Purification Technology Edition Daily Question (Short Answer) [2018-2-16]
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What are the factors that affect distillation operations? How to improve the purity of the overhead distillate?
Answer: Factors affecting distillation operation: 1. There must be gas rising from the bottom of the tower (it should generally be equipped with a reboiler that can generate steam), in order to ensure the temperature at the bottom of the tower； 2. There must be liquid reflux at the top of the tower (usually equipped with a gas cooler) to ensure the temperature at the tower top ； 3. Feed rate and feed composition; the feed point must be appropriate to ensure control over the above two aspects ； 4. The pressure must be kept consistent. Methods to ensure the purity at the tower top: 1. Increase the reflux liquid at the tower top ； 2. The fluid containing a higher amount of poorly volatile components should be fed into the lower part of the tower, while it is preferable to use a fluid with fewer poorly volatile components as the reflux liquid at the top of the tower.
Factors affecting distillation operation: temperature, pressure, feed composition, and feed rate. Methods to ensure the purity at the tower top: 1. Increase the reflux flow at the tower top. 2. The fluid containing a higher amount of poorly volatile components should be fed into the lower part of the tower, while it is preferable to use a fluid with fewer poorly volatile components as the reflux liquid at the top of the tower.
Factors affecting distillation operation: temperature, pressure, feed composition, and feed rate. Methods to ensure the purity at the tower top: 1. Increase the reflux flow at the tower top. 2. The fluid containing a higher amount of poorly volatile components should be fed into the lower part of the tower, while it is preferable to use a fluid with fewer poorly volatile components as the reflux liquid at the top of the tower.
Factors affecting distillation operation: temperature, pressure, feed composition, and feed rate. Methods to ensure the purity at the tower top: 1. Increase the reflux flow at the tower top. 2. The fluid containing a higher amount of poorly volatile components should be fed into the lower part of the tower, while it is preferable to use a fluid with fewer poorly volatile components as the reflux liquid at the top of the tower.
Reflux ratio, feed conditions, operating pressure. The operating conditions have reached stability: the temperature of the sensitive plate remains essentially constant, and the liquid level in the reactor bottom remains fairly stable.
Factors affecting distillation operation: 1. Bottom temperature of the tower； 2. Top reflux 3. Feed rate and feed composition, 4. Top pressure. Methods to ensure the purity of the distillate at the top of the tower: Keep the temperature of the sensitive plate essentially constant, and maintain the liquid level in the bottom of the tower at a constant level.
Distillation load, feed temperature, top temperature and pressure, bottom temperature and pressure, reflux rate, product yield, etc
Factors affecting distillation operation: 1. Gas must rise from the bottom of the tower to ensure the temperature at the tower base； 2. There must be liquid reflux at the top of the tower, in order to maintain the temperature there ； 3. Feed rate and feed composition; the feed point must be appropriate to ensure control over the above two aspects ； 4. The pressure must be kept consistent. Methods to ensure the purity at the tower top: 1. Increase the reflux liquid at the tower top ； 2. The fluid containing a higher amount of poorly volatile components should be fed into the lower part of the tower, while it is preferable to use a fluid with fewer poorly volatile components as the reflux liquid at the top of the tower.
Factors affecting distillation operation: 1. Gas must rise from the bottom of the tower to ensure the temperature at the tower base； 2. There must be liquid reflux at the top of the tower, in order to maintain the temperature there ； 3. Feed rate and feed composition; the feed point must be appropriate to ensure control over the above two aspects ； 4. The pressure must be kept consistent. Methods to ensure the purity at the tower top: 1. Increase the reflux liquid at the tower top ； 2. The fluid containing a higher amount of poorly volatile components should be fed into the lower part of the tower, while it is preferable to use a fluid with fewer poorly volatile components as the reflux liquid at the top of the tower.
Methods to ensure the purity at the tower top: 1. Increase the reflux liquid at the tower top； 2. The fluid containing a higher amount of poorly volatile components should be fed into the lower part of the tower, while it is preferable to use a fluid with fewer poorly volatile components as the reflux liquid at the top of the tower.