plate, with 7.8mol% water and 92.2mol% propylene glycol methyl ether in the feed, The extraction agent 2-ethylhexanoic acid enters from the 12th plate, the flow rate is 500 kmol / h, the temperature at the top of the tower is 40°C, and the temperature at the bottom of the tower is 35°C; the number of theoretical plates of the extractive distillation column is 18, and the feed position of the mixture is 10. The extraction agent 2-ethylhexanoic acid enters from the fourth plate, the flow rate is 80 kmol / h, the reflux ratio is 0.7, the temperature at the top of the tower is 100°C, and the temperature at the bottom of the tower is 178°C; the number of theoretical plates in the rectification column is 20 , the feed plate is 12, the reflux ratio is 1, the temperature at the top of the tower is 122°C, and the temperature at the...
Embodiment 3
[0048] In the liquid-liquid extraction tower with 8 trays, the propylene glycol methyl ether-water mixture of flow rate 1000kmol / h enters from the 1st plate, and the water content is 7.8mol% and propylene glycol methyl ether 92.2mol% in the feed, The extraction agent 2-ethylhexanoic acid enters from the eighth plate, the flow rate is 550 kmol / h, the temperature at the top of the tower is 48°C, and the temperature at the bottom of the tower is 42°C; the number of theoretical plates of the extractive distillation column is 20, and the feed position of the mixture is 12. The extraction agent 2-ethylhexanoic acid enters from the third plate, the flow rate is 100 kmol / h, the reflux ratio is 1.0, the temperature at the top of the tower is 105°C, and the temperature at the bottom of the tower is 180°C; the number of theoretical plates in the rectification column is 20 , the feed plate is 12, the reflux ratio is 1.2, the temperature at the top of the tower is 115°C, and the temperature...
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