What are the possible reasons for the increase in gum content in gasoline from catalytic cracking units, and what are the effective solutions?
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Please help come up with some solutions. The gasoline gum content in this device has been increasing too rapidly recently. I’m not sure what the possible causes might be, nor what effective ways to address this issue exist help me:'( ......
When the diene content in gasoline is high, gum formation is likely to occur. Reaction temperature, raw material properties, and catalyst all affect the formation of dienes. Provide a detailed explanation of the differences from previous operations.
In addition to the effects of raw materials and reaction conditions, the gasoline additives added also have an impact
Solve it from three aspects: 1. Increase catalyst activity and reduce thermal cracking reactions. 2. Reduce the outlet temperature of the raw material heating furnace; have the laboratory measure the viscosity at 150 degrees, and then conduct measurements every 10 degrees increase to find an appropriate outlet temperature for the furnace. 3. Lower the temperature of the regenerated catalyst and increase the catalyst-to-oil ratio.
The gum content in the catalytic gasoline at our facility has also been very high recently; it’s extremely difficult to settle the sediment within the tanks. Numerous impurities are detected during gum analysis – I’m not sure what causes them
Adding antioxidant anti-gelling agents should be able to address your problems, but it only provides a temporary solution; to solve the issue fundamentally, it is necessary to examine any changes in the raw materials and operating conditions
When the properties of the raw materials change, the approach must also change! Previously, most of the catalytic feedstocks were atmospheric pressure paraffinic oils, so there was naturally less gum ； Currently, most refineries blend coker wax oil into their products. Due to the high sulfur and nitrogen contents in coker wax oil, especially the alkaline nitrogen content (greater than 1600 ppm), this leads to the deactivation of CAT catalysts. As a result, more thermal cracking reactions occur within the plants, the levels of olefins and dienes increase, and the amount of gum also increases. The solution is hydrodenitration of paraffin oil.
I agree; it can be said that the formation of gums is closely related to thermal cracking. It might be necessary to increase the catalyst activity or raise the oil-to-catalyst ratio to see if that helps