Nanofiber membrane for membrane distillation and preparation method of nanofiber membrane

A nanofiber membrane and nanofiber technology, which is applied in the field of membrane distillation, can solve the problems that the long-term stable operation of the membrane distillation process cannot be guaranteed, the hydrophobic performance of the membrane is unstable, and the flux of the membrane membrane is not ideal. Excellent effect with simple preparation method

Active Publication Date: 2017-06-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of complex steps and special equipment in the membrane distillation preparation method in the prior art, unsatisfactory membrane flux of the prepared membrane, unstable membrane hydrophobicity and inability to ensure long-term stable operation of the membrane distillation process, the present invention provides a A nanofibrous membrane with superhydrophobic properties for membrane distillation and preparation method thereof

Method used

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  • Nanofiber membrane for membrane distillation and preparation method of nanofiber membrane

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Effect test

Embodiment 1

[0054] This embodiment adopts as figure 1 The shown device carries out the preparation of the nanofiber membrane used for membrane distillation, and described device comprises electrospinning solution 1, electrospinning device 2, electrospinning power supply 3, receiving device 4, electrostatic spraying power supply 5, electrostatic spraying device 6 and Electrostatic spray liquid7.

[0055] The preparation method is as follows:

[0056] (1) Dissolving 20 parts of polyvinylidene fluoride in 24 parts of acetone and 56 parts of dimethylacetamide to prepare an electrospinning solution;

[0057] (2) 5 parts of hydrophobic nano-silicon dioxide are uniformly dispersed in 95 parts of dimethylformamide to prepare a spray liquid;

[0058] (3) The electrospinning solution prepared in step (1) is packed into the electrospinning device, and the spray solution prepared in step (2) is packed into the electrostatic spray device, and the consumption ratio of the spray solution and the elect...

Embodiment 2

[0061] In this embodiment, the following method is used to prepare nanofiber membranes for membrane distillation:

[0062] (1) Dissolving 25 parts of polyvinylidene fluoride in 75 parts of dimethylacetamide to prepare an electrospinning solution;

[0063] (2) 10 parts of hydrophobic nano-silica are uniformly dispersed in 90 parts of dimethylformamide to prepare a spraying liquid;

[0064] (3) The electrospinning solution prepared by step (1) is loaded into the electrospinning device, and the spraying solution prepared by step (2) is packed into the air spraying device, and the consumption ratio of the spraying solution and the electrospinning solution is 1 :2, set the electrospinning liquid injection flow rate to 2.0ml h -1 , set the injection flow rate of the air spraying device to 0.8ml h -1 ; Set the spinning voltage as 10kV, the receiving distance of the receiver as 15cm, and the spraying distance between the air spraying device and the receiver as 10cm. The electrospin...

Embodiment 3

[0067] In this embodiment, the following method is used to prepare nanofiber membranes for membrane distillation:

[0068] (1) Dissolving 20 parts of polyvinylidene fluoride in 85 parts of dimethylacetamide to prepare an electrospinning solution;

[0069] (2) uniformly dispersing 15 parts of hydrophobic nano silicon dioxide in 90 parts of dimethylformamide to prepare a spraying liquid;

[0070] (3) The electrospinning solution prepared in step (1) is loaded into the electrospinning device, and the spraying solution prepared in step (2) is loaded into the electrostatic spraying device, and the consumption ratio of the spraying solution and the electrostatic spinning solution is 1 :20, set the electrospinning liquid injection flow rate to 2.0ml h -1 , set the injection flow rate of electrostatic spraying liquid to 0.8ml h -1 ; Set the spinning voltage as 15kV, the receiving distance of the receiver as 20cm, the spraying distance between the electrostatic spraying device and th...

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Abstract

The invention provides a nanofiber membrane for membrane distillation and a preparation method of the nanofiber membrane. The nanofiber membrane consists of nanofibers and nano branch structures distributed on the nanofibers. According to the method, a spraying (or atomizing) technology and an electrostatic spinning technology can be simply implemented synchronously, and the nanofiber membrane with superhydrophobic property for membrane distillation is prepared in a combined manner. The preparation method is simple, the process is easy to control, complicated preparation steps and expensive post treatment equipment are not required, the prepared nanofiber membrane is high in porosity, the surface of the membrane has uniform and excellent super-hydrophobicity, the plane, which is formed by the nanofibers, of each layer in the nanofiber membrane has the super-hydrophobicity, and therefore, the wetting resistance of the membrane can be greatly improved. The problems of low membrane flux and easiness in wetting are solved effectively.

Description

technical field [0001] The invention belongs to the field of membrane distillation, and relates to a nanofiber membrane for membrane distillation and a preparation method thereof, in particular to a nanofiber membrane for membrane distillation with superhydrophobicity and a preparation method thereof. Background technique [0002] Membrane distillation is a new liquid separation technology that combines the traditional distillation process with membrane separation technology. It uses the vapor pressure difference generated by the temperature difference between the two membranes to drive water vapor to pass through the hydrophobic membrane and condense on the low temperature side. , while the water and non-volatile components at the liquid end of the raw material are intercepted to achieve material separation. Due to the advantages of extremely high salt interception rate and the ability to utilize low-grade energy and waste heat, it has great application potential in the fie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D01D5/00D04H1/4282
CPCD01D5/0007D04H1/4282D04H1/728
Inventor 李玉平苏春雷曹宏斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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