CN102660375A - Method for regenerating waste lubricating oil - Google Patents
Method for regenerating waste lubricating oil Download PDFInfo
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- CN102660375A CN102660375A CN2012101421263A CN201210142126A CN102660375A CN 102660375 A CN102660375 A CN 102660375A CN 2012101421263 A CN2012101421263 A CN 2012101421263A CN 201210142126 A CN201210142126 A CN 201210142126A CN 102660375 A CN102660375 A CN 102660375A
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Abstract
The invention provides a method for regenerating waste lubricating oil. The method comprises the following steps of: settling and drying the waste lubricating oil to obtain a first oil-containing mixture; refining the first oil-containing mixture by using an organic flocculant and a solvent to obtain a second oil-containing mixture, wherein the solvent is one or more of C2-C6 alcohol; performing centrifugal separation on the second oil-containing mixture, and distilling to obtain a third oil-containing mixture; and performing centrifugal separation on the third oil-containing mixture to obtain regenerated oil. According to the method, when the waste lubricating oil is refined, the solvent has a good effect of extracting lubricating oil, so that the yield of the obtained regenerated oil is relatively high. The experimental result shows that by the method for regenerating the waste lubricating oil, the yield is over 82 percent, the quality of the regenerated oil is relatively high, the production cost is saved, and the economic benefit is improved. In addition, the method for regenerating the waste lubricating oil is easy to operate, low in cost and environment-friendly, process conditions are mild, and production cycle is short.
Description
Technical field
The present invention relates to technical field of lubricating oil, particularly a kind of renovation process of waste lubricating oil.
Background technology
Lubricating oil is made up of lubricant base and oil dope etc. usually, and it in use can take place rotten and sneak into phenomenon such as impurity, its quality index is reduced and becomes waste lubricating oil.Owing to contain a large amount of, of great value lubricant base in the waste lubricating oil, if directly with waste lubricating oil as the offal treatment or applications that act as a fuel, not only cause the great wasting of resources, and aggravate environmental pollution.Therefore; Through suitable technique technology with waste lubricant oil regeneration; Transforming into the lubricating oil that can utilize again is a cause of benefiting the nation and the people; From preserving the ecological environment, safeguard health of the masses, practice thrift petroleum resources and reducing the aspects such as degree of dependence of China, have important practical significance to petroleum import.
At present, the producer of most domestic mainly adopts traditional sulfuric acid-clay-filtered technology regeneration waste lubricating oil, and this production technique is at first through purifying step such as sedimentation, filtration, coalescence, vacuum flashings; Remove water, part lightweight oil and mechanical impurity; Adopting concentration then is that 90% ~ 96% sulfuric acid carries out pickling to waste lubricating oil, under suitable temperature, stirs, and removes to contain oxygen, sulfur-bearing and compound such as nitrogenous in the waste lubricating oil; The vitriolic consumption is different because of oil quality; Generally, behind 20min ~ 30min, remove acid sludge through deposition below 10%; Carclazyte is added in the waste lubricating oil after the pickling again and carry out refining with adsorbents, the quality that the consumption of carclazyte also requires because of oil quality with to recovered oil is different, generally also below 10%; The carclazyte that will adsorb impurity through methods such as sedimentation, centrifugal and filtrations is at last removed, and obtains lubricant base.
Because the main raw material of this production technique is sulfuric acid and carclazyte, raw material is easy to get, cost is lower, and technical process is fairly simple, and is lower to the requirement of equipment, thereby uses more at home.But, the lubricant base of this production technique be the yield of recovered oil generally below 70%, yield is lower, can not satisfy social development and requirement on environmental protection better.
Summary of the invention
In order to solve above technical problem, the present invention provides a kind of renovation process of waste lubricating oil, and the yield of the recovered oil that method provided by the invention obtains is higher, is beneficial to and applies.
The invention provides a kind of renovation process of waste lubricating oil, may further comprise the steps:
A) waste lubricating oil is carried out sedimentation, drying, obtain first oil mixture;
B) said first oil mixture is made with extra care with organic floculant and solvent, obtained second oil mixture, said solvent is one or more in C2 ~ C6 alcohol;
C) said second oil mixture is carried out spinning, distillation, obtain the 3rd oil mixture;
D) said the 3rd oil mixture is carried out spinning, obtain recovered oil.
Preferably, the mass ratio of said solvent and said first oil mixture is 3 ~ 8:1.
Preferably, said organic floculant is SEPIGEL 305 or polymine.
Preferably, the mass ratio of said organic floculant and said first oil mixture is 0.9 ~ 1.8:100.
Preferably, said purified temperature is 25 ℃ ~ 60 ℃.
Preferably, the said purified time is 20min ~ 60min.
Preferably, in the said step c), the speed of said spinning is 1000r/min ~ 3000r/min, and the time of said spinning is 10min ~ 25min.
Preferably, said distillatory temperature is 80 ℃ ~ 140 ℃.
Preferably, in the said step d), the speed of said spinning is 2000r/min ~ 4000r/min, and the time of said spinning is 10min ~ 30min.
Compared with prior art, the present invention at first carries out sedimentation, drying with waste lubricating oil, obtains first oil mixture; Then said first oil mixture is made with extra care with organic floculant and solvent, obtained second oil mixture, said solvent is one or more in C2 ~ C6 alcohol; Again said second oil mixture is carried out spinning, distillation; Obtain the 3rd oil mixture, at last said the 3rd oil mixture is carried out spinning, obtain recovered oil.The present invention removes macrobead mechanical impurity wherein through the sedimentation waste lubricating oil, then the waste lubricating oil after the sedimentation is carried out drying, removes moisture, obtains first oil mixture; The present invention adopts organic floculant that said first oil mixture is flocculated; Removing fine-grained solids wherein, is solvent with in C2 ~ C6 alcohol one or more simultaneously, and said first oil mixture is extracted; Realize the purified effect, obtain second oil mixture; The present invention carries out removal of impurities through spinning to said second oil mixture, and through distillation, the said solvent of Separation and Recovery obtains the 3rd oil mixture again; The present invention utilizes spinning that said the 3rd oil mixture is carried out removal of impurities once more, obtains recovered oil.In the present invention, when refining, said solvent has effect of extracting preferably to lubricating oil, makes that the yield of the recovered oil that the present invention obtains is higher.Experimental result shows that the yield of the renovation process of waste lubricating oil provided by the invention is more than 82%, and the quality of recovered oil is better, has practiced thrift production cost greatly, has improved the economic benefit of regeneration waste lubricating oil.
In addition, the renovation process of waste lubricating oil provided by the invention is simple to operate, and processing condition are gentle, and are with low cost, with short production cycle, environmental protection.
Embodiment
In order further to understand the present invention, below in conjunction with embodiment the preferred embodiment of the invention is described, describe just to further specifying feature and advantage of the present invention but should be appreciated that these, rather than to the restriction of claim of the present invention.
The invention provides a kind of renovation process of waste lubricating oil, may further comprise the steps:
A) waste lubricating oil is carried out sedimentation, drying, obtain first oil mixture;
B) said first oil mixture is made with extra care with organic floculant and solvent, obtained second oil mixture, said solvent is one or more in C2 ~ C6 alcohol;
C) said second oil mixture is carried out spinning, distillation, obtain the 3rd oil mixture;
D) said the 3rd oil mixture is carried out spinning, obtain recovered oil.
Waste lubricating oil forms by lubricating oil rotten and that sneak into impurity in use takes place; Wherein contain a large amount of, of great value lubricant base, and impurity such as part mechanical impurity, moisture, oxygenatedchemicals, bituminous matter, colloid, additive and metal-salt.The present invention regenerates to waste lubricating oil, and obtaining lubricant base is recovered oil, meets in the recovered oil quality on the basis of request for utilization, and the yield of renovation process provided by the invention is higher, has reduced the cost of regeneration waste lubricating oil, has improved economic benefit.
The present invention at first carries out sedimentation, drying with waste lubricating oil, obtains first oil mixture.
In the present invention, said waste lubricating oil is the common waste lubricating oil in this area, and the present invention does not have particular restriction to it.The said waste lubricating oil of sedimentation of the present invention mainly is to utilize oil to separate with the density difference of mechanical impurity, removes macrobead mechanical impurity wherein; Said sedimentation is preferably natural subsidence, and the time of said natural subsidence is preferably 20h ~ 26h, and is simple to operate, and impurity-eliminating effect is good.The waste lubricating oil of the present invention after with sedimentation carries out drying, removes moisture; Said drying is preferably vacuum-drying, and said vacuum drying temperature is preferably 70 ℃ ~ 80 ℃; Said vacuum drying pressure is that vacuum tightness is preferably 0.3MPa ~ 0.6MPa, more preferably 0.4MPa ~ 0.5MPa; The said vacuum drying time is preferably 50min ~ 70min, more preferably 55min ~ 65min;
First oil mixture that cooling obtains, the present invention adopts organic floculant and solvent that it is made with extra care then, obtains second oil mixture, and said solvent is one or more in C2 ~ C6 alcohol.
When refining; The present invention adopts organic floculant that said first oil mixture is flocculated; Said organic floculant is generally water-soluble linear macromolecule, and most of ionizable in water, its chain molecule can produce the bonding bridging action; Charged group in the molecule plays the effect of charge neutrality compression to the diffusion layer of micelle, thereby can remove fine-grained solids such as particulate mechanical impurity and the oxygenatedchemicals etc. in said first oil mixture.Said organic floculant is preferably the organic amine flocculation agent, more preferably SEPIGEL 305 or polymine, and wherein, said SEPIGEL 305 is organic floculant commonly used, the molecular weight of said SEPIGEL 305 is preferably 5000 ~ 10000; The molecular weight of said polymine is generally 4000 ~ 7000.The mass ratio of said organic floculant and said first oil mixture is preferably 0.9 ~ 1.8:100, and more preferably 1.0 ~ 1.5:100 most preferably is 1.2 ~ 1.4:100.
When refining, the present invention is a solvent with in C2 ~ C6 alcohol one or more simultaneously, and said first oil mixture is extracted, and said solvent has effect of extracting preferably to lubricating oil, can make the yield of the recovered oil that the present invention obtains higher, and quality is better.In addition, the part oxygenatedchemicals in the waste lubricating oil that can also flocculate of one or more in said C2 ~ C6 alcohol has promoter action to flocculation.Said solvent is one or more in C2 ~ C6 alcohol, is preferably in C3 ~ C5 alcohol one or more, more preferably one or more in Virahol, isopropylcarbinol and the primary isoamyl alcohol; The mass ratio of said solvent and said first oil mixture is preferably 3 ~ 8:1, and more preferably 4 ~ 7:1 most preferably is 5 ~ 6:1.
In the present invention, said purified temperature is preferably 25 ℃ ~ 60 ℃, more preferably 30 ℃ ~ 50 ℃, most preferably is 35 ℃ ~ 45 ℃; The said purified time is preferably 20min ~ 60min, and more preferably 30min ~ 50min most preferably is 35min ~ 45min.The present invention makes with extra care under relatively mild condition, and need not harsh processing condition such as HTHP, and avoided acid sludge and contaminated wastewater, environmental protection, with short production cycle, efficient is high.
Behind refining the end, obtain second oil mixture, wherein comprise lubricating oil, solvent and solid impurity etc.The present invention carries out spinning, distillation with said second oil mixture, obtains the 3rd oil mixture.
The present invention utilizes spinning, mainly removes the solid impurity in said second oil mixture.The present invention does not have particular restriction to said spinning, and the speed of said spinning is preferably 1000r/min ~ 3000r/min, more preferably 1500r/min ~ 2500r/min; The time of said spinning is preferably 10min ~ 25min, more preferably 15min ~ 20min.
After spinning was accomplished, second oil mixture of the present invention after with spinning distilled, and said distillation is for the said solvent of Separation and Recovery, obtains comprising the 3rd oil mixture of a large amount of lubricating oil.Said distillation is reclaimed the efficient of said solvent generally more than 85%; Said distillatory temperature is preferably 80 ℃ ~ 140 ℃, more preferably 90 ℃ ~ 130 ℃, most preferably is 100 ℃ ~ 120 ℃.
After steaming said solvent, obtain the 3rd oil mixture, wherein the overwhelming majority is a lubricating oil.The 3rd oil mixture that cooling obtains, the present invention carries out spinning with it then, obtains recovered oil.
The present invention utilizes spinning once more, removes small amount of impurities such as black solid greasy filth in said the 3rd oil mixture.The present invention does not have particular restriction to said spinning, and the speed of said spinning is preferably 2000r/min ~ 4000r/min, more preferably 2500r/min ~ 3500r/min; The time of said spinning is preferably 10min ~ 30min, more preferably 15min ~ 25min.
After obtaining recovered oil, it is carried out the quality index test.Measure the content of gained regeneration W/O according to CNS GB/T8929-2006 " the mensuration distillation method of crude oil water content "; Measure the density of gained recovered oil according to CNS GB/T 2540-1981 " petroleum products densitometry (pycnometric method) "; Measure gained regeneration oil viscosity according to CNS GB/T 265-1988 " oil kinematic viscosity measuring method "; Measure the pour point of gained recovered oil according to CNS GB/T3535-2006 " petroleum products pour point assay method "; Measure gained regeneration oil flash according to CNS GB/T 3536-2008 " mensuration of petroleum products flash-point and burning-point "; Measure the acid number of gained recovered oil according to CNS GB/T 265-1983 " petroleum products determination of acid value method "; Measure the content of sulfated ash in the gained recovered oil according to CNS GB/T 2433-1981 " additive and doped lubricating oil sulfated ash assay method "; Measure the content of sulphur in the gained recovered oil according to TP SH/T 0689-2000 " the total sulfur content assay methods (ultraviolet fluorescence method) of light hydrocarbon and motor spirit and other oil products "; Measure the content of Zn, Ga, Fe, Mg in the gained recovered oil according to TP SH/T 0228-1992 " barium, calcium, zinc-content determination method (atomic absorption spectrometry) in the lubricating oil ".
Test result shows that the recovered oil that the renovation process of waste lubricating oil provided by the invention obtains satisfies each item index of lubricant base basically, and quality is better.The yield of the renovation process of waste lubricating oil provided by the invention has been practiced thrift production cost greatly more than 82%, has improved the economic benefit of regeneration waste lubricating oil.
In addition, the renovation process of waste lubricating oil provided by the invention is simple to operate, and processing condition are gentle, and are with low cost, with short production cycle, environmental protection.
In order further to understand the present invention, the renovation process of waste lubricating oil provided by the invention is described in detail below in conjunction with embodiment.
The used waste lubricating oil of following examples and comparative example is provided by Chongqing winged steed Auto repair shop, and the molecular weight of used SEPIGEL 305 is 5000 ~ 10000, available from Chemical Reagent Co., Ltd., Sinopharm Group.
Embodiment 1
The 2000g waste lubricating oil is carried out natural subsidence, behind the 24h, the waste lubricating oil after the natural subsidence is transferred in the vacuum drying oven; Open heater valve and vacuum valve, controlled temperature is 75 ℃, and vacuum tightness is 0.5MPa; Behind the vacuum-drying 60min, obtain first oil mixture, close heater valve and vacuum valve;
With getting the beaker that 100g places 1000mL after first oil mixture cooling that obtains, add 800g Virahol and 1.4g SEPIGEL 305, place again on the constant temperature magnetic force heating stirrer; Insert the temperature sense appearance; Open heater valve and stir valve, be warming up to 40 ℃, behind the refining 30min of constant temperature; Obtain second oil mixture, close heater valve and stir valve;
Second oil mixture that obtains is transferred to centrifuge tube, puts into whizzer, open time valve and speed-regulating valve, the speed of regulating spinning is 3000r/min, behind the spinning 10min, and shut valve and speed-regulating valve;
Second oil mixture after the spinning is imported in the distilling flask of 1L in the water distilling apparatus, open water coolant, second oil mixture after the heating spinning; Controlled temperature is 120 ℃; Distill out Virahol and, obtain the 3rd oil mixture, close water coolant its recycling;
With being transferred to centrifuge tube after the 3rd oil mixture cooling that obtains, put into whizzer, open time valve and speed-regulating valve; The speed of regulating spinning is 4000r/min, behind the spinning 12min, obtains 82.4g recovered oil; Yield is 82.4%, shut valve and speed-regulating valve.
The recovered oil that obtains in the centrifuge tube is imported in the beaker; According to method mentioned above it is carried out the quality index test; Test result is referring to table 1, and table 1 is the quality index of used waste lubricating oil in the embodiment of the invention, the comparative example, gained recovered oil and lubricant base 150SN.
Embodiment 2
The 2000g waste lubricating oil is carried out natural subsidence, behind the 24h, the waste lubricating oil after the natural subsidence is transferred in the vacuum drying oven; Open heater valve and vacuum valve, controlled temperature is 75 ℃, and vacuum tightness is 0.5MPa; Behind the vacuum-drying 60min, obtain first oil mixture, close heater valve and vacuum valve;
With getting the beaker that 100g places 1000mL after first oil mixture cooling that obtains, add 500g isopropylcarbinol and 1.2g SEPIGEL 305, place again on the constant temperature magnetic force heating stirrer; Insert the temperature sense appearance; Open heater valve and stir valve, be warming up to 40 ℃, behind the refining 30min of constant temperature; Obtain second oil mixture, close heater valve and stir valve;
Second oil mixture that obtains is transferred to centrifuge tube, puts into whizzer, open time valve and speed-regulating valve, the speed of regulating spinning is 3000r/min, behind the spinning 8min, and shut valve and speed-regulating valve;
Second oil mixture after the spinning is imported in the distilling flask of 1L in the water distilling apparatus, open water coolant, second oil mixture after the heating spinning; Controlled temperature is 120 ℃; Distill out isopropylcarbinol and, obtain the 3rd oil mixture, close water coolant its recycling;
With being transferred to centrifuge tube after the 3rd oil mixture cooling that obtains, put into whizzer, open time valve and speed-regulating valve; The speed of regulating spinning is 4000r/min, behind the spinning 15min, obtains 87.6g recovered oil; Yield is 87.6%, shut valve and speed-regulating valve.
The recovered oil that obtains in the centrifuge tube is imported in the beaker, according to method mentioned above it is carried out the quality index test, test result is referring to table 1.
Embodiment 3
The 2000g waste lubricating oil is carried out natural subsidence, behind the 24h, the waste lubricating oil after the natural subsidence is transferred in the vacuum drying oven; Open heater valve and vacuum valve, controlled temperature is 75 ℃, and vacuum tightness is 0.5MPa; Behind the vacuum-drying 60min, obtain first oil mixture, close heater valve and vacuum valve;
With getting the beaker that 100g places 1000mL after first oil mixture cooling that obtains, add 100g Virahol, 400g primary isoamyl alcohol and 1.2g SEPIGEL 305, place again on the constant temperature magnetic force heating stirrer; Insert the temperature sense appearance; Open heater valve and stir valve, be warming up to 40 ℃, behind the refining 30min of constant temperature; Obtain second oil mixture, close heater valve and stir valve;
Second oil mixture that obtains is transferred to centrifuge tube, puts into whizzer, open time valve and speed-regulating valve, the speed of regulating spinning is 3000r/min, behind the spinning 8min, and shut valve and speed-regulating valve;
Second oil mixture after the spinning is imported in the distilling flask of 1L in the water distilling apparatus; Open water coolant; Second oil mixture of heating after the spinning, controlled temperature is 120 ℃, distills out Virahol and primary isoamyl alcohol and with its recycling; Obtain the 3rd oil mixture, close water coolant;
With being transferred to centrifuge tube after the 3rd oil mixture cooling that obtains, put into whizzer, open time valve and speed-regulating valve; The speed of regulating spinning is 4000r/min, behind the spinning 15min, obtains 90.3g recovered oil; Yield is 90.3%, shut valve and speed-regulating valve.
The recovered oil that obtains in the centrifuge tube is imported in the beaker, according to method mentioned above it is carried out the quality index test, test result is referring to table 1.
Comparative example
This comparative example only adds Virahol when refining, do not add SEPIGEL 305, and all the other steps are identical with embodiment 1, obtain 77.2g recovered oil, and yield is 77.2%.
According to method mentioned above gained recovered oil is carried out the quality index test, test result is referring to table 1.
Can know that by the foregoing description the yield of the renovation process of waste lubricating oil provided by the invention has been practiced thrift production cost greatly more than 82%, improve the economic benefit of regeneration waste lubricating oil.Used waste lubricating oil, gained recovered oil and lubricate oil base in table 1 embodiment of the invention, the comparative example
The quality index of plinth oil 150SN
Wherein, " report " be meant that the index of correlation of lubricant base 150SN does not have strict mensuration requirement, as measuring, is as the criterion with the practical measurement data.
Can be known that by table 1 recovered oil that the renovation process of waste lubricating oil provided by the invention obtains satisfies each item index of lubricant base basically, quality is better.
The explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (9)
1. the renovation process of a waste lubricating oil may further comprise the steps:
A) waste lubricating oil is carried out sedimentation, drying, obtain first oil mixture;
B) said first oil mixture is made with extra care with organic floculant and solvent, obtained second oil mixture, said solvent is one or more in C2 ~ C6 alcohol;
C) said second oil mixture is carried out spinning, distillation, obtain the 3rd oil mixture;
D) said the 3rd oil mixture is carried out spinning, obtain recovered oil.
2. renovation process according to claim 1 is characterized in that, the mass ratio of said solvent and said first oil mixture is 3 ~ 8:1.
3. renovation process according to claim 1 is characterized in that, said organic floculant is SEPIGEL 305 or polymine.
4. renovation process according to claim 1 is characterized in that, the mass ratio of said organic floculant and said first oil mixture is 0.9 ~ 1.8:100.
5. renovation process according to claim 1 is characterized in that, 25 ℃ ~ 60 ℃ of said purified temperature.
6. renovation process according to claim 1 is characterized in that, the said purified time is 20min ~ 60min.
7. renovation process according to claim 1 is characterized in that, in the said step c), the speed of said spinning is 1000r/min ~ 3000r/min, and the time of said spinning is 10min ~ 25min.
8. renovation process according to claim 1 is characterized in that, said distillatory temperature is 80 ℃ ~ 140 ℃.
9. renovation process according to claim 1 is characterized in that, in the said step d), the speed of said spinning is 2000r/min ~ 4000r/min, and the time of said spinning is 10min ~ 30min.
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| CN2012101421263A CN102660375A (en) | 2012-05-09 | 2012-05-09 | Method for regenerating waste lubricating oil |
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Cited By (10)
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| CN103865625A (en) * | 2014-03-05 | 2014-06-18 | 重庆工商大学 | Method for solvent extraction regeneration of waste engine oil |
| CN104726192A (en) * | 2015-03-03 | 2015-06-24 | 东南大学 | Flocculant recycling-type waste oil regeneration integrated device and application thereof |
| CN105219512A (en) * | 2015-10-15 | 2016-01-06 | 上海应用技术学院 | A kind of useless steel rolling oil recovery treatment process |
| CN105316099A (en) * | 2015-12-07 | 2016-02-10 | 济南大学 | Method for regenerating base oil by using used oil |
| CN107216908A (en) * | 2017-07-23 | 2017-09-29 | 张家彬 | A kind of used oil extraction tower pitch discharge technique |
| CN109735391A (en) * | 2019-02-19 | 2019-05-10 | 安徽国孚凤凰科技有限公司 | A method of improving solvent refining reclaimed oil base oil yield |
| CN110157538A (en) * | 2019-05-30 | 2019-08-23 | 中国人民解放军陆军勤务学院 | Based on green solvent waste oil disposal |
| CN110724563A (en) * | 2019-08-30 | 2020-01-24 | 浙江工业大学 | Method for regenerating waste engine oil by combining solvent extraction and extraction centrifugation |
| EA039347B1 (en) * | 2020-02-12 | 2022-01-17 | Кейкавус Юсиф оглы Аджамов | Waste lubricating oils cleaning method |
| CN115287116A (en) * | 2022-07-05 | 2022-11-04 | 陕西建工安装集团 | Waste lubricating oil treatment method based on eutectic solvent |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103865625A (en) * | 2014-03-05 | 2014-06-18 | 重庆工商大学 | Method for solvent extraction regeneration of waste engine oil |
| CN104726192B (en) * | 2015-03-03 | 2017-11-03 | 东南大学 | A kind of flocculant recovery type waste oil regeneration integrating device and its application |
| CN104726192A (en) * | 2015-03-03 | 2015-06-24 | 东南大学 | Flocculant recycling-type waste oil regeneration integrated device and application thereof |
| CN105219512A (en) * | 2015-10-15 | 2016-01-06 | 上海应用技术学院 | A kind of useless steel rolling oil recovery treatment process |
| CN105316099B (en) * | 2015-12-07 | 2018-08-14 | 济南大学 | A kind of method of regenerating waste oil base oil |
| CN105316099A (en) * | 2015-12-07 | 2016-02-10 | 济南大学 | Method for regenerating base oil by using used oil |
| CN107216908A (en) * | 2017-07-23 | 2017-09-29 | 张家彬 | A kind of used oil extraction tower pitch discharge technique |
| CN109735391A (en) * | 2019-02-19 | 2019-05-10 | 安徽国孚凤凰科技有限公司 | A method of improving solvent refining reclaimed oil base oil yield |
| CN109735391B (en) * | 2019-02-19 | 2021-06-04 | 安徽国孚凤凰科技有限公司 | Method for improving yield of base oil of solvent refined regenerated lubricating oil |
| CN110157538A (en) * | 2019-05-30 | 2019-08-23 | 中国人民解放军陆军勤务学院 | Based on green solvent waste oil disposal |
| CN110724563A (en) * | 2019-08-30 | 2020-01-24 | 浙江工业大学 | Method for regenerating waste engine oil by combining solvent extraction and extraction centrifugation |
| EA039347B1 (en) * | 2020-02-12 | 2022-01-17 | Кейкавус Юсиф оглы Аджамов | Waste lubricating oils cleaning method |
| CN115287116A (en) * | 2022-07-05 | 2022-11-04 | 陕西建工安装集团 | Waste lubricating oil treatment method based on eutectic solvent |
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Application publication date: 20120912 |