CN114702977A - Method for treating oil sludge difficult to treat in electric desalting tank of petrochemical enterprise - Google Patents
Method for treating oil sludge difficult to treat in electric desalting tank of petrochemical enterprise Download PDFInfo
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- CN114702977A CN114702977A CN202210312124.8A CN202210312124A CN114702977A CN 114702977 A CN114702977 A CN 114702977A CN 202210312124 A CN202210312124 A CN 202210312124A CN 114702977 A CN114702977 A CN 114702977A
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- oil sludge
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- electric desalting
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- 239000010802 sludge Substances 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000011033 desalting Methods 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000003756 stirring Methods 0.000 claims abstract description 28
- 239000003599 detergent Substances 0.000 claims abstract description 25
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 22
- 150000001875 compounds Chemical class 0.000 claims abstract description 22
- 239000010452 phosphate Substances 0.000 claims abstract description 22
- KFZMGEQAYNKOFK-UHFFFAOYSA-N isopropyl alcohol Natural products CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims abstract description 20
- -1 isopropanol amide Chemical class 0.000 claims abstract description 18
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 17
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical compound CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000005119 centrifugation Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000004062 sedimentation Methods 0.000 claims abstract description 3
- OOCCDEMITAIZTP-QPJJXVBHSA-N (E)-cinnamyl alcohol Chemical compound OC\C=C\C1=CC=CC=C1 OOCCDEMITAIZTP-QPJJXVBHSA-N 0.000 claims description 12
- OOCCDEMITAIZTP-UHFFFAOYSA-N allylic benzylic alcohol Natural products OCC=CC1=CC=CC=C1 OOCCDEMITAIZTP-UHFFFAOYSA-N 0.000 claims description 7
- 239000003921 oil Substances 0.000 abstract description 78
- 238000000926 separation method Methods 0.000 abstract description 9
- 239000002245 particle Substances 0.000 description 7
- 239000010779 crude oil Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000002920 hazardous waste Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000011499 joint compound Substances 0.000 description 3
- 238000005191 phase separation Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
Abstract
The invention discloses a method for treating oil sludge which is difficult to treat in an electric desalting tank of a petrochemical enterprise, which comprises the following steps: s01, mixing and stirring the oil sludge, the demulsifier and the water, and heating to a certain temperature; s02, adding a compound detergent into the solution, wherein the compound detergent comprises lauryl alcohol phosphate and isopropanol amide, and continuously stirring for a period of time; s03, adding polyaluminum chloride into the solution, normally stirring for a period of time, and separating by a centrifuge; and S04, stopping centrifugation, and standing for sedimentation. The method for treating the oil sludge which is difficult to treat in the electric desalting tank of the petrochemical enterprise can effectively promote the water separation combined with the oil sludge and realize the separation of oil, water and sludge.
Description
Technical Field
The invention relates to a method for treating oil sludge which is difficult to treat in an electric desalting tank of a petrochemical enterprise, and belongs to the technical field of oil sludge treatment.
Background
The oil sludge is brown viscous milky liquid with certain peculiar smell. Generally consists of oil-in-water, water-in-oil, suspended solid impurities and petrochemical residual medicaments, and is an extremely stable suspended emulsion. The prior method for treating the oil sludge mainly comprises the following steps: pyrolysis/thermal desorption method, incineration method, biological treatment method, solvent extraction method, aqueous phase tempering-ultrasonic cavitation-centrifugation method and the like. But the pyrolysis/thermal desorption method and the solvent extraction method have high cost, the biological treatment method has long treatment period and incomplete treatment, the burning method can not recover oil products, the water phase quenching and tempering-ultrasonic cavitation-centrifugal method has poor three-phase separation effect, and the dehydrated solid has high water content.
Crude oil is refined in an electric desalting tank to remove salt from the crude oil, which produces a large amount of viscous sludge. The oil sludge is different from common tank bottom oil sludge, and the oil sludge contains more heavy oil and has high viscosity. Mainly in recent years, along with the gradual deterioration of crude oil properties and the increase of crude oil types, the salt content, the density, the viscosity and the like of crude oil are continuously increased, great influence and test are brought to the electric desalting operation, and the electric desalting back-flushing system of some refining enterprises cannot well remove oil sludge, so that a large amount of viscous oil sludge which is difficult to treat is generated. At present, various enterprises of the oil sludge mainly treat outsourcing hazardous waste, can not recover oil and has high treatment price of the hazardous waste.
The main reasons for the difficulty in dewatering such difficult-to-treat sludge are: the stability is good, and the water is difficult to evaporate. Since sludge is generally composed of oil-in-water, water-in-oil emulsions, where water and oil form very stable hydrates. (hydrate: complex formed by water combined with molecules of substance in the form of water molecules) ②good dispersibility and difficult compression of water. Because the oily sludge particles are generally charged, the particles are mutually exclusive, and the dispersibility of the oily sludge particles is good.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for treating oil sludge which is difficult to treat in an electric desalting tank of a petrochemical enterprise, which can effectively promote the water separation combined with the oil sludge and realize the separation of oil, water and sludge.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for treating oil sludge which is difficult to treat in an electric desalting tank of a petrochemical enterprise comprises the following steps:
s01, mixing and stirring the oil sludge, the demulsifier and the water, and heating to a certain temperature;
s02, adding a compound detergent into the solution, wherein the compound detergent comprises lauryl alcohol phosphate and isopropanol amide, and continuously stirring for a period of time;
s03, adding polyaluminum chloride into the solution, normally stirring for a period of time, and separating by a centrifuge;
and S04, stopping centrifugation, and standing for sedimentation.
In S01, according to the volume ratio, the oil sludge: a demulsifier: the water is 125: 1-2: 300, and the heating temperature is 50-70 ℃.
The demulsifier model is SP 169.
In S02, the volume ratio of the compound detergent to the oil sludge is 50-70: 1.
In S02, the volume ratio of the cinnamyl alcohol phosphate to the isopropanolamide is as follows: lauryl alcohol phosphate ester: isopropyl alcohol amide: water 1:1: 8.
And in S02, continuously stirring for 10-20 minutes.
In S03, the mass ratio of the polyaluminium chloride to the oil sludge is 1: 120-180.
In S03, the stirring time is 10 minutes, and the centrifuge rotation speed is 3000 rpm.
The invention has the beneficial effects that: the method for treating the oil sludge which is difficult to treat in the electric desalting tank of the petrochemical enterprise can relatively quickly treat the oil sludge which is difficult to treat, does not need to use an organic solvent, saves the cost, and adopts a compound detergent to wash the demulsified oil sludge, wherein the compound detergent comprises lauryl alcohol phosphate and isopropanol amide, the lauryl alcohol phosphate is a nonionic surfactant, has good hydrophilicity, detergency and conductivity, is a good cleaning agent, and the isopropanol amide is easy to dissolve in water, has good permeability and strong dispersibility of dirt particles. Because both the components have good hydrophilicity, after the components are compounded, the superstrong decontamination performance of the lauryl alcohol phosphate is combined with the strong permeability and the dispersibility of the isopropyl alcohol amide to generate a synergistic effect, so that the composite is very suitable for treating complex mixtures with complex components, liquid-solid mixing and better combination of water molecules and mixed particles in oil sludge. The two are compounded to be used after demulsification at 50-70 ℃, the demulsification effect can be promoted, water molecules and oil stain particles are promoted to be separated, the viscosity of oil sludge is reduced, the particles are cleaned by removing oil stains strongly, and conditions are created for subsequent oil, water and sludge three-phase separation.
Drawings
FIG. 1 is a diagram of the initial sludge of the present invention;
FIG. 2 is a diagram showing the three-phase separation of oil and cement treated by the method of the present invention;
FIG. 3 is a diagram of the upper oil layer obtained by the treatment according to the invention;
FIG. 4 is a lower layer mud pattern obtained by the treatment of the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings, and the following examples are only used to illustrate the technical solutions of the invention more clearly, and should not be taken as limiting the scope of the invention.
Detailed description of the preferred embodiment 1
The invention discloses a method for treating oil sludge difficult to treat in an electric desalting tank of a petrochemical enterprise, which comprises the following steps:
step one, mixing and stirring oil sludge, a demulsifier and water, and heating to a certain temperature. According to volume ratio, oil sludge: a demulsifier: water 125:1:300, heating temperature 70 ℃. The demulsifier model is SP 169.
And step two, adding a compound detergent into the solution, wherein the compound detergent comprises lauryl alcohol phosphate and isopropanolamide, and continuously stirring for a period of time. The volume ratio of the compound detergent to the oil sludge is 50: 1. The volume ratio of the cinnamyl alcohol phosphate to the isopropanolamide is as follows: lauryl alcohol phosphate ester: isopropyl alcohol amide: water 1:1: 8. Stirring was continued for 20 minutes.
And step three, adding polyaluminium chloride into the solution, normally stirring for a period of time, and separating by a centrifuge. The mass ratio of the polyaluminium chloride to the oil sludge is 1: 120. the stirring time was 10 minutes and the centrifuge speed was 3000 rpm.
And step four, stopping centrifugation, standing and settling to realize separation of oil, water and mud.
Specific example 2
The invention discloses a method for treating oil sludge difficult to treat in an electric desalting tank of a petrochemical enterprise, which comprises the following steps:
step one, mixing and stirring oil sludge, a demulsifier and water, and heating to a certain temperature. According to volume ratio, oil sludge: a demulsifier: water 125:2:300, heating temperature 50 ℃. The demulsifier model is SP 169.
And step two, adding a compound detergent into the solution, wherein the compound detergent comprises lauryl alcohol phosphate and isopropanolamide, and continuously stirring for a period of time. The volume ratio of the compound detergent to the oil sludge is 70: 1. The volume ratio of the cinnamyl alcohol phosphate to the isopropanolamide is as follows: lauryl alcohol phosphate ester: isopropyl alcohol amide: water 1:1: 8. The stirring time was continued for 10 minutes.
And step three, adding polyaluminium chloride into the solution, normally stirring for a period of time, and separating by a centrifuge. The mass ratio of the polyaluminium chloride to the oil sludge is 1: 180. the stirring time was 10 minutes and the centrifuge speed was 3000 rpm.
And step four, stopping centrifugation, standing and settling to realize separation of oil, water and mud.
Specific example 3
The invention discloses a method for treating oil sludge difficult to treat in an electric desalting tank of a petrochemical enterprise, which comprises the following steps:
step one, mixing and stirring oil sludge, a demulsifier and water, and heating to a certain temperature. According to volume ratio, oil sludge: a demulsifier: water 125:1.5:300, heating temperature 60 ℃. The demulsifier model is SP 169.
And step two, adding a compound detergent into the solution, wherein the compound detergent comprises lauryl alcohol phosphate and isopropanol amide, and continuously stirring for a period of time. The volume ratio of the compound detergent to the oil sludge is 60: 1. The volume ratio of the cinnamyl alcohol phosphate to the isopropanolamide is as follows: lauryl alcohol phosphate ester: isopropyl alcohol amide: water 1:1: 8. Stirring was continued for 15 minutes.
And step three, adding polyaluminum chloride into the solution, normally stirring for a period of time, and separating by a centrifuge. The mass ratio of the polyaluminium chloride to the oil sludge is 1: 150. the stirring time was 10 minutes and the centrifuge speed was 3000 rpm.
And step four, stopping centrifugation, standing and settling to realize separation of oil, water and mud.
Comparative example 1
This example is the same as example 3, except that the built detergent was replaced with the sole cinnamic alcohol phosphate, the volume ratio of cinnamic alcohol phosphate to water was 2: 8.
Comparative example 2
This example is the same as specific example 3, except that the built detergent was replaced with isopropanolamide alone, with a 2:8 ratio by volume of isopropanolamide to water.
The methods of the specific example 3, the comparative example 1 and the comparative example 2 are respectively used for treating the electric desalting tank oil sludge of a petrochemical and chemical refining enterprise, the photo of the electric desalting tank oil sludge before treatment is shown in figure 1, the characteristics of the electric desalting tank oil sludge are shown in table 1, and the effects after treatment are shown in table 2.
TABLE 1 oil sludge characteristics of electric desalting tank of petrochemical and chemical enterprises
| Water content (%) | Oil content (%) | Solid content (%) | pH | |
| Electric desalting tank oil sludge | 40.8 | 53.9 | 5.3 | 7.1 |
TABLE 2 comparison of different detergents after treatment
As can be seen from Table 2, by using the compound detergent of the present invention, the water content of the upper layer oil of the treated oil sludge is 1.5%, the solid content is 1.2%, the water content of the lower layer sludge of the treated oil sludge is 75.3%, the oil content is 4.8%, and the oil content in the dehydrated water is only 292mg/L, which shows that the separation of the oil, the water and the sludge is good, and the specific effect graph is shown in FIGS. 2 to 4. In addition, as can be seen from table 2, the compound detergent has better sludge treatment effect than the compound detergent using single lauryl alcohol phosphate or isopropyl alcohol amide.
The method for treating the oil sludge which is difficult to treat in the electric desalting tank of the petrochemical enterprise can effectively promote the water separation combined with the oil sludge, reduce the point charge of the oil sludge, recover the oil product and ensure that the reduction of the oil sludge (the calculation mode of the reduction of the oil sludge is (initial oil sludge amount-residual mud cake)/initial oil sludge amount) reaches more than 80 percent. The treated oil can be recycled, water enters a sewage treatment plant for treatment, and mud can be treated as hazardous waste, so that the purpose of reducing a large amount of waste is realized, and the economy is saved for subsequent hazardous waste treatment.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention.
Claims (8)
1. A method for treating oil sludge difficult to treat in an electric desalting tank of a petrochemical enterprise is characterized by comprising the following steps: the method comprises the following steps:
s01, mixing and stirring the oil sludge, the demulsifier and the water, and heating to a certain temperature;
s02, adding a compound detergent into the solution, wherein the compound detergent comprises lauryl alcohol phosphate and isopropanol amide, and continuously stirring for a period of time;
s03, adding polyaluminum chloride into the solution, normally stirring for a period of time, and separating by a centrifuge;
and S04, stopping centrifugation, and standing for sedimentation.
2. The method for treating the oil sludge difficult to treat in the electric desalting tank of the petrochemical enterprise according to claim 1, wherein the method comprises the following steps: in S01, according to the volume ratio, the oil sludge: a demulsifier: the water is 125: 1-2: 300, and the heating temperature is 50-70 ℃.
3. The method for treating the oil sludge difficult to treat in the electric desalting tank of the petrochemical enterprise according to claim 1, wherein the method comprises the following steps: the demulsifier model is SP 169.
4. The method for treating the oil sludge difficult to treat in the electric desalting tank of the petrochemical enterprise according to claim 1, wherein the method comprises the following steps: in S02, the volume ratio of the compound detergent to the oil sludge is 50-70: 1.
5. The method for treating the oil sludge difficult to treat in the electric desalting tank of the petrochemical enterprise according to claim 1, wherein the method comprises the following steps: in S02, the volume ratio of the cinnamyl alcohol phosphate to the isopropanolamide is as follows: lauryl alcohol phosphate ester: isopropyl alcohol amide: water 1:1: 8.
6. The method for treating the oil sludge difficult to treat in the electric desalting tank of the petrochemical enterprise according to claim 1, wherein the method comprises the following steps: and in S02, continuously stirring for 10-20 minutes.
7. The method for treating the oil sludge difficult to treat in the electric desalting tank of the petrochemical enterprise according to claim 1, wherein the method comprises the following steps: in S03, the mass ratio of the polyaluminium chloride to the oil sludge is 1: 120-180.
8. The method for treating the oil sludge difficult to treat in the electric desalting tank of the petrochemical enterprise according to claim 1, wherein the method comprises the following steps: in S03, the stirring time is 10 minutes, and the centrifuge rotation speed is 3000 rpm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210312124.8A CN114702977B (en) | 2022-03-28 | 2022-03-28 | Method for treating difficult-to-treat oil sludge in petrochemical enterprise electric desalting tank |
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| CN202210312124.8A CN114702977B (en) | 2022-03-28 | 2022-03-28 | Method for treating difficult-to-treat oil sludge in petrochemical enterprise electric desalting tank |
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Cited By (1)
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| CN116672873A (en) * | 2023-07-15 | 2023-09-01 | 辛集市九元化工有限责任公司 | Efficient environment-friendly formaldehyde scavenger and preparation method thereof |
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| CN116672873B (en) * | 2023-07-15 | 2024-01-09 | 辛集市九元化工有限责任公司 | Efficient environment-friendly formaldehyde scavenger and preparation method thereof |
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