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Room-temperature CO2 switch type compound emulsifier

A compound emulsifier and carbon dioxide technology, applied in chemical instruments and methods, chemical/physical processes, dissolution, etc., can solve the problems of high energy consumption, unfavorable heat-sensitive compounds, etc., and achieve high efficiency

Inactive Publication Date: 2017-04-26
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Studies have shown that raising the temperature of the emulsion to 65°C requires heating and consumes a lot of energy, and is not conducive to heat-sensitive compounds. Therefore, the high-temperature demulsification method has certain limitations in industrial applications

Method used

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  • Room-temperature CO2 switch type compound emulsifier

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1: CO 2 / N 2 Surface activation of nano-silica particles by switch-type surfactants. Take 7mL of surfactant aqueous solutions with a series of concentrations and put them into 25mL columnar vials, add 0.035g of commercial nano-silica particles (HL-220, the primary particle size is about 20nm, and the BET specific surface area is 200m 2 / g, produced by Wuxi Jinding Longhua Chemical Co., Ltd.), disperse the particles with an ultrasonic disperser (JYD-650, Shanghai), add 7mL of n-decane, emulsify with a high-shear emulsifier for 2min, and obtain a stable O / W Pickering Emulsion, the appearance photographs and micrographs of the emulsion were taken after standing for one week. Figure 5 The micrographs show that compared with the surfactant alone, the nanoparticles and the surfactant at a very low concentration can stabilize the emulsion. decrease, indicating that these emulsion nanoparticles are stable. The relevant mechanism of action is as follows: nano-silica...

Embodiment 2

[0021] Example 2: CO of Pickering emulsions at room temperature 2 / N 2 Responsive validation. Ultrasonically disperse 0.035g of nano-silica particles in 7mL of surfactant aqueous solution (concentration: 0.01mM), add 7mL of n-decane, and homogeneously emulsify with a high-shear emulsifier for 2min to obtain a stable O / W Pickering emulsion liquid. Bubble N into the emulsion at room temperature 2 After one hour, the emulsion breaks and the oil and water separate. When the solution was bubbled with CO at room temperature 2 , the surfactant intermediate is reprotonated, and then adsorbed to the surface of the silica particles, endowing the particles with surface activity, and the particles can stabilize the emulsion. This can be repeated many times.

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Abstract

The invention relates to a room-temperature CO2 switch type compound emulsifier and belongs to the field of colloid and interface chemistry. The emulsifier is prepared from unmodified commercial nano silica particles and a CO2 / N2 switch type surfactant, the primary particle size of nano silica particles is 20-200 nm, the use concentration is 0.1%-10% (based on the aqueous phase), an emulsifier stabilized emulsion belongs to Pickering emulsion, inactivation of the emulsification and demulsification of the emulsion are caused after introducing N2 or air into the emulsion at the room temperature (subzero 5-35 DEG C), CO2 is introduced into the emulsion at the room temperature (subzero 5-35 DEG C), the activity of the emulsion can be recovered, and a Pickering emulsion can be obtained again. The emulsifier and the emulsion have important application value in chemistry and chemical engineering related fields of oil delivery and processing, emulsion polymerization, wastewater treatment, emulsion explosives and the like as well as multiple fields of food, textile dyeing and finishing, leather and the like.

Description

technical field [0001] The invention relates to a carbon dioxide switching type composite emulsifier at room temperature, belonging to the technical field of colloid and interface chemistry. Background technique [0002] Emulsions are thermodynamically unstable systems stabilized by surfactants or polymers, and the concentration of surfactants is relatively high, generally significantly greater than its critical micelle concentration cmc. Therefore, people began to work on the development of Pickering emulsions stabilized by surface active particles, which are generally ultra-stable and can maintain long-term stability, because these surface active particles are adsorbed at the oil / water interface to form a tight particle film, preventing Coalescence between droplets. In some practical applications, such as the production and storage of food, cosmetics, pesticide preparations, etc., the long-term stability of emulsions is very important. However, in other occasions, such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F17/16B01F17/54C09K23/16C09K23/54
CPCC09K23/00
Inventor 蒋建中马宇萱张杜炎崔正刚
Owner JIANGNAN UNIV
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