Gasoline hydrodesulfurization method

Abstract

A method using the gasoline hydrogenation to desulfurize is provided, which is carried out in a catalytic distillation column. The catalytic distillation column is divided into a rectification process section, a fractionation section, a stripping reaction section and a stripping section from top from bottom. The preheated raw materials are led into the fractionation section and the hydrogen is led into the bottom of the stripping section; the lighter components fractionated from the fractionation section enter into the section and conduct hydrodesulfurization reaction with the hydrogen under the contact with hydrodesulfurization catalyst A; the discharge on the tower top gains the liquid after cooling and separating; one part of the discharge returns to the rectification process section as the overhead reflux and the other part works as the desulfurized products 1; the heavier components fractionated enter the stripping reaction section and conduct hydrodesulfurization reaction with the hydrogen under the contact with hydrodesulfurization catalyst B and is discharged from the reboiler on the tower bottom after the a stripping section further separates the H2S to work as the desulfurized products 2. The method provided by the invention can obviously improve the rate of the desulfurization of gasoline and have low loss of the octane number of the gasoline.

Description

technical field [0001] The invention relates to a method for hydrodesulfurization of petroleum hydrocarbons. More specifically, it is a method for removing sulfur impurities in gasoline, especially catalytically cracked gasoline, while minimizing the loss of gasoline octane number. Background technique [0002] With the rapid development of the automobile industry, the pollution of automobile exhaust to the environment is becoming more and more serious. The production of low-sulfur, low-olefin, and low-aromatic vehicle fuels has become a common goal pursued by people. Various countries have formulated new vehicle fuel standards one after another. The World Fuel Standard II and III gasoline standards require that the sulfur content in gasoline should be lower than 200ppm and 30ppm respectively. At present, 90-99% of the sulfur content of finished gasoline comes from FCC gasoline; therefore, reducing the sulfur content of FCC gasoline is the key to reducing the sulfur content...

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Problems solved by technology

However, the same catalyst is filled in the whole tower without considering the distribution of olefins and sulfides along the

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