Method for producing low-sulfur diesel-oil by oxidation desulfurization

A technology for oxidative desulfurization and oxidizing agent, applied in the direction of refining with oxygenated compounds, can solve problems such as increased cost and high cost, and achieve the effects of reducing production cost, shortening production process, and improving oxidation depth

Active Publication Date: 2006-08-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this scheme is that the removal of residual acid in the oil phase needs to be washed with alkali to produce alkali residue that pollutes the environment, and the harmless treatment of the latter requires high cost; the second is that the oil phase after removing residual acid requires Desolvent extraction and alumina adsorption are used to remove sulfur-containing compounds in the oil phase, while solvent extraction and alumina adsorption increase the cost of the entire desulfurization process.

Method used

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  • Method for producing low-sulfur diesel-oil by oxidation desulfurization
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  • Method for producing low-sulfur diesel-oil by oxidation desulfurization

Examples

Experimental program
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Effect test

Embodiment 1～3

[0035] Get 400 grams of diesel oil (embodiment 1: blended diesel oil, urging firewood: straight firewood=1: 1.5, sulfur-containing 1600 μ g / g; Embodiment 2: Middle East hydrogenated diesel oil, sulfur-containing 650 μ g / g; Embodiment 3: catalyzed diesel oil, Sulfur containing 3000 μg / g) was charged into a stirred reactor, heated to a constant temperature of 90°C while stirring, and mixed industrial hydrogen peroxide (30wt%) and industrial formic acid (85wt%) were continuously added. The total amount of hydrogen peroxide added is 3 times of the chemical demand when all sulfur is converted into sulfone, and the amount of formic acid added is 20 times (mol ratio) of the amount of hydrogen peroxide added. After reacting for 10 minutes, the temperature was lowered, the water phase and the oil phase were separated, and the sulfur content in the oil phase was measured. The analysis data are shown in Table 1.

Embodiment 4～6

[0037] The oil phase separated and obtained in Examples 1-3 is dehydrated and used as the raw material oil for the second-stage oxidation reaction for secondary reaction, and the other conditions are the same as in Examples 1-3. After the reaction, the oil-water phase was separated, and the sulfur content of the oil phase was measured. The results are listed in Table 1.

Embodiment 7～9

[0039] The oil phase separated and obtained in Examples 4-6 is dehydrated and used as the raw material oil for the third-stage oxidation reaction for the third reaction, and the other conditions are the same as those in Examples 1-3. After the reaction, the oil-water phase was separated, and the sulfur content of the oil phase was measured. The results are also listed in Table 1. The results of oxidation desulfurization experiments show that the sulfur content of diesel oil has been significantly reduced after multiple oxidations and separations.

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Abstract

This invention discloses an oxidizing and desulfurizing method for fraction oil including that the fraction oil and hydrogen peroxide are reacted in a multi-stage reactor where low level organic acid catalyst exists, the product in each stage reactor is separated in oil-water phase, the water phase product is recovered after the organic acid is removed and the oil phase product is taken as the feed of the next stage reactor, apart from the raw material oil from the above stage, the feed of each stage is added with organic acid and hydrogen peroxide, different reacting stages are determined according to the needs on sulfur by a product and its content and the fraction oil from the last stage is taken as the low sulfur product directly after being dehydrated, which leaves out the process of solvent extraction or adsorption to the oil phase products after the oxidizing reaction.

Description

technical field [0001] The invention relates to a method for oxidative desulfurization of distillate oil, in particular to a method for producing clean fuel by oxidative desulfurization of distillate containing sulfur diesel oil. Background technique [0002] Organosulfur compounds in fuel oil are hazardous substances. Combustion produces SO X Lead to the formation of acid rain, causing environmental pollution and damage to human health. For vehicle fuel, SO X For HC, CO, especially NO in automobile exhaust X And PM emissions have a significant role in promoting, resulting in an increase in pollution emissions. SO X It will also corrode the engine and reduce the life of the engine. In view of the hazards of sulfur in vehicle fuel oil, many countries and regions in the world have promulgated more stringent diesel standards. Faced with strict restrictions on the sulfur content of gasoline and diesel and the huge market demand for low-sulfur clean diesel, countries all o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G27/12
Inventor 黎元生齐慧敏王海波勾连科
Owner CHINA PETROLEUM & CHEM CORP
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