CN104548940A - Nanofiltration membrane pretreatment method for eliminating membrane separation oil-water emulsification - Google Patents
Nanofiltration membrane pretreatment method for eliminating membrane separation oil-water emulsification Download PDFInfo
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- CN104548940A CN104548940A CN201510015363.7A CN201510015363A CN104548940A CN 104548940 A CN104548940 A CN 104548940A CN 201510015363 A CN201510015363 A CN 201510015363A CN 104548940 A CN104548940 A CN 104548940A
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- 239000012528 membrane Substances 0.000 title claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000001728 nano-filtration Methods 0.000 title abstract description 18
- 238000000926 separation method Methods 0.000 title abstract description 10
- 238000004945 emulsification Methods 0.000 title abstract 3
- 238000002203 pretreatment Methods 0.000 title abstract 2
- 238000000034 method Methods 0.000 claims abstract description 36
- 239000003960 organic solvent Substances 0.000 claims abstract description 35
- 239000008367 deionised water Substances 0.000 claims abstract description 28
- 238000004140 cleaning Methods 0.000 claims abstract description 27
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims description 34
- 239000003795 chemical substances by application Substances 0.000 claims description 27
- 238000009472 formulation Methods 0.000 claims description 27
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 12
- 239000002569 water oil cream Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 5
- 239000012046 mixed solvent Substances 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 4
- 229950005499 carbon tetrachloride Drugs 0.000 claims description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 abstract 1
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 10
- 239000003921 oil Substances 0.000 description 9
- 235000019198 oils Nutrition 0.000 description 9
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 8
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 6
- 230000004907 flux Effects 0.000 description 6
- 235000019774 Rice Bran oil Nutrition 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 235000021323 fish oil Nutrition 0.000 description 5
- 239000008165 rice bran oil Substances 0.000 description 5
- 235000012424 soybean oil Nutrition 0.000 description 5
- 239000003549 soybean oil Substances 0.000 description 5
- FFRBMBIXVSCUFS-UHFFFAOYSA-N 2,4-dinitro-1-naphthol Chemical compound C1=CC=C2C(O)=C([N+]([O-])=O)C=C([N+]([O-])=O)C2=C1 FFRBMBIXVSCUFS-UHFFFAOYSA-N 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 235000013305 food Nutrition 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a nanofiltration membrane pretreatment method for eliminating membrane separation oil-water emulsification, which comprises the following steps: 3 steps of deionized water cleaning, compound reagent cleaning and organic solvent cleaning which is the same as the organic solvent used in the nanofiltration membrane production; the method can effectively solve the problem of oil-water emulsification of the oil substances and the residual water in the nanofiltration membrane.
Description
(1) technical field
The present invention relates to a kind of NF membrane preprocess method, particularly a kind ofly oily substance will be carried out to the NF membrane preprocess method of organic solvent nanofiltration membrane separation.This pretreatment mode effectively can solve the problem of water generation oil-water emulsion residual in oil and NF membrane.
(2) background technology
UF membrane occurs in 20 beginnings of the century, the new separation technology emerged rapidly after the sixties in 20th century.Membrane separation technique is a kind of method using pellicle to be separated, be at normal temperatures with the pressure differential of film both sides or potential difference for power, abstraction and purification is carried out to solute.Membrane separation technique is owing to having separation, concentrated, purifying and refining function concurrently, there are again efficient, energy-saving and environmental protection, the advantage that molecule level filters can be realized, more have filter process simple, be easy to the features such as control, therefore, the fields such as food, environmental protection, oil, water treatment, chemical industry are widely used at present, create huge economic benefit and social benefit, become one of most important means in current separation science.
In recent years, membrane separation technique, particularly organic solvent nanofiltration technology, as a kind of can realize molecule be separated technology and greatly paid close attention to.Its feature is can by the selection of NF membrane molecular cut off thus the close molecule of isolated molecule amount.
At present, the scope of application of organic solvent nanofiltration technology is also more and more wider, but the problem of oil-water emulsion can be run into when organic solvent nanofiltration process is carried out to oily substance, water generation oil-water emulsion residual in oil and nano filter membrance device, produce emulsion layer, the problem that film pressure shakiness and film damage can be caused.
At present, the method for head it off is then repeatedly rinse with the organic solvent identical with the organic solvent needed for production, but this measure not only causes cost up, also wastes time and energy.
(3) summary of the invention
The present invention relates to a kind of NF membrane preprocess method, particularly a kind ofly oily substance will be carried out to the NF membrane preprocess method of organic solvent nanofiltration membrane separation.
The present invention adopts following technical scheme:
Eliminate a NF membrane preprocess method for UF membrane oil-water emulsion, described method is carried out as follows:
(1) washed with de-ionized water: first use washed with de-ionized water 1 ~ 2 time, described cleaning method is: the storage liquid in first emptying nano filter membrance device, adds deionized water, at 0.1 ~ 1kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 10 ~ 30 minutes, then with 0.1 ~ 1kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 1 ~ 10 minute at low-pressure state, as one-period, and cycle operation 10 ~ 30 minutes; Described low-pressure state is 1 ~ 3kg/cm
2, high pressure conditions is 4 ~ 8kg/cm
2;
(2) formulation agents cleaning: then with formulation agents cleaning, repeat 1 ~ 2 time, described cleaning method is: the deionized water first in emptying nano filter membrance device, then adds formulation agents, at 0.1 ~ 1kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 10 ~ 30 minutes, then with 0.1 ~ 1kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 1 ~ 10 minute at low-pressure state, as one-period, and cycle operation 20 ~ 40 minutes; Described low-pressure state is 1 ~ 5kg/cm
2, high pressure conditions is 5 ~ 10kg/cm
2; Described formulation agents is selected from the mixed solvent of two or more arbitrary proportion in ethanol, chloroform, methyl alcohol, tetrachloromethane, deionized water;
(3) organic solvent that the organic solvent used when producing with the described NF membrane of application is identical cleans: finally clean with the organic solvent identical with the organic solvent used when producing, described cleaning method is: the formulation agents first in emptying nano filter membrance device, add the organic solvent identical with the organic solvent used when producing, at 0.1 ~ 2kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 10 ~ 30 minutes, then with 0.1 ~ 2kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 1 ~ 10 minute at low-pressure state, as one-period, and cycle operation 10 ~ 30 minutes; Described low-pressure state is 1 ~ 10kg/cm
2, high pressure conditions is 15 ~ 25kg/cm
2.
NF membrane preprocess method of the present invention, in step (2), preferably described formulation agents is the combination solution of ethanol, methyl alcohol and deionized water volume ratio 85:5:10.
In step (3), apply the organic solvent used when described NF membrane is produced to refer to: the organic solvent adopted in the concrete production process in the fields such as food, environmental protection, oil, water treatment, chemical industry, selected by the needs of oily substance different in concrete production process.The present invention is on the cleaning basis of step (1), (2), step (3) adopts the organic solvent identical with the organic solvent used when producing to carry out last cleaning to NF membrane, with the preprocess method of existing NF membrane---compared with repeatedly rinsing with the organic solvent identical with the organic solvent used when producing, reduce cost, simply efficiently.
NF membrane preprocess method of the present invention effectively can solve the problem of water generation oil-water emulsion residual in oily substance and NF membrane.
(4) accompanying drawing explanation
Fig. 1: embodiment 1 is without/mistake film pressure in the production process of the pretreated oryzanol utilized in organic solvent-nanofiltration enrichment rice bran oil change;
Fig. 2: embodiment 1 is without/membrane flux in the production process of the pretreated oryzanol utilized in organic solvent-nanofiltration enrichment rice bran oil change;
Fig. 3: embodiment 2 without/through pretreated utilize organic solvent-nanofiltration remove in the production process of the harmful substance in soybean oil mistake film pressure change;
Fig. 4: embodiment 2 without/through pretreated utilize organic solvent-nanofiltration remove in the production process of the harmful substance in soybean oil membrane flux change;
Fig. 5: embodiment 3 without/through pretreated utilize organic solvent-nanofiltration remove in the production process of the harmful substance in tunny fish oil mistake film pressure change;
Fig. 6: embodiment 3 without/through pretreated utilize organic solvent-nanofiltration remove in the production process of the harmful substance in tunny fish oil membrane flux change.
(5) detailed description of the invention
Below in conjunction with example, the present invention is further elaborated, but the present invention is not limited only to this.
Embodiment 1:
Utilize the oryzanol in organic solvent-nanofiltration enrichment rice bran oil, organic reagent used is acetone, and the mixture of rice bran oil and acetone is with before NF membrane separating treatment, and carry out pretreatment to NF membrane, its preprocess method is:
(1) washed with de-ionized water: first use washed with de-ionized water 2 times, described cleaning method is: the storage liquid in first emptying nano filter membrance device, adds deionized water, at 0.1kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 10 minutes, then with 0.1kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 2 minutes at low-pressure state, as one-period, and cycle operation 15 minutes; Described low-pressure state is 1kg/cm
2, high pressure conditions is 5kg/cm
2;
(2) formulation agents cleaning: then clean with formulation agents, described formulation agents is selected from the mixed solvent of ethanol and deionized water, mixed volume ratio is 85:15, repeat 1 time, described cleaning method is: the deionized water first in emptying nano filter membrance device, then formulation agents is added, at 0.3kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 10 minutes, then with 0.3kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 3 minutes at low-pressure state, as one-period, and cycle operation 20 minutes; Described low-pressure state is 2kg/cm
2, high pressure conditions is 10kg/cm
2;
(3) organic solvent-acetone that the organic solvent used when producing with the described NF membrane of application is identical cleans: finally clean with the organic solvent-acetone identical with the organic solvent used when producing, described cleaning method is: the formulation agents first in emptying nano filter membrance device, add acetone, at 0.1kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 10 minutes, then with 0.1kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 2 minutes at low-pressure state, as one-period, and cycle operation 10 minutes; Described low-pressure state is 3kg/cm
2, high pressure conditions is 15kg/cm
2.
The mixture of table 1 rice bran oil and acetone describes with without/outward appearance after pretreated NF membrane separating treatment respectively
| Without pretreatment | Layering, white emulsion layer and golden yellow mixture layer |
| Through pretreatment | Without layering, golden yellow |
Further, as seen from Figure 1, Figure 2, after pretreatment, cross the stable and flux depression speed of film pressure and obviously decline, show to effectively prevent water generation oil-water emulsion residual in oil and nano filter membrance device.
Embodiment 2:
Utilize organic solvent-nanofiltration to remove harmful substance in soybean oil, organic reagent used is n-hexane, and the mixture of soybean oil and n-hexane is with before NF membrane separating treatment, and carry out pretreatment to NF membrane, its preprocess method is:
(1) washed with de-ionized water: first use washed with de-ionized water 2 times, described cleaning method is: the storage liquid in first emptying nano filter membrance device, adds deionized water, at 0.1kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 10 minutes, then with 0.1kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 2 minutes at low-pressure state, as one-period, and cycle operation 15 minutes; Described low-pressure state is 1kg/cm
2, high pressure conditions is 5kg/cm
2;
(2) formulation agents cleaning: then clean with formulation agents, described formulation agents is selected from the mixed solvent of ethanol and deionized water, mixed volume ratio is 90:10, repeat 1 time, described cleaning method is: the deionized water first in emptying nano filter membrance device, then formulation agents is added, at 0.3kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 10 minutes, then with 0.3kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 3 minutes at low-pressure state, as one-period, and cycle operation 20 minutes; Described low-pressure state is 2kg/cm
2, high pressure conditions is 10kg/cm
2;
(3) organic solvent-normal hexane that the organic solvent used when producing with the described NF membrane of application is identical cleans: finally clean with the organic solvent-normal hexane identical with the organic solvent used when producing, described cleaning method is: the formulation agents first in emptying nano filter membrance device, add n-hexane, at 0.1kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 10 minutes, then with 0.1kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 2 minutes at low-pressure state, as one-period, and cycle operation 10 minutes; Described low-pressure state is 3kg/cm
2, high pressure conditions is 15kg/cm
2.
The mixture of table 2 soybean oil and n-hexane describes with without/outward appearance after pretreated NF membrane separating treatment respectively
| Without pretreatment | Layering, white emulsion layer and faint yellow oil reservoir |
| Through pretreatment | Without layering, faint yellow |
Further, from Fig. 3, Fig. 4, after pretreatment, cross the stable and flux depression speed of film pressure and obviously decline, show to effectively prevent water generation oil-water emulsion residual in oil and nano filter membrance device.
Embodiment 3:
Utilize organic solvent-nanofiltration to remove harmful substance in tunny fish oil, organic reagent used is normal heptane, and the mixture of tunny fish oil and normal heptane is with before NF membrane separating treatment, and carry out pretreatment to NF membrane, its preprocess method is:
(1) washed with de-ionized water: first use washed with de-ionized water 2 times, described cleaning method is: the storage liquid in first emptying nano filter membrance device, adds deionized water, at 0.2kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 8 minutes, then with 0.2kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 2 minutes at low-pressure state, as one-period, and cycle operation 12 minutes; Described low-pressure state is 1kg/cm
2, high pressure conditions is 5kg/cm
2;
(2) formulation agents cleaning: then clean with formulation agents, described formulation agents is selected from the mixed solvent of ethanol and deionized water, mixed volume ratio is 90:10, repeat 1 time, described cleaning method is: the deionized water first in emptying nano filter membrance device, then formulation agents is added, at 0.3kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 10 minutes, then with 0.3kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 3 minutes at low-pressure state, as one-period, and cycle operation 20 minutes; Described low-pressure state is 2kg/cm
2, high pressure conditions is 10kg/cm
2;
(3) the organic solvent normal heptane that the organic solvent used when producing with the described NF membrane of application is identical cleans: finally clean with the organic solvent normal heptane identical with the organic solvent used when producing, described cleaning method is: the formulation agents first in emptying nano filter membrance device, add normal heptane, at 0.1kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 10 minutes, then with 0.1kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 2 minutes at low-pressure state, as one-period, and cycle operation 10 minutes; Described low-pressure state is 3kg/cm
2, high pressure conditions is 15kg/cm
2.
The mixture of table 3 tunny fish oil and normal heptane describes with without/outward appearance after pretreated NF membrane separating treatment respectively
| Without pretreatment | Layering, white emulsion layer and golden yellow oil reservoir |
| Through pretreatment | Without layering, golden yellow |
Further, from Fig. 5, Fig. 6, after pretreatment, cross the stable and flux depression speed of film pressure and obviously decline, show to effectively prevent water generation oil-water emulsion residual in oil and nano filter membrance device.
Finally, it is also to be noted that what enumerate above is only several specific embodiments of the present invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be had.All distortion that those of ordinary skill in the art can directly derive from content disclosed by the invention or associate, all should think protection scope of the present invention.
Claims (2)
1. eliminate a NF membrane preprocess method for UF membrane oil-water emulsion, it is characterized in that, described method is carried out as follows:
(1) washed with de-ionized water: first use washed with de-ionized water 1 ~ 2 time, described cleaning method is: the storage liquid in first emptying nano filter membrance device, adds deionized water, at 0.1 ~ 1kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 10 ~ 30 minutes, then with 0.1 ~ 1kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 1 ~ 10 minute at low-pressure state, as one-period, and cycle operation 10 ~ 30 minutes; Described low-pressure state is 1 ~ 3kg/cm
2, high pressure conditions is 4 ~ 8kg/cm
2;
(2) formulation agents cleaning: then with formulation agents cleaning, repeat 1 ~ 2 time, described cleaning method is: the deionized water first in emptying nano filter membrance device, then adds formulation agents, at 0.1 ~ 1kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 10 ~ 30 minutes, then with 0.1 ~ 1kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 1 ~ 10 minute at low-pressure state, as one-period, and cycle operation 20 ~ 40 minutes; Described low-pressure state is 1 ~ 5kg/cm
2, high pressure conditions is 5 ~ 10kg/cm
2; Described formulation agents is selected from the mixed solvent of two or more arbitrary proportion in ethanol, chloroform, methyl alcohol, tetrachloromethane, deionized water;
(3) organic solvent that the organic solvent used when producing with the described NF membrane of application is identical cleans: finally clean with the organic solvent identical with the organic solvent used when producing, described cleaning method is: the formulation agents first in emptying nano filter membrance device, add the organic solvent identical with the organic solvent used when producing, at 0.1 ~ 2kg/cm
2under the pulse frequency of/min, the mistake film pressure of nano filter membrance device rises to high pressure from low pressure, after high pressure conditions maintains 10 ~ 30 minutes, then with 0.1 ~ 2kg/cm
2the pulse frequency of/min is down to low-pressure state from high pressure conditions, maintains 1 ~ 10 minute at low-pressure state, as one-period, and cycle operation 10 ~ 30 minutes; Described low-pressure state is 1 ~ 10kg/cm
2, high pressure conditions is 15 ~ 25kg/cm
2.
2. NF membrane preprocess method as claimed in claim 1, it is characterized in that, the formulation agents described in step (2) is the combination solution of ethanol, methyl alcohol and deionized water volume ratio 85:5:10.
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115491226A (en) * | 2021-06-17 | 2022-12-20 | 中国石油化工股份有限公司 | Method for recovering dewaxing solvent in heavy lubricant base oil filtrate |
| CN115491224A (en) * | 2021-06-17 | 2022-12-20 | 中国石油化工股份有限公司 | Method for recovering dewaxing solvent in light lubricating oil base oil filtrate |
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|---|---|---|---|---|
| JPS60220108A (en) * | 1984-04-17 | 1985-11-02 | Asahi Chem Ind Co Ltd | Washing method of ultrafiltration membrane |
| JPS62254805A (en) * | 1986-04-30 | 1987-11-06 | Japan Organo Co Ltd | Method for washing terminal reverse-osmosis membrane device |
| CN102049198A (en) * | 2009-10-30 | 2011-05-11 | 中国石油化工股份有限公司 | Method for flushing reverse osmosis membrane |
-
2015
- 2015-01-13 CN CN201510015363.7A patent/CN104548940B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60220108A (en) * | 1984-04-17 | 1985-11-02 | Asahi Chem Ind Co Ltd | Washing method of ultrafiltration membrane |
| JPS62254805A (en) * | 1986-04-30 | 1987-11-06 | Japan Organo Co Ltd | Method for washing terminal reverse-osmosis membrane device |
| CN102049198A (en) * | 2009-10-30 | 2011-05-11 | 中国石油化工股份有限公司 | Method for flushing reverse osmosis membrane |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115491226A (en) * | 2021-06-17 | 2022-12-20 | 中国石油化工股份有限公司 | Method for recovering dewaxing solvent in heavy lubricant base oil filtrate |
| CN115491224A (en) * | 2021-06-17 | 2022-12-20 | 中国石油化工股份有限公司 | Method for recovering dewaxing solvent in light lubricating oil base oil filtrate |
| CN115491226B (en) * | 2021-06-17 | 2024-03-26 | 中国石油化工股份有限公司 | Method for recovering dewaxing solvent in heavy lubricating oil base oil filtrate |
| CN115491224B (en) * | 2021-06-17 | 2024-03-26 | 中国石油化工股份有限公司 | Method for recovering dewaxing solvent in light lubricating oil base oil filtrate |
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