The Doctor test for hydrogenated gasoline failed
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The catalytic gasoline produced by the gasoline hydrogenation unit undergoes hydrogenation first in a pre-hydrogenation reactor upon entering the unit; it is then sent to a pre-distillation tower where it is separated into light gasoline and heavy gasoline. The heavy gasoline goes into another distillation tower to be divided into medium gasoline and the heaviest fraction of gasoline. The medium gasoline is desulfurized using extraction methods, while the heaviest fraction is subjected to hydrogenation and desulfurization in a hydrogenation reactor. After desulfurization, the heavy gasoline, medium gasoline, and light gasoline are mixed together and sent to an alkaline wash column for further desulfurization before being shipped out. However, the gasoline sent out has not passed the Doctor tests in recent days due to the presence of contaminants; previously, these tests were successful, and when they failed occasionally, it was possible to get them to pass by changing the type of alkali used. The gasoline produced meets National V standards. Is there anyone who knows the reason? I would appreciate your advice.
Test the thiol content in light gasoline, medium gasoline, and heavy gasoline separately, as well as conduct further experiments, to determine which process or processes are causing the problem, so that appropriate solutions can be found
There must be a problem with the alkali wash desulfurization tower. Normally, even if the product is not up to standard, it should still meet the requirements after going through the alkali wash desulfurization process; let’s investigate the issues in this area
It’s likely a problem with the reaction process; perhaps the reaction temperature is too low, which has led to a decrease in the hydrogen-to-oil ratio. The reaction temperature can be increased slightly, as well as the hydrogen-to-oil ratio
There are problems with the alkali wash desulfurization alcohol tower; has the alkali solution changed, and are there any issues with the fixed-bed reactor?
Is the problem solved now? Just send the mixed gasoline through the gasoline desulfurization unit again