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Membrane distillation desalination method and apparatus thereof

A desalination device and membrane distillation technology, applied in the field of separation process, can solve problems such as hydrophilization leakage, membrane material resistance to high temperature, pollution, etc., and achieve the effects of prolonging service life, good hydrophobic performance, and large membrane area

Inactive Publication Date: 2016-11-09
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to obtain high throughput and desalination rate of the membrane distillation desalination process, solve the situation that the membrane material is not resistant to high temperature in the harsh system, and avoid the hydrophilization leakage of the membrane material in the process and the membrane fouling in the membrane distillation process question

Method used

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  • Membrane distillation desalination method and apparatus thereof
  • Membrane distillation desalination method and apparatus thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] (1) The 19-channel ceramic membrane material is hydrophobically modified by surface grafting modification. Fully stir evenly at 35°C and normal pressure. After the modification solution was reacted for 5 h, the ceramic membrane was placed in the prepared modification solution and vacuumized. After the reaction was complete and no air bubbles were generated on the surface, the ceramic membrane was washed three times with deionized water and ethanol, placed in an oven, and dried at 120 °C for 4 h to obtain a ceramic membrane with good hydrophobic properties.

[0042] (2) Prepare a brine solution with a concentration of 35 g / L and pour it into the raw material tank of membrane distillation for heating;

[0043] (3) After reaching the set 75°C, turn on the feed liquid pump, and turn on the vacuum pump after the system temperature is stable, and set the vacuum degree to 0.095 MPa;

[0044] (4) The membrane distillation system starts to work, the feed liquid flow rate is 16...

Embodiment 2

[0048] (1) The 37-channel ceramic membrane material is hydrophobically modified by surface grafting modification. Stir fully and evenly at 50°C and normal pressure. After the modification solution was reacted for 12 h, the ceramic membrane was placed in the prepared modification solution and vacuumized. After the reaction was complete and no air bubbles were generated on the surface, the ceramic membrane was washed three times with deionized water and ethanol, placed in an oven, and dried at 120 °C for 4 h to obtain a ceramic membrane with good hydrophobic properties.

[0049] (2) Prepare a brine solution with a concentration of 200 g / L and pour it into the raw material tank of membrane distillation for heating;

[0050] (3) After reaching the set 55°C, turn on the feed liquid pump, and turn on the vacuum pump after the system temperature is stable, and set the vacuum degree to 0.085 MPa;

[0051] (4) The membrane distillation system starts to work, the feed liquid flow rate...

Embodiment 3

[0055] (1) The 61-channel ceramic membrane material is hydrophobically modified by surface grafting modification. Fully stir evenly at 70°C and normal pressure. After the modification solution was reacted for 2 h, the ceramic membrane was placed in the prepared modification solution and vacuumized. After the reaction was complete and no air bubbles were generated on the surface, the ceramic membrane was washed three times with deionized water and ethanol, placed in an oven, and dried at 120 °C for 4 h to obtain a ceramic membrane with good hydrophobic properties.

[0056] (2) Prepare a brine solution with a concentration of 120 g / L, pour it into the raw material tank of membrane distillation for heating;

[0057] (3) After reaching the set 70°C, turn on the feed liquid pump, and turn on the vacuum pump after the system temperature is stable, and set the vacuum degree to 0.095 MPa;

[0058] (4) The membrane distillation system starts to work, the feed liquid flow rate is 40 L...

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Abstract

The invention relates to a membrane distillation desalination separating technology by employing a multichannel ceramic membrane. By using an organic matter surface grafted modification method, the hydrophilic-hydrophobic property on the surface of the multichannel ceramic membrane is regulated and controlled, and the ceramic membrane with good hydrophobicity is prepared. The modified ceramic membrane is used for a desalination process of the membrane distillation, water molecules in the raw material liquid permeate the membrane holes as a steam form, wherein, substances such as inorganic salt and macro-molecules are intercepted, so that the separating and purifying effects are achieved, the treating capacity of the multichannel ceramic membrane is obviously higher than that in the membrane distillation process of the common organic membrane material, and the desalination rate is more than 99.9%. During the membrane distillation desalination process, the usage of the multichannel ceramic membrane material provides high mechanical strength and chemical stability as well as develops an application of the hydrophobic membrane material in the field.

Description

technical field [0001] The invention relates to a membrane distillation desalination method and device, belonging to the technical field of separation processes. Background technique [0002] The scarcity of water resources is a worldwide problem. Many countries are facing the current situation of water shortage and water pollution. This has become one of the important factors restricting the sustainable development of economy and society, and also seriously threatens the survival of human beings. The average annual water shortage in my country is as high as more than 50 billion cubic meters, which is close to the edge of water resource crisis. Brackish water treatment, zero discharge of reverse osmosis concentrated water, seawater desalination and other technologies are all effective means to alleviate the water crisis, and most of them involve deep desalination of high-salt wastewater. The waste water will cause serious pollution to the soil and groundwater, and at the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36C02F1/44C02F1/04
CPCB01D61/364B01D61/366C02F1/447Y02W10/37Y02A20/131Y02A20/124
Inventor 范益群熊峰邱鸣慧兰清泉
Owner NANJING UNIV OF TECH
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