Method for extracting and removing sulfur compound in crude oil

A compound and sulfide technology, which is applied in the petroleum industry, processing hydrocarbon oil, refining hydrocarbon oil, etc., can solve the problems of increasing desulfurization cost and cumbersome treatment process, and achieves low desulfurization treatment cost, easy preparation process and strong polarity. Effect

Active Publication Date: 2018-06-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of petroleum refining, the sulfides in crude oil will also be distributed in various distillates according to the boiling range, so it is necessary to desulfurize the various petroleum distillates separately, resulting in cumbersome processing and greatly increasing the cost of desulfurization

Method used

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  • Method for extracting and removing sulfur compound in crude oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Take 10.0g of crude oil A (sulfur content 1.16wt.%, moisture 3.55wt.%), add 1.5g of 30% hydrogen peroxide, and stir in a water bath at 50°C for 120min to obtain preoxidized crude oil A1.

[0038]Add 10.0 g of choline chloride / p-toluene acetic acid (molar ratio 1:1, freezing point 35°C) to the above preoxidized crude oil A1, extract in a water bath at 50°C for 30 minutes, take it out, and centrifuge at 4000 rpm for 3 minutes. 9.7g of the raffinate oil phase was collected, the sulfur content in it was reduced to 0.83wt.%, and the desulfurization rate was 28.4%; the water content in the oil was reduced to 2.53wt.%. Add 10.0 g of deionized water to the raffinate phase at 50° C., remove sulfur compounds by filtration, distill off water and dry to obtain a regenerated choline chloride / p-toluene acetic acid deep eutectic solvent.

Embodiment 2

[0040] Take 10.0g of crude oil A (sulfur content 1.16wt.%, moisture 3.55wt.%), add 0.5g of 30% hydrogen peroxide and 0.95g of sodium percarbonate, and stir in a water bath at 55°C for 90min to obtain preoxidized crude oil A2.

[0041] Add 10.0 g of choline chloride / p-toluene acetic acid (molar ratio 1:1, freezing point 35°C) to the above preoxidized crude oil A2, extract in a water bath at 55°C for 20 minutes, take it out, and centrifuge at 4000 rpm for 3 minutes. 9.6g of the raffinate oil phase was collected, the sulfur content in it was reduced to 0.70wt.%, and the desulfurization rate was 39.6%; the water content in the oil was reduced to 1.53wt.%. Add 10.0 g of deionized water to the raffinate phase at 55° C., filter to remove sulfur compounds, distill off water and dry to obtain a regenerated choline chloride / p-toluene acetic acid deep eutectic solvent.

Embodiment 3

[0043] Take 10.0g of crude oil B (sulfur content 0.64wt.%, moisture 6.25wt.%), add 1.1g of sodium percarbonate, and stir in a 60°C water bath for 70min to obtain preoxidized crude oil B1.

[0044] Add 10.0g choline chloride / L-malic acid (molar ratio 1:1, freezing point 18°C) to the above-mentioned preoxidized crude oil B1, extract in a water bath at 60°C for 30 minutes, take it out, and centrifuge at 4000rpm for 3 minutes. 9.8g of the raffinate oil phase was collected, the sulfur content in it was reduced to 0.42wt.%, and the desulfurization rate was 34.4%; the water content in the oil was reduced to 1.21wt.%. Add 10.0 g of deionized water to the raffinate phase at 60° C., filter to remove sulfur compounds, distill off water and dry to obtain a regenerated choline chloride / L-malic acid deep eutectic solvent.

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Abstract

The invention provides a method for extracting and removing a sulfur compound in crude oil. The method for extracting and desulfurating comprises the following steps that (1) liquid or solid superoxide serves as an oxidizing agent to conduct pre-oxidation treatment on the sulfur compound in crude oil; (2) an eutectic solvent serves as an extraction agent to extract sulfide from the pre-oxidized crude oil obtained in the step (1), and a raffinate oil phase on the upper layer, an extract phase on the middle layer and a solid oxidizing agent phase on the bottom layer are obtained after centrifugalization is conducted; (3) crude oil with the content of sulfide being low is obtained after the raffinate oil phase in the step (2) is separated; and (4) the sulfide in the extract phase in the step(2) is removed after the extraction phase is dissolved by adding water and is filtered, and the regenerated eutectic solvent is obtained after distillation and dehydration are conducted. According tothe method, on the basis that the polarity of the sulfur compound in the crude oil is improved by assistance of oxidation, the eutectic solvent serves as the extraction agent to conduct liquid-liquidextraction and removal on the sulfur compound in the crude oil, operation is easy and convenient, the condition is mild, the desulfurization degree is high, and the content of sulfide in the crude oilcan be effectively lowered.

Description

technical field [0001] The invention relates to the field of petrochemical clean production, in particular to a method for removing sulfur compounds in crude oil through oxidation-assisted deep eutectic solvent extraction. Background technique [0002] Crude oil is mainly composed of alkanes, cycloalkanes and aromatic hydrocarbons containing carbon and hydrogen elements, and also contains a considerable amount of sulfur-containing compounds. The sulfides in crude oil are generally mainly sulfides and thiophenes, and there are also a small amount of elemental sulfur, hydrogen sulfide, mercaptans, disulfides, sulfoxides and sulfones. The existence of these sulfur-containing compounds will have a great adverse effect on the processing of crude oil and the performance of petroleum refining oil products (including gasoline, diesel, kerosene, lubricating oil and wax oil, etc.), such as corrosion of petroleum processing equipment, poisoning catalyst Metal catalysts in the process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G21/00C10G53/14
CPCC10G21/00C10G53/14C10G2300/202
Inventor 宋林花李志恒阎艺轩王子兰江安
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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