[Q&A Question 314] 2017.11.28
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【Q&A Question 314】November 28, 2017: What are the disadvantages of too high or too low distillation overhead temperature? The top temperature is the main operating parameter for controlling the dry point of the oil at the tower top. If the top temperature of the tower is too low, it will not be possible to remove all the light components, resulting in an increased load within the tower and unstable operation ； However, an excessively high tower top temperature will result in the gasoline dry point not meeting the specifications. Therefore, excessively high tower top temperatures are inappropriate. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) For management purposes, if you need to view content from a few days ago, please go through the summary post below. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) 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 (Source: Haichuan Chemical Industry Forum)
Components that are too high result in excessive weight, while those that are too low result in insufficient weight
Excessively high temperatures will affect the purity of the product at the top of the tower, resulting in a higher level of heavy components in it； If the temperature is too low, the light components cannot be completely removed at the top of the tower, and they remain in the bottom fractions of the tower.
The top temperature is the main operating parameter for controlling the dry point of the oil at the tower top. If the top temperature of the tower is too low, it will not be possible to remove all the light components, resulting in an increased load within the tower and unstable operation ； However, an excessively high tower top temperature will result in the gasoline dry point not meeting the specifications. Therefore, excessively high tower top temperatures are inappropriate.
Excessively high distillates result in a heavy product with a high dry point. If it is too low, the top of the tower reaches the dew point due to low temperatures; this leads to increased corrosion at the top of the distillation column as a result of the dew point, and the dry point of the product becomes low.
The top temperature is the main operating parameter for controlling the dry point of the oil at the tower top. If the top temperature of the tower is too low, it will not be possible to remove all the light components, resulting in an increased load within the tower and unstable operation ； However, an excessively high tower top temperature will result in the gasoline dry point not meeting the specifications. Therefore, excessively high tower top temperatures are inappropriate.
If the top temperature of the tower is too low, it will not be possible to remove all the light components, resulting in an increased load within the tower and unstable operation； However, an excessively high tower top temperature will result in the gasoline dry point not meeting the specifications.
The top temperature is the main operating parameter for controlling the dry point of the oil at the tower top. If the top temperature of the tower is too low, it will not be possible to remove all the light components, resulting in an increased load within the tower and unstable operation ； However, if the tower top is too high, the dry point of the gasoline will not meet the requirements; therefore, the temperature at the tower top cannot be too high.
The top of tower temperature reflects the changes in the composition of the product at the tower top. The top temperature is too high, resulting in more heavy components. The top temperature is too low, resulting in an excess of light components.
Too high: 1. Low oil yield; 2. High flash point of the product, high dry point of the naphtha. Too low: Low flash point of the product, low dry point of the naphtha