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Polyimide composite membrane for pervaporation treatment of high concentration brine and preparation method thereof

A technology of polyimide and composite membrane, which is applied in osmosis/dialysis water/sewage treatment, chemical instruments and methods, seawater treatment, etc., to achieve good chemical stability, improve water flux, and reduce separation steps

Inactive Publication Date: 2018-12-18
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no report on the preparation of MWCNTs / PI composite membrane by interfacial polymerization technology and its use in pervaporation treatment of high brine

Method used

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  • Polyimide composite membrane for pervaporation treatment of high concentration brine and preparation method thereof
  • Polyimide composite membrane for pervaporation treatment of high concentration brine and preparation method thereof
  • Polyimide composite membrane for pervaporation treatment of high concentration brine and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 10.4g of pyromellitic anhydride and 21.3g of phosphorus pentachloride in a flask, and heat, stir and reflux at 160°C for 10h. Distill under reduced pressure at 120°C to remove excess phosphorus pentachloride and phosphorus oxychloride, dissolve and recrystallize in dichloromethane to obtain pure pyromellitic chloride.

[0034] Prepare a sodium hydroxide solution with a concentration of 2 mol / L, and soak the PAN film for 1 hour at a temperature of 60°C.

[0035] Place the soaked H-PAN base film in the sand core funnel, pipette 5ml of the prepared and ultrasonically dispersed 0.02g / LMWCNTs-OH / EtOH solution into the sand core funnel, and use a vacuum pump to pump at 0.1MPa. Filter to fill the MWCNTs-OH to the H-PAN bottom membrane.

[0036] Prepare 1wt% m-phenylenediamine aqueous phase solution, add 0.4g sodium lauryl sulfate, 0.1g sodium hydroxide and 0.3g sodium carbonate; prepare 0.05wt% pyromellitic chloride n-hexane organic phase solution. Soak the pretreated ...

Embodiment 2

[0043] Weigh 9.2g of pyromellitic anhydride and 19.8g of phosphorus pentachloride in a flask, and heat, stir and reflux at 160°C for 10h. Distill under reduced pressure at 120°C to remove excess phosphorus pentachloride and phosphorus oxychloride, dissolve and recrystallize in dichloromethane to obtain pure pyromellitic chloride.

[0044] Prepare a sodium hydroxide solution with a concentration of 2 mol / L, and soak the PAN film for 1 hour at a temperature of 60°C.

[0045] Place the soaked H-PAN base film in the sand core funnel, pipette 40ml of the 0.02g / LMWCNTs-OH / EtOH solution prepared and dispersed by ultrasonic waves into the sand core funnel, and use a vacuum pump to pump at 0.1MPa. Filter to fill the MWCNTs-OH to the H-PAN bottom membrane.

[0046] Prepare 2wt% hexamethylenediamine aqueous phase solution, add 0.25g sodium dodecylbenzenesulfonate and 0.3g potassium carbonate to prepare 0.1wt% pyromelliticoyl chloride n-hexane organic phase solution. Soak the pretreated...

Embodiment 3

[0052] Weigh 14.2 g of pyromellitic anhydride and 33.6 g of phosphorus pentachloride in a flask, and heat, stir and reflux at 160° C. for 10 h. Distill under reduced pressure at 110°C to remove excess phosphorus pentachloride and phosphorus oxychloride, dissolve and recrystallize in dichloromethane to obtain pure pyromellitic acid chloride.

[0053] Prepare a sodium hydroxide solution with a concentration of 2 mol / L, and soak the PAN film for 1 hour at a temperature of 60°C.

[0054] Place the soaked H-PAN base film in the sand core funnel, pipette 10ml of the prepared and ultrasonically dispersed 0.02g / LMWCNTs-OH / EtOH solution into the sand core funnel, and pump it with a vacuum pump at 0.1MPa. Filter to fill the MWCNTs-OH into the H-PAN bottom membrane.

[0055] Prepare 3wt% propylenediamine aqueous phase solution, wherein add 0.1g sodium alkylbenzenesulfonate, 0.1g salt of wormwood and 0.15g sodium carbonate, prepare 0.2wt% pyromellitic acid chloride n-hexane organic phase...

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Abstract

Belonging to the seawater desalination field, the invention in particular relates to a preparation method of a polyimide composite membrane for pervaporation treatment of high concentration brine. Thepreparation method includes: filling a PAN base membrane with MWCNTs-OH by a vacuum water pump, and then employing interfacial polymerization to obtain the polyimide composite membrane. The preparedcomposite membrane mainly consists of three layers, the first layer is an ultra-thin polyimide separation layer with separation function, the second layer is a vacuum filtration filled MWCNTs sub-layer, and the third layer is an organic porous base membrane layer playing a support role. The composite membrane is used for pervaporation desalination of high concentration brine, and has good brine retention rate and water flux. Pervaporation is employed for desalination of high concentration brine, thus lowering the operating pressure and alleviating the damage of the desalination process to equipment.

Description

technical field [0001] The invention belongs to the field of seawater desalination, and in particular relates to a polyimide composite membrane with an ultra-thin separation layer for pervaporation desalination of high-concentration brine and a preparation method. Background technique [0002] With the rapid development of world population and urbanization, water scarcity has become one of the major challenges facing society today. Desalination technology is one of the effective ways to solve the problem. Membrane technology is generally considered to be the most attractive solution for desalination due to its high efficiency and potential energy savings compared to conventional distillation techniques. The most mature and relatively low-cost seawater desalination membrane technology is reverse osmosis (RO). In recent years, non-pressure-driven membrane processes such as pervaporation (PV) have been found to be more attractive in terms of handling high total dissolved soli...

Claims

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Application Information

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IPC IPC(8): B01D61/36B01D67/00B01D69/02B01D69/12B01D71/02B01D71/42B01D71/64C02F1/04C02F1/44C02F103/08
CPCB01D61/362B01D67/0079B01D69/02B01D69/12B01D71/021B01D71/42B01D71/64B01D2325/36C02F1/04C02F1/44C02F2103/08Y02A20/124Y02A20/131
Inventor 马文中钟璟蒋超徐荣张琪
Owner CHANGZHOU UNIV
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