The gasoline has a high content of olefins; how can this be adjusted?
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Dear seniors: The gasoline contains a high level of olefins, around 52. How should this be adjusted? Our crude oil has a heavy composition, and it’s made up of various mixed varieties. Do you have any good suggestions? Thank you
Both the FDFCC process and the AIP process can reduce the olefin content in gasoline.
This post was last edited by lilei8610 on 2012-6-7 at 19:39. Utilizing MIP technology, it is divided into two reaction zones; the first reaction zone is primarily used for primary cracking, breaking down heavier feed oils to produce a large amount of olefins. After a short residence time, the mixture moves on to the lower part of the second reaction zone, which has an expanded diameter； The second reaction zone employs measures such as diameter expansion and the injection of cooling media to reduce the flow rates of oil and gas as well as the catalyst, and to lower the temperature in this zone. This helps to suppress secondary cracking reactions, promote hydrogen transfer, isomerization, and aromatization reactions, thereby increasing the content of isoparaffins and aromatics in the catalyzed gasoline while reducing the olefin content.
If it is possible to modify the device to the MIP format or FDFCC format. If only old units are available, an olefin reduction catalyst can be used to reprocess crude gasoline appropriately.
The level of olefins is too high; if no modifications are made, the problem can only be addressed by working on the catalysts!
This post was last edited by liurf1975 on 2012-6-8 08:26. The content of catalytically stabilized olefins can be reduced by considering the following aspects: 1. Improve catalyst activity to reduce thermal cracking reactions； 2. Lowering the reaction temperature is beneficial for the hydrogen transfer reaction ； 3. Increase the agent-to-oil ratio ； 4. Extend the reaction time or install an MIP section in the riser to facilitate the hydrogen transfer reaction ； 5. Increase the temperatures at the bottom and top of the stabilizer to reduce the amount of gas in gasoline, thereby lowering the content of butylene ； 6. Use an olefin reduction catalyst.
An MIP modification must be carried out; it is the ultimate solution for reducing gasoline olefins and minimizing octane loss. Otherwise, it is difficult to reduce gasoline olefins from 52% to 30%; even if the requirement is met, the losses will be significant.
Hydrogenation should be a good method; it’s rare these days to find gasoline obtained from heavy oil catalytic cracking that can be used directly as gasoline
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