CN114681956A - Emulsion breaking method and application thereof - Google Patents
Emulsion breaking method and application thereof Download PDFInfo
- Publication number
- CN114681956A CN114681956A CN202210417801.2A CN202210417801A CN114681956A CN 114681956 A CN114681956 A CN 114681956A CN 202210417801 A CN202210417801 A CN 202210417801A CN 114681956 A CN114681956 A CN 114681956A
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- China
- Prior art keywords
- emulsion
- demulsification
- water
- corona discharge
- oil
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- 239000000839 emulsion Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000006185 dispersion Substances 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 14
- 239000010723 turbine oil Substances 0.000 claims description 11
- 238000011069 regeneration method Methods 0.000 claims description 6
- 230000008929 regeneration Effects 0.000 claims description 5
- 239000010705 motor oil Substances 0.000 claims description 2
- 239000004519 grease Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 37
- 230000005686 electrostatic field Effects 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000004888 barrier function Effects 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 abstract 1
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 208000028659 discharge Diseases 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 239000003921 oil Substances 0.000 description 9
- 235000019198 oils Nutrition 0.000 description 9
- 238000000926 separation method Methods 0.000 description 8
- 239000002699 waste material Substances 0.000 description 7
- 239000008367 deionised water Substances 0.000 description 6
- 229910021641 deionized water Inorganic materials 0.000 description 6
- 230000005684 electric field Effects 0.000 description 6
- 238000004581 coalescence Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 239000004006 olive oil Substances 0.000 description 3
- 235000008390 olive oil Nutrition 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002569 water oil cream Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/06—Separation of liquids from each other by electricity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G33/00—Dewatering or demulsification of hydrocarbon oils
- C10G33/02—Dewatering or demulsification of hydrocarbon oils with electrical or magnetic means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
Abstract
The application relates to a demulsification method of emulsion and application thereof. The demulsification method is characterized in that corona discharge is applied to the periphery of an emulsion to be subjected to demulsification treatment, wherein the emulsion is a water-containing dispersion system. In the scheme, the ion injection generated by corona discharge can cause the electric convection of non-water components in the emulsion, destroy water drop chains existing in the electrostatic field demulsification in the related technology, and greatly improve the efficiency of electrostatic field demulsification while preventing the secondary splitting of water drops. The corona discharge method is non-contact and does not cause corrosion due to exposure of the electrodes to the emulsion. The air gap between the corona generating electrode and the emulsion may act as a current barrier, thereby improving the safety of the demulsification process.
Description
Technical Field
The application relates to the technical field of separation, in particular to a demulsification method of emulsion and application thereof.
Background
The problem that the turbine oil system of the steam turbine is ubiquitous and difficult to thoroughly solve is that the turbine oil is easy to emulsify. The traditional physical demulsification dehydration method for oil-water emulsion mainly comprises a gravity settling method, an adsorption method, a centrifugal method, a vacuum method, a coalescence method, a membrane separation method and the like. Among them, the sedimentation method, the adsorption method and the membrane separation method have low processing precision, and are difficult to meet the requirements when the emulsion with complex structure and chemical composition is dehydrated; the centrifugal method has higher use and maintenance cost and poor separation effect on emulsion with smaller liquid drops; the filtration method and the drying method have low processing capacity, and the methods are not widely applied in industry. In addition, the novel demulsification technologies such as a microwave method and an ultrasonic method are still in an exploration and research stage at present, and have a gap from industrial application.
In the related technology, the method for demulsifying and dehydrating the emulsion by using the electrostatic field is mature and applied in industrial production for many years, and the action principle is that the emulsion is placed in the electric field to drive the dispersed phase water drops to polarize and migrate, so that the contact and coalescence of the water drops are promoted, and finally, the sedimentation occurs, so that the emulsion is demulsified. Compared with other demulsification technologies, the electric field demulsification method has the advantages of high efficiency, low cost, convenience in operation, simple equipment, small occupied area, no secondary pollution and the like, so that the electric field demulsification method has important research value and wide application prospect in oil-water demulsification.
The related technology of the demulsification can not be applied to the emulsion with low water content (the water content is less than or equal to 5 percent).
Disclosure of Invention
In view of this, the present application provides a demulsification method for an emulsion and a regeneration method for turbine oil, which can be applied to an emulsion with a relatively low water content and obtain a relatively good demulsification effect.
It has been generally recognized that in the related art, electrostatic field demulsification is difficult to be applied to emulsion systems with lower water content, especially in emulsions with low water content of less than or equal to 5%, and the interaction force between water drops is often required to be increased by increasing the electric field intensity so as to realize coalescence between the water drops. However, as the electric field intensity is increased, the emulsion is likely to form water drop chains between the electrodes, and secondary splitting of the water drops occurs in the coalescence process, so that the electric field demulsification method is low in efficiency in the emulsion with low water content, and the demulsification effect is not obvious.
The inventor surprisingly found that when corona discharge is used for acting on the aqueous emulsion, ion flow released by the corona discharge interacts with the aqueous emulsion to promote the coalescence of liquid drops in the emulsion, and the formation of water drop chains is prevented by forming electric convection in the emulsion, namely, the secondary splitting of the water drops is prevented, and the emulsion breaking efficiency is greatly improved. Meanwhile, the corona discharge demulsification is applied to the regeneration of the turbine oil, so that the separation of the turbine oil and water can be better realized, and the regeneration effect is improved. Based on the above, the invention is created.
<Demulsification method>
The emulsion breaking method of the emulsion, which is implemented corona discharge on the periphery of the emulsion to be broken, is a dispersion system containing water.
Aqueous dispersions are understood here to mean dispersions or dispersions in which water is used as the dispersing medium. The water content may be 5% or more, preferably 5 to 95%.
As for the non-aqueous component of the emulsion, its polarity or dielectric constant is not strictly limited with respect to the size of water. As an illustration, the non-aqueous component of the dispersion is a fat, preferably olive oil or the like.
Here, the periphery of the emulsion is understood to mean that the corona generation is located at the periphery of the emulsion, i.e. at the level of the non-emulsion or inside the non-emulsion.
As a suitable but non-limiting distance of the periphery, the corona discharge is at a distance of 10mm to 30mm from the surface of the emulsion.
Suitably, but not limitatively, the voltage of the corona discharge is 20KV or less. Such as 3KV, 5KV, 10KV, 15KV, 18KV or 20KV, etc.
<Applications of>
The demulsification method can be applied to the regeneration of turbine oil.
Specifically, the specific process for regenerating the turbine oil comprises the following steps:
forming an emulsion of the turbine oil to be treated;
and demulsifying the emulsion, and separating the liquid to obtain the regenerated engine oil.
As for the subsequent liquid separation, drying after the liquid separation, and the like, both can be applied to the conventional manner.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
FIG. 1 is a diagram showing the state of emulsions before treatment in example 1 and comparative example 1 of the present application.
FIG. 2 is a graph showing the condition of the emulsion of example 1 of the present application after the treatment and that of comparative example 1.
FIG. 3 is a graph showing the condition of the emulsion after the treatment in comparative example 2 of the present application.
FIG. 4 is a schematic structural diagram of an implementation device of the demulsification method.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
< means for carrying out demulsification method >
Referring to fig. 4, the apparatus includes: a needle-tip electrode 1; the demulsification tank 4 is a rectangular acrylic container with a hollow upper part, and the left side and the right side of the demulsification tank are symmetrically provided with an oil inlet 3 and an oil outlet 5; the waste oil tank 2 is used for storing the emulsion and reaches the demulsification tank through an oil inlet; the treated emulsion enters the recovery oil tank 6 through the oil outlet 5; a waste liquid tank 8, the bottom of which is made of a copper plate 9, is integrated with the demulsification tank 4 into a whole and is arranged up and down, and the middle of the waste liquid tank is separated by a detachable copper baffle 7; the waste liquid tank 5, into which the water and other impurities in the emulsion are collected.
The water drops settle and stay in a waste liquid tank 8 at the bottom of the container, a baffle 7 is inserted to separate the waste liquid tank, impurities in the waste liquid tank are discharged through a sewage discharge outlet 10, and then the sewage discharge outlet is closed; and in the treatment process, the separated oil is stored in a recovery oil tank through an oil outlet, and then the baffle is taken out to continue oil-water separation.
<Procedure of the example>
Example 1
(deionized water and olive oil emulsion)
The emulsion is prepared from deionized water and olive oil, and the water content in the emulsion is 5 wt%.
20ml of the emulsion is placed in two acrylic containers respectively, and deionized water is dyed so as to observe the demulsification phenomenon. By adopting the device, the distance between the needle tip electrode and the liquid level of the emulsion is set to be 20mm, and the voltage of corona discharge is set to be 5 kV. And after the discharge time is 10min, observing the dispersion state of the deionized water.
Example 2
The only difference from the example is that the emulsion is deionized water, petroleum ether, and the rest is the same as the example 1.
Comparative example 1
The emulsion of example 1 without any tape discharge treatment.
Comparative example 2
The emulsion of example 1 was broken using an electrostatic field, the voltage applied at the electrostatic field being 20 KV. After being electrified for 10min, the dispersion state of water is observed.
< evaluation >
1. Evaluation procedure
The dispersion state of deionized water of example 1, comparative example 1 and comparative example 2 was observed, as shown in fig. 1.
2. Evaluation results
As shown in fig. 1 and 2, the left side of fig. 1 and 2 shows example 1, and the right side shows comparative example 1. As can be seen from the figure, the phenomenon of obvious demulsification and stratification occurs by using corona treatment.
FIG. 3 shows the state of the emulsion after the electrostatic field was applied in comparative example 2. As can be seen from the figure, the emulsion does not have obvious demulsification and delamination in the whole body but has water drop chains in local parts by adopting the electrostatic field treatment. The voltage of the electrostatic field of comparative example 2 is higher than that of example 1, which sufficiently indicates that it is difficult to apply the electrostatic field to the emulsion having a low water content even if the voltage is increased.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (6)
1. A method for breaking emulsion is characterized in that corona discharge is applied to the periphery of the emulsion to be broken, and the emulsion is an aqueous dispersion system.
2. The demulsification method as claimed in claim 1, wherein the voltage of the corona discharge is below 20 KV.
3. The demulsification method as claimed in claim 1, wherein the distance between the corona discharge and the liquid surface of the emulsion is 10 mm-30 mm.
4. The demulsification method as claimed in claim 1, wherein the non-aqueous component of the dispersion is grease.
5. The use of the demulsification method as claimed in any one of claims 1 to 4, which is used for the regeneration of turbine oil.
6. The use according to claim 5, wherein the specific process of the turbine oil regeneration comprises:
forming the turbine oil to be treated into emulsion;
and demulsifying the emulsion, and separating the liquid to obtain the regenerated engine oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210417801.2A CN114681956A (en) | 2022-04-20 | 2022-04-20 | Emulsion breaking method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210417801.2A CN114681956A (en) | 2022-04-20 | 2022-04-20 | Emulsion breaking method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114681956A true CN114681956A (en) | 2022-07-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210417801.2A Pending CN114681956A (en) | 2022-04-20 | 2022-04-20 | Emulsion breaking method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114681956A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB916757A (en) * | 1960-10-05 | 1963-01-30 | Carpco Kewanee Inc | Treatment of liquids with corona wind discharge |
| SU1533726A1 (en) * | 1987-11-20 | 1990-01-07 | Государственный Научно-Исследовательский И Проектный Институт Нефтяной И Газовой Промышленности Им.В.А.Муравленко | Electric dehydrator |
| CN102230641A (en) * | 2011-04-19 | 2011-11-02 | 何宗彦 | Recovery and purification method and device for oil fume |
| US20140360880A1 (en) * | 2013-04-16 | 2014-12-11 | Massachusetts Institute Of Technology | Systems and methods for unipolar separation of emulsions and other mixtures |
-
2022
- 2022-04-20 CN CN202210417801.2A patent/CN114681956A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB916757A (en) * | 1960-10-05 | 1963-01-30 | Carpco Kewanee Inc | Treatment of liquids with corona wind discharge |
| SU1533726A1 (en) * | 1987-11-20 | 1990-01-07 | Государственный Научно-Исследовательский И Проектный Институт Нефтяной И Газовой Промышленности Им.В.А.Муравленко | Electric dehydrator |
| CN102230641A (en) * | 2011-04-19 | 2011-11-02 | 何宗彦 | Recovery and purification method and device for oil fume |
| US20140360880A1 (en) * | 2013-04-16 | 2014-12-11 | Massachusetts Institute Of Technology | Systems and methods for unipolar separation of emulsions and other mixtures |
| CN105555412A (en) * | 2013-04-16 | 2016-05-04 | 麻省理工学院 | System and method for unipolar separation of emulsions and other mixtures |
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Application publication date: 20220701 |