Efficient coupling hydro-upgrading method for producing gasoline with ultra-low sulfur and high octane number

Abstract

The invention relates to an efficient coupling hydro-upgrading method for producing gasoline with ultra-low sulfur and a high octane number. The method comprises the following steps of: distilling inferior full cut gasoline at 50-90 DEG C to obtain light cut gasoline and heavy cut gasoline; making the light cut gasoline contact with a hydrocarbon multi-branched isomerization catalyst; making the heavy cut gasoline contact with a selective hydrogenation desulfurization catalyst and a complement desulfurization isomerization/aromatization catalyst sequentially; and finally, mixing the treated light cut gasoline with the treated heavy cut gasoline to obtain the gasoline with the ultra-low sulfur and the high octane number. The method further comprises the step of: before the distillation, making the inferior full cut gasoline contact with a hydro-selective desulfurization alcohol catalyst, or, before making the light cut gasoline contact with a hydrocarbon multi-branched isomerization catalyst, making the light cut gasoline contact with the hydro-selective desulfurization alcohol catalyst. The efficient coupling hydro-upgrading method is suitable for the hydro-upgrading treatment of inferior gasoline with ultrahigh sulfur and high olefin, reduces the sulfur content after the upgrading treatment to below 5mu g/g (no sulfur substantially) and can maintain the octane number and higher yield of products.

Description

technical field [0001] The invention relates to a production method of ultra-low-sulfur and high-octane gasoline, which belongs to a high-efficiency coupled hydrogenation upgrading method for producing ultra-low-sulfur and high-octane gasoline. Background technique [0002] At present, the high sulfur content and olefin content in FCC gasoline have become the key problems that plague the world's clean gasoline production. In the case of less high-octane reformed gasoline and alkylated gasoline, in order to meet the increasingly stringent clean gasoline standards, FCC gasoline hydro-upgrading has become one of the key technologies for the production of clean fuel for vehicles . [0003] USP 5770047, USP 5417697, etc. introduced the desulfurization and olefin reduction process mainly based on hydrofining-cracking / single-branched hydroisomerization. The main idea of ​​these processes is to cut the whole fraction of FCC gasoline into light and heavy fractions. After the heavy ...

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Problems solved by technology

The olefin content of the product obtained according to this patented method is relatively low, but the sulfur content of the product is difficult to meet the national IV standard of no more than 50 μg·g -1 On the other hand, this method is aimed at high sulfur oil, in order to improve the RON of the final blended product, one of the key points of this patented method is to aromatize the heavy distillate gasoline after hydrodesulfurization, but the aromatics are coke Precursor, higher aromatics generation (product aromatics is higher than raw material more than 10v%) is extremely unfavorable to the stability of catalyst; moreover, the catalyst support in this patent process requires TiO 2 Mainly, this also greatly reduces the strength of the catalyst, which is not conducive to its long-term stable operation and regeneration

[0014] In short, for low-quality oil products such as my country’s FCC gasoline with high sulfur content and high olefins, although many studies have tried to achieve desulfurization and olefin reduction through different means of upgrading, while maintaining and improving the octane number of the oil as much as possible, Although these published methods have their own advantages, it is necessary to explore a more reasonable upgrading process, select a catalyst with appropriate function and activity, achieve ultra-deep desulfurization and greatly reduce olefins while maintaining octane number, and solve the problem of catalyst stability. Problems such as unsatisfactory performance and high processing costs have always been the goals pursued by the field of petroleum refining

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