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Gas-liquid two-phase plasma reactor

A plasma and liquid technology, applied in chemical/physical/physical-chemical reactors, chemical/physical/physical-chemical fixed reactors, chemical instruments and methods, etc., can solve the problems of large bubble size distribution and incomplete control of double phase flow etc.

Active Publication Date: 2022-01-28
巴黎科学与文学基金会 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this reactor has the disadvantages of large bubble size distribution (from 0.1 to 1 cm), incomplete control of two-phase flow, and preferred paths for liquids

Method used

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  • Gas-liquid two-phase plasma reactor
  • Gas-liquid two-phase plasma reactor
  • Gas-liquid two-phase plasma reactor

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0103] According to a first embodiment, the high voltage power supply is a variable high voltage power supply, ie provides a variable high voltage. The high voltage provided by the high voltage power supply will more particularly be a sinusoidal high voltage, the frequency of which is advantageously between 1 Hz and 10 MHz, in particular between 100 Hz and 1 MHz, preferably between 100 Hz and 10 kHz. This creates microdischarges in the gas bubbles at precise frequencies. Advantageously, the frequency will be adapted to the experimental conditions, such as the nature of the gas, the velocity of the gas bubbles, the kinetics of the reaction of interest, etc. In this case, the high voltage (peak-to-peak voltage) is typically between 1 kV and 30 kV, especially between 5 kV and 20 kV, preferably between 10 kV and 15 kV.

[0104] According to a second embodiment, the high-voltage power supply is a high-voltage pulse power supply, ie provides pulsed high voltage. In this case, the ...

example 1

[0156] Materials and methods

[0157] The mercapto-ene based resin NOA-81 (Norland Optical Adhesive) was mainly used to prepare the microfluidic or millimeterfluidic devices according to the present invention. This resin was chosen over the traditionally used PDMS (polydimethylsiloxane) because of its good physical, chemical, electrical and optical properties: i) Unlike PDMS devices, the NOA-81 microreactor is Gases such as air and water vapor are impermeable, which ensures a closed environment for the plasma [1]; ii) the cured NOA-81 has a high elastic modulus (typically 1 GPa), which avoids sagging effect [1]; iii) NOA-81 exhibits less solvent swelling (swelling) effect than PDMS [1]; iv) NOA-81 has a dielectric constant of 4.05 at 1MHz, which also behaves as an insulating material; v) NOA -81 has high transmission in the visible and near UV range, enabling in situ discharge diagnostics (optical emission spectroscopy (OES) or ultrafast camera measurements). Thanks to these...

example 2

[0166] Materials and methods:

[0167] In order to measure the radical species transferred from the plasma bubble to the liquid phase, an EPR (Electron Paramagnetic Resonance) experiment was performed. For these experiments, argon bubbles were immobilized in cavities positioned along the main channel where the liquid flowed. With this geometry, it is easier to control the liquid residence time. Experiments were performed at a liquid flow of 10 μL / min. Under these conditions, the exposure time to the plasma was 0.9 s, corresponding to a ratio S / V of the surface exposed to the plasma phase to the liquid volume of 2000 m 2 / m 3 .

[0168] The liquid phase was deionized water including 0.4 mol / L of 5,5-dimethyl-pyrroline-N-oxide (DMPO), which is a commonly used spin-trap.

[0169] Increase the high voltage gradually until a discharge is observed. In this example, the Pk-Pk voltage is 3kV and its frequency is 2kHz.

[0170] The liquid phase with the spin-trapping agent passe...

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Abstract

The invention relates to a microfluidic or millimeterfluidic device (1) comprising: - a support (2) at least partially made of a dielectric material, said support (2) comprising a first inlet (21a) , a second inlet (21b), an outlet (22) and a main micron or millimeter channel (3), said first inlet (21a) being adapted to be connected to a first accumulator containing gas, said second inlet (21b ) is adapted to be connected to a second reservoir containing liquid, said outlet (22) is adapted to be connected to a receiving vessel containing gas and / or liquid, and said main micron or millimeter channel (3) exists in said medium - one or several ground electrodes (4) embedded in the dielectric material and along the main micro- or millimeter-channel (3 ) extension; and - one or several high voltage electrodes (5) embedded in said dielectric material and extending along said main micro-channel or millimeter channel (3); wherein said high-voltage electrodes (5) and Ground electrodes (4) are located on opposite sides of the main micron or millimeter channel (3), so that an electric field can be generated inside the main micron or millimeter channel (3). The invention also relates to a method for generating plasma in a continuous manner using such a microfluidic or millimeterfluidic device (1).

Description

technical field [0001] The present invention relates to microfluidic or millifluidic devices that can be used as gas-liquid plasma reactors, and to methods of using such devices to generate plasma. The microfluidic or millimeterfluidic device according to the present invention is intended to continuously generate plasma in a gas bubble (bubble) flowing in a liquid by applying a suitable electric field, so that the reactive species or molecules formed in the plasma can be effectively transferred into the liquid. Background technique [0002] Several documents disclose the use of electric fields in microfluidic or millimeterfluidic devices. Miura et al. in their patent application [9] describe a microreactor comprising a main flow channel capable of mixing two liquids, where a laser is used to accelerate the chemical reaction between the two liquids. An electric and / or magnetic field is then applied at the end of the main flow channel, thereby separating and concentrating th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/00B01J19/08B01J19/24
CPCB01J19/088B01J19/249B01J2219/00783B01J2219/00831B01J2219/00833B01J2219/00853B01J2219/0086B01J2219/00894B01J2219/0884B01J2219/0894B01J2219/2488B01J2219/249B01J19/0093
Inventor M·塔陶利安S·奥尼耶张梦雪
Owner 巴黎科学与文学基金会
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