Microencapsulated crude oil transportation drag reducer slurry and preparation method thereof

A technology of microencapsulation and drag reducing agent, applied in microcapsule preparation, microsphere preparation, mechanical equipment, etc., can solve the problems of poor storage stability and shear resistance, and achieve good shear resistance, average reduction The effect of increased resistivity and high content of drag-reducing polymer

Inactive Publication Date: 2014-12-17
TIANJIN VOCATIONAL INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a microencapsulated crude oil transport drag reducer slurry, which can overcome the shortcomings of existing drag reducer slurry with poor storage stability and shear resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 10.0 g of polymer grade TiCl 3 Add 100ml of freshly distilled hexane solvent to make a main catalyst suspension; add 50ml of diethylaluminum chloride to 150ml of freshly distilled hexane solvent to make a cocatalyst solution. A total of 500 g of α-octene with a mass percentage of 25% and α-dodecene with a mass percentage of 75% was added to a polymerization bottle as a polymerization raw material, and frozen in a freezer to below -5°C. Take the titanium trichloride catalyst and diethylaluminum monochloride co-catalyst with a syringe, mix and activate them for 30 seconds, then add them into the polymerization bottle containing α-olefin, and shake well. The weight ratio of the catalyst added is α-olefin:titanium trichloride:diethylaluminum chloride=1500:1:3. When the olefin mixture is pre-polymerized until the viscosity of the reaction solution reaches the point where the catalyst no longer sinks, it is left to react at -10°C to 15°C for 24 hours, and then it is continue...

Embodiment 2

[0042] Add 140mL tetraethyl orthosilicate, 15mL methyltriethoxysilane, 710mL absolute ethanol, 120mL deionized water and 15mL 2mol / L dilute phosphoric acid into a 1000mL reactor, stir well, and carry out hydrolysis reaction at room temperature for 8 -24h, 1000mL of hydrophobic nano-silica ethanol sol was obtained, the average particle size was 5-10nm, the solid content of nano-silica in the sol was about 5%, and the pH of the sol was 2-3.

Embodiment 3

[0044] Immerse 100 g of the drag-reducing polymer powder prepared in Example 1 in the 500 mL hydrophobic nano-silica ethanol sol prepared in Example 2, and stir for 5-10 minutes, so that the surface of the drag-reducing polymer powder is hydrophobic nano-silica ethanol sol Wet it completely, centrifuge the drag-reducing polymer powder, spin dry for 5-10 minutes, let the solvent evaporate completely, and form a hydrophobic nano-silica film on the surface of the drag-reducing polymer powder to obtain 101 g of encapsulated drag-reducing polymer powder. The mass of the layer accounted for 1.0% of the encapsulated drag reducing polymer powder.

[0045] Add 0.5g sodium dodecylsulfonate surfactant and 0.5g carboxymethyl cellulose thickener to 100mL deionized water and stir to dissolve, then add 50mL propylene glycol antifreeze solvent and 0.025g o-phenylphenol antibacterial agent and stir evenly , to obtain a transparent viscous liquid, then add 101g of the microencapsulated drag red...

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PUM

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Abstract

The invention discloses microencapsulated crude oil transportation drag reducer slurry. The surfaces of alpha-olefin drag reducing polymer particles which are pulverized at low temperature are coated with hydrophobic nano silicon dioxide films with mass of 0.5-2.0 percent of that of the particles to form the drag reducing polymer into slow-release microcapsules; the slow-release microcapsules are mixed with assistants such as solvent water, a surfactant, a thickener, an anti-freeze agent and a bacteriostatic agent to prepare stable drag reducer slurry. The microencapsulated drag reducer fundamentally eliminates the spontaneous coagulation of the drag reducing polymer particles, so that the storage stability of the drag reducer slurry is obviously improved; the content of the drag reducing polymer is high, the controllable release and a sustaining drag reducing function of the drag reducer are realized, the shear resistance and the average drag reduction rate are improved, and the drag reducer slurry is particularly suitable for drag reduction of long-distance crude oil transportation pipelines.

Description

technical field [0001] The invention relates to a drag-reducing agent slurry for microencapsulated oil transportation and a preparation method thereof, in particular to coating low-temperature pulverized α-olefin drag-reducing polymer particles with hydrophobic nano-silica sol to form a drag-reducing polymer The invention relates to a slow-release microcapsule and a method for further preparing a stable drag reducer slurry, belonging to the fields of petrochemical industry, environmental protection and energy saving. Background technique [0002] Drag reducer is a chemical additive widely used in pipeline transportation of crude oil and refined oil products. Adding a small amount into turbulent oil products can convert turbulent flow into laminar flow, greatly reduce the frictional resistance of the pipeline system, and rapidly and economically expand Improve the flow rate of the oil pipeline and reduce the energy consumption of the delivery pump, and improve the safety fact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17D1/17B01J13/12C08F210/14C08F4/642
Inventor 祖晓东李建生王韬刘冰冰
Owner TIANJIN VOCATIONAL INST
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