Carbon quantum dot modified polystyrene oil displacement material and preparation method thereof

A polystyrene, carbon quantum dot technology, applied in chemical instruments and methods, general water supply saving, drilling composition and other directions, can solve problems such as poor temperature resistance, reduce interfacial tension, improve oil recovery, good The effect of oil washing ability

Active Publication Date: 2021-02-26
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a polystyrene oil displacement material modified by carbon quantum dots and its preparation method for the problem of poor temperature resistance when carbon quantum dots are used as oil displacement agents

Method used

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  • Carbon quantum dot modified polystyrene oil displacement material and preparation method thereof
  • Carbon quantum dot modified polystyrene oil displacement material and preparation method thereof
  • Carbon quantum dot modified polystyrene oil displacement material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Preparation of carboxylated carbon quantum dots: Mix 2 g of anhydrous citric acid and 20 mL of deionized water, place in an ultrasonic washing machine to completely dissolve the citric acid; then place in a microwave oven at 700W for 4 minutes to obtain a mixture. There is a certain solid residue in the obtained mixture, add 20mL of deionized water, place it in an ultrasonic washing machine, and ultrasonically disperse it evenly for 5 minutes; then transfer it to a centrifuge tube, and separate it for 5 minutes in a high-speed centrifuge at 8000r / min; collect the supernatant Carry out dialysis, transfer the supernatant into a 500-1000D dialysis bag, dialyze with deionized water for 48 hours, and change the water every 6 hours. The solution after the dialysis is transferred out for freeze-drying, and the obtained solid product is purified carboxylated carbon quantum dots.

Embodiment 2

[0025] Preparation of carboxylated carbon quantum dots: Mix 0.5g of anhydrous citric acid with 5mL of deionized water, then place it in an ultrasonic washing machine, ultrasonically disperse it for 10 minutes, and dissolve it completely; then place the solution in a microwave oven with a power of 400W for heating reaction After 8 minutes, a mixture containing carboxylated carbon quantum dots was obtained. Add 100mL of deionized water to the mixture containing carboxylated carbon quantum dots and ultrasonically disperse it for 30 minutes to make it evenly dispersed. If there is no solid residue in the mixture, dialyze it directly. If there is residue, use a high-speed centrifuge to separate and centrifuge at 8000r / min for 5-10min , retain the supernatant where the carboxylated carbon quantum dots are located; add the supernatant to a 500-1000D dialysis bag and dialyze with deionized water for 48 hours, add one-third of the volume of the dialysis bag during dialysis, and change i...

Embodiment 3

[0027] The preparation of mono-primary amino polystyrene comprises the following substeps:

[0028] (1) Synthesis of chain transfer agent (CTA):

[0029] Add 3.57g of 1-butanethiol, 6.07g of carbon disulfide and 25ml of chloroform in a dry three-necked flask equipped with a polytetrafluoroethylene rotor, a constant pressure dropping funnel and a condenser tube, and slowly add 8.21g of triethylamine dropwise under stirring, The solution turned orange-yellow with the formation of the intermediate triethylaminobutyl trithiocarbonate. After the solution was stirred at room temperature for 3 hours, 9.59 g of N-bromomethylphthalimide was slowly added in batches, and the addition time was not less than 30 minutes. The solution of the mixture thickened with the formation of bromide salt, and the solution was continued to react at room temperature for 16h. After the reaction finishes, add 20ml chloroform to dilute the reaction mixture, and the organic phase is washed with deionized w...

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Abstract

The invention discloses a preparation method of a carbon quantum dot modified polystyrene oil displacement material, which comprises the following steps: uniformly dissolving citric acid in deionizedwater, carrying out one-step synthesis by a microwave method, and purifying the solution to obtain carboxylated carbon quantum dots; carrying out a reversible addition fragmentation transfer method reaction to synthesize single primary amine polystyrene; and finally, stirring the carboxylated carbon quantum dots, mono-primary amino polystyrene and a 1,1-carbonyldiimidazole condensing agent at 30-50 DEG C to react for 3 hours, and pouring the solution into absolute ethyl alcohol to separate out a polymer. The polymer is carbon quantum dot modified polystyrene and is used as an oil displacementmaterial. The oil displacement material synthesized by the method can effectively reduce interfacial tension and has good oil washing capability; when the polymer is applied to oil displacement, compared with water displacement and carboxylated carbon quantum dot solution displacement, the recovery ratio is obviously increased.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a polystyrene oil displacement material modified by carbon quantum dots and a preparation method thereof. Background technique [0002] Nanoparticles can not only maintain or even better display their physical and chemical properties at the microscopic scale, but also have the characteristics of large surface area and strong surface energy, which can change the wettability of rock walls, reduce oil-water interfacial tension, and increase interfacial viscosity. Therefore, nanoparticles dispersed in fluids have great application prospects in enhanced oil recovery. For example, carbon quantum dots are composed of dispersed spheroidal carbon particles with extremely small size below 10nm, so they can be used as oil-displacement materials and formulated into oil-displacement fluids. However, the oil displacement fluid formulated with nanoparticles has poor temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C08F112/08C08F2/38C09K8/588C09K8/88
CPCC08G83/001C08F112/08C08F2/38C09K8/588C09K8/882C08F2438/03C09K2208/10Y02A20/204
Inventor 林凌余文可罗云翔李鑫古晗王国静
Owner SOUTHWEST PETROLEUM UNIV
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