【Q&A Question 055】February 24, 2018
Thread Content
【Q&A Question 055】February 24, 2018: What are the factors that shorten the lifespan of hydrogenation catalysts? The reasons that shorten the lifespan of hydrogenation catalysts include: (1) excessively high reactor temperature ； ⑵The dry point of the feed is too high ； ⑶Feed space velocity is too low ； ⑷The purity of the circulating hydrogen gas is too low, resulting in a decrease in hydrogen partial pressure ； ⑸Too low a hydrogen-to-oil ratio, etc. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Due to the limitations on the number of posts in the “One Question per Day” section, “One Image per Day” has been moved to the registered devices section; you can access it through the directory I posted. For management purposes, if you need to access content from a few days ago, please go to the summary post below to enter the “My Registration Season” event – (Note: This event is currently underway in the Chemical Engineering section) https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=18978. Summary post of daily questions for the 2018 Chemical Engineering Technology Training section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888971. Summary post of daily images for the 2018 Registered Equipment section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888970. Summary post of Q&A questions for the 2018 Hydrogen Production and Hydrogenation Technology section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888968. Summary post of daily questions for the 2018 LNG Technology Discussion section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888973. Summary post of Q&A questions for 2017 (updates have started): https://bbs.hcbbs.com/thread-1657793-1-1.html. Summary post of daily questions for 2017 (updates have started): https://bbs.hcbbs.com/thread-1657794-1-1.html. Summary post of daily images for 2017: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1875160. List of daily questions for the 2017 LNG section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1804162. Summary post of Q&A questions for 2016 (updates completed): https://bbs.hcbbs.com/thread-1597792-1-1.html
① The feed dry point is too high. ② The reaction temperature is too high. ③ The purity of the circulating hydrogen is too low, resulting in a decrease in hydrogen partial pressure. ④ The hydrogen-to-oil ratio is too low. ⑤ Feed space velocity is too low
1 Carbon buildup, 2 Toxins, 3 Improper operation
(l) Excessively high reactor temperature; (2) Excessively high dry point of the feed; (3) Too low feed space velocity; (4) Insufficient purity of the recycle gas hydrogen, resulting in a decrease in hydrogen partial pressure; (5) Too low hydrogen-to-oil ratio, etc.
(l) Excessively high reactor temperature; (2) Excessively high dry point of the feed; (3) Too low feed space velocity; (4) Insufficient purity of the recycle gas hydrogen, resulting in a decrease in hydrogen partial pressure; (5) Too low hydrogen-to-oil ratio, etc.
The reactor temperature is too high, the feed dry point is high, the feed space velocity is low, the partial pressure of recycled hydrogen is low, and the hydrogen-to-oil ratio is low
1. The backwashing effect is poor or the flow path is incorrect, resulting in excessive mechanical impurities in the crude oil； 2. Severe water content in the raw material leads to catalyst fragmentation ； 3. The hydrogen-to-oil ratio is too low, resulting in severe coking ； 4. Sudden increases or decreases in temperature and pressure cause the catalyst to break apart ； 5. Excessively high heavy metal content in the feed oil leads to catalyst poisoning and deactivation ； 6. Low sulfur content in the feed oil and low sulfur content in the recycled hydrogen lead to sulfur loss in the catalyst.
(1) Excessively high reaction temperature (2) Excessively high dry point of the feed (3) Too low feed space velocity (4) Insufficient purity of the recycle hydrogen, resulting in a decrease in hydrogen partial pressure (5) Too low hydrogen-to-oil ratio, etc
Coking, heavy metal poisoning, overheating
The reasons that shorten the lifespan of hydrogenation catalysts are: (1) Excessively high reactor temperature； ⑵The dry point of the feed is too high ； ⑶Feed space velocity is too low ； ⑷The purity of the circulating hydrogen gas is too low, resulting in a decrease in hydrogen partial pressure ； ⑸Too low a hydrogen-to-oil ratio, etc.
High bed temperature, high feed dry point, low feed space velocity, low hydrogen-to-oil ratio