An oil sludge separating agent and an oil sludge separating method

Abstract

The application belongs to the technical field of oil sludge separating agents, and specifically provides an oil sludge separating agent and an oil sludge separating method, and the preparation steps include the following: taking propylene glycol block polyether, a coagulant and an oil capturing agent, stirring, and obtaining; the preparation steps of the oil capturing agent include the following: S01. Taking polycaprolactone, adding acetone to heat and disperse to obtain A liquid; S02. Taking hydroxypropyl-beta-cyclodextrin and propyl gallate, heating, adding water and stirring, then adjusting pH, adding ethylenediamine disuccinic acid, and continuing to stir to obtain B liquid; S03. Dropping A liquid into B liquid, maintaining stirring until mixing is complete, and then rotary evaporation to collect solid components to obtain. After the oil sludge is treated by the oil sludge separating agent and the separating method, the total oil removal rate of the oil sludge is greater than or equal to 92.5%.

Description

Technical Field

[0001] This application belongs to the field of oil sludge separation agent technology, and in particular relates to an oil sludge separation agent and an oil sludge separation method. Background Technology

[0002] Oily sludge (oil sludge) is a major waste product of the petroleum industry, generated during the extraction, storage, transportation, and refining processes. It is a stable suspension emulsion system composed of crude oil (alkanes, aromatics, gums, asphaltenes), water, mud and sand, and chemical agents. After treatment, it can be used to extract crude oil.

[0003] In the field of oil sludge treatment technology, the "conditioning-mechanical separation" process has become the mainstream technology due to its advantages such as controllable operation and relatively high processing efficiency. The core principle of this technology is as follows: First, the highly stable oil sludge emulsion system is conditioned by adding demulsifiers and coagulants to disrupt its stable oil-water-solid three-phase structure. Then, the oil, water, and sludge phases are rapidly separated by the strong shearing or squeezing action of centrifugation, filter press, etc.

[0004] In existing conditioning technology systems, demulsifiers are usually propylene glycol block polyether copolymers, while coagulants are mostly inorganic-organic composite systems such as polyacrylamide (PAM) and polyaluminum chloride (PAC) and polyaluminum sulfate (PAS). Through the charge neutralization effect of organic / inorganic components and flocculation, destabilized fine particles are aggregated into large flocs that are easy to settle.

[0005] However, this process often fails to achieve the expected deoiling effect when treating oily sludge with high liquid content. The crude oil droplets released after demulsification have extremely high interfacial energy. Under the strong shear force generated during mechanical separation and the induction of residual charges on the surface of solid particles, these droplets are prone to secondary adsorption, re-attaching to the surface of mud and sand particles or embedding themselves inside flocs, forming a difficult-to-remove coating layer. This reverse emulsification or secondary pollution phenomenon directly leads to a large amount of crude oil components remaining in the solid filter residue, ultimately resulting in a technical bottleneck of low oil phase resource recovery rate and high residual oil content in the filter residue, which restricts the economic efficiency and practicality of the process. Therefore, there is a need to provide an oily sludge separating agent and an oily sludge separation method that can improve the oil deoiling rate. Summary of the Invention

[0006] To address the aforementioned problems and further improve the oil removal effect of the separating agent on oily sludge and reduce the oil content of the sludge, this application provides an oily sludge separating agent and an oily sludge separation method.

[0007] This application first provides an oil sludge separator, the preparation steps of which include the following:

[0008] Mix propylene glycol block polyether, coagulant and oil catcher, and stir to obtain the product;

[0009] The mass ratio of the propylene glycol block polyether, coagulant, and oil catcher used is (6-10):2:(0.3-0.5);

[0010] The coagulant is obtained by mixing polyacrylamide and polyaluminum chloride in a mass ratio of (1-1.5):1;

[0011] The preparation steps of the oil trap include the following:

[0012] S01. Take polycaprolactone, add acetone and heat to disperse to obtain solution A;

[0013] S02. Take hydroxypropyl-β-cyclodextrin and propyl gallate, heat and add water while stirring, then add ethylenediamine disuccinic acid and continue stirring to obtain solution B;

[0014] S03. Add liquid A dropwise to liquid B while stirring until completely mixed, then evaporate by rotary evaporation and collect the solid component to obtain the product;

[0015] The coagulant is obtained by mixing polyacrylamide and polyaluminum chloride in a mass ratio of (1-1.5):1.

[0016] Furthermore, in step S01, the mass-to-volume ratio of polycaprolactone to acetone is (0.5-1.3) g:(5-8) mL.

[0017] Furthermore, in step S02, the mass-to-volume ratio of hydroxypropyl-β-cyclodextrin, propyl gallate, water, and ethylenediamine disuccinic acid is (2.1-2.8)g:(1-1.5)g:(100-200)mL:(0.8-1.2)g; and the pH is adjusted to 7.2-7.7.

[0018] By adopting the above technical solution, hydroxypropyl-β-cyclodextrin and propyl gallate are dispersed in an aqueous solution. The hydrophobic propyl gallate is encapsulated in the cavity of hydroxypropyl-β-cyclodextrin. Subsequently, ethylenediamine disuccinic acid is added. Under alkaline pH conditions, its carboxyl groups are deprotonated and form hydrogen bonds with the hydroxyl groups on the surface of hydroxypropyl-β-cyclodextrin, finally obtaining a ternary composite structure. When mixed with subsequent demulsifying and coagulating components, this structure can promote the separation of crude oil from sludge and promote the aggregation of crude oil droplets, thereby improving the deoiling effect.

[0019] Furthermore, in step S03, the droplet acceleration of liquid A is 1.2-1.5 mL / min; the volume ratio of liquid A to liquid B is 1:(3-4).

[0020] This application also provides a method for separating oil sludge, the preparation steps of which include the following:

[0021] Take oil sludge, place it in a conditioning tank, then add oil sludge separating agent, heat and stir, then centrifuge, and then filter press to obtain filter cake and oil-containing filtrate; the oil sludge separating agent is the oil sludge separating agent prepared by the above preparation steps.

[0022] Furthermore, the amount of the sludge separator added is 0.1%-0.3% of the sludge mass.

[0023] Furthermore, the heating and stirring process is set at a temperature of 60-80℃ and a stirring time of 0.5-1h.

[0024] Furthermore, the centrifugation setting is a centrifugation speed of 10000-12000 r / min.

[0025] Compared with the prior art, this application has the following beneficial effects:

[0026] 1. This application prepares an oil trapping agent. Propyl gallate, encapsulated by hydroxypropyl-β-cyclodextrin, is released from the cyclodextrin cavity under conditioning conditions and interacts with exposed crude oil microspheres in oil sludge. Structurally, the pyrogallol groups interact with polycyclic aromatic hydrocarbons, colloids, and other components in the crude oil microspheres through π-π stacking and the formation of multiple hydrogen bonds, forming a coating layer on the surface of the oil droplets. This prevents the oil droplets from destabilizing and being destroyed and re-adsorbed by solid sludge components. The long alkyl chain structure of polycaprolactone can further adhere to the oil droplet clusters encapsulated by propyl gallate, and its flexible chain can shorten the distance between the oil droplets, promoting the coalescence and enrichment of crude oil droplets. Through the dual oil-locking structure, it promotes oil sludge separation and improves the oil removal effect.

[0027] 2. This application also introduces ethylenediamine disuccinic acid into the oil catcher to improve the stability of propyl gallate in oil sludge. Ethylenediamine disuccinic acid can bind to free metal ions in oil sludge through chelation. It forms a synergistic barrier with the cyclodextrin cavity structure, thereby improving the ability of propyl gallate to resist interference from metal ions in oil sludge and preventing the reduction of oil-locking effect of propyl gallate due to color reaction. Attached Figure Description

[0028] Figure 1 The results are the test results of the filtrate deoiling rate and filter residue residual oil rate of Examples 1-3 and Comparative Examples 1-2 of this application.

[0029] Figure 2 The results are the test results of the filtrate, solid residue oil quality and total oil removal rate of Examples 1-3 and Comparative Examples 1-2 of this application. Detailed Implementation

[0030] To make the inventive purpose, technical solution, and beneficial technical effects of this application clearer, the following detailed description of this application is provided in conjunction with embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] When using “including,” “having,” and “contains” as described herein, the intention is to cover non-exclusive inclusion, unless an explicit qualifying term such as “only,” “consisting of,” etc., is used, in which case another component may be added.

[0032] The terms "preferred," "more preferably," "better," and "even better" used in this application refer to embodiments of this application that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this application. That is, in this application, "preferred," "more preferably," "better," and "even better" are merely descriptions of implementations or embodiments with better effects, but do not constitute a limitation on the scope of protection of this application.

[0033] In this application, terms such as "further," "even more," and "particularly" are used for descriptive purposes and to indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0034] In this application, "at least one" means one or more, such as one, two, or more. "Multiple" or "several" means at least two, such as two, three, etc., and "multi-layered" means at least two layers, such as two layers, three layers, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0035] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0036] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, the method comprising steps (a) and (b) indicates that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0037] In this application, "above" or "below" includes the stated number. For example, "below 1" includes 1.

[0038] In this application, room temperature refers to 0~40℃, including but not limited to 10~40℃, or further to 20~30℃.

[0039] The present application will be further illustrated by the following examples, but these examples do not limit the scope of the present application.

[0040] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this application, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. All reagents or instruments whose manufacturers are not specified are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, based on the knowledge of the prior art possessed by one of ordinary skill in the art and the description in this application, any prior art methods, equipment, and materials similar to or equivalent to those described, used, or made by the methods, equipment, and materials in the embodiments of this application may be used to implement this application.

[0041] Example 1

[0042] In this embodiment, the preparation steps of the sludge separator are as follows:

[0043] S01. Take 0.5g of polycaprolactone, add 5mL of acetone, set the temperature to 40℃, set the stirring speed to 100r / min, and stir for 1h to obtain solution A;

[0044] S02. Mix 2.1g of hydroxypropyl-β-cyclodextrin and 1g of propyl gallate, set the temperature to 45℃, then add 100mL of deionized water, set the stirring speed to 100r / min, process for 10min, then adjust the pH to 7.2, add 0.8g of ethylenediamine disuccinic acid, and continue stirring for 5min to obtain solution B.

[0045] S03. Slowly add 10 mL of solution A to 30 mL of solution B at a rate of 1.2 mL / min, set the stirring speed to 100 r / min, and continue stirring for 2 h after the addition is complete. Then, evaporate the mixture by rotary evaporation and collect the solid fraction to obtain the oil catcher.

[0046] S04. Take 6g of propylene glycol block polyether (model: F-38), 1g of polyacrylamide, 1g of polyaluminum chloride and 0.3g of oil catcher, mix them, and continue stirring for 20min to obtain oil sludge separator.

[0047] In this embodiment, the oil sludge separation method is as follows:

[0048] 1) Conditioning treatment: 100 kg of high liquid content sludge (oil content 3.72%, solid content 9.3%, the remainder is water) is fed into the conditioning tank, and sludge separating agent is added at a rate of 0.1% of the total weight of the sludge. Then, the mixture is stirred at 60°C for 30 minutes to obtain the conditioned sludge.

[0049] 2) High-speed centrifugation: Transfer the prepared sludge to a sedimentation centrifuge and set the centrifugation speed to 10,000 r / min for centrifugation treatment to fully separate the crude oil, water and mud in the sludge.

[0050] 3) Filtration and dehydration: The mixture after centrifugation is sent to a filter press for solid-liquid separation to obtain filter cake and oily filtrate.

[0051] 4) Post-filtrate treatment: The oil filtrate is introduced into an oil-water separation tank for treatment. The upper layer is recovered to obtain filtrate oil, and the lower layer of wastewater enters the sewage treatment system for decontamination before being discharged.

[0052] 5) Post-processing of filter cake: After drying and dehydration, the filter cake is crushed to obtain filter residue, which is then transferred to a pyrolysis kiln for oxygen-free decomposition, and then sent to a calcining kiln for further calcination to obtain harmless slag. The gas phase is separated by a condensation system to obtain solid slag oil; the non-condensable vapor is purified by a washing system and then sent to a hot blast furnace for combustion to provide heat for the pyrolysis kiln. The pyrolysis tail gas is finally purified by a bag filter and a washing tower before being discharged into the atmosphere.

[0053] Example 2

[0054] In this embodiment, the preparation steps of the sludge separator are as follows:

[0055] S01. Take 1g of polycaprolactone, add 5mL of acetone, set the temperature to 45℃, set the stirring speed to 100r / min, and stir for 1h to obtain solution A.

[0056] S02. Mix 2.5g of hydroxypropyl-β-cyclodextrin and 1g of propyl gallate, set the temperature to 45℃, then add 150mL of deionized water, set the stirring speed to 150r / min, process for 30min, then adjust the pH to 7.5, add 0.8g of ethylenediamine disuccinic acid, and continue stirring for 10min to obtain solution B.

[0057] S03. Slowly add 10 mL of solution A to 35 mL of solution B at a rate of 1.3 mL / min, set the stirring speed to 100 r / min, and continue stirring for 2 h after the addition is complete. Then, evaporate the mixture by rotary evaporation and collect the solid fraction to obtain the oil catcher.

[0058] S04. Take 8g of propylene glycol block polyether (model: F-38), 1.2g of polyacrylamide, 0.8g of polyaluminum chloride and 0.4g of oil catcher, mix them, and continue stirring for 30min to obtain oil sludge separator.

[0059] In this embodiment, the oil sludge separation method is as follows:

[0060] 1) Conditioning treatment: 100 kg of high liquid content oil sludge (oil content 3.9%, solid impurity content 10.5%, the remainder being water) is fed into the conditioning tank, and oil sludge separating agent is added at a rate of 0.15% of the total weight of the oil sludge. Then, the mixture is stirred at 75°C for 45 minutes to obtain the conditioned oil sludge.

[0061] 2) High-speed centrifugation: Transfer the prepared sludge to a sedimentation centrifuge and set the centrifugation speed to 10,000 r / min for centrifugation treatment to fully separate the crude oil, water and mud in the sludge.

[0062] 3) Filtration and dehydration: The mixture after centrifugation is sent to a filter press for solid-liquid separation to obtain filter cake and oily filtrate.

[0063] 4) Post-filtrate treatment: The oil filtrate is introduced into an oil-water separation tank for treatment. The upper layer is recovered to obtain filtrate oil, and the lower layer of wastewater enters the sewage treatment system for decontamination before being discharged.

[0064] 5) Post-processing of filter cake: After drying and dehydration, the filter cake is crushed to obtain filter residue, which is then transferred to a pyrolysis kiln for oxygen-free decomposition, and then sent to a calcining kiln for further calcination to obtain harmless slag. The gas phase is separated by a condensation system to obtain solid slag oil; the non-condensable vapor is purified by a washing system and then sent to a hot blast furnace for combustion to provide heat for the pyrolysis kiln. The pyrolysis tail gas is finally purified by a bag filter and a washing tower before being discharged into the atmosphere.

[0065] Example 3

[0066] In this embodiment, the preparation steps of the sludge separator are as follows:

[0067] S01. Take 1.3g of polycaprolactone, add 8mL of acetone, set the temperature to 50℃, set the stirring speed to 200r / min, and stir for 2h to obtain solution A;

[0068] S02. Mix 2.8g of hydroxypropyl-β-cyclodextrin and 1.5g of propyl gallate, set the temperature to 45℃, then add 200mL of deionized water, set the stirring speed to 200r / min, process for 30min, then adjust the pH to 7.7, add 1.2g of ethylenediamine disuccinic acid, and continue stirring for 20min to obtain solution B.

[0069] S03. Slowly add 10 mL of solution A to 40 mL of solution B at a rate of 1.5 mL / min, set the stirring speed to 200 r / min, and continue stirring for 3 h after the addition is complete. Then, rotary evaporate the solution and collect the solid part to obtain the oil catcher.

[0070] S04. Take 10g of propylene glycol block polyether (model: F-38), 1g of polyacrylamide, 1g of polyaluminum chloride and 0.5g of oil catcher, mix them, and continue stirring for 30min to obtain oil sludge separator.

[0071] In this embodiment, the oil sludge separation method is as follows:

[0072] 1) Conditioning treatment: 100 kg of high liquid content oil sludge (oil content 4.23%, solid impurity content 9.7%, the remainder being water) is fed into a conditioning tank, and oil sludge separating agent is added at a rate of 0.3% of the total weight of the oil sludge. Then, the mixture is stirred at 80°C for 60 minutes to obtain conditioned oil sludge.

[0073] 2) High-speed centrifugation: Transfer the prepared sludge to a sedimentation centrifuge and set the centrifugation speed to 12000 r / min for centrifugation treatment to fully separate the crude oil, water and mud in the sludge.

[0074] 3) Filtration and dehydration: The mixture after centrifugation is sent to a filter press for solid-liquid separation to obtain filter cake and oily filtrate.

[0075] 4) Post-filtrate treatment: The oil filtrate is introduced into an oil-water separation tank for treatment. The upper layer is recovered to obtain filtrate oil, and the lower layer of wastewater enters the sewage treatment system for decontamination before being discharged.

[0076] 5) Post-processing of filter cake: After drying and dehydration, the filter cake is crushed to obtain filter residue, which is then transferred to a pyrolysis kiln for oxygen-free decomposition, and then sent to a calcining kiln for further calcination to obtain harmless slag. The gas phase is separated by a condensation system to obtain solid slag oil; the non-condensable vapor is purified by a washing system and then sent to a hot blast furnace for combustion to provide heat for the pyrolysis kiln. The pyrolysis tail gas is finally purified by a bag filter and a washing tower before being discharged into the atmosphere.

[0077] Comparative Example 1

[0078] The only difference between this comparative example and Example 1 is that the preparation steps of the sludge separator are as follows:

[0079] Mix 2.5g of hydroxypropyl-β-cyclodextrin and 1.2g of propyl gallate, set the temperature to 45℃, then add 150mL of deionized water, set the stirring speed to 200r / min, and process for 30min. Then adjust the pH to 7.7, add 0.8g of ethylenediamine disuccinic acid, and continue stirring for 20min to obtain the sludge separator.

[0080] In this comparative example, the high-liquid-content sludge had an oil content of 4.4%, a solid content of 9.7%, and the remainder was water.

[0081] The remaining steps are the same as in Example 1.

[0082] Comparative Example 2

[0083] The only difference between this comparative example and Example 1 is that the preparation steps of the sludge separator are as follows:

[0084] S01. Take 1.3g of polycaprolactone, add 5mL of acetone, set the temperature to 50℃, set the stirring speed to 100r / min, and stir for 1h to obtain solution A;

[0085] S02. Mix 2.2g of hydroxypropyl-β-cyclodextrin and 1g of propyl gallate, set the temperature to 35℃, then add 100mL of deionized water, set the stirring speed to 100r / min, process for 10min, then adjust the pH to 7.2, and continue stirring for 5min to obtain solution B.

[0086] S03. Slowly add 10 mL of solution A to 30 mL of solution B at a rate of 1.2 mL / min, set the stirring speed to 100 r / min, and continue stirring for 2 h after the addition is complete. Then, evaporate the mixture by rotary evaporation and collect the solid fraction to obtain the oil catcher.

[0087] S04. Take 6g of propylene glycol block polyether (model: F-38), 1g of polyacrylamide, 1g of polyaluminum chloride and 0.4g of oil catcher, mix them and continue stirring for 20min to obtain oil sludge separator.

[0088] In this comparative example, the high-liquid-content sludge had an oil content of 3.95%, a solid content of 10.2%, and the remainder was water.

[0089] The remaining steps are the same as in Example 1.

[0090] Performance testing

[0091] 1. Filtrate oil removal rate: Record the filtrate oil mass of Examples 1-3 and Comparative Examples 1-2. The filtrate oil removal rate (η) is calculated according to the following formula:

[0092]

[0093] in,

[0094] η: Oil removal rate of filtrate;

[0095] m: Mass of filtrate oil from Examples 1-3 and Comparative Examples 1-2;

[0096] M: Oil content of sludge in Examples 1-3 and Comparative Examples 1-2.

[0097] 2. Residual oil content of filter cake: Record the mass of solid residue oil in Examples 1-3 and Comparative Examples 1-2, as well as the corresponding filter cake mass. The residual oil content (D) of filter cake is calculated according to the following formula:

[0098]

[0099] in,

[0100] D: Residual oil content in filter residue;

[0101] n: Mass of solid residue oil from Examples 1-3 and Comparative Examples 1-2;

[0102] N: Filter cake mass of Examples 1-3 and Comparative Examples 1-2.

[0103] 3. Total oil removal rate: The total oil removal rate (W) is calculated according to the following formula:

[0104]

[0105] in,

[0106] W: Total oil removal rate;

[0107] m+n: Mass of oil extracted from Examples 1-3 and Comparative Examples 1-2;

[0108] M: Oil content of sludge in Examples 1-3 and Comparative Examples 1-2.

[0109] The test results for filtrate oil removal rate, filter residue residual oil rate, and total oil removal rate are as follows: Figures 1-2 As shown.

[0110] Take Examples 1-3 and Comparative Examples 1-2, and combine them with... Figures 1-2 It can be concluded that after treatment with the sludge separator of the embodiment, the residual oil rate of the filter residue is reduced and the oil removal rate of the sludge filtrate is improved. The sludge separator of the embodiment can promote the removal of oil molecules from the sludge system during the sludge treatment stage. In contrast, Comparative Example 1 lacks a macromolecular lipophilic structure that stabilizes oil and promotes coalescence, causing the oil molecules removed from the sludge system to be easily destabilized by the system and re-entered into the sludge phase, which has an adverse effect on the oil removal process. Comparative Example 2 is affected by the heterometallic ions in the sludge, causing gallic acid to partially lose its oil stabilizing effect due to the color reaction in the treatment environment, and the oil droplets also have destabilization problems, affecting the removal of crude oil. The test results show that the sludge separator of the embodiment has a good oil removal effect, with a total oil removal rate of ≥92.5%.

[0111] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An oil sludge separator, characterized in that, The preparation steps include the following: Mix propylene glycol block polyether, coagulant and oil catcher, and stir to obtain the product; The preparation steps of the oil trap include the following: S01. Take polycaprolactone, add acetone and heat to disperse to obtain solution A; S02. Take hydroxypropyl-β-cyclodextrin and propyl gallate, heat and add water while stirring, then add ethylenediamine disuccinic acid and continue stirring to obtain solution B; S03. Add liquid A dropwise to liquid B, keep stirring until completely mixed, then evaporate by rotary evaporation and collect the solid component.

2. The sludge separator according to claim 1, characterized in that, The mass ratio of the propylene glycol block polyether, coagulant and oil catcher used is (6-10):2:(0.3-0.5).

3. The sludge separator according to claim 1, characterized in that, The coagulant is obtained by mixing polyacrylamide and polyaluminum chloride in a mass ratio of (1-1.5):

1.

4. The sludge separator according to claim 1, characterized in that, In step S01, the mass-to-volume ratio of polycaprolactone to acetone used is (0.5-1.3) g:(5-8) mL.

5. The sludge separator according to claim 1, characterized in that, In step S02, the mass-to-volume ratio of hydroxypropyl-β-cyclodextrin, propyl gallate, water and ethylenediamine disuccinic acid is (2.1-2.8)g:(1-1.5)g:(100-200)mL:(0.8-1.2)g.

6. The sludge separator according to claim 1, characterized in that, In step S03, the droplet acceleration of liquid A is 1.2-1.5 mL / min; the volume ratio of liquid A to liquid B is 1:(3-4).

7. A method for separating oil sludge, characterized in that, The preparation steps include the following: Take oil sludge, place it in a conditioning tank, then add oil sludge separating agent, heat and stir, then centrifuge, and then filter press to obtain filter cake and oily filtrate; the oil sludge separating agent is the oil sludge separating agent according to any one of claims 1-6.

8. The method for separating oil sludge according to claim 7, characterized in that, The amount of the sludge separator added is 0.1%-0.3% of the sludge mass.

9. The method for separating oil sludge according to claim 7, characterized in that, The heating and stirring process is set at a temperature of 60-80℃ and stirred for 0.5-1 hour.

10. The method for separating oil sludge according to claim 7, characterized in that, The centrifuge is set to a centrifugation speed of 10000-12000 r / min.

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