Any questions about hydrodesulfurization (catalytic dewaxing, catalytic hydrogenation)? Thiol sulfur content, catalyst loading, operational lag time

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The last edit to this post was made by 328104062 on 2017-6-15 at 21:51. As the title suggests: Hydrogenation unit (with dewaxing and pour point reduction functions). 1. What is the relationship between the thiol sulfur content and the supplementary refining agent (post-refining agent), and what determines the amount of this post-supplementary refining agent to be used? Why do olefins and hydrogen sulfide combine to form thiol sulfur at the bottom of the reactor? Although I know this is a reversible reaction, isn’t RSH the one that is not easiest to remove? 240 degrees is sufficient; then how can sulfur thiols be reformed at temperatures above 300°C? Where are the control steps? Hydrogen sulfide concentration? Hydrogen sulfide, as a blocker, inhibited hydrogenolysis? 2. Loading of the dewaxing (dew point reduction) catalyst: The dew point reduction catalyst contains selective molecular sieve ZSM-5; it is essentially a cracking agent that undergoes an endothermic reaction. As the temperature of the bed decreases, the reaction rate **decreases**, whereas the hydrogenation agent is exothermic. So how can hierarchical loading be used to maintain the activity of the cracking agent? Catalyst + hydrogenation agent + catalyst + hydrogenation agent? 3. Space velocity: Please check what the space velocity of the refining agents is in everyone’s diesel hydrogenation units Format: Sulfur content: 700 ppm; High-pressure value: 4.0 MPa; Space velocity of the refining agent: 4.0; Temperature: 360. Removal is very difficult, and it is hard to meet the National V standards completely. 4. What is the operating lag time for the diesel dewaxing (anti-settling) unit? For example, if the temperature of the antifreeze is increased, how long will it take to achieve a significant reduction in the freezing point – 48 hours? Manager Discussion Group