How to deal with substandard coker gasoline
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The coker gasoline produced by our factory is generally hydrogenated and then sold as 90-octane gasoline. There is a problem now: the tests conducted by experts do not yield satisfactory results. I would like to ask the experts why this happens – could it be due to issues with the raw materials? What should be done after failing to meet the standards in order to pass? Please give some advice
It can be fed into the desulfurization unit, or a simple oxidation treatment can be used. The University of Petroleum (East China) has developed a new technology to oxidize sulfur in gasoline into sulfoxides.
After hydrogenation of coker gasoline, its octane rating will not reach 90#. . . Have you switched to catalytic gasoline? The doctoral test failed due to excessive sulfur and thiol levels. . . Please improve desulfurization of alcohols or strengthen its operation and management. To address the sulfur content issue this year, it seems everyone will have to go to Fushun or Beijing to use gasoline deep hydrodesulfurization units. . . :lol
Impressive – can gasoline produced from coking gasoline through hydrogenation still be exported as 90-octane gasoline? Can its octane rating reach that level? Generally, purified catalytic gasoline that has undergone secondary processing has a lower octane rating. The main reasons for failure in the doctoral tests are unsatisfactory levels of thiols and hydrogen sulfide. Due to the high olefin content in secondary coker gasoline, and the fact that hydrogenation of coker gasoline generally does not involve cycle hydrogen desulfurization, the hydrogen sulfide level is high; this leads to the formation of thiol sulfur in the product, resulting in failure in the Doctor test.
The failure in the Doctor experiment was due to an excessive level of thiol sulfur; desulfurization treatment was carried out. Even if the thiol sulfur level is within 10PPM and meets the requirements, the experiment may still not pass. Both factors need to be considered, as the effects of large-molecule and small-molecule thiols are different
Check whether the high temperature of the reaction bed is causing hydrogen sulfide to react with hydrocarbons to produce thiols.
Coking gasoline is not suitable for use as finished gasoline; it is better to subject it to hydrogenation and then use it as a chemical light oil for export, as it constitutes an excellent raw material for ethylene production.
It undergoes hydrogenation treatment in the hydrogenation unit, and the market for naphtha is also good