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Method for removing nitrogen-containing compounds in oil products by virtue of eutectic solvent extraction

A technology of deep eutectic solvent and nitrogen compound, which is applied in the field of chemical engineering, can solve the problems of high preparation cost and limit the large-scale application of ionic liquid extraction denitrification technology, and achieve low preparation cost, less pollution and high removal efficiency Effect

Active Publication Date: 2015-07-08
ZHEJIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Compared with traditional organic solvents, ionic liquids have the characteristics of almost no volatility, easy adjustment of structure and properties, which help to reduce environmental pollution in the denitrification process and obtain higher denitrification efficiency, but the preparation cost of ionic liquids is higher , which limits the large-scale application of ionic liquid extraction denitrification technology

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  • Method for removing nitrogen-containing compounds in oil products by virtue of eutectic solvent extraction

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Straight-run diesel oil (nitrogen content: 205 μg / g) and choline chloride / oxalic acid deep eutectic solvent (the molar ratio of choline chloride and oxalic acid is 1:1, and the freezing point is 34°C) at 40°C Single-stage extraction is carried out in a mixing and settling tank, and the mass flow ratio of straight-run diesel oil to deep eutectic solvent is 1:1. The raffinate oil was collected, washed with water, and dried to obtain denitrogenated oil (nitrogen content: 9.8 μg / g), the denitrogenation rate was 95.2%, and the yield of denitrogenated oil was 99.5%. Re-extracting the extract solution with n-hexane at 40°C to remove nitrogen-containing compounds therein, and then evaporating to remove residual n-hexane to obtain a regenerated choline chloride / oxalic acid deep eutectic solvent.

Embodiment 2

[0050] Put lubricating oil base oil (nitrogen content: 1390 μg / g) and choline chloride / urea deep eutectic solvent (the molar ratio of choline chloride and urea is 1:2, and the freezing point is lower than 25°C) at 35°C in Three-stage countercurrent extraction is carried out in the packed tower, and the mass flow ratio of deep eutectic solvent and lubricating oil is 1:1. The raffinate oil was collected, washed with water, and dried to obtain denitrogenated oil (nitrogen content: 48.7 μg / g), the denitrogenation rate was 96.5%, and the yield of denitrogenated oil was 99.1%. The extract was back-extracted with n-heptane at 50° C. to remove nitrogen-containing compounds therein, and then evaporated to remove the residual n-heptane to obtain a regenerated choline chloride / urea deep eutectic solvent.

Embodiment 3

[0052] Lubricating oil base oil (nitrogen content: 1390 μg / g) and choline chloride / phenylpropionic acid deep eutectic solvent (the molar ratio of choline chloride and phenylpropionic acid is 1:1, the freezing point is lower than 25 ℃) in Three-stage countercurrent extraction was carried out in a packed column at 40°C. The raffinate oil is collected, washed with water and dried to obtain denitrogenated oil. By changing the mass flow ratio of deep eutectic solvent and lubricating oil, different denitrification rates and denitrification oil yields were obtained (Table 1). The extract was back-extracted with n-heptane at 50°C to remove nitrogen-containing compounds, and then evaporated to remove the residual n-heptane to obtain a regenerated choline chloride / phenylpropionic acid deep eutectic solvent.

[0053] Table 1 Choline chloride / phenylpropionic acid deep eutectic solvent three-stage countercurrent extraction to remove nitrogen-containing compounds in lubricating oil (nitrog...

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Abstract

The invention discloses a method for removing nitrogen-containing compounds in oil products by virtue of eutectic solvent extraction. The method comprises the following steps: (1) by taking an oil product as a raw material liquid and a eutectic solvent as an extracting agent, performing single-stage extraction or multi-stage extraction in an extraction apparatus to obtain oil remained after extraction and a nitrogen-containing compound enriched extract; (2) washing the oil remained after extraction in the step (1) with water and drying to obtain denitrified; (3) performing back extraction on the extract in the step (1) by use of a weakly polar solvent to remote the nitrogen-containing compounds in the extract, and then evaporating to obtain the regenerated eutectic solvent. According to the method, based on a liquid-liquid two-phase system, the eutectic solvent is taken as the extracting agent and the nitrogen-containing compounds in the oil products are removed by virtue of single-stage extraction or multi-stage extraction; the operation process is simple, the denitrification percent is high and the oil product yield is high.

Description

technical field [0001] The invention relates to a method for removing nitrogen-containing compounds in oil products, which belongs to the technical field of chemical engineering, and in particular to a method for removing nitrogen-containing compounds in oil products by extraction with a deep eutectic solvent. Background technique [0002] Naphtha, gasoline, kerosene, diesel oil, lubricating oil, wax oil and other products obtained from petroleum refining (collectively referred to as oil products) contain a certain concentration of nitrogen-containing compounds, including basic nitrogen compounds and non-basic nitrogen compounds. Basic nitrogen compounds mainly include pyridine, quinoline, azaanthracene, azaphenanthrene, etc. and their homologues, while non-basic nitrogen compounds mainly include pyrrole, carbazole, indole, etc. and their homologues. The existence of these nitrogen-containing compounds has adverse effects on the chromaticity, anti-oxidation stability and per...

Claims

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Application Information

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IPC IPC(8): C10G21/20C10G21/18
CPCC10G21/16C10G21/18C10G21/20
Inventor 杨启炜M·C·阿里张治国鲍宗必苏宝根邢华斌任其龙
Owner ZHEJIANG UNIV
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