【Q&A Question 059】June 18, 2016
Thread Content
【Q&A Question 059】June 18, 2016: What are the factors that affect the top temperature of a fractional distillation tower? The answer key will be available after responding; scoring is based on answering the key points. (1) The amount of reflux at the top of the tower ； (2) Whether there is fluctuation in the reflux temperature ； (3) Does the reflux contain water? ； (4) Feed temperature variation ； (5) Whether the feed rate is stable or not ； (6) Changes in the properties of the feedstock ； (7) Whether the cooler outlet temperature is stable ； (8) Is the feed containing water? ； (9) Whether there is a change in tower pressure ； (10) Whether the instrument is easy to use.
Feed temperature, reflux volume, reflux temperature,
Feed temperature, top reflux, bottom temperature, feed composition, water carried in the reflux
1 Top pressure 2 Cooling reflux temperature and flow rate 3 Top circulation oil temperature and flow rate
The internal factor is the overhead composition, while the external factor is the reflux ratio.
1. Changes in the reflux flow rate and temperature at the top of the tower, or water carried back by the reflux stream; 2. Changes in the composition and temperature of the feed, or water carried back by the feed stream; 3. Changes in the operating pressure of the tower, as well as the temperature or liquid level at the bottom of the tower.
The main factors include: (l) reflux flow at the tower top, temperature changes, or water carried in by the reflux; (2) feed composition, temperature changes, or water carried in by the feed; (3) operating pressure of the tower and changes in bottom temperature or liquid level, etc
(1) Fluctuations in cooling water pressure cause changes in the outlet temperature of the gasoline aftercooler and the overhead circulation heat exchanger oil； (2) System pressure changes ； (3) Changes in reflux volume ； (4) Gasoline return pump failure ；
Top of tower reflux flow rate, reflux temperature, top of tower pressure,
Bottom temperature, content of light components in the distillation feed, top pressure
Factors affecting it: 1. Bottom temperature of the tower； 2. Return flow rate ； 3. Tower pressure ； 4. Temperature of the recirculation medium ； 5. Feed temperature, etc