【Q&A Question 131】2017.05.11
Thread Content
This post was last edited by 955559 on 2017-7-21 22:56. [Q&A Question 131] What are the methods to address the high dry point of the distillation overhead gasoline on 2017.05.11? The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) I. Operating steps: 1. Reduce the temperature at the top of the tower ； 2. Reduce the bottom temperature of the tower ； 3. Reduce the feed temperature ； 4. Strengthen concurrent dehydration ； 5. Increase the operating pressure of the tower ； 6. Appropriately increase the return flow rate. II. Requirements: 1. To maintain product quality and increase the operating pressure of the tower, it is necessary to raise the temperature accordingly ； 2. One should start with the main contradiction of the problem ； 3. It should be adjusted slowly. Scoring criteria: 2 Wealth points for incorrect attempts; 3–8 points for *incomplete* answers. 10 Wealth points for correct answers, provided with detailed explanations; 15–20 Wealth points if the answer is correct but lacks sufficient details. Please score according to these criteria. 2017 Q&A Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html
Reduce the top temperature, increase the pressure, lower the low-temperature value, and decrease the feed temperature
Reduce the high temperature at the top of the fractionation tower and lower the relatively high temperature at the bottom of the tower.
1. Influence of the temperature of the distillation column top draw: 1) Changes in the amount of material recycled to the top of the column and the temperature of that recycled material. A high temperature in the top reflux tower or a large amount of reflux will result in a higher dry point of the gasoline, while the opposite situation will lead to a lower dry point. 2) Changes in the cold return flow rate and the temperature after cooling. A high cold reflux temperature or a large amount of material returning to the tower will result in a lower dry point of the gasoline, while the opposite situation will lead to a higher dry point. 3) The temperature of the diesel extraction layer and the changes in the temperature of the material returning to the tower at the intermediate stage. High temperatures in the diesel extraction zone and at the mid-section return to the tower can lead to a high temperature at the top of the distillation column, resulting in a higher dry point of the gasoline. 2. Fluctuations in the top pressure of the distillation column: 1) When the top pressure is high, the dry point of gasoline decreases, and the temperature of the extraction stage can be increased appropriately. 2) When the pressure at the top of the tower is low, the dry point of gasoline increases, so the temperature of the extraction layer can be reduced appropriately. 3. The amount of reaction treatment has an impact: 1) When the amount of reaction treatment is large, the dry point of gasoline is low, allowing the temperature of the extraction layer to be increased appropriately. 2) The reaction processing volume is small and the dry point of gasoline is high, so the temperature of the extraction layer can be appropriately reduced. 4. An increase in the reaction intensity, such as raising the reaction temperature or adding a large amount of fresh catalyst, can lead to an elevation in the dry point of gasoline. Although this effect is not very significant during normal production, it is possible to appropriately lower the top temperature during operation
Slightly reduce the top temperature of the tower, slightly reduce the bottom temperature of the tower, slightly increase the top pressure of the tower, and increase the top reflux appropriately
1. Reduce the top temperature of the tower; 2. Reduce the bottom temperature of the tower; 3. Reduce the feed temperature; 4. Enhance co-current dehydration; 5. Increase the operating pressure of the tower;
1. Reduce the top temperature of the tower； 2. Reduce the bottom temperature of the tower ； 3. Reduce the feed temperature ； 4. Strengthen concurrent dehydration ； 5. Increase the operating pressure of the tower ； 6. Appropriately increase the return flow rate.
Adjust the raw materials, increase reflux and reduce outward transfer volume, raise the bottom temperature, and lower the top pressure of the tower
1. Reduce the top temperature of the tower； 2. Reduce the bottom temperature of the tower ； 3. Reduce the feed temperature ； 4. Strengthen concurrent dehydration ； 5. Increase the operating pressure of the tower ； 6. Appropriately increase the return flow rate.
Reduce the top temperature, bottom temperature, and feed temperature; increase pressure and reflux rate
Participate and offer your support. I really don’t understand this. Waiting to learn the *answer :)