Microencapsulated product oil drag reducer based on plant-based material and preparation method thereof

Abstract

The invention is suitable for the technical field of chemical engineering, and provides a microencapsulated finished product oil drag reducer based on a plant-based material and a preparation method thereof.High-viscosity vegetable oil is dehydrated and then mixed with polylactic acid to form a stable emulsion, and microcapsule particles are obtained through a spray drying method; mixing with isooctanol to form a uniform drag reducer emulsion; the vegetable oil can be selected from sunflower seed oil, soybean oil or cottonseed oil, and the concentration of polylactic acid is 5-15%. The drag reducer shows excellent flowability and lubricity, can effectively reduce the frictional resistance of finished oil in the storage and transportation processes, remarkably improves the flowability of oil products, and is especially suitable for working conditions under low-temperature and high-shear conditions; compared with a traditional liquid drag reducer, the liquid drag reducer has better storage performance and transportation safety, the leakage risk is reduced, the filling process is simplified, the drag reduction requirements in different environments can be rapidly met, and wide application prospects are shown.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of chemical industry, and particularly relates to a microencapsulated finished oil drag reducing agent based on plant-based materials and a preparation method thereof. BACKGROUND

[0002] In the process of liquid transportation, storage and application, fluid flow resistance is a key factor affecting energy efficiency and transportation cost. With the increasing demand for renewable resources and environmentally friendly materials, plant-based drag reducing agents have gradually attracted attention. Although plant extracts or plant oils generally have good drag reduction characteristics, their physical and chemical properties change easily during long-distance transportation, which leads to unstable drag reduction effect, becoming an important bottleneck for the application of plant-based drag reducing agents.

[0003] Microencapsulation technology is an effective means to preserve active ingredients and improve their stability. By microencapsulating plant-based materials, the durability of drag reduction performance can be maintained under different transportation and storage conditions. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a preparation method of a microencapsulated finished oil drag reducing agent based on plant-based materials, aiming to solve the problems raised in the background art.

[0005] The embodiments of the present application are implemented as follows: a preparation method of a microencapsulated finished oil drag reducing agent based on plant-based materials, comprising the following steps: dehydration treatment of high-viscosity plant oil to obtain pure plant oil; mixing the pure plant oil with biodegradable polymers to form a stable emulsion; drying the emulsion to obtain dry microcapsule particles; dissolving the obtained microcapsule particles in a solvent to form a uniform drag reducing agent emulsion.

[0006] Preferably, the high-viscosity plant oil is one of sunflower oil, soybean oil, and cottonseed oil.

[0007] Preferably, the biodegradable polymer is polylactic acid or polyvinyl alcohol.

[0008] Preferably, in the step of drying the emulsion, spray drying method is used for drying treatment.

[0009] Preferably, the spray drying method has a spray temperature of 50-70℃, an air flow speed of 80-120m / s, and a drying time of 1-3 hours.

[0010] Preferably, the diameter of the microcapsule particles is 1-10μm.

[0011] Preferably, the solvent is isooctanol or n-butanol.

[0012] Another object of the present application is to provide an application of the microencapsulated finished oil drag reducer based on plant-based materials in liquid transportation, storage and use.

[0013] The microencapsulated finished oil drag reducer based on plant-based materials provided by the present application has the following specific features: It has a unique molecular structure, which is formed by combining high-viscosity plant oil and biodegradable polymer. The plant oil part provides excellent lubricating performance, while the polymer part enhances the thermal stability and chemical inertness of the drag reducer, thereby ensuring its performance stability under various temperature and environmental conditions. The drag reduction mechanism of the drag reducer is mainly based on the microcapsule structure of plant-based materials, which can form a smooth lubricating film on the oil product interface, effectively reducing friction and flow resistance. At the same time, the polar functional groups in the polymer promote the interaction between traditional oil phase molecules (such as alkanes), further reducing shear stress and optimizing the flow performance of the oil product. The drag reducer has excellent lubricating performance, good compatibility and stability, and can maintain good drag reduction effect under low temperature and harsh working conditions. In addition, the dispersibility of the drag reducer in finished oil is significantly improved, avoiding precipitation and stratification, which significantly improves the economic benefits and application value of the oil product. The preparation method combines emulsion polymerization and spray drying technology, ensuring that the synthesis process is simple and controllable. Each reaction step is optimized to effectively improve the purity and performance stability of the product. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The drag reduction data curve of the microencapsulated finished oil drag reducer based on plant-based materials provided by the present application is provided. Figure 2 The drag reduction data curve of the microencapsulated finished oil drag reducer based on plant-based materials provided by the present application is provided. Figure 3 The drag reduction data curve of the microencapsulated finished oil drag reducer based on plant-based materials provided by the present application is provided. Figure 4 The drag reduction data curve of the microencapsulated finished oil drag reducer based on plant-based materials provided by the present application is provided. Figure 5 The drag reduction data curve of the microencapsulated finished oil drag reducer based on plant-based materials provided by the present application is provided. Figure 6 The drag reduction data curve of the microencapsulated finished oil drag reducer based on plant-based materials provided by the present application is provided. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0016] A microencapsulated finished oil drag reducing agent based on plant-based material, the preparation method comprising the following steps: (1) Select a high viscosity plant oil, such as sunflower oil or soybean oil (200 g), and subject it to a dehydration treatment (the dehydration treatment can use a centrifugal method or a steam dehydration method) to ensure removal of moisture and impurities, obtaining a pure plant oil; (2) Mix the plant oil with a biodegradable polymer (such as polylactic acid or polyvinyl alcohol, 200 mL) and form a stable emulsion, the polymer concentration being 5%-15%; (3) Dry the emulsion in step (2) by a spray drying method, the spray temperature being controlled at 50-70°C (air flow speed being 80-120 m / s, drying time being controlled at 1-3 hours) to obtain dried microcapsule particles; (4) Dissolve the obtained microcapsule particles (1-10 μm, 30 g) in an appropriate amount of solvent (such as isooctanol, n-butanol, etc., 100 g) to form a uniform drag reducing agent emulsion, which is finally applied to finished oil drag reduction; The mass deviation of the above raw materials is allowed to be within ±5%.

[0017] The specific implementation of the present application is described in detail below in combination with specific examples.

[0018] Example 1, a microencapsulated finished oil drag reducing agent based on plant-based material, the preparation method comprising the following steps: (1) Use 200 g of sunflower oil, which is subjected to a centrifugal dehydration treatment so that the moisture content is less than 1%; (2) Mix the above sunflower oil with 200 mL of polylactic acid (PLA, concentration being 10%) to form a stable emulsion; (3) Use a spray drying method to spray the emulsion into a drying chamber, the spray temperature being set at 60°C, the air flow speed being 90 m / s, and the drying treatment being performed for 1 hour to obtain dried microcapsule particles; (4) Dissolve the obtained microcapsule particles (30 g) in 100 g of isooctanol to form a uniform drag reducing agent emulsion.

[0019] Example 2, a microencapsulated finished oil drag reducing agent based on plant-based material, the preparation method comprising the following steps: (1) Use 200 g of soybean oil, which is subjected to a steam dehydration treatment to ensure that the moisture content is less than 1%; (2) The soybean oil is mixed with 200 mL of polyvinyl alcohol (PVA, concentration of 8%) to form an emulsion; (3) The emulsion is stored at -30°C for 12 hours using freeze-drying method to form dry microcapsule particles; (4) The obtained microcapsule particles 30 g are added to 100 g of n-butanol and stirred thoroughly to form a drag reducer emulsion.

[0020] Example 3, a microencapsulated finished oil drag reducer based on plant-based material, the preparation method comprising the following steps: (1) 200 g of cottonseed oil is used, and steam dewatering method is used to remove water to ensure that the impurity content is minimized; (2) The cottonseed oil is mixed with 200 mL of polylactic acid (PLA, concentration of 12%) to form a stable emulsion; (3) The emulsion is treated by spray drying method, the spray temperature is set to 65°C, the airflow speed is 100 m / s, and the dry treatment is performed for 2 hours to obtain dry microcapsule particles; (4) The obtained microcapsule particles 30 g are mixed with 100 g of isooctanol and stirred uniformly to form a drag reducer emulsion.

[0021] Example 4, a microencapsulated finished oil drag reducer based on plant-based material, the preparation method comprising the following steps: (1) 200 g of rapeseed oil is used, and filtration is performed to remove impurities and water; (2) The rapeseed oil is mixed with 200 mL of polyvinyl alcohol (PVA, concentration of 10%) to form a uniform emulsion; (3) The double emulsion freeze-drying method is used for treatment, the temperature is set to -25°C, and the treatment is maintained for 15 hours to form microcapsule particles; (4) The obtained microcapsule particles 30 g are dissolved in 100 g of n-butanol and stirred uniformly to obtain a drag reducer emulsion.

[0022] Example 5, a microencapsulated finished oil drag reducer based on plant-based material, the preparation method comprising the following steps: (1) 200 g of sunflower oil is used, and vacuum drying treatment is performed to ensure that the water content in the oil product is less than 1%; (2) The sunflower oil is mixed with 200 mL of polylactic acid (PLA, concentration of 5%) to form a stable emulsion; (3) The spray drying method is used, the spray temperature is set to 70°C, the airflow speed is 95 m / s, and dry microcapsules are obtained; (4) The microcapsule particles 30 g are mixed with 100 g of isooctanol and stirred uniformly to form a drag reducer emulsion.

[0023] Example 6, a microencapsulated finished oil drag reducer based on plant-based material, a preparation method thereof comprising the following steps: (1) using 200 g of soybean oil, water is removed by laser cleaning method to ensure high purity of the oil product; (2) mixing the above soybean oil with 200 mL of polyvinyl alcohol (PVA, concentration of 8%) to form a stable emulsion; (3) using freeze-drying method, the emulsion is treated at -20℃ to obtain microcapsule particles; (4) dissolving 30 g of the obtained microcapsule particles in 100 g of n-butanol, and fully stirring to form a drag reducer emulsion.

[0024] The drag reduction rates of the drag reducers prepared in Examples 1-6 and the existing alpha-olefin drag reducer are determined, wherein the drag reduction rate determination experiment method is as follows: Experimental sample: the drag reducers prepared in Examples 1-6 and No. 0 diesel oil; Working condition parameters: the loop test temperature is 60℃, the test diesel oil density at 60℃ is 785.4 kg / m3, and the dynamic viscosity is 1.78 mPa.s; Experimental device: the drag reducer effect evaluation device is an indoor test loop, and the overall design and processing of the device is based on SY / T 6578-2016 “Technical Specification for Adding Drag Reducers in Oil Pipelines”, and the inner diameter of the test pipeline is 12.7 mm; In addition, the drag reducers prepared in Examples 1-6 are prepared into different concentrations, and the drag reduction rates are tested respectively, and a curve is drawn, and the results of Example 1 are as shown in Figure 1 , the results of Example 2 are as shown in Figure 2 , the results of Example 3 are as shown in Figure 3 , the results of Example 4 are as shown in Figure 4 , the results of Example 5 are as shown in Figure 5 , and the results of Example 6 are as shown in Figure 6 The best results of Examples 1-6 and the drag reduction rate results of the existing alpha-olefin drag reducer are made into a table, as shown in Table 1: Table 1

[0025] According to Figures 1 to 6 and Table 1, it can be seen that the performance of the drag reducer prepared in the examples of the present application is better than that of the drag reducer of the prior art.

[0026] In summary, the plant-based material-based microencapsulated finished oil drag reducer proposed in the embodiment of the present application aims to solve the problem of unstable performance of existing plant-based drag reducers in long-distance transportation. By combining plant oil with biodegradable polymers, the flowability and shear resistance of the drag reducer are significantly improved, especially under low temperature and high shear conditions. In addition, the preparation method of the embodiment of the present application is carefully designed, which simplifies the production process, improves the production efficiency, effectively reduces the production cost, and ensures the effectiveness and safety of the drag reducer under various environmental conditions. At the same time, the natural plant material used in the drag reducer has excellent biocompatibility and environmental protection characteristics, meets the global requirements for sustainable development, and meets the urgent needs of the finished oil industry for high-performance, environmentally friendly and safe drag reducers. The embodiment of the present application combines plant-based materials with biodegradable polymers to form microencapsulated drag reducers. The modified microcapsules can interact with finished oil molecules, mainly through hydrogen bonds and van der Waals forces, effectively forming a dense lubricating film, reducing the adhesion between finished oil molecules, and significantly reducing the flow resistance during transportation, reducing the pressure of oil during transportation. The drag reducer not only retains the good lubricating properties of plant oil, but also significantly improves its flowability and stability under low temperature and high shear rate conditions. The special molecular structure of the plant-based material enhances the chemical stability of the drag reducer, allowing it to perform excellently under extreme conditions, avoiding the common degradation and failure problems of traditional drag reducers. In addition, the low surface tension and good lubricity of the plant-based material help to reduce fluid friction and improve the flow characteristics of finished oil in the pipeline. In particular, in low temperature environments, the modified drag reducer can effectively reduce the viscosity of the oil, further improving the drag reduction effect. This new design effectively solves the performance deficiency of traditional drag reducers in cold weather conditions, providing a reliable solution for efficient transportation of finished oil and exhibiting broad market application potential.

[0027] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a microencapsulated drag-reducing agent for finished oil products based on plant-based materials, characterized in that, Includes the following steps: High-viscosity vegetable oil is dehydrated to obtain pure vegetable oil; Pure vegetable oils are mixed with biodegradable polymers to form a stable emulsion; The emulsion was dried to obtain dried microcapsule particles; The obtained microcapsule particles were dissolved in a solvent to form a uniform drag-reducing emulsion.

2. The method for preparing microencapsulated oil drag reducer based on plant-based materials according to claim 1, characterized in that, The high-viscosity vegetable oil is one of sunflower seed oil, soybean oil, or cottonseed oil.

3. The method for preparing microencapsulated oil drag reducer based on plant-based materials according to claim 1, characterized in that, The biodegradable polymer is polylactic acid or polyvinyl alcohol.

4. The method for preparing microencapsulated oil drag reducer based on plant-based materials according to claim 1, characterized in that, In the step of drying the emulsion, spray drying is used.

5. The method for preparing microencapsulated oil drag reducer based on plant-based materials according to claim 4, characterized in that, The spray drying method uses a spray temperature of 50-70℃, an airflow velocity of 80-120 m / s, and a drying time of 1-3 hours.

6. The method for preparing microencapsulated oil drag reducer based on plant-based materials according to claim 1, characterized in that, The diameter of the microcapsule particles is 1-10 μm.

7. The method for preparing microencapsulated oil drag reducer based on plant-based materials according to claim 1, characterized in that, The solvent is isooctanol or n-butanol.

8. A microencapsulated drag reducer for finished oil products based on plant-based materials, characterized in that, It is prepared using the preparation method described in any one of claims 1-7.

9. The application of a microencapsulated finished oil drag reducer based on plant-based materials as described in any one of claims 1-7 in liquid transportation, storage and use.

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