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Method for regenerating waste oil through extraction with combination of N,N-dimethylformamide (DMF) and n-hexanol

A technology of dimethylformamide and n-hexanol, applied in the field of lubricating oil, can solve the problems of high investment cost, large equipment volume, low oil product quality and yield, etc., and achieves high economic benefits, wide sources and convenient operation. Effect

Inactive Publication Date: 2015-03-11
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are the following disadvantages: (1) Due to the high viscosity of the oil, the permeation flux of the oil through the membrane is extremely small, and the pores of the membrane are easily polluted or blocked, which affects the separation effect; (2) The structure of the molecular distillation equipment is complex, and the corresponding There are many supporting equipment and large investment; and limited by the equipment structure and heating area, the volume of the equipment is larger than that of conventional distillation equipment, which is difficult to apply in large-scale production
However, the disadvantage of this patent is that adding a large amount of white clay will cause secondary pollution
[0007] To sum up, at present, waste oil recycling technologies and processes generally have shortcomings such as high environmental pollution, high investment costs, and low oil quality and yield.

Method used

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  • Method for regenerating waste oil through extraction with combination of N,N-dimethylformamide (DMF) and n-hexanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Dry 50g of waste oil in a 50°C constant temperature drying oven for 24 hours to remove part of the water and separate large particles of impurities;

[0052] Pour the supernatant clear oil obtained after settling and drying into a 1000mL beaker after cooling, add 400g of a mixed solution of DMF and n-hexanol (DMF: n-hexanol = 1:4), and add 2.5g of diethanolamine at the same time, and then place it under constant temperature magnetic heating On the stirrer, turn on the heating switch and the stirring switch, raise the temperature to 45°C, control the rotation speed at 1000r / min, and after extracting and refining at a constant temperature for 1 hour, stop heating and stirring to obtain an oily mixture;

[0053] Transfer the obtained oil-containing mixture to a separatory funnel, put it into a constant temperature box, control the temperature at a constant 50°C, and settle for 24 hours;

[0054] Remove the supernatant from the oil-containing mixture after constant temperat...

Embodiment 2

[0057] Dry 50g of waste oil in a 70°C constant temperature drying oven for 10 hours to remove part of the water and separate large particles of impurities;

[0058] Pour the supernatant clear oil obtained after settling and drying into a 500mL beaker after cooling, add 200g of a mixed solution of DMF and n-hexanol (DMF: n-hexanol = 4:1), and add 5g of diethanolamine at the same time, and then place it under constant temperature magnetic heating and stirring On the mixer, turn on the heating switch and the stirring switch, raise the temperature to 60°C, control the rotating speed at 1000r / min, and after refining at constant temperature for 2 hours, stop heating and stirring to obtain an oily mixture;

[0059] Transfer the obtained oil-containing mixture to a separatory funnel, put it into a constant temperature box, control the temperature at a constant 70°C, and settle for 11 hours;

[0060] Remove the supernatant liquid from the oil-containing mixture after constant temperatu...

Embodiment 3

[0063] Dry 50g of waste oil in a 55°C constant temperature drying oven for 20 hours to remove part of the water and separate large particles of impurities;

[0064] Pour the supernatant clear oil obtained after settling and drying into a 500mL beaker after cooling, add 250g of a mixed solution of DMF and n-hexanol (DMF: n-hexanol = 1:1), and add 4g of diethanolamine at the same time, then place it in a constant temperature magnetic heating stirrer Step 1, turn on the heating switch and stirring switch, raise the temperature to 50°C, control the rotation speed at 1000r / min, and after refining at constant temperature for 1.5h, stop heating and stirring to obtain an oily mixture;

[0065] Transfer the obtained oil-containing mixture to a separatory funnel, put it into a constant temperature box, control the temperature at a constant 55°C, and settle for 20 hours;

[0066] Remove the supernatant liquid from the oil-containing mixture after constant temperature settlement, introduc...

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Abstract

The invention provides a method for regenerating waste oil through extraction with combination of N,N-dimethylformamide (DMF) and n-hexanol. The method comprises following steps: (1) sedimentation and drying: filling a container with waste oil, performing the sedimentation and the drying in a constant-temperature box and taking upper-layer clear oil; (2) extraction and purification; adding an organic solvent to the upper-layer clear oil after filtration, wherein the organic solvent is composed of an extraction solvent DMF, the n-hexanol and a solvent additive diethanol amine; and (3) sedimentation and distillation: feeding an oil-containing mixture after the extraction and purification into the constant-temperature box for sedimentation, and performing distillation to an upper-layer clear oil to obtain the regenerated oil. During the extraction and purification, the organic solvent has a good extracting effect on the waste oil and the solvent additive can promote sedimentation of nonideal components in the waste oil so that purification efficiency is increased. An experimental result proves that the waste oil regenerating is high in yield and is good in quality of the regenerated oil. In addition, the regenerating method is simple in operation and is mild in technical conditions. The solvent can be recycled. The method is low in cost and is good in economic benefit.

Description

technical field [0001] The invention relates to the technical field of lubricating oil, in particular to a method for regenerating waste oil. Background technique [0002] Lubricating oil is a high value-added product extracted from petroleum, but the yield is extremely low. At least 5 tons of crude oil are needed to produce 1 ton of lubricating oil. During the use of lubricating oil, its properties will deteriorate due to physical, chemical or human factors, and pollutants such as water, oxides, carbon black, organic acids and mechanical impurities will be produced, making it unusable and becoming waste lubricating oil. At present, most of the waste oil treatment methods in my country are directly burned or discarded as fuel. China consumes more than 7 million tons of lubricating oil every year, and the waste oil recycled is less than 1 million tons. Waste oil is actually not waste, the metamorphic component is only a few percent of it, and the main body is still base oil....

Claims

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Application Information

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IPC IPC(8): C10M175/02C10G53/04
Inventor 欧阳平杨小平张贤明陈凌刘先斌
Owner CHONGQING TECH & BUSINESS UNIV
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