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Pickering emulsion with CO2/double-response type surfactant and preparation method of Pickering emulsion

A surfactant and emulsion technology, applied in the field of Pickering emulsion and preparation, can solve the problems of unsuitability for industrial application, complex chemical synthesis process, cumbersome preparation, etc., and achieve simple preparation method, simple response process, and low dosage Effect

Active Publication Date: 2021-08-24
DONGYING SPRING PETROLEUM ENG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, researchers have developed a series of colloidal particles with switch-responsive properties. However, most of these nanoparticles are organic polymer particles functionalized by responsive groups. The chemical synthesis process is complicated, and the preparation is cumbersome and not suitable for industrial applications

Method used

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  • Pickering emulsion with CO2/double-response type surfactant and preparation method of Pickering emulsion
  • Pickering emulsion with CO2/double-response type surfactant and preparation method of Pickering emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The first step, preparation of carboxyl-modified nano-silica particles

[0033] First, accurately weigh 5g of silica nanoparticles with a balance, measure 9mL of aminopropyltriethoxysilane and 100mL of dehydrated toluene with a graduated cylinder, add them to a 250mL flask, and then add a few drops of triethylamine to make Accelerator, put the flask into an oil bath at 110°C for magnetic stirring, and reflux for 5 hours. After the reaction, cool down to room temperature, centrifuge through a centrifuge, remove the solvent toluene, wash and centrifuge with water and absolute ethanol several times, and finally dry to obtain surface aminated silica nanoparticles.

[0034]Weigh 3g of surface-aminated silica nanoparticles, add them to a flask containing 100mL of N,N-dimethylformamide solvent, put them into an ultrasonic instrument and sonicate for about 10min, so that the nanoparticles are fully dispersed in the solvent, Then add 6g of succinic anhydride, then drop a few dr...

Embodiment 2

[0039] CO 2 / oxidation-reduction is the performance detection of the dual stimulus-responsive surfactant stable emulsion of switch, the ferrocene surfactant of different quality is added into 10mL deionized water, makes it disperse evenly in deionized water with ultrasonic instrument (surface Concentration of active agent aqueous solution<CMC), add above-mentioned solution and 10mL paraffin oil in a 30mL glass vial, utilize vortex shaker to emulsify 3min under 1000rpm rotating speed, can not obtain stable emulsion, show that when surfactant concentration When it is less than CMC, no stable emulsion can be formed.

Embodiment 3

[0041] CO 2 Surface activation of carboxylated silica nanoparticles by dual stimuli-responsive surfactants / redox switches.

[0042] Option One:

[0043] Add 0.00299g of ferrocene surfactant into 10mL of deionized water (the use concentration based on the water phase is 1.0×10 -3 mol L -1 ), at the same time, add 0.1g of carboxyl-modified nano-silica particles of different sizes (the water phase is a reference concentration of 1wt%, and the primary particle diameter is respectively 20nm, 30nm, 50nm, 100nm, 200nm), using an ultrasonic instrument It was evenly dispersed in deionized water, and the above solution was added into a 30mL glass vial containing 10mL of paraffin oil, and emulsified with a vortex shaker at 1000rpm for 3min to obtain a stable Pickering emulsion. The results are shown in Table 1.

[0044] Option II:

[0045] Ferrocene surfactants of different concentrations were added to 10mL deionized water (masses were respectively 0.000299g, 0.001495g, 0.00299g, 0.0...

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Abstract

The invention discloses a Pickering emulsion with a CO2 / double-response surfactant and a preparation method of the Pickering emulsion, which belong to the technical field of oil and gas field chemical agents. The preparation method comprises the following steps of firstly preparing carboxyl modified nano silicon dioxide particles, then preparing a CO2 / redox dual-responsive surfactant, finally mixing the carboxyl modified nano silicon dioxide particles and the CO2 / redox dual-responsive surfactant according to a certain proportion, adding the mixture into an oil phase and a water phase according to a certain proportion, and emulsifying through a vortex oscillator at a certain rotating speed to obtain the product. The emulsion has good stability, when the emulsion does not need to be kept in a stable state any more, the stable state of the emulsion can be broken and demulsification can be achieved only by introducing CO2 or adding an oxidizing agent into an emulsion system, on the other hand, the reversible emulsification process can be achieved by introducing N2 or adding a reducing agent into the emulsion, and the stable emulsion is obtained again.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field chemicals, in particular to a chemical agent with CO 2 Pickering emulsion and preparation method of double responsive surfactant. Background technique [0002] Emulsions are widely used in production and life, but sometimes the emulsions only need to be stable in a certain stage, and in the subsequent stage, these emulsions need to be broken to avoid adverse effects. For example, in crude oil extraction, a surfactant needs to be added to form a stable emulsion at a specific stage, and these stable emulsions are required to be demulsified in the subsequent process. In these cases, additional physical or chemical disruption mechanisms must be introduced into the system to destabilize the emulsion, which significantly increases capital and operating costs. In order to meet the needs of production and life, researchers have conducted extensive research on switch-responsive emulsifiers in r...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/60
CPCC09K8/584C09K8/602
Inventor 任海宁孙春同孙永强孙霜青韩庆建赵䶮胡松青
Owner DONGYING SPRING PETROLEUM ENG TECH
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