An emulsion-type capsule slow-release oil sand dissociation agent, and a preparation method and application thereof

Abstract

The present application relates to a kind of emulsion type capsule slow-release oil sand dissociation agent and its preparation method and application, belong to oil sand pitch technical field.Dissociation agent is by the water phase flocculating agent solution of volume ratio (10~30) and the oil phase containing emulsifier mixed and formed water-in-oil emulsion;Water phase flocculating agent solution includes the flocculating agent of concentration 10~100 mg / L, and the oil phase containing emulsifier includes the emulsifier of volume concentration 1~4%.By oil outer phase, the viscosity of pitch and oil-water interfacial tension are reduced, the calcium and magnesium ion concentration in system can be reduced after slow release of flocculating agent solution, and then the adhesion between pitch and silicon surface is weakened, on the basis of reducing the dosage of flocculating agent, further improve the dissociation efficiency of pitch on sand surface.It can not change the pH of system, prevent the disadvantage that the hydrophobicity of pitch is reduced and the difficulty of pitch droplet coagulation is increased by hot lye.

Description

Technical Field

[0001] This invention belongs to the field of oil sands and bitumen technology, and relates to a dissociation agent for separating bitumen from oil sands and improving bitumen recovery rate. Specifically, it relates to an emulsion-type capsule slow-release oil sand dissociation agent, its preparation method and application. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Oil sands are an exploitable unconventional petroleum resource, a mixture of bitumen, sand, minerals, clay, and encapsulated water. Bitumen, the crude oil component of oil sands, is more viscous than conventional crude oil and is classified as extra-heavy oil. The bitumen in oil sands is characterized by high density, high viscosity, high carbon-to-hydrogen ratio, and high metal content. Oil sands dissociation is the process of separating bitumen from oil sands, primarily using water-based extraction technology, which is essentially a flotation process. The water-based dissociation process of oil sands generally takes place in a weakly alkaline hot water environment and mainly includes two key steps: first, the bitumen oil desorbs from the surface of solids such as sand grains; then, the desorbed bitumen oil droplets combine with injected air bubbles and float to the water surface to form bitumen foam. The agent that promotes desorption is called an oil sands dissociation agent.

[0004] In water-based dissociation processes, conventionally used hot alkaline dissociation agents lead to an increase in pH. As pH increases, the long-range repulsion at the asphalt interface increases while the hydrophobicity constant decreases, resulting in reduced hydrophobic attraction and consequently a sharp decrease in adhesion, thus reducing flotation efficiency. It also ionizes acidic groups on the asphalt surface, further reducing the attraction between asphalt particles and increasing the difficulty of asphalt droplet aggregation. Oil sands clay and coating water release calcium and magnesium ions into the dissociation system, and these ions are also present in the water used for water-based dissociation. With increasing calcium and magnesium ion concentration in the weakly alkaline solution, the long-range repulsion between asphalt and the silica surface is significantly weakened, while adhesion is enhanced. Therefore, the presence of divalent metal ions in the oil sands dissociation solution system is generally considered to have adverse effects. Furthermore, when montmorillonite is present in the oil sands dissociation extraction system, the bridging effect of calcium and magnesium ions increases the attraction between asphalt and montmorillonite, leading to clay particles encapsulating asphalt, which reduces asphalt recovery and flotation quality, and increases subsequent processing costs.

[0005] Therefore, how to obtain an oil sand dissociation agent that can reduce asphalt viscosity, complex calcium and magnesium ions, and break clay encapsulation without adjusting pH is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide an emulsion-type capsule-type sustained-release oil sand dissociator, its preparation method, and its application. An oil-in-water sustained-release emulsion-type oil sand dissociator is disclosed, which can significantly reduce the adverse effects of divalent calcium and magnesium ions, greatly improve bitumen recovery rate, and ultimately significantly enhance the flotation effect of oil sands.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] An emulsion-type capsule sustained-release oil sand dissociator is an oil-in-water emulsion formed by mixing an aqueous flocculant solution with a volume ratio of (10~30):(70~90) and an oil phase containing an emulsifier.

[0009] The aqueous phase flocculant solution includes flocculant at a concentration of 10-100 mg / L, and the emulsifier-containing oil phase includes emulsifier at a volume concentration of 1-4%.

[0010] Secondly, the present invention provides a method for preparing the above-mentioned emulsion-type capsule sustained-release oil sand dissociation agent:

[0011] A flocculant is dispersed in water to obtain an aqueous flocculant solution; an emulsifier is dispersed in an oil phase to obtain an oil phase containing an emulsifier; the aqueous flocculant solution and the oil phase containing an emulsifier are mixed to obtain a water-in-oil emulsion type capsule-type sustained-release oil sand dissociator.

[0012] Thirdly, the present invention provides the application of the above-mentioned emulsion-type capsule sustained-release oil sand dissociation agent in oil sand dissociation, comprising: mixing oil sand with the emulsion-type capsule sustained-release oil sand dissociation agent at a mass ratio of 1: (5~10), stirring, separating the upper liquid and the lower solid, and then separating asphalt from the upper liquid.

[0013] The beneficial effects of this invention are as follows:

[0014] This invention provides a water-in-oil emulsion-type capsule-type slow-release oil sand dissociation agent. By reducing the viscosity of asphalt and the interfacial tension between oil and water through the oil-external phase, it promotes the dissociation of asphalt and sand, thereby improving the flotation effect of oil sands. After the oil-external phase in the water-in-oil emulsion fuses with the asphalt to reduce viscosity, it releases a flocculant solution in the aqueous phase. The flocculant solution undergoes a complexation effect with divalent calcium and magnesium ions, which can significantly reduce the concentration of calcium and magnesium ions in the system, thereby weakening the adhesion between asphalt and the silica surface, enhancing the repulsion between them, and further improving the dissociation efficiency of asphalt on the sand surface. It does not change the pH of the system, avoiding the disadvantages of reduced asphalt hydrophobicity and increased difficulty in asphalt droplet coagulation caused by hot alkaline solutions.

[0015] In the application of this method in oil sands dissociation, the continuous oil phase preferentially fuses with the bitumen to reduce viscosity, creating conditions for desorption. The dispersed aqueous phase slowly releases the flocculant, which exerts a complexing effect, solving ion interference and reducing the amount of flocculant required. The synergistic effect of these two phases increases the oil sands dissociation rate to over 90%, which is more than 35% higher than that of traditional alkaline solutions (66.5%). Furthermore, no additional heating is required, making it environmentally friendly, energy-saving, and emission-reducing, resulting in significant economic benefits. Attached Figure Description

[0016] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0017] Figure 1 This is a schematic diagram of the emulsion preparation process in Example 1.

[0018] Figure 2 This is an optical microscope photograph of the emulsion from Example 1.

[0019] Figure 3 This is a statistical diagram of the particle size distribution of the emulsion in Example 1.

[0020] Figure 4 This is a statistical diagram of the particle size distribution of the emulsion in Example 2.

[0021] Figure 5 This is a statistical diagram of the particle size distribution of the emulsion in Example 3.

[0022] Figure 6 This is a statistical diagram of the particle size distribution of the emulsion in Example 4.

[0023] Figure 7 This is a statistical diagram of the particle size distribution of the emulsion in Example 5.

[0024] Figure 8 This is a statistical diagram of the particle size distribution of the emulsion in Example 6.

[0025] Figure 9 This is a statistical diagram of the particle size distribution of the emulsion in Example 7.

[0026] Figure 10 This is a statistical graph of the particle size distribution of the emulsion in Comparative Example 1. Detailed Implementation

[0027] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] Unless otherwise specified, the experimental methods described in the following examples are generally performed under standard conditions. All raw materials and reagents used in the following examples are commercially available unless otherwise indicated.

[0030] One or more embodiments of the present invention provide an emulsion-type capsule-type sustained-release oil sand dissociator, which is a water-in-oil emulsion formed by mixing an aqueous phase flocculant solution with a volume ratio of (10~30):(70~90) and an oil phase containing emulsifier; wherein the aqueous phase flocculant solution includes a flocculant concentration of 10~100mg / L, and the oil phase containing emulsifier includes an emulsifier with a volume concentration of 1~4%.

[0031] Among the above components, the oil-external phase reduces the viscosity of asphalt and the interfacial tension between oil and water, promoting the dissociation of asphalt and sand. After the oil-external phase and asphalt are fused together and the viscosity is reduced, the flocculant solution in the aqueous phase can be released. The flocculant solution has a complexation effect with calcium and magnesium divalent ions, which can reduce the concentration of calcium and magnesium ions in the system, thereby weakening the adhesion between asphalt and the silica surface, enhancing the repulsion between the two, and improving the dissociation efficiency of asphalt on the sand surface.

[0032] Optionally, the flocculant is an anionic polymer flocculant, a polyphosphate flocculant, or an aminocarboxylate flocculant; it can rapidly remove calcium and magnesium ions during the release of calcium and magnesium ions from oil sand clay and encapsulated water, and at the same time remove calcium and magnesium ions from the water contained in the dissociation agent, preventing a series of adverse effects caused by calcium and magnesium ions entering the dissociation system.

[0033] Optionally, the anionic polymeric flocculant includes one or more of sodium polyacrylate, partially hydrolyzed polyacrylamide, and polymethacrylic acid; the polyphosphate flocculant includes one or more of sodium tripolyphosphate and sodium hexametaphosphate; and the aminocarboxylic acid flocculant includes one or more of ethylenediaminetetraacetic acid (EDTA), aminotriacetic acid (NTA), and diethylenetriaminepentaacetic acid.

[0034] Optionally, the oil phase in the emulsifier-containing oil phase includes one or more of kerosene and oleic acid esters, wherein oleic acid esters are the main components of biodiesel; or, the oil phase in the emulsifier-containing oil phase includes biodiesel; it can preferentially fuse with asphalt as a continuous phase to reduce viscosity, creating conditions for desorption, and then release the aqueous phase, reducing the concentration of calcium and magnesium ions in the system and improving the dissociation efficiency of asphalt on the sand surface.

[0035] Optionally, the emulsifier is a fatty acid metal soap emulsifier, a sorbitan fatty acid ester emulsifier, or a glycerol ester emulsifier; these emulsifiers have low HLB values ​​(usually 3~6), which can reduce the oil-water interfacial tension and form a highly lipophilic interfacial film on the surface of small droplets in the aqueous phase, preventing droplet aggregation and thus achieving long-term emulsion stability.

[0036] Optionally, the fatty acid metal soap emulsifier includes one or more of calcium stearate, magnesium stearate, and aluminum stearate; the sorbitan fatty acid ester emulsifier includes one or more of Span-40, Span-60, Span-80, and Span-85; and the glycerol ester emulsifier is glycerol monostearate.

[0037] Optionally, the average droplet size of the aqueous phase in the water-in-oil emulsion is 3~20μm.

[0038] One or more embodiments of the present invention provide a method for preparing the above-mentioned emulsion-type capsule sustained-release oil sand dissociation agent, comprising the steps of:

[0039] A flocculant is dispersed in water to obtain an aqueous flocculant solution; an emulsifier is dispersed in an oil phase to obtain an oil phase containing an emulsifier; the aqueous flocculant solution and the oil phase containing an emulsifier are mixed to obtain a water-in-oil emulsion type capsule-type sustained-release oil sand dissociator.

[0040] In the above process, the flocculant is dissolved in water to prepare the aqueous phase, and the emulsifier is dispersed in the oil phase. The two are then mixed to form a stable water-in-oil emulsion.

[0041] Optionally, the method for dispersing the emulsifier in the oil phase is mechanical stirring, including stirring at a speed of 100~300 r / min for 10~15 min.

[0042] Optionally, the method of mixing the aqueous flocculant solution and the oil phase containing emulsifier includes high-speed shear dispersion emulsification to form a stable water-in-oil emulsion.

[0043] One or more embodiments of the present invention provide the application of the above-mentioned emulsion-type capsule sustained-release oil sand dissociation agent in oil sand dissociation, including: mixing oil sand with the emulsion-type capsule sustained-release oil sand dissociation agent at a mass ratio of 1: (5~10), stirring, separating the upper liquid and the lower solid, and then separating asphalt from the upper liquid.

[0044] In the above process, the oil phase continuous phase preferentially fuses with the asphalt to reduce viscosity, creating conditions for desorption; then the aqueous phase dispersed phase slowly releases the flocculant that exerts a complexing effect, continuously exerting a flocculation inhibition effect on calcium and magnesium ions and clay minerals, and is conducive to reducing the amount of aqueous phase flocculant used; the two work together to promote the dissociation of oil sands without the need for alkali solution or heating.

[0045] Optionally, the oil sands are mixed with the emulsion-type capsule sustained-release oil sand dissociation agent at a mass ratio of 1:5.

[0046] Optionally, the stirring method includes stirring at a speed of 300~500 r / min for 60~80 min.

[0047] The present invention will be further described below with reference to specific embodiments.

[0048] Example 1

[0049] An emulsion-type capsule-type sustained-release oil sand dissociator is composed of the following raw materials by volume percentage: 69% oil phase, 30% aqueous phase flocculant solution, and 1% emulsifier; wherein the oil phase is biodiesel, the aqueous phase is a 50 mg / L sodium polyacrylate aqueous solution, and the emulsifier is calcium stearate.

[0050] Preparation method as follows Figure 1 As shown, it includes:

[0051] Sodium polyacrylate was added to water and stirred at 300 r / min for 15 min until completely dissolved to obtain a sodium polyacrylate aqueous solution of the set concentration. Calcium stearate was added to biodiesel and stirred at 200 r / min for 10 min until completely dispersed to obtain an oil phase containing emulsifier (the oil phase containing emulsifier included an emulsifier with a volume concentration of 1.45%). The sodium polyacrylate aqueous solution and the oil phase containing emulsifier were mixed and then dispersed and emulsified using a high-shear dispersing emulsifier at a speed of 1500 r / min for 10 min to obtain an emulsion-type capsule-type sustained-release oil sand dissociator.

[0052] Electron optical microscopy observation of droplet morphology of water-in-oil slow-release emulsion type oilsand dissociation agent emulsion, such as... Figure 2 As shown, the particle size distribution test results are as follows: Figure 3 As shown, the average droplet size of the aqueous phase is 4–10 μm.

[0053] Example 2

[0054] An emulsion-type capsule sustained-release oil sand dissociator is composed of the following raw materials by volume percentage: 69% oil phase, 30% aqueous phase flocculant solution and 1% emulsifier; wherein the oil phase is biodiesel, the aqueous phase is a 50 mg / L sodium hexametaphosphate aqueous solution, and the emulsifier is calcium stearate.

[0055] Preparation methods include:

[0056] Sodium hexametaphosphate was added to water and stirred at 300 r / min for 15 min until completely dissolved to obtain an aqueous solution of sodium hexametaphosphate of the set concentration. Calcium stearate was added to biodiesel and stirred at 200 r / min for 10 min until completely dispersed to obtain an oil phase containing emulsifier. The aqueous solution of sodium hexametaphosphate and the oil phase containing emulsifier were mixed and then dispersed and emulsified using a high-shear dispersion emulsifier at a speed of 1500 r / min for 10 min to obtain an emulsion-type capsule-type sustained-release oil sand dissociator.

[0057] Electron optical microscopy revealed that the morphology of the water-in-oil slow-release emulsion-type oil sand dissociation agent emulsion was similar to that of Example 1. The particle size distribution test results are as follows: Figure 4 As shown, the average droplet size of the aqueous phase is 3–10 μm.

[0058] Example 3

[0059] An emulsion-type capsule-type sustained-release oil sand dissociator is composed of the following raw materials by volume percentage: 69% oil phase, 30% aqueous phase flocculant solution, and 1% emulsifier; wherein the oil phase is biodiesel, the aqueous phase is a 50 mg / L aqueous solution of diethylaminetetraacetic acid, and the emulsifier is calcium stearate.

[0060] Preparation methods include:

[0061] Diethylaminetetraacetic acid (DEA) was added to water and stirred at 300 r / min for 15 min until completely dissolved to obtain an aqueous solution of DEA at the set concentration. Calcium stearate was added to biodiesel and stirred at 200 r / min for 10 min until completely dispersed to obtain an oil phase containing emulsifier. The aqueous solution of DEA and the oil phase containing emulsifier were mixed and then dispersed and emulsified using a high-shear dispersing emulsifier at a speed of 1500 r / min for 10 min to obtain an emulsion-type capsule-type sustained-release oil sand dissociator.

[0062] Electron optical microscopy revealed that the morphology of the water-in-oil slow-release emulsion-type oil sand dissociation agent emulsion was similar to that of Example 1. The particle size distribution test results are as follows: Figure 5 As shown, the average droplet size of the aqueous phase is 6–15 μm.

[0063] Example 4

[0064] An emulsion-type capsule sustained-release oil sand dissociator is composed of the following raw materials by volume percentage: 69% oil phase, 30% aqueous phase flocculant solution, and 1% emulsifier; wherein the oil phase is kerosene, the aqueous phase is an aqueous solution of diethylaminetetraacetic acid with a concentration of 50 mg / L, and the emulsifier is calcium stearate.

[0065] Preparation methods include:

[0066] Diethylaminetetraacetic acid (DEA) was added to water and stirred at 300 r / min for 15 min until completely dissolved to obtain an aqueous solution of DEA at the set concentration. Calcium stearate was added to kerosene and stirred at 200 r / min for 10 min until completely dispersed to obtain an oil phase containing emulsifier. The aqueous solution of DEA and the oil phase containing emulsifier were mixed and then dispersed and emulsified using a high-shear dispersing emulsifier at 1500 r / min for 10 min to obtain an emulsion-type capsule-type sustained-release oil sand dissociator.

[0067] Electron optical microscopy revealed that the morphology of the water-in-oil slow-release emulsion-type oil sand dissociation agent emulsion was similar to that of Example 1. The particle size distribution test results are as follows: Figure 6 As shown, the average droplet size of the aqueous phase is 5–12 μm.

[0068] Example 5

[0069] An emulsion-type capsule sustained-release oil sand dissociator is composed of the following raw materials by volume percentage: 69% oil phase, 30% aqueous phase flocculant solution, and 1% emulsifier; wherein the oil phase is kerosene, the aqueous phase is a 50 mg / L diethylaminetetraacetic acid aqueous solution, and the emulsifier is sorbitan fatty acid ester Span-80.

[0070] Preparation methods include:

[0071] Diethylaminetetraacetic acid (DEA) was added to water and stirred at 300 r / min for 15 min until completely dissolved to obtain an aqueous solution of DEA at the set concentration. Sorbitan fatty acid ester Span-80 was added to kerosene and stirred at 200 r / min for 10 min until completely dispersed to obtain an oil phase containing emulsifier. The aqueous solution of DEA and the oil phase containing emulsifier were mixed and then dispersed and emulsified using a high-shear dispersing emulsifier at a speed of 1500 r / min for 10 min to obtain an emulsion-type capsule sustained-release oil sand dissociator.

[0072] Electron optical microscopy revealed that the morphology of the water-in-oil slow-release emulsion-type oil sand dissociation agent emulsion was similar to that of Example 1. The particle size distribution test results are as follows: Figure 7 As shown, the average droplet size of the aqueous phase is 6–18 μm.

[0073] Example 6

[0074] The difference between this embodiment and Example 5 is that the emulsion-type capsule sustained-release oil sand dissociation agent is composed of the following raw materials by volume percentage: 79% oil phase, 20% aqueous phase flocculant solution, and 1% emulsifier; the concentration of the aqueous phase flocculant solution is 10 mg / L, and the composition and preparation method of each raw material are the same as in Example 5. The morphology of the oil sand dissociation agent emulsion is similar to that of Example 1, and the particle size distribution test results are as follows. Figure 8 As shown, the average droplet size of the aqueous phase is 8–16 μm.

[0075] Example 7

[0076] The difference between this embodiment and Example 5 is that the emulsion-type capsule sustained-release oil sand dissociation agent is composed of the following raw materials by volume percentage: 87% oil phase, 10% aqueous flocculant solution, and 3% emulsifier; the concentration of the aqueous flocculant solution is 100 mg / L. The composition of each raw material and the preparation method are the same as in Example 5, wherein the oil phase containing emulsifier includes an emulsifier with a volume concentration of 3.45%. The morphology of the oil sand dissociation agent emulsion is similar to that of Example 1, and the particle size distribution test results are as follows. Figure 9 As shown, the average droplet size of the aqueous phase is 7–19 μm.

[0077] Comparative Example 1

[0078] An emulsion-type capsule sustained-release oil sand dissociator is composed of the following raw materials by volume percentage: 69% oil phase, 30% aqueous phase, and 1% emulsifier; wherein the oil phase is kerosene, the aqueous phase is purified water, and the emulsifier is sorbitan fatty acid ester Span-80.

[0079] Preparation methods include:

[0080] Sorbitan fatty acid ester Span-80 was added to kerosene and stirred at 200 r / min for 10 min until completely dispersed to obtain an oil phase containing emulsifier. After mixing purified water with the oil phase containing emulsifier, a high-shear dispersing emulsifier was used to stir, disperse and emulsify at 1500 r / min for 10 min to obtain an emulsion-type capsule sustained-release oil sand dissociator.

[0081] Particle size distribution test results are as follows Figure 10 As shown, the average droplet size of the aqueous phase is 15~28μm.

[0082] Comparative Example 2

[0083] An oil sand disintegrating agent is a 1 wt% dilute sodium hydroxide solution, i.e., an alkaline solution.

[0084] Example 8

[0085] The application of the above-mentioned disintegrating agent in the disintegration of oil sands uses oil sands containing asphaltene (26.4%), water (1.1%), oil (8.0%), and sand and clay (64.5%) by mass percentage as raw material. The method includes: adding one of Examples 1-6 and Comparative Examples 1-2 to the oil sands at a solid-liquid ratio (mass ratio) of 1:5, and stirring at 400 r / min for 60 minutes at room temperature. The process involved separating the upper liquid and lower solid layers. The separated upper liquid was then filtered, and the filtered material (including fine mineral particles) and the lower solid material (mainly sand, minerals, and clay) were repeatedly washed, dried, and weighed. The weight of the oil sand before and after dissociation was compared with the weight of the oil sand before dissociation. The difference before and after dissociation was calculated (i.e., the amount of bitumen obtained from the dissociation of the oil sand). This difference was then divided by the weight represented by the mass percentage of bitumen to obtain the oil sand dissociation rate. During the process, the calcium and magnesium ion content and pH of the lower liquid were measured. In the oil sand dissociation operation in Example 7, the solid-liquid ratio was adjusted to 1:10. The results are shown in Table 1.

[0086] Table 1. Results of Oil Sand Liberation Test

[0087]

[0088] As can be seen from Table 1, after using the water-in-oil slow-release emulsion-type oil sand dissociation agent prepared in Examples 1 to 7 of this invention, the calcium and magnesium ion content was significantly reduced, the pH was maintained at around 7.5, and the oil sand dissociation rate was significantly increased, with all dissociation rates exceeding 90%. In Comparative Example 1, no flocculant was added, and the calcium and magnesium ion content in the lower liquid layer increased significantly. Even after repeated rinsing of the lower solid material, the asphalt and other solid materials could not be separated, resulting in a decrease in the oil sand dissociation rate. In Comparative Example 2, an alkaline solution was used, and the oil sand dissociation rate was the lowest without heating. The above content further verifies the advantages of the water-in-oil slow-release emulsion-type oil sand dissociation agent in oil sand dissociation, which can effectively improve the oil sand mining effect.

[0089] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A sustained-release oil sand dissociator in an emulsion-type capsule, characterized in that, It is a water-in-oil emulsion formed by mixing an aqueous flocculant solution with a volume ratio of (10~30):(70~90) and an oil phase containing emulsifier; The aqueous phase flocculant solution includes flocculant at a concentration of 10-100 mg / L, and the emulsifier-containing oil phase includes emulsifier at a volume concentration of 1-4%.

2. The emulsion-type capsule sustained-release oil sand dissociator as described in claim 1, characterized in that, The flocculant is an anionic polymer flocculant, a polyphosphate flocculant, or an aminocarboxylate flocculant.

3. The emulsion-type capsule sustained-release oil sand dissociator as described in claim 1, characterized in that, The oil phase containing the emulsifier includes one or more of kerosene and oleic acid esters.

4. The emulsion-type capsule sustained-release oil sand dissociator as described in claim 1, characterized in that, The oil phase in the emulsifier-containing oil phase is biodiesel.

5. The emulsion-type capsule sustained-release oil sand dissociator as described in claim 1, characterized in that, The emulsifier is a fatty acid metal soap emulsifier, a sorbitan fatty acid ester emulsifier, or a glycerol ester emulsifier.

6. The emulsion-type capsule sustained-release oil sand dissociator as described in claim 1, characterized in that, The average droplet size of the aqueous phase in the water-in-oil emulsion is 3~20μm.

7. A method for preparing an emulsion-type capsule sustained-release oil sand dissociation agent as described in any one of claims 1-6, characterized in that, A flocculant is dispersed in water to obtain an aqueous flocculant solution; an emulsifier is dispersed in an oil phase to obtain an oil phase containing an emulsifier; the aqueous flocculant solution and the oil phase containing an emulsifier are mixed to obtain a water-in-oil emulsion type capsule-type sustained-release oil sand dissociator.

8. The preparation method of the emulsion-type capsule sustained-release oil sand dissociation agent as described in claim 7, characterized in that, The method for mixing the aqueous flocculant solution and the oil phase containing emulsifier includes high-speed shear dispersion emulsification.

9. The application of an emulsion-type capsule sustained-release oil sand dissociation agent as described in any one of claims 1-6 in oil sand dissociation, characterized in that, include: The oil sand and the emulsion-type capsule slow-release oil sand dissociation agent are mixed and stirred at a mass ratio of 1: (5~10) to separate the upper liquid and the lower solid. Then, asphalt is obtained by separating the upper liquid.

10. The application as described in claim 9, characterized in that, The stirring method includes stirring at a speed of 300~500 r / min for 60~80 min.

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