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
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[0047] Example 1
[0048] Combine straight-run diesel (nitrogen content: 205μg / g) and choline chloride / oxalic acid eutectic solvent (the molar ratio of choline chloride to oxalic acid is 1:1, and the freezing point is 34°C) at 40°C Single-stage extraction is carried out in a mixed clarification tank, and the mass flow ratio of straight-run diesel oil and eutectic solvent is 1:1. The raffinate oil is collected, washed with water and dried to obtain a denitrified oil (nitrogen content: 9.8 μg / g), the denitrification rate is 95.2%, and the denitrification oil yield is 99.5%. The extract is stripped with n-hexane at 40° C. to remove nitrogen-containing compounds, and then evaporated to remove the remaining n-hexane to obtain a regenerated choline chloride / oxalic acid eutectic solvent.
Example Embodiment
[0049] Example 2
[0050] The lubricating base oil (nitrogen content: 1390μg / g) and choline chloride / urea eutectic solvent (the molar ratio of choline chloride to urea is 1:2, and the freezing point is lower than 25°C) at 35°C Three-stage countercurrent extraction is carried out in the packed tower, and the mass flow ratio of the eutectic solvent to the lubricating oil is 1:1. The raffinate oil is collected, washed with water and dried to obtain a denitrified oil (nitrogen content: 48.7 μg / g), the denitrification rate is 96.5%, and the denitrification oil yield is 99.1%. The extract is stripped with n-heptane at 50° C. to remove nitrogen-containing compounds, and then evaporated to remove the remaining n-heptane to obtain a regenerated choline chloride / urea eutectic solvent.
Example Embodiment
[0051] Example 3
[0052] Combine lubricating base oil (nitrogen content: 1390μg / g) with choline chloride / phenylpropionic acid eutectic solvent (the molar ratio of choline chloride to phenylpropionic acid is 1:1, and the freezing point is lower than 25℃). Three-stage countercurrent extraction is carried out in a packed tower at 40°C. The raffinate oil is collected, washed with water, and dried to obtain denitrified oil. Changing the mass flow ratio of eutectic solvent to lubricating oil, different denitrification rates and denitrification oil yields were obtained (Table 1). The extract is stripped with n-heptane at 50°C to remove nitrogen-containing compounds, and then evaporated to remove the remaining n-heptane to obtain a regenerated choline chloride / phenylpropionic acid eutectic solvent.
[0053] Table 1 Choline chloride / phenylpropionic acid eutectic solvent three-stage countercurrent extraction to remove nitrogen compounds from lubricating oil (nitrogen content: 1390μg / g), 4...
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