【Q&A Question 307】November 21, 2017
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【Q&A Question 307】November 21, 2017: What are the methods to address the issue of an unsatisfactory flash point in refined diesel? Answer: (1) Increase the feed temperature to the distillation column; (2) Increase the bottom temperature of the column; (3) Increase the amount of steam used for stripping at the bottom of the column; (4) Increase the top temperature of the column. (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)
1 Increase the feed temperature of the distillation column. 2 Increase the bottom temperature of the column. 3 Increase the amount of steam used for stripping at the bottom of the column. 4 Increase the top temperature of the column
Increase the top temperature of the tower and reduce the tower pressure
(1) Reduce C-201 pressure； (2) Increase the outlet temperature of F-201 ； (3) Increase the top temperature of the tower ； (4) Slightly increase the backflow rate at C-202 ； (5) Increase the C-202 feed temperature
Extract the light components and use diesel steam for stripping
There are many reasons why lightning may not function properly: 1. Excessively high or low liquid level; 2. Excessively high or low reboiling temperature; 3. Excessively high or low tower pressure; 4. Changes in the composition of the feed; 5. Changes in the feed temperature. Solutions: 1. Control the liquid level to minimize fluctuations; 2. Maintain stable tower pressure; 3. Adjust parameters promptly based on changes in the feed composition; 4. Control the reboiler temperature properly; 5. Control the feed temperature properly
(1) Increase the feed temperature of the distillation column; (2) Increase the bottom temperature of the column； (3) Increase the steam volume for bottom stripping; (4) Raise the top temperature of the tower ；
1 Increase the feed temperature of the distillation column. 2 Increase the bottom temperature of the column. 3 Increase the amount of steam used for stripping at the bottom of the column. 4 Increase the top temperature of the column