Catalytic gasoline and diesel solution issues
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It is often heard that the catalytic device can choose between gasoline solution and diesel solution. What will happen to the production conditions when different solutions are selected while the catalyst model remains unchanged? During normal production, what is the relationship between the yield of gasoline and diesel? Please give some advice
The gasoline program produces more gasoline and increases the dry point of gasoline. The diesel program produces more diesel and increases the end boiling point of diesel.
What are the reaction temperatures for catalytic cracking to produce gasoline and diesel? http://bbs.hcbbs.com/viewthread.php?tid=368563&highlight=%B2%F1%D3%CD%B7%BD%B0%B8 How to adjust the operations when carrying out the high-yield gasoline plan, the high-yield diesel plan, and the high-yield liquefied gas plan? http://bbs.hcbbs.com/viewthread.php?tid=358529&highlight=%B2%F1%D3%CD%B7%BD%B0%B8
The diesel solution can lower the reaction temperature, lower the dry point of gasoline, and improve the extraction rate of diesel
The gasoline and diesel program is a program that produces more gasoline or more diesel. When producing more gasoline, try to increase the reaction temperature. However, as the reaction temperature increases, the dry gas will also increase.； Maximize the micro-reaction activity of the balancer ； Increasing the agent-to-oil ratio can produce more gasoline and more diesel. Lowering the reaction temperature, increasing the refining ratio, and reducing the single-pass conversion rate can achieve more diesel production.
The difference between the catalytic gasoline solution/gas solution and the diesel solution is that the target product is different. The final choice of the production technology solution depends on the market and the economic benefits after technical and economic accounting... For example, under the current situation, the market diesel is unsaleable, so the refinery has to follow the market and choose a solution that produces more gasoline and produce as little diesel as possible... Generally, the same device, the same catalyst, and different production solutions; when arranging the plans, the reaction temperature difference between the diesel solution and the diesel solution is about 30-50 degrees Celsius... The ratio of other conditioners to oil is slightly different... The yield is when the gasoline plan is selected, the gasoline yield increases by 3 points, the diesel decreases by 4-5 points, and the gas increases by 1-3 points... Each factory has different raw materials... but this is probably the ratio...:lol This post was last edited by wangsc on 2009-3-3 21:00 ]
With the same device and catalyst, more cracking reactions need to occur when producing more gasoline. The operating conditions are generally harsher, the reaction temperature and the ratio of agent to oil are larger, and as many cracking and isomerization reactions occur as possible. When producing high-yield diesel, the reaction conditions are generally required to be milder, and it is hoped that a moderate amount of cracking reaction will occur and less isomerization reaction will occur, so as to maintain a sufficient cetane number of diesel fuel. So, when considering gasoline options: The operating conditions are higher reaction temperature (about 520°C), small refining ratio, high single-pass conversion rate, increased residence time, and increased agent-to-oil ratio. Consider diesel options: Use milder operating conditions, lower reaction temperature (around 505°C), larger refining ratio, shorter residence time and appropriate agent-to-oil ratio to reduce the occurrence of secondary reactions and increase the yield of the middle distillate.
When using the more gasoline-producing solution, the reaction station should adopt a larger reaction depth and operate under the conditions of high conversion rate, low recycle ratio or single-pass cracking. Specifically, a higher reaction temperature should be used. When operating under the condition of larger catalyst circulation volume, a molecular sieve catalyst with high activity and good selectivity can also be used to produce gasoline, so as to obtain more ideal results.； The dry point of gasoline in the fractionation station is controlled at no more than 205°C. It relies on online operation and the flash point of diesel is controlled above 85°C. Evaporate out as many light components as possible to increase the gasoline yield. At the same time, it is convenient to blend diesel with jet fuel, 200#, etc. without exceeding the flash point. When using the more diesel solution, the reaction station should use a smaller reaction depth and operate under the conditions of low conversion rate and high recycle ratio. Specifically, a lower reaction temperature should be used, the circulation volume should be appropriately reduced, or a low-activity, high-yield diesel catalyst should be selected to achieve better results. ； At the fractionation station, the temperature at the top of the tower is appropriately lowered, the dry point of gasoline is controlled lower, the heavy components in the gasoline are pushed out into the diesel, the temperatures of wax oil distillation and diesel extraction are appropriately increased, part of the recycled oil components are extracted into the diesel, the diesel flow is broadened, and more diesel is produced while maintaining the freezing point.