【Q&A Question 156】2018.06.05
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【Q&A Question 156】June 5, 2018: Briefly describe the issues that need to be considered when using catalysts in hydrogenation units. ① Prevent the catalysts that have been reduced or sulfided from coming into contact with air； ②Avoid extensive contact between catalytic poisons and the catalyst ； ③Preventing overheating of the catalyst bed D: Maintaining appropriate operating conditions, among which the hydrogen-to-oil ratio is a key factor ； ④Maintaining a slow rate of temperature and pressure increase; sudden rises and falls in the catalyst bed temperature can cause the catalyst to break down. (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
①Prevent the reduced or vulcanized catalyst from coming into contact with air； ②Avoid extensive contact between catalytic poisons and the catalyst ； ③Preventing overheating of the catalyst bed D: Maintaining appropriate operating conditions, among which the hydrogen-to-oil ratio is a key factor ； ④Maintaining a slow rate of temperature and pressure increase; sudden rises and falls in the catalyst bed temperature can cause the catalyst to break down.
1. During loading: Ensure even loading, proper grading, and prefer dense-phase loading whenever possible. 2. During drying: Use low pressure and high temperature, with sufficient holding time to ensure thorough dehydration. 3. During vulcanization: Follow the requirements strictly to guarantee the quality of vulcanization, including the degree of sulfur incorporation. 4. During operation: Use appropriate process parameters, and opt for lower operating conditions whenever possible. 5. In case of failures: Handle them properly to prevent the bed layer from overheating. 6. Do not allow reverse pressure release. 7. Analyze the raw materials regularly to ensure that impurities are within acceptable levels. 8. Burn off carbon deposits promptly when they become severe
a. Prevent the reduced or vulcanized catalyst from coming into contact with air； b. Avoid extensive contact between catalytic poisons and the catalyst ； c. Prevent the catalyst bed from overheating ； d. Maintain a slow rate of temperature and pressure increase; sharp fluctuations in the temperature of the catalyst bed can cause the catalyst to break down.
Answer: ① To prevent the reduced or vulcanized catalyst from coming into contact with air； ②Avoid extensive contact between catalytic poisons and the catalyst ； ③Preventing overheating of the catalyst bed D: Maintaining appropriate operating conditions, among which the hydrogen-to-oil ratio is a key factor ； ④Maintaining a slow rate of temperature and pressure increase; sudden rises and falls in the catalyst bed temperature can cause the catalyst to break down.
Temperature, hydrogen-to-oil ratio, space velocity, pressure
①Prevent the vulcanized catalyst from coming into contact with air, as contact with 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 reduced or vulcanized catalyst from coming into contact with air； ②Avoid extensive contact between catalytic poisons and the catalyst ； ③Preventing overheating of the catalyst bed D: Maintaining appropriate operating conditions, among which the hydrogen-to-oil ratio is a key factor ； ④Maintaining a slow rate of temperature and pressure increase; sudden rises and falls in the catalyst bed temperature can cause the catalyst to break down.
①Prevent the reduced or vulcanized catalyst from coming into contact with air； ②Avoid extensive contact between catalytic poisons and the catalyst ； ③Preventing overheating of the catalyst bed D: Maintaining appropriate operating conditions, among which the hydrogen-to-oil ratio is a key factor ； ④Maintaining a slow rate of temperature and pressure increase; sudden rises and falls in the catalyst bed temperature can cause the catalyst to break down.
①Prevent the reduced or vulcanized catalyst from coming into contact with air； ②Avoid extensive contact between catalytic poisons and the catalyst ； ③Preventing overheating of the catalyst bed D: Maintaining appropriate operating conditions, among which the hydrogen-to-oil ratio is a key factor ； ④Maintaining a slow rate of temperature and pressure increase; sudden rises and falls in the catalyst bed temperature can cause the catalyst to break down.