【Q&A Question 147】2018.05.27
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【Q&A Question 147】May 27, 2018: Briefly explain the reasons for the high bromine value of refined diesel How to handle it? Reasons: ① High cost of raw materials, low reaction temperature. ②The reaction pressure is low. ③High airspeed. ④The circulation volume of the circulating oil is low. ⑤The properties of the crude oil have deteriorated. Treatment method: ① Determine the reactor inlet temperature based on the properties of the crude oil. Generally, increasing the reaction temperature can speed up the reaction to meet the requirements regarding bromine value, but the temperature increase should be done gradually. ②If the equipment permits, the reaction pressure can be appropriately increased to enhance the reaction depth. ③Reduce the processing volume and increase the reaction time to meet product quality requirements. ④Increase the load on the circulating oil pump to raise the circulation ratio. ⑤Strengthen communication with the production management department to ensure the stability of the properties of crude oil. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct: 3 wealth, Incorrect: 1 wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below. The APP short-video skills competition has begun! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1951670
Reason: 1. High price of bromine raw material, low reaction temperature； 2. The reaction pressure is too low ； 3. High air velocity ； 4. The circulation volume of the circulating oil is too low ； 5. Deterioration in the properties of the crude oil. Treatment: 1. Increase the reaction temperature to speed up the reaction rate ； 2. Increase the reaction pressure to enhance the reaction depth ； 3. Reduce processing volume and increase reaction time ； 4. Increase the circulation ratio ； 5. Ensure the stability of the raw material properties.
Reasons: ① High cost of raw materials, low reaction temperature. ②The reaction pressure is low. ③High airspeed. ④The circulation volume of the circulating oil is low. ⑤The properties of the crude oil have deteriorated. Treatment method: ① Determine the reactor inlet temperature based on the properties of the crude oil. Generally, increasing the reaction temperature can speed up the reaction to meet the requirements regarding bromine value, but the temperature increase should be done gradually. ②If the equipment permits, the reaction pressure can be appropriately increased to enhance the reaction depth. ③Reduce the processing volume and increase the reaction time to meet product quality requirements. ④Increase the load on the circulating oil pump to raise the circulation ratio. ⑤Strengthen communication with the production management department to ensure the stability of the properties of crude oil.
Reasons: ① High price of bromine raw material, low reaction temperature. ②The reaction pressure is low. ③High airspeed. ④The circulation volume of the circulating oil is low. ⑤The properties of the crude oil have deteriorated. Treatment method: ① Determine the reactor inlet temperature based on the properties of the crude oil. Generally, increasing the reaction temperature can speed up the reaction rate in order to meet the requirements regarding bromine value, but the temperature increase should be done gradually. ②If the equipment permits, the reaction pressure can be appropriately increased to enhance the reaction depth. ③Reduce the processing volume and increase the reaction time to meet product quality requirements. ④Increase the load on the circulating oil pump to raise the circulation ratio. ⑤Strengthen communication with the production management department to ensure the stability of the properties of crude oil.
Low volume of circulating hydrogen, low reaction temperature, low reaction pressure
Reasons: ① High cost of raw materials, low reaction temperature. ②The reaction pressure is low. ③High airspeed. ④The circulation volume of the circulating oil is low. ⑤The properties of the crude oil have deteriorated. Treatment method: ① Determine the reactor inlet temperature based on the properties of the crude oil. Generally, increasing the reaction temperature can speed up the reaction in order to meet the requirements regarding bromine value, but the temperature increase should be done gradually. ② If the equipment permits, the reaction pressure can be appropriately increased to enhance the reaction depth. ③Reduce the processing volume and increase the reaction time to meet product quality requirements. ④Increase the load on the circulating oil pump to raise the circulation ratio. ⑤Strengthen communication with the production management department to ensure stability in the properties of crude oil
The hydrogenation reaction occurs at a low temperature, with little hydrogen mixing, resulting in catalyst carbon deposition.
Reason: 1. High price of bromine raw material, low reaction temperature； 2. The reaction pressure is too low ； 3. High air velocity ； 4. The circulation volume of the circulating oil is too low ； 5. Deterioration in the properties of the crude oil. Treatment: 1. Increase the reaction temperature to speed up the reaction rate ； 2. Increase the reaction pressure to enhance the reaction depth ； 3. Reduce processing volume and increase reaction time ； 4. Increase the circulation ratio ； 5. Ensure the stability of the raw material properties.
A high bromine value indicates a high content of unsaturated hydrocarbons. The reasons for this are: a high content of olefins in the feed, a low hydrogen-to-oil ratio, shallow hydroprocessing depth, large feed rates, high space velocity, low reaction temperature, low pressure, and reduced catalyst activity. Treatment: First, increase the reaction temperature and raise the reaction pressure within the specified range. If there is no improvement, contact the higher-level authorities to replace the raw materials, reduce the processing load, and increase the hydrogen-to-oil ratio. If none of these measures yield improvement, consider shutting down the operation to replace the catalyst
The crude oil contains a high level of olefins, the catalyst’s performance is poor, and the hydrogen partial pressure increases
Low reaction temperature, low reaction pressure, excessive space velocity