【Daily Question No. 359】December 31, 2018
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【Daily Question No. 359】December 31, 2018: Briefly describe the precautions that should be taken when using hydrogenation refining catalysts There is no fixed answer; any reasonable response will do. ①Prevent the vulcanized catalyst from coming into contact with air, as exposure to air can lead to ignition or oxidative deactivation ； ②Avoid extensive contact between toxic substances and catalysts ； ③Prevent the catalyst bed from overheating, which could lead to melting of the catalyst surface, coking of the feed oil, carbon deposition on the catalyst surface, and a decrease in its activity ； ④Maintain an appropriate hydrogen-to-oil ratio to prevent coking of the feed oil ； ⑤The heating and cooling processes should be carried out slowly to prevent the catalyst from breaking apart ； ⑥Before using the catalyst, a quality inspection must be carried out (check for certification, instructions for use, signs of moisture or contamination; determine whether dust and powder removal is necessary based on the degree of damage). (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
①Prevent the vulcanized catalyst from coming into contact with air, as exposure to air can lead to ignition or oxidative deactivation； ②Avoid extensive contact between toxic substances and catalysts ； ③Prevent the catalyst bed from overheating, which could lead to melting of the catalyst surface, coking of the feed oil, carbon deposition on the catalyst surface, and a decrease in its activity ； ④Maintain an appropriate hydrogen-to-oil ratio to prevent coking of the feed oil ； ⑤The heating and cooling processes should be carried out slowly to prevent the catalyst from breaking apart ； ⑥Before using the catalyst, a quality inspection must be carried out (check for certificates of conformity, usage instructions, as well as whether it is damp or contaminated; determine whether dust and powder removal is necessary based on the degree of damage)
①Prevent the vulcanized catalyst from coming into contact with air, as exposure to air can lead to ignition or oxidative deactivation； ②Avoid extensive contact between toxic substances and catalysts ； ③Prevent the catalyst bed from overheating, which could lead to melting of the catalyst surface, coking of the feed oil, carbon deposition on the catalyst surface, and a decrease in its activity ； ④Maintain an appropriate hydrogen-to-oil ratio to prevent coking of the feed oil ； ⑤The heating and cooling processes should be carried out slowly to prevent the catalyst from breaking apart ； ⑥Before using the catalyst, a quality check must be conducted on it (check for certification and instructions for use, determine whether it is damp or contaminated, and decide whether dust and powder removal is necessary based on the degree of damage) ； ⑦The reactor must be dried before loading the material ； ⑧Ensure proper loading of the catalyst.
①Prevent the vulcanized catalyst from coming into contact with air, as exposure to air can lead to ignition or oxidative deactivation； ②Avoid extensive contact between toxic substances and catalysts ； ③Prevent the catalyst bed from overheating, which could lead to melting of the catalyst surface, coking of the feed oil, carbon deposition on the catalyst surface, and a decrease in its activity ； ④Maintain an appropriate hydrogen-to-oil ratio to prevent coking of the feed oil ； ⑤The heating and cooling processes should be carried out slowly to prevent the catalyst from breaking apart ；
①Prevent the vulcanized catalyst from coming into contact with air, as exposure to air can lead to ignition or oxidative deactivation； ②Avoid extensive contact between toxic substances and catalysts ； ③Prevent the catalyst bed from overheating, which could lead to melting of the catalyst surface, coking of the feed oil, carbon deposition on the catalyst surface, and a decrease in its activity ； ④Maintain an appropriate hydrogen-to-oil ratio to prevent coking of the feed oil ； ⑤The heating and cooling processes should be carried out slowly to prevent the catalyst from breaking apart ； ⑥Before using the catalyst, a quality inspection must be carried out (check for certificates of conformity, usage instructions, as well as whether it is damp or contaminated; determine whether dust and powder removal is necessary based on the degree of damage) ； ⑦The reactor must be dried before loading the material ； ⑧Ensure proper loading of the catalyst.
①Prevent the vulcanized catalyst from coming into contact with air, as exposure to air can lead to ignition or oxidative deactivation； ②Avoid extensive contact between toxic substances and catalysts ； ③Prevent the catalyst bed from overheating, which could lead to melting of the catalyst surface, coking of the feed oil, carbon deposition on the catalyst surface, and a decrease in its activity ； ④Maintain an appropriate hydrogen-to-oil ratio to prevent coking of the feed oil ； ⑤The heating and cooling processes should be carried out slowly to prevent the catalyst from breaking apart ； ⑥Before using the catalyst, a quality inspection must be carried out (check for certificates of conformity, usage instructions, as well as whether it is damp or contaminated; determine whether dust and powder removal is necessary based on the degree of damage) ； ⑦The reactor must be dried before loading the material ； ⑧Ensure proper loading of the catalyst.
The two catalyst beds in the hydrorefining reactor are connected by four discharge pipes, each with a diameter of only 400 mm. If coking occurs and these pipes become blocked, it will prevent the catalyst in one of the beds from being removed. Therefore, when starting to remove the catalyst from the hydrorefining reactor, it is necessary to monitor whether the level of material in one of the beds decreases; if there is no decrease, it indicates that the discharge pipe is blocked, and removal should be stopped. The catalyst in that bed must first be removed from the reactor before attempting to remove the catalyst from the other bed.
Prevent the vulcanized catalyst from coming into contact with air, as exposure to air can lead to ignition or oxidative deactivation； Avoid extensive contact between toxic substances and catalysts ； Prevent the catalyst bed from overheating, which could lead to melting of the catalyst surface, coking of the feed oil, carbon deposition on the catalyst surface, and a decrease in its activity ； Maintain an appropriate hydrogen-to-oil ratio to prevent coking of the feed oil ； The heating and cooling processes should be carried out slowly to prevent the catalyst from breaking apart ； Before using the catalyst, a quality inspection must be carried out (check for certificates of conformity, usage instructions, as well as whether it is damp or contaminated; determine whether dust and powder removal is necessary based on the degree of damage) ； The reactor must be dried before loading the material ； Ensure proper loading of the catalyst.
. ①Prevent the vulcanized catalyst from coming into contact with air; if it does come into contact with air
1. During loading, try to use dense-phase loading to ensure the uniformity, compactness, and proper gradation of the catalyst in the bed； 2. During drying, the temperature must be strictly controlled in accordance with the heating curve; it is advisable to use a medium with a high flow rate and low pressure for heat transfer, as well as to minimize water content ； 3. During pre-vulcanization, operate strictly in accordance with the vulcanization plan; the temperature rise of the bed layer and the hydrogen sulfide concentration in the system are the control targets, while the sulfur injection rate and temperature increase rate are the control methods, to ensure optimal vulcanization results ； 4. After vulcanization, it is essential to select the appropriate feedstock to achieve initial activity stabilization ； 5. During the production process, operations must be carried out strictly in accordance with the procedural guidelines; temperature changes should be gradual, the rate of change should be moderate, and temperatures as well as pressures must not be exceeded. Burn off carbon deposits promptly ；