Desulfurization process of gasoline

Abstract

A process for desulfurizing gasoline includes such steps as reaction between thiol and diolefin in gasoline in fixed-bed reactor to generate S-contained compound with higher boiling point, separatingout low-sulfure light fraction from the gasoline in distilling tower, hydrodesulfurizing or selective hydrodesulfurizing in catalytic distilling tower to convert said S-contained compound and other sulfide to hydrogen sulfide, discharging the hydrogen sulfide, residual hydrogen and part of gasoline fraction from the tower top, and discharging the heavy components of gasoline from tower still. Itsadvantages are less consumption of hydrogen and high output rate of liquid.

Description

technical field [0001] The invention relates to a gasoline desulfurization process, in particular to a process for removing sulfur compounds in catalytic cracking gasoline, which can remove the sulfur compounds in gasoline and at the same time reduce the loss of gasoline octane number to the greatest extent. Background technique [0002] With the continuous enhancement of people's awareness of environmental protection, the pollution caused by automobile exhaust has become the focus of people's attention. The use of automobile exhaust catalytic converters is the best way to reduce automobile exhaust pollutant emissions, but high-performance exhaust catalytic converters require high-quality fuel oil, especially the sulfur content in gasoline has a significant impact on the performance of exhaust catalytic converters Impact. For this reason, the United States, Europe, Canada, etc. put forward the requirement to reduce the sulfur content in gasoline to 30-150 μg / g. [0003] Ac...

AI Technical Summary

Problems solved by technology

But its disadvantage is that the H produced by selective hydrodesulfurization 2 S will further react with olefins to form mercaptans, and the mercaptan content in the product is generally 15-30 μg / g, which requires further sweetening

[0008] The catalytic distillation desulfurization process disclosed in CN1189183A puts all naphtha, kerosene, and diesel oil into a catalytic distillation tower, so that light gasoline fractions with high olefin content and low sulfur content also contact the hydrodesulfurization catalyst, which increases the hydrogenation saturation of this part of olefins. chance, will result in a larger octane loss

The catalyst loading of two catalytic distillation towers is cumbersome, because the void ratio of the catalytic distillation tower catalyst loading area is smaller than that of ordinary distillation towers, that is, the operating flexibility is small, and the processing capacity or desulfurization rate and octane number loss of the two towers cannot be flexibly adjusted.

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