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Oxidation sweetening process for diesel distillate

A technology of oxidative desulfurization and diesel oil, which is applied in the direction of refining oxygenated compounds, etc., can solve the problems of complex synthesis, high price, no mention of adsorbent regeneration method, etc., and achieve the effect of promoting oxidation and restoring adsorption capacity

Inactive Publication Date: 2005-11-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of catalyst has good catalytic activity, but the synthesis is complex and expensive
The removal of the oxidation product uses activated carbon, silica gel or alumina as the adsorbent for adsorption and separation, but the patent does not mention the regeneration method of the adsorbent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] The method of the invention is used to oxidize the hydrogenated diesel oil and then perform adsorption desulfurization.

[0017] Take 200 ml of hydrogenated diesel oil with a sulfur content of 300 μg / ml and put it into a 250 ml three-necked flask, add 1 ml of 30% H by weight under stirring at a constant temperature of 70°C 2 o 2 With 1 ml of acetic anhydride, react for 10 minutes. Add 100 ml of deionized water to wash away the acids in the oil. From gas chromatography-atomic emission spectrometry analysis, it can be known that the dibenzothiophene sulfides that are difficult to remove by hydrogenation in the oil have basically been oxidized into sulfone compounds. With 20 grams of silica gel (produced by Qingdao Ocean Chemical Factory) as the adsorbent, the surface area of ​​silica gel is 490 meters 2 / g, pore volume 0.43 ml / g, average pore diameter 3.6 nm. At 20°C, 0.11MPa, diesel volumetric space velocity 0.3 -1 The conditions for adsorption and separation of sul...

example 2

[0019] Carry out oxidative desulfurization to hydrogenated diesel oil by the method of example 1, difference is that the adsorbent used is gamma-alumina, and its surface area is 410 meters 2 / g, pore volume 0.40 ml / g, average pore diameter 3.1 nm. The sulfur content of diesel oil after adsorption separation is 23 μg / ml.

example 3

[0021] Take 100 milliliters of catalytically cracked diesel oil with a sulfur content of 1600 μg / ml and put it into a 250-ml three-neck flask, add 30 milliliters of 30% by weight of H under stirring at 70°C 2 o 2 and 10 ml of acetic anhydride for 30 minutes. Then carry out desulfurization with silica gel adsorbent according to the method of example, the sulfur content of diesel oil after adsorption separation is 54 micrograms / ml.

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Abstract

A process for diesel oil distillation oxidation sweetening comprises, adding in 0.1-20% diesel oil distillation volume of hydrogen dioxide and 0.1-20% acetic anhydride, reacting at the temperature of 30-90 deg. C, wherein the sulfide is oxygenized into sulfone or sulfoxide compounds, rinsing to remove acidic material, and removing sulfone or sulfoxide compounds from the diesel oil through adsorptive separation method. The catalyst has good regeneration effect and thus can be reutilized.

Description

technical field [0001] The invention relates to a method for oxidative desulfurization of diesel oil fractions, specifically, a method for oxidizing diesel oil with peroxide as an oxidant, and then performing desulfurization of diesel oil by means of adsorption and separation. Background technique [0002] Low sulfur content is an important indicator of clean diesel. At present, the sulfur content of diesel fuel enforced by developed countries is less than 350ppm, and may require diesel sulfur content to be less than 50ppm in the next few years. The main method of diesel desulfurization is catalytic hydrogenation. Studies have shown that after the sulfur content of diesel fractions is hydrogenated to 500ppm, the remaining sulfides are basically polyalkylated dibenzothiophene sulfides. Due to the large steric hindrance effect of polyalkyl-substituted dibenzothiophenes, it is difficult for sulfur atoms to contact the active centers on the catalyst surface, so the sulfur in thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G27/12
Inventor 朱纯峰李云龙刘泽龙
Owner CHINA PETROLEUM & CHEM CORP
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