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Reduced-pressure ultrafiltration membrane distillation device and reduced-pressure ultrafiltration membrane distillation method

A distillation device and ultrafiltration membrane technology, applied in the field of membrane separation, can solve the problems of membrane fouling, hydrophobic membrane hydrophilization leakage, membrane distillation flux and low mechanical strength of the membrane, etc.

Inactive Publication Date: 2017-01-11
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are many key problems in membrane distillation technology, one is due to the inevitable phenomenon of membrane fouling, there is unavoidable hydrophilization leakage of hydrophobic membrane in the membrane distillation process; Due to the limitation of the method, the membrane distillation flux and membrane mechanical strength are low, so this is a problem that must be solved for the industrial application of membrane distillation technology

Method used

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  • Reduced-pressure ultrafiltration membrane distillation device and reduced-pressure ultrafiltration membrane distillation method
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  • Reduced-pressure ultrafiltration membrane distillation device and reduced-pressure ultrafiltration membrane distillation method

Examples

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Embodiment 1

[0040] Embodiment 1, adopt as image 3 The decompression ultrafiltration membrane distillation device uses tap water as the raw material liquid, and enters the tube of the ultrafiltration membrane module from bottom to top. The conductivity of the tap water is 360μS / cm, and the temperature of the tap water is 60°C. (self-made, code name M-1) is used as the ultrafiltration membrane after wetting with ethanol, carries out the decompression ultrafiltration membrane distillation process, sets the height h of the vertical pipe section to be 15cm, and the vacuum negative pressure is 0.089MPa, and the membrane distillation flux that obtains is 15L / ㎡.h, the conductivity of membrane distillation water is 4.2μS / cm.

Embodiment 2

[0043] Example 2, using a hollow fiber ultrafiltration membrane module (self-made, code M-2), and the rest of the conditions are the same as Example 1. The obtained membrane distillation flux is 15L / ㎡.h, and the conductivity of membrane distillation water is 4.1μS / cm.

[0044] The pure water ultrafiltration membrane flux of the M-1 membrane module is 280L / ㎡.h@0.10MPa. The outer area of ​​the hollow fiber membrane of the M-2 membrane module and the M-1 membrane module is the same. The ultrafiltration membrane flux is 1080L / ㎡.h@0.10MPa, much higher than the M-1 membrane module. By comparison of Example 1 and Example 2, the membrane distillation flux has nothing to do with the pore size and ultrafiltration flux of the ultrafiltration membrane used.

Embodiment 3

[0045] Embodiment 3, adopt as Figure 4 The decompression ultrafiltration membrane distillation device uses tap water as the raw material liquid, which enters the tube side of the ultrafiltration membrane module from bottom to top. The conductivity of the tap water is 360μS / cm, the temperature of the tap water is 60°C, and the circulation velocity of the raw material liquid is 0.40m / S . The hydrophobic membrane module (self-made, code M-1) with an area of ​​0.05㎡ is wetted with ethanol and used as an ultrafiltration membrane to carry out the vacuum ultrafiltration membrane distillation process. The vertical pipe section height h is set to 15cm, and the vacuum negative pressure is 0.089MPa. The obtained membrane distillation flux is 22L / ㎡.h, and the conductivity of membrane distillation water is 4.2μS / cm. Through the circulation of the raw material liquid, it is beneficial to increase the temperature of the evaporated clear liquid, thereby increasing the flux of the membrane d...

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Abstract

The invention provides a reduced-pressure ultrafiltration membrane distillation device and a reduced-pressure ultrafiltration membrane distillation method. According to the device, a raw material liquid tank is connected with an ultrafiltration membrane assembly; an un-evaporated clear liquid outlet of the ultrafiltration membrane assembly is connected with a concentrated water collection tank; a distillation steam outlet of the ultrafiltration membrane assembly is connected with an external condenser; the external condenser is connected with a membrane distillation produced water collection tank; and the membrane distillation produced water collection tank is connected with a vacuum pump. The method comprises the following steps: the vacuum pump is started; under the effect of the vacuum pump, raw material liquid enters the ultrafiltration membrane assembly, and is subjected to ultrafiltration membrane filtration; evaporated steam enters the condenser through the membrane distillation steam outlet of the ultrafiltration membrane assembly; condensed membrane distillation produced water flows into the membrane distillation produced water collection tank; un-evaporated clear liquid flows into the concentrated water collection tank; and the concentrated water is discharged when reaches a certain volume. According to the invention, gas-liquid separation is realized with membrane module shell pass or tube pass space and with the effect of natural gravity, such that membrane distillation produced water with ultra-low conductivity is adopted. With the method, a hydrophobic membrane hydrophobic leakage problem can be avoided, and a high-efficiency membrane distillation process can be realized.

Description

technical field [0001] The invention relates to a membrane separation technology for high-salinity wastewater treatment, concentration and separation of chemical industry and medicine, and in particular to a vacuum ultrafiltration membrane distillation device and a method thereof. Background technique [0002] Membrane distillation technology is one of the research hotspots in the field of membrane technology in recent years. Compared with ordinary evaporators, one of the most notable features of membrane distillation is that the evaporation area per unit volume is large, so that the device can be evaporated at normal pressure and lower temperature. The process operates efficiently and requires little vapor space for the distillation operation. Compared with reverse osmosis, membrane distillation is a heat-driven process with low operating pressure, so the requirements for membrane mechanical properties are low, equipment costs are also low, and the safety of the separation ...

Claims

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Application Information

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IPC IPC(8): B01D61/36B01D63/00B01D63/02B01D63/06B01D63/08
Inventor 吕晓龙赵丽华刘冲刘治宇高启君武春瑞
Owner TIANJIN POLYTECHNIC UNIV
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