Polyether sulfone porous membrane for membrane distillation process and preparation method thereof

A polyethersulfone and porous membrane technology, applied in the field of porous membranes, can solve the problems of increasing the preparation cost of PES membrane distillation membranes, no public reports of membrane distillation membranes have been seen, and the performance has not reached the mainstream level, etc., to achieve excellent membrane distillation performance , Membrane distillation performance is stable, and membrane distillation performance is excellent

Active Publication Date: 2012-10-03
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

Unfortunately, although the modification treatment has improved the surface hydrophobicity of the PES-based porous membrane, its membrane distillation flux is not ideal. In fact, the performance of the PES-based membrane distillation membrane modified by the prior art has not been improved. Reach the current international mainstream level; moreover, plasma modification or blending modification both increase the preparation cost of PES membrane distillation membrane
So far, there has been no public report on the direct use of PES to prepare membranes for membrane distillation

Method used

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  • Polyether sulfone porous membrane for membrane distillation process and preparation method thereof
  • Polyether sulfone porous membrane for membrane distillation process and preparation method thereof
  • Polyether sulfone porous membrane for membrane distillation process and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This example shows the structural characteristics and membrane distillation desalination performance of dry PES porous membranes obtained under different drying conditions. First, configure the casting solution with the composition of PES 17wt.%, PVP 10wt.%, LiCl 3wt.%, DMAC 70wt.%. Scrape flat sheet-type liquid primary film on top, immerse in deionized water at 20°C to form a film after staying in the air for 15s. Among them, PES is E 6020P, the K value of PVP is 30. After film formation, the drying treatment was carried out by n-propanol displacement drying, isopropanol displacement drying, ethanol displacement drying and direct drying at room temperature, ambient relative humidity of 35%, and atmospheric pressure. use figure 1 The vacuum membrane distillation evaluation system shown tests the membrane distillation desalination performance of the above four dry PES porous membranes. Among them, the effective area of ​​the membrane filled in the membrane pool is 2...

Embodiment 2

[0054] This example provides the film thickness and membrane distillation desalination performance of the dry PES porous membrane when different solvents are selected. Using the same composition of casting solution, film-making conditions, raw material liquid composition, evaluation system and evaluation conditions as in Example 1, wherein the film-making solvents were selected from DMF, DMAC, NMP and DMSO, and the drying method was selected as direct drying. The liquid temperature was 65°C, and the pressure on the downstream side of the membrane was 16300Pa. The results are shown in Table 3. It can be seen from Table 3 that the PES porous membrane suitable for membrane distillation desalination can be prepared by using the above four solvents, and the membrane distillation desalination performance of the PES membrane obtained when DMAC is used as the solvent is the best, and the viscosity of the casting solution is relatively moderate , the film thickness is relatively the th...

Embodiment 3

[0058] This example shows the membrane distillation desalination performance of the PES porous membrane obtained with different casting solution compositions. Using the same film-making conditions, raw material liquid composition, evaluation system and evaluation conditions as in Example 1, the drying method is selected as isopropanol displacement drying, the feed liquid temperature is 70°C, the pressure on the downstream side of the membrane is 1300Pa, and the feed liquid The circulation flow rate is 600ml / min, and the results are shown in Table 4. It can be seen from Table 4 that changing the composition of the casting solution can significantly adjust the membrane distillation desalination performance of the prepared PES porous membrane. When the composition of casting solution is selected as PES 15wt.%, PVP 10wt.%, H 2 O 3wt.%, DMAC 72wt.%, the membrane distillation desalination performance of the PES porous membrane is relatively the best, using the membrane treatment te...

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Abstract

The invention provides a polyether sulfone porous membrane for a membrane distillation process and a preparation method of the polyether sulfone porous membrane, wherein before the polyether sulfone porous membrane for the membrane distillation process is prepared, no hydrophobic modification treatment on polyether sulfone body material is carried out, and no hydrophobic modification treatment on the membrane is carried out after membrane is prepared. The preparation method comprises the following steps: firstly preparing a wet polyether sulfone porous membrane by a lyotropic phase transformation method, and then drying the wet membrane so as to prepare the polyether sulfone porous membrane for the membrane distillation process. The polyether sulfone porous membrane provided by the invention has the advantages that membrane distillation flux is stable and high, the preparation method is mature and simple, the cost is low, the amplification is easy, and the application prospects in the fields such as desalination of seawater and bitter saline water, concentration of biological macromolecular solution and concentration of sugar-containing liquid are broad.

Description

field of invention [0001] The invention relates to a porous membrane used in a membrane distillation process, in particular to a polyethersulfone porous membrane used in a membrane distillation process and a preparation method thereof. Background technique [0002] Membrane distillation is a heat-driven membrane separation technology. It uses a hydrophobic porous membrane as the separation medium. On the premise that the processed material liquid does not wet the membrane pores, the processed material liquid (generally called "hot side") Volatile components pass through the membrane pores in the form of steam under the action of the vapor pressure difference on both sides of the membrane, and have a theoretical 100% rejection rate for non-volatile components (ions, biomacromolecules, colloids, sugars, etc.), so that Achieve separation between components. Therefore, membrane distillation technology has broad application potential in the desalination of seawater and brackish ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D67/00B01D61/36
Inventor 沈飞万印华闫会刘丽霞陈向荣
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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