A method for supergravity diesel oil and gasoline hydrotreating

Abstract

The invention discloses a method for hydrofining of super-gravity diesel oil and gasoline. The method comprises the following steps: selecting a first-level super-gravity reactor and a second-level super-gravity reactor which are serially connected with each other; inputting hydrogen and raw oil into a feeding chamber for efficiently mixing gas-liquid two phases, dispersing the insoluble hydrogen in the raw oil into abundant nano-micron gas bubbles and achieving the super-saturated state of the hydrogen in the raw oil, thereby forming a gas-liquid mixture; conveying the gas-liquid mixture into a rotor containing a catalyst through a liquid distributor and performing hydrogen desulfurization denitrification reaction, thereby acquiring the raw oil without sulfur and nitrogen containing impurities; inputting the hydrogen and the raw oil without sulfur and nitrogen containing impurities into the second-level super-gravity reactor for performing unsaturated hydrocarbon hydrogenation reaction. Through the reaction according to the invention, the solubility of the insoluble hydrogen in the liquid phase is super-saturated, the reductive hydrogen is efficiently utilized and the gas-liquid-solid phase mass transfer is enhanced; the desulfurization rate of the raw oil according to the method is more than or equal to 90% and the denitrification rate is more than or equal to 80%; compared with the present super-gravity technique, the method has the advantage that the conversion rate of unsaturated hydrocarbon is increased by 15%.

Description

technical field [0001] The invention belongs to the field of hydrofinishing of feedstock oil, in particular to a method for hydrofining of supergravity diesel oil and gasoline. Background technique [0002] With the increasingly stringent environmental protection regulations, diesel and gasoline with low sulfur, low aromatics and high cetane number have become the development trend of new specifications for diesel and gasoline in developed countries and regions in the world. EU countries have implemented the Euro V emission standard since 2009, which reduces the sulfur content of diesel to below 10 μg / g. Developed countries such as the United States and Japan have also promulgated their own diesel standards, respectively reducing the sulfur content standards to below 15μg / g and 10μg / g. From January 1, 2017, my country has implemented the National V emission standard across the country. [0003] At present, the traditional trickle bed hydrogenation technology is mature and ...

AI Technical Summary

Problems solved by technology

[0008] In recent years, the application research of high-gravity technology in the field of chemical engineering has made many important progress. CN103102942A successfully passed the raw oil into the high-gravity reactor equipped with non-precious metal catalyst, and contacted with hydrogen countercurrently to desulfurize, denitrogenate and saturate some aromatics. reaction, but adopt the mode of packing catalyst, the operation process is difficult, the pressure drop in the reaction process is relatively large, and the catalyst is easily deactivated; CN104419454A fixes the metal-polymer catalyst on the rotor of the high-gravity rotary bed reactor, and pyrolysis gasoline and hydrogen pass through The rotating catalyst bed carries out the selective hydrogenation reaction, but the raw material ratio and fixing method of the monolithic catalyst fixing process are not specifically proposed

Moreover, in the existing high-gravity technology, the hydrogenation efficiency of diesel and gasoline is low due to the solubility of hydrogen, and the cost of hydrogenation is relatively high.

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