关键词: 催化反应, 选择性, 汽油, 柴油, 芳烃

Abstract: The study on selective catalytic cracking of light diesel fraction to high octane naphtha was conducted in laboratory on a fixed fluidized bed reactor under the conditions of a catalyst-to-oil mass ratio of 6, a weight hourly space velocity of 10 h-1 and a reaction temperature range of 450℃~620℃. Test results show that with the increase of reaction temperature, the naphtha yield increases firstly, and then decreases. The aromatic content of naphtha is over 60%, and most of them are C8-C9 aromatic hydrocarbons, esp. aromatics having multi-methyl side chains. With the increase of per 10℃ of reaction temperature, the benzene content of naphtha increases 0.12 percentages. The ideal catalytic conversion pattern of light diesel fraction is cracking the alkyl side-chains of aromatic hydrocarbons mainly and suppressing dehydrocyclization and condensation reactions to take place in some extent, which could be realized by optimizing the reaction conditions and adjusting the active sites of catalytic materials.

Key words: catalytic reaction, selective, gasoline, diesel fuel, aromatic hydrocarbon