Catalytic selective hydrogenation of gasoline
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Our company uses the FDFCC process for catalytic conversion at a capacity of 1.2 million tons per year; the sulfur content in the catalytic gasoline is around 800 ppm, with 20% olefins. For gasoline hydrogenation, we employ UOP catalysts of types 120 and 250. This process enables hydrogenation of the entire fraction of gasoline, as well as of middle-grade and heavy-grade gasoline. The sulfur content in the resulting products is below 50 ppm, while the octane rating decreases by 0.4 to 0.6 units. The temperature in the reactor is maintained at 150 degrees Celsius, while that in the hydrogenation reactor is 250 degrees Celsius.
Could you provide detailed information on UOP’s technical data regarding the full-range hydrogenation of catalytic gasoline, with only a 0.6-unit loss in octane number? Are isomerization or etherification reactions taking place?
There should be etherification or octane recovery reactors; the full-range hydrogenation process mentioned by the original poster involves pre-hydrogenation followed by fractionation, after which mid- and heavy fractions are hydrogenated, and finally the three fractions are mixed to produce low-sulfur products.
100% of the catalytic gasoline enters the protection bed reactor, where it is heated to 250 degrees Celsius in a heater before going into the desulfurization reactor. There is no octane number recovery reactor, but the desulfurization catalyst has isomerization and aromatization functions.
What are the investment and operation costs? This is similar to the catalyst developed by Dalian University of Technology, but the catalyst from that university is primarily used for high-selectivity hydrodesulfurization, with almost no aromatization or isomerization reactions occurring
Some facilities use catalytic fractionation towers for gasoline hydrogenation; what is done with the catalysts inside them when they come online?
At 250 degrees, there is virtually no aromatization reaction; it occurs around 350 degrees.
Our company’s 1.2 million tons per year of catalytic gasoline is produced using technology from the American company CD-TECH, and it is operating very well~
Which petrochemical company do you work for? The process of using catalytic distillation for olefin reduction and desulfurization is not very commonly used in China, right?
Wouldn’t it be better to first separate gasoline into light gasoline, and then subject that light gasoline to hydrogenation? What is the purpose of the protection reactor? Is it to reduce the diene content?
I work at Guangxi Petrochemical; our plants use only nickel-based catalysts, not palladium-based ones, to convert thiol compounds in light gasoline into sulfides which are then included in middle-grade gasoline. The content of olefins does not decrease much as a result