[Q&A Question 091] 2016.07.20
Thread Content
【Q&A Question 091】July 20, 2016: What are the reasons for the high sulfur content in refined diesel? The answer key will be available after responding; scoring is based on answering the key points. The reaction depth is insufficient.
1. Insufficient reaction depth； 2. Internal leakage in the heat exchanger for reaction feed and discharge ； 3. Improper operation of the distillation tower: low bottom temperature and excessive reflux rate ； 4. Errors in laboratory analysis
High sulfur content in the feedstock, improper control of catalyst ratio, low circulation ratio, high space velocity, large operational fluctuations, and decreased catalyst activity
The reaction depth is insufficient, resulting in poor separation
Reasons: Insufficient reaction depth, excessive sulfur content in raw materials, etc
Reaction temperature. Reaction pressure. Sulfur content of the raw material. Purity of recycled hydrogen. Is there any leakage in the high-pressure heat exchanger?
What are the reasons for the high sulfur content in refined diesel? High sulfur content in the feed diesel, low catalyst activity, low reaction temperature, and low amount of water used in hydrogenation
The amount of fresh hydrogen in the diesel hydrogenation reactor is too low
The stripping efficiency of the hydrogen sulfide removal stripper deteriorates, and the degree of reaction is insufficient; it depends on the type of sulfur – whether it is inorganic or organic – to determine this
1. The reaction temperature is low. 2. The reaction pressure is low. 3. The sulfur content of the crude oil is high. 4. The catalyst has low activity. 5. Fluctuations in distillation operations. 6. High internal leakage at the seal.