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Method for producing low-sulfur gasoline

A gasoline and heavy gasoline technology, which is applied in the field of gasoline hydrodesulfurization, can solve the problems of reducing the total sulfur of the product and cannot be removed, and achieves the effect of low octane number loss and avoiding hydrogenation loss.

Active Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The mercaptans in the heavy fraction of gasoline after hydrogenation are mainly macromolecular mercaptans, which are stable in nature. The traditional oxidative extraction sweetening method cannot remove these macromolecular mercaptans, but can only convert mercaptans into disulfides to reduce sulfur Alcohol sulfur content, but the total sulfur of the product did not decrease

Method used

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  • Method for producing low-sulfur gasoline
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  • Method for producing low-sulfur gasoline

Examples

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Embodiment 1

[0043] The process of gasoline fractionation and heavy fraction hydrodesulfurization is the same as that of Comparative Example 1. The difference is that the heavy gasoline fraction after hydrodesulfurization is introduced into the stripper. The stripping tower has a diameter of 32mm, a height of 4m, and a height of 1m above the feed, filled with Φ3mm metal rolling hole random packing. A total of 140g of sweetening catalyst RSS-1A is loaded below the feed inlet, the operating pressure of the stripper is 1.3MPa, the average temperature of the catalyst bed is 220°C, the feed rate is 700g / h, and the feed hydrogen-oil ratio is 25. Part of the product returns to the stripper after being heated by the reboiler, and part of the product is discharged with a discharge rate of 500g / h. The discharge from the top of the tower is condensed and then the non-condensable gas is discharged, and the liquid phase product is partially refluxed and partially discharged, with a reflux ratio of 0.5...

Embodiment 2

[0048]The processes of gasoline fractionation and heavy gasoline fraction hydrodesulfurization are the same as in Example 1. The heavy gasoline fraction after hydrodesulfurization is introduced into a stripper for hydrodemercaptanization, and the stripper and catalyst loading used are the same as in Example 1. The difference is that the operating pressure of the stripper is 0.9MPa, the average temperature of the catalyst bed below the feed is 200°C, the feed rate is 700g / h, the hydrogen-oil ratio of the feed is 10, and the output at the top and bottom of the tower is 400g / h. The discharge from the top of the tower is condensed and then the non-condensable gas is discharged, and the liquid phase product is partially refluxed and partially discharged, with a reflux ratio of 0.2. The top discharge is further stripped to remove the H 2 S is then mixed with sweetened heavy gasoline fraction products to obtain sweetened heavy gasoline fractions, the properties of which are shown in...

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Abstract

The invention relates to a method for producing low-sulfur gasoline, which comprises the following steps that: firstly, gasoline raw materials are fractionated into light and heavy gasoline fractions, the light gasoline fractions are subjected to alkali washing for removing sulfur and alcohol, the heavy gasoline fractions are subjected to catalytic hydrogenation for removing sulfur-containing compounds, the heavy gasoline fractions after the hydrogenation desulfuration are introduced into a counter flow reactor from the middle part, hydrogenation sulfur and alcohol removal catalysts are filled in positions under a material inlet of the counter flow reactor, hydrogen-rich gas is introduced from the bottom of the reactor, a part of heavy gasoline fractions are vaporized into gas phase ingredients and liquid phase ingredients, the liquid phase ingredients flow from top to bottom and are in count flow contact with hydrogen gas on the catalysts for carrying out hydrogenation sulfur and alcohol removal reaction, the liquid phase ingredients after the sulfur and alcohol removal flow out from the bottom of the reactor, the gas phase ingredients and other gas are discharged out from the top of the reactor, the gas phase ingredients after the condensation are mixed with the liquid phase ingredients discharged from the bottom of the tower and the light gasoline fractions subjected to the alkali washing for removing sulfur and alcohol to obtain gasoline products. When the method provided by the invention is adopted, the gasoline product with the sulfur and alcohol sulfur content lower than 3mug / g can be producted, and simultaneously, the total sulfur content of the gasoline product is reduced.

Description

technical field [0001] The invention relates to a method for hydrogenation and desulfurization of gasoline. More specifically, it is a method of reducing the sulfur content in gasoline and the sulfur content of regenerated mercaptans to produce low-sulfur gasoline. Background technique [0002] With the increasingly stringent environmental protection regulations, countries around the world have put forward stricter restrictions on the composition of engine fuels such as sulfur content, vapor pressure, benzene content, total aromatics content, and olefin content, among which the sulfur content in gasoline is particularly strict. At present, 90% to 99% of the sulfur in finished gasoline comes from FCC gasoline. Therefore, reducing the sulfur content of FCC gasoline is the key to reducing the sulfur content of finished gasoline. [0003] my country's FCC gasoline is the main blending component in the gasoline blending pool, with a mass fraction of more than 80%. FCC gasoline ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/00
Inventor 毛俊义黄涛高晓冬李明丰张占柱屈锦华
Owner CHINA PETROLEUM & CHEM CORP
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