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Based on supercritical co 2 Method for regenerating waste lubricating oil

A waste lubricating oil, supercritical technology, applied in the direction of lubricating composition, etc., can solve the problems of not specifically discussing the quality of regenerated oil, how to deal with waste lubricating oil, and not establishing high-pressure phase equilibrium data and solubility models, etc., to achieve metal The effect of content reduction, performance index improvement, and strong decontamination ability

Active Publication Date: 2022-03-15
LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the reference document does not discuss how to deal with waste lubricating oil, let alone establish supercritical CO 2 High-pressure phase equilibrium data and solubility models of typical single-component alkanes with base oils, and the quality of recycled oil is not specifically discussed

Method used

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  • Based on supercritical co <sub>2</sub> Method for regenerating waste lubricating oil
  • Based on supercritical co <sub>2</sub> Method for regenerating waste lubricating oil
  • Based on supercritical co <sub>2</sub> Method for regenerating waste lubricating oil

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Effect test

Embodiment 1

[0050] Explore the effect of pressure on the recovery oil yield;

[0051] The extraction temperature was set to 308.2K, the extraction time was 180min, and the influence of pressure on the yield of regenerated oil was investigated. The results figure 2 . Depend on figure 2 It can be seen that the yields of the two kinds of waste oil regeneration oil increase with the increase of pressure, supercritical CO 2 The extraction rate increased nearly 6 times within 8MPa pressure difference. This is because under the condition of constant temperature, the higher the extraction pressure, the higher the supercritical CO 2 The greater the density of the fluid, the stronger the solvation effect of the solvent, and the stronger the ability to dissolve substances. Therefore, the base oil components in supercritical CO 2 The solubility in the solution showed an increase. According to this, it can be seen that the size of the pressure is the most important factor affecting the supercri...

Embodiment 2

[0054] Explore the effect of temperature on the yield of recycled oil;

[0055] Set the extraction pressure to 16MPa, the extraction time to 180min, and investigate the influence of temperature on the yield of regenerated oil. The results are shown in image 3 . Depend on image 3 As shown, the recovery oil yield gradually decreased with the increase of temperature. temperature vs. supercritical CO 2 The extraction of base oil components has two effects: one is the temperature on the CO 2 Density effect, with increasing temperature, supercritical CO 2 Density decreases, leading to supercritical CO 2 The solvency of the waste oil decreases, so that the base oil components in the waste oil 2 The solubility in the medium decreases, and the extraction rate decreases; on the other hand, the influence of temperature on the vapor pressure of the solute, as the temperature increases, the vapor pressure of the solute increases, and the volatility increases, so that the solute in ...

Embodiment 3

[0058] Explore the effect of extraction time on the yield of recycled oil;

[0059] Set the extraction pressure to 16MPa, the extraction temperature to 308.2K, and investigate the influence of extraction time on the yield of regenerated oil. The results are shown in Figure 4 . Depend on Figure 4 As shown, with the prolongation of the extraction time, the recovery oil yield increased, and when the time was from 0 min to 180 min, supercritical CO 2 The extraction rate increased sharply, and the extraction basically reached equilibrium after 180 minutes. With the increase of time, the recovery oil yield increased slightly. In actual production, if the time is extended without limit to increase the yield of recycled oil, the cost will increase and the efficiency of equipment use will also decrease. Therefore, choosing a suitable and effective extraction time can make the yield of recycled oil high and the utilization efficiency of equipment high. .

[0060] Depend on Figur...

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Abstract

The present invention relates to a kind of based on supercritical CO 2 The method for regenerating waste lubricating oil belongs to the technical field of energy recovery and utilization, and the method is used in supercritical CO 2 extraction equipment, the supercritical CO 2 The extraction equipment includes an autoclave, the gas phase outlet of the autoclave is connected to an analysis device, and the analysis device includes steel cylinders whose inlets and outlets are respectively connected to needle valves, and the steel cylinders are placed in a mixture of ice and water; the method includes using liquid CO 2 Fully contact and extract the pretreated waste lubricating oil under stirring state, the base oil component obtained by extraction and separation flows into the steel cylinder, CO 2 The gas is vented and recycled. The method selects more than one waste lubricating oil as the experimental raw material, and uses the controlled variable method to explore the appropriate extraction temperature, pressure and time. Under suitable process conditions, the yield of regenerated oil reaches 19.8%, and the flash point, pour point, viscosity Index, acid value, sulfate ash and other performance indicators have been significantly improved, and the metal content has been significantly reduced.

Description

technical field [0001] The invention relates to the recovery, treatment and recovery of waste lubricating oil, belongs to the technical field of energy recovery and utilization, and specifically relates to a 2 Method for regenerating spent lubricating oil. Background technique [0002] At present, the annual discharge of waste lubricating oil is large, but there are only 1 to 25% impurities in the waste oil, and the rest of the components are reusable base oil components. Among them, lubricating oil is catalyzed by temperature, metal, etc. during the working process, and gradually deteriorates to produce various substances that are harmful to equipment and machinery, such as sand, clay, metal particles, and wood fibers that are insoluble in lubricating oil and mixed in from the outside. And mechanical impurities such as inorganic salts mixed in additives, oxidation products formed by high temperature oxidation, moisture, and various additives added to improve the performanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M175/00
CPCC10M175/0083C10M175/005C10M175/0033C10M175/0025
Inventor 杨鑫向硕苏鹏王晶朱立业何燕刘坪
Owner LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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