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Novel emulsion with multiple response performance

An emulsion and responsive technology, applied in the preparation of organic compounds, organic chemistry, carboxylic acid amide preparation, etc., can solve problems such as difficulty in demulsification, and achieve the effect of reducing concentration

Active Publication Date: 2021-10-29
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional emulsions generally require the concentration of surfactant to be higher than its critical micelle concentration cmc, while Pickering emulsions require a lower concentration of surfactant (0.1cmc), but its demulsification is more difficult

Method used

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  • Novel emulsion with multiple response performance
  • Novel emulsion with multiple response performance
  • Novel emulsion with multiple response performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1: Surfactant N-8P-N + preparation of

[0059] Surfactant N-8P-N + The synthetic route of is as follows:

[0060]

[0061] (1) Acyl chloride reaction: Add 8-bromooctanoic acid solid (30g, 0.135mol) into a three-necked flask equipped with a device for absorbing tail gas and a reflux condenser, and add three drops of N,N-dimethylformamide as a catalyst , slowly added thionyl chloride (21 g, 0.178 mol) dropwise. The reaction temperature was 60° C., and the reaction was carried out for 1 h. Excess thionyl chloride was removed using a rotary evaporator to obtain Intermediate I.

[0062] (2) Amidation reaction: put dimethylamine hydrochloride (14g, 0.172mol) and triethylamine (50g, 0.494mol) in a low-temperature reactor at -10°C, and add intermediate Ⅰ (32.61g, 0.135mol) dropwise ) in dichloromethane solution, react for 2 hours after the end, and then extract the reaction solution with water for more than three times to remove excess triethylamine and dimeth...

Embodiment 2

[0068] Embodiment 2: Nano Al 2 o 3 Surface Activity Detection of

[0069] Weigh 0.0007g commercial nano-Al 2 o 3 Particles (primary particle size is about 13nm, SEM and TEM such as image 3 As shown) in a 25mL glass bottle, add 7ml of ultrapure water, and disperse evenly with an ultrasonic disperser, and the mass fraction of the particles is 0.01% (relative to the water phase). Then add 7mL of n-decane and emulsify for 2min with a high-shear homogenizer at a speed of 11000r / s, but a stable emulsion cannot be obtained, indicating that the commercial nano-Al 2 o 3 Particles are not surface active, such as Figure 4 shown.

Embodiment 3

[0070] Embodiment 3: the preparation of novel emulsion

[0071] Weigh 0.0007g of nano-Al 2 o3 Ultrasonic dispersion of particles in 7mL of N-8P-N with different concentrations + In the solution, add 7mL of n-decane, and emulsify with a high-shear homogenizer for 2min to obtain a stable new emulsion, such as Figure 5 shown. The SEM picture of the emulsion is as follows Figure 6 shown. After shelving for one month, the emulsion has no obvious change in appearance and remains stable, indicating that the resulting novel emulsion has better stability. N-9P-N at the same concentration + , N-10P-N + have a similar stabilizing effect.

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Abstract

The invention discloses a novel emulsion with multiple response performance, and belongs to the field of colloid and interface chemistry. The novel emulsion is formed by the combined action of a surfactant N-8P-N + and Al2O3 particles with positive charges, wherein the surfactant N-8P-N + has multiple responsiveness and contains rigid groups. Through a simple pH or CO2 / N2 trigger mechanism, the surface active particles can be intelligently converted between amphipathicity and strong polarity, and the emulsion can circulate in an emulsion forming-demulsification process. Compared with a traditional emulsion and a Pickering emulsion, the emulsion provided by the invention has the advantages of low concentration of used particles, low use concentration of a surfactant and easiness in demulsification, saves cost and has economic benefits. The whole process is carried out in an aqueous solution, and the introduction of rigid groups enables the conversion to be carried out more thoroughly, so that the recovery and reuse of the surfactant are realized, and the characteristic plays an important role in oil product emulsification transportation, emulsion polymerization, nano material synthesis and heterogeneous catalysis.

Description

technical field [0001] The invention specifically relates to a novel emulsion with multiple response properties, which belongs to the field of colloid and interface chemistry. Background technique [0002] Emulsion is a typical liquid / liquid multiphase dispersion system, which is composed of at least two liquid phases, and one liquid phase (dispersed phase) is uniformly dispersed in the other phase (continuous phase) in the form of droplets. Generally, it can be divided into oil-in-water (O / W) type and water-in-oil (W / O) type. Emulsions are widely used in real life, such as food, cosmetics, oily wastewater treatment, crude oil extraction and transportation, emulsion catalysis and polymerization, etc. According to the different types of emulsifiers, emulsions can be roughly divided into three types: traditional emulsions, Pickering emulsions and new emulsions. Traditional emulsions are generally considered to be kinetically stable but thermodynamically unstable systems, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C213/08C07C217/20B01F17/18B01F17/42C09K23/18C09K23/42
CPCC07C213/08C07C213/02C07C231/12C07C217/20C07C235/20
Inventor 裴晓梅刘佩李怀鑫崔正刚
Owner JIANGNAN UNIV
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