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A device and method for membrane distillation

A technology of membrane distillation and water vapor, applied in total evaporation, heating water/sewage treatment, energy wastewater treatment, etc., can solve the problems of improving water permeation flux in membrane distillation, achieve low equipment cost, improve efficiency, and reduce costs Effect

Active Publication Date: 2011-12-14
TIANJIN POLYTECHNIC UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] Retrieving researches at home and abroad, there is no report on improving the permeation flux of water in membrane distillation by using additional electrostatic force as the driving force for mass transfer

Method used

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  • A device and method for membrane distillation
  • A device and method for membrane distillation

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Embodiment 1

[0024] Such as figure 1 As shown, an exemplary asymmetric electrostatic field coupled membrane distillation device 10 includes a raw material chamber 7 , a permeation chamber 8 , and a flat membrane 9 . In one embodiment, the feed chamber 7 contains an inlet 1 and an outlet 2 for the aqueous solution. The aqueous solution is NaCl aqueous solution, the water molecules in the aqueous solution are 11-2, Na + Ion 11-1 and Cl - Ion 11-3, the NaCl content is 8wt%, the raw material flow rate is 0.6L / min, the raw material side temperature is 50°C, and the raw material side is normal pressure. In the raw material chamber 7, there is a plate electrode 5, which is a cathode; in the transmission chamber 8, a needle-shaped electrode 6, which is an anode. Apply a DC voltage of 2000 volts on the plate electrode 5 and the needle electrode 6 . The pressure in the permeation chamber 8 is 1 kPa.

[0025] The NaCl aqueous solution enters the raw material chamber 7 from the inlet 1, and conta...

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Abstract

The invention relates to a device for distilling a coupling membrane in asymmetric electrostatic fields, and the device comprises a raw material chamber, a permeation chamber, a membrane and electrodes, the electrodes enable a formation of the asymmetric electrostatic fields. The electrodes comprise a flat electrode and an acicular electrode. The direct current voltage applied on the electrodes is 101-104 volt. The invention is characterized in that under dual functions of temperature difference and potential gradient of the asymmetric electrostatic fields, the water molecule in an aqueous solution is formed to water vapor on the surface of the membrane by vaporizing, the water vapor is permeated through the membrane with a more rapid speed by taking the only existed temperature difference as the motive force and then enters the permeation chamber. The invention also relates to a method for distilling a coupling membrane of the asymmetric electrostatic fields.

Description

technical field [0001] The invention relates to a device and method for membrane distillation, in particular to a device and method for coupling membrane distillation using an asymmetric electrostatic field, which improves the permeation flux of water. Background technique [0002] Membrane distillation is a membrane separation process used to treat aqueous solutions. The two basic conditions for realizing separation by membrane distillation are: the use of hydrophobic microporous membrane and the temperature difference between the materials on both sides of the membrane. Taking direct contact membrane distillation as an example, one side of the porous hydrophobic membrane is directly exposed to the hot raw material liquid (called the high temperature side). side (called the low-temperature side); and because the materials on both sides of the membrane are at different temperatures, a water vapor pressure difference will be generated on both sides of the membrane. Under th...

Claims

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Application Information

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IPC IPC(8): B01D61/36C02F1/08C02F1/44
CPCY02W10/37
Inventor 杜润红
Owner TIANJIN POLYTECHNIC UNIV
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