A method for realizing 2-picoline dehydration by utilizing the side draw of an azeotropic rectification tower
An azeotropic rectification tower and picoline technology, which is applied in the field of dehydration of 2-picoline by using the side line extraction of azeotropic rectification tower, can solve the problems such as the high water content of 2-picoline that affects recycling, etc. Achieve high product recovery rate, low production cost and good separation effect
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Embodiment 1
[0021] as attached figure 1 As shown, the 2-picoline / water solution with a mass fraction of 8% is continuously fed to an azeotropic distillation column containing 15 trays, the flow rate is 200kg / h, and the feeding position is the 9th tray; The entrainer cyclohexane is continuously fed to the rectification column from the first tray, the flow rate is 1472kg / h, and the amount of the entrainer is 8 times of the water quality at this time; the tower still heating device is turned on. The operating pressure of the rectification tower is 101.325kPa, the temperature at the top of the tower is 65°C, and the temperature at the bottom of the tower is 125°C.
[0022] Extraction and follow-up operations are as follows:
[0023] (1) All the gas phase at the top of the tower is taken out, then cooled to a liquid phase by heat exchanger 1, and then carried out in a phase separator for phase separation operation, and the phase separation time is 5 hours;
[0024] The gas phase at the top o...
Embodiment 2
[0029] The difference between this embodiment and embodiment one is that the 2-picoline / water solution with a mass fraction of 50% is continuously fed to an azeotropic rectification column containing 30 trays, with a flow rate of 100kg / h, The feeding position is the 11th tray; the entrainer cyclohexane is continuously fed to the rectification column from the first tray, the flow rate is 300kg / h, and the amount of the entrainer is 6 times the water quality ; Turn on the tower kettle heating device. The operating pressure of the rectification tower is 101.325kPa, the temperature at the top of the tower is 55°C, and the temperature at the bottom of the tower is 128°C.
[0030] Extraction and follow-up operations are as follows:
[0031] (1) All the gas phase at the top of the tower is taken out, then cooled to a liquid phase by heat exchanger 1, and then carried out in a phase separator for phase separation operation, and the phase separation time is 3 hours;
[0032] The gas p...
Embodiment 3
[0037] The difference between this embodiment and embodiment two is that the 2-picoline / water solution with a mass fraction of 99% is continuously fed to an azeotropic rectification column containing 10 trays, and the flow rate is 100kg / h. The feeding position is the fifth tray; the entrainer cyclohexane is continuously fed from the first tray to the rectification column at a flow rate of 10kg / h, and the amount of the entrainer is 10 times the water mass ; Turn on the tower kettle heating device. The operating pressure of the rectification tower is 101.325kPa, the temperature at the top of the tower is 62°C, and the temperature at the bottom of the tower is 130°C.
[0038] Extraction and follow-up operations are as follows:
[0039] (1) All the gas phase at the top of the tower is taken out, then cooled to a liquid phase by heat exchanger 1, and then carried out in a phase separator for phase separation operation, and the phase separation time is 0.5h;
[0040] The gas phase a...
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Abstract
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