A kind of polyethersulfone porous membrane used in membrane distillation process and preparation method thereof

A technology of polyethersulfone and porous membrane, which is applied in the field of porous membrane, can solve the problems that there are no public reports of membrane distillation membranes, increase the cost of PES membrane distillation membrane preparation, and the performance has not reached the mainstream level, etc., and achieve excellent membrane distillation performance , Membrane distillation performance is stable, and membrane distillation performance is excellent

Active Publication Date: 2015-11-18
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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  • A kind of polyethersulfone porous membrane used in membrane distillation process and preparation method thereof
  • A kind of polyethersulfone porous membrane used in membrane distillation process and preparation method thereof
  • A kind of polyethersulfone porous membrane used in 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 film composition of PES17wt.%, PVP10wt.%, LiCl3wt.%, DMAC70wt.%, and scrape it flat on the polyester non-woven fabric under the conditions of room temperature, environmental relative humidity 35%, and film gap 250um. The sheet-type liquid nascent film forms a film after being immersed in deionized water at 20°C after staying in the air for 15 seconds. Among them, PES is E6020P, the K value of PVP is 30. After the film is formed, the drying treatment is carried out by using n-propanol replacement drying, isopropanol replacement drying, ethanol replacement drying and direct drying at room temperature, environmental relative humidity 35%, and atmospheric pressure. use figure 1 The shown vacuum membrane distillation evaluation system tests the membrane distillation desalinat...

Embodiment 2

[0054] This embodiment provides the film thickness of the dry PES porous membrane and its membrane distillation desalination performance when different solvents are selected. The same casting liquid composition, film forming conditions, raw material composition, evaluation system and evaluation conditions as in Example 1 were adopted. Among them, the membrane solvents were DMF, DMAC, NMP and DMSO, and the drying method was direct drying. The liquid temperature was 65°C, and the pressure on the downstream side of the membrane was 16,300 Pa. The results are shown in Table 3. It can be seen from Table 3 that the above four solvents can be used to prepare PES porous membranes suitable for membrane distillation desalination. Among them, the PES membrane obtained when DMAC is used as the solvent has the best membrane distillation desalination performance, and its casting solution viscosity is relatively moderate , The film thickness is relatively thinnest.

[0055] Table 3 PES casting...

Embodiment 3

[0058] This example shows the membrane distillation desalination performance of PES porous membranes obtained with different casting solutions. The same membrane production conditions, raw material liquid composition, evaluation system and evaluation conditions as in Example 1 were used. The drying method selected isopropanol replacement drying, the temperature of the feed liquid was 70 °C, the pressure on the downstream side of the membrane was 1300 Pa, 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 the casting liquid is selected as PES15wt.%, PVP10wt.%, H 2 When O3wt.% and DMAC72wt.%, the membrane distillation desalination performance of the PES porous membrane is relatively best. When the membrane is used to t...

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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

Invention field [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. Under the premise that the treated material does not wet the membrane pores, the treated material (generally referred to as the "hot side") Volatile components pass through the membrane pores in the form of vapor under the action of the vapor pressure difference on both sides of the membrane, while the non-volatile components (ions, biological macromolecules, colloids, sugars, etc.) have a theoretical 100% rejection rate, thus Achieve separation between components. Therefore, membrane distillation technology has broad application potential in the fields of seawater and brackish water desa...

Claims

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Application Information

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Patent Type & Authority Patents(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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