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Oxidation sweetening method of hydrogenated diesel oil

A technology for oxidative desulfurization and hydrogen diesel oil, applied in the direction of refining with oxygenated compounds, etc., can solve the problems of poor oil product yield, loss of distillate oil, and reduced yield, etc., to improve quality, improve yield, promote The effect of oxidation

Active Publication Date: 2007-04-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the oxidative desulfurization of the entire hydrogenated diesel oil fraction, followed by extraction and / or adsorption separation, will inevitably lose part of the oil fraction, resulting in a lower yield
Moreover, the amount of oxidant and acid is relatively large, and some side reactions are prone to occur. For example, USP6274785 points out that in the oxidation process, some hydrocarbons will be oxidized into acids, aldehydes, alcohols, ethers or other oxides, thereby making the oil Poor or lower oil yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 200 grams of hydrogenated diesel oil samples with a sulfur content of 407 μg / g (boiling range is 159 ° C ~ 364 ° C), and cut them into light fraction and heavy fraction at 290 ° C, wherein the heavy fraction accounts for 45.1 wt%, and the sulfur content is 867μg / g, accounting for 97.1wt% of the total sulfur in the original sample. Take the heavy distillate oil and put it into a round bottom flask for oxidative desulfurization. Add 1.5 ml concentration of 30wt% H under heating and stirring 2 o 2 and 1.5 ml of HCOOH at a constant temperature of 50°C for 15 minutes. A mixed solution of sodium hydroxide, methanol and water, wherein the concentration of sodium hydroxide is 0.5M, and the volume ratio of methanol and water is 9.5:1, is added to the oxidized diesel oil to neutralize, and the oil phase is separated. Then use N,N-dimethylformamide (DMF) as the extraction agent, the volume ratio of agent to oil is 1:1, and extract once at normal temperature. After the extr...

Embodiment 2

[0030] Take 200 grams of hydrogenated diesel oil with a sulfur content of 261 μg / g (boiling range is 157° C. to 362° C.), cut it into light fraction and heavy fraction at 300° C., wherein the heavy fraction accounts for 44.1 wt%, and the sulfur content is 604μg / g, accounting for 98.8wt% of the sulfur content in the original sample. Get the heavy distillate oil and put it into a round bottom flask, add 1 ml concentration of 30wt% H under heating and stirring 2 o 2and 1 ml of HCOOH at a constant temperature of 50°C for 15 minutes. A mixed solution of sodium hydroxide, methanol and water, wherein the concentration of sodium hydroxide is 1M, and the volume ratio of methanol and water is 9.0:1, is added to the oxidized diesel oil until neutral, and the oil phase is separated. Then use N,N-dimethylformamide (DMF) as the extraction agent, the volume ratio of the agent to oil is 1:1, and extract once at normal temperature. After the extraction, the sample is mixed with light distill...

Embodiment 3

[0034] Take 200 grams of hydrogenated diesel oil with a sulfur content of 261 μg / g (boiling range is 157° C. to 362° C.), cut it into light fraction and heavy fraction at 300° C., wherein the heavy fraction accounts for 44.1 wt%, and the sulfur content is 604μg / g, accounting for 98.8wt% of the sulfur content in the original sample. Get the heavy distillate oil and put it into a round bottom flask, add 1 ml concentration of 30wt% H under heating and stirring 2 o 2 and 1 ml of HCOOH at a constant temperature of 50°C for 15 minutes. A mixed solution of sodium hydroxide, methanol and water, wherein the concentration of sodium hydroxide is 1M, and the volume ratio of methanol and water is 9.0:1, is added to the oxidized diesel oil until neutral, and the oil phase is separated. Then use silica gel (specific surface 521m 2 / g, pore volume 0.45mg / l, dosage 20g) at room temperature, 0.11MPa, diesel volume space velocity 0.3h -1 Adsorption treatment is carried out, and the heavy fra...

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PUM

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Abstract

The invention disclosed an oxygenized desulphuring method of hydrogenated diesel oil distillate. The invention only treats the heavy distillate rather than the light distillate. The processing procedure comprises the following steps: dividing the hydrogenated diesel oil into light distillate and heavy distillate; adding the oxidant (the mole ratio of oxidant to sulphur is 2-10); adding the acid assistant (the mole ratio of the oxidant to the acid assistant is 0.5-3) to oxidize the sulphide into the sulfone; using extracting separation or adsorbing separation to remove the sulfone or sulfoxide substances in the diesel oil; mixing the heavy distillate with the light distillate to get the diesel oil with supra-low content of sulphur. The invention is especially applicable to the hydrogenated diesel oil distillate which contains less than 500500 mug / g sulphur. It can remove the dibenzothiophene substance effectively, the sulphur content of the product is less than 1010 mug / g while the oil vecovery rate is 5wt%-15wt% higher than the regular ways without fractional distillating process.

Description

technical field [0001] The invention relates to a method for oxidative desulfurization of diesel distillate oil, in particular to a method for oxidative desulfurization of diesel oil after oxygenation treatment. Background technique [0002] One of the important indicators of clean diesel is low sulfur content. At present, the sulfur content of diesel fuel enforced by developed countries is less than 350 μg / g, and some countries have implemented the standard of 50 μg / g, and it is expected to limit the sulfur content to less than 10 μg / g in a few years. In order to maintain and improve the environment, the country is also gradually increasing the restrictions on the sulfur content in diesel. At present, catalytic hydrogenation is one of the main methods for desulfurization of diesel oil, but when the sulfur content in the diesel fraction is hydrogenated to less than 500 μg / g, the remaining sulfur compounds in the oil are basically alkyl-substituted dibenzothiophenes class o...

Claims

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Application Information

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IPC IPC(8): C10G27/12
Inventor 王少军凌凤香张喜文钱迈原吴洪新
Owner CHINA PETROLEUM & CHEM CORP
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