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Preparation and application of a pH-responsive natural vegetable oil-water separation membrane

A vegetable oil and responsive technology, which is applied in the field of membrane separation, can solve the problems of reducing the practicability of the filter membrane, insufficient resistance to liquid breakthrough, and small resistance to liquid breakthrough, and achieves increased pH response, improved resistance to liquid breakthrough, and resistance to Improvement of liquid penetration ability and responsiveness

Active Publication Date: 2022-03-18
PINGDINGSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the pH-responsive membrane, when it is applied to the separation of three-phase oil-water mixture, too small flux will lead to too long separation time, and too small anti-liquid breakthrough ability will easily lead to pressure leakage of the membrane, which will significantly reduce the filtration efficiency of the membrane. practicality
Since the infusion pipelines of the wood membrane are mainly tracheids, pits and capillaries, the thinner the wood membrane is, the more the tracheids are opened, and the corresponding flux will be higher, but it will lead to insufficient liquid penetration resistance and insufficient mechanical strength; The thicker the wood film, the stronger the liquid penetration resistance of the wood film, and the flux will decrease accordingly

Method used

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  • Preparation and application of a pH-responsive natural vegetable oil-water separation membrane
  • Preparation and application of a pH-responsive natural vegetable oil-water separation membrane
  • Preparation and application of a pH-responsive natural vegetable oil-water separation membrane

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preparation example Construction

[0063] The pH-responsive natural vegetable oil-water separation filter membrane provided by the present invention and its preparation method specifically include the following steps:

[0064] (1) Use a circular saw to cut the plant stem into a wood film with a diameter of 1-10 cm and a thickness of 0.5-3 mm.

[0065] The stem is paulownia, pine, cypress, fir, poplar, willow, basswood, elm or basswood.

[0066] (2) After using 20ml of solvent for ultrasonic extraction for a certain period of time, dry at 60°C for 30min.

[0067] The washing solvent is any one of methanol, ethanol, acetone, propanol, tetrahydrofuran or isopropanol, each time is 5 min, and the number of times is 3 times.

[0068] (3) The treated wood film was heated in silicone oil, and the silicone oil was washed with 20 ml of solvent each time, washed three times, and dried at 60° C. for 30 minutes.

[0069] The silicone oil is any one of methyl silicone oil, dimethyl silicone oil, phenyl methyl silicone oil ...

Embodiment 1

[0077] Preparation of a pH-responsive natural vegetable oil-water separation membrane:

[0078] 1. Use a wood saw to cut the fir into a wood film with a diameter of 3mm and a thickness of 1.0mm.

[0079] 2. Ultrasonic extraction of wood film in ethanol, the amount of extraction solvent is 20ml, each ultrasonic time is 5min, the number of times is 3 times, and it is dried at 60°C for 30min.

[0080] 3. Then heat in 80°C silicone oil for 2h, wash the silicone oil with 20ml of dimethyl ether each time, wash 3 times, and dry at 60°C for 30min.

[0081] 4. Finally, use 0.2mol / L NaOH solution to soak at room temperature for 10 minutes, and use 0.2mol / L hydrochloric acid for 10 minutes, and dry for 2 hours to obtain the pH-responsive fir oil-water separation filter membrane.

[0082] Application of a pH-responsive natural vegetable oil-water separation membrane:

[0083] Such as Figure 9 As shown, the treated wood membrane can switch its wettability to water under oil in acidic a...

Embodiment 2

[0085] Preparation of a pH-responsive natural vegetable oil-water separation membrane:

[0086] 1. Use a wood saw to cut Paulownia into a wood film with a diameter of 4mm and a thickness of 1.5mm.

[0087] 2. Ultrasonic extraction of wood film in acetone, the amount of extraction solvent is 20ml, each ultrasonic time is 5min, the number of times is 3 times, and it is dried at 60°C for 30min.

[0088] 3. Then heat in silicone oil at 100°C for 1.5h, wash the silicone oil with 20ml of methyl ethyl ketone each time, wash three times, and dry at 60°C for 30min.

[0089] 4. Finally, use 0.5mol / L NaOH solution to soak at room temperature for 15 minutes, and use 0.5mol / L hydrochloric acid to soak for 15 minutes, and dry for 2 hours for the controllable separation of light oil / water / heavy oil three-phase oil-water mixture.

[0090] Application of a pH-responsive natural vegetable oil-water separation membrane:

[0091]The filter membrane prepared by the above method is clamped betwee...

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Abstract

The invention relates to the preparation and application of a pH-responsive natural vegetable oil-water separation filter membrane. The plant stem is cut into an appropriate thickness, ultrasonically extracted with a solvent, and dried after removing soluble substances and debris; then the wood membrane is soaked in silicone oil Medium heating, using a solvent to wash away the silicone oil and drying, increasing the hydrophobicity and improving the water penetration resistance of the wood film; using a caustic solution to swell, dissolve and hydrolyze the wood film, and partially blocked pits and capillaries are opened to improve the wood film. The pH responsiveness and flux of the membrane, using acid to neutralize and hydrolyze the wood membrane, further improve the pH responsiveness of the wood membrane, and obtain a filter membrane with sensitive pH responsiveness. Through the above steps, the wood membrane is treated to make it sensitive to pH responsiveness to alkaline solutions, and significantly improve the flux and water penetration resistance of the wood membrane, and obtain a practical separation membrane for the separation of light oil (ρ 油 <ρ 水 ) / water / heavy oil (ρ 油 ﹥ρ 水 ) three-phase oil-water mixture.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to the preparation and application of a pH-responsive natural vegetable oil-water separation filter membrane. Background technique [0002] Frequent occurrence of oil spill accidents in oil exploration and marine transportation, and illegal discharge of oily (solvent) sewage from factories and mines. Long-term siltation of sewage will block the pipelines of enterprises, and direct discharge will cause waste of resources, and will seriously damage the ecological environment such as water resources and soil, and even affect the healthy life of human beings. Compared with traditional oil-water separation methods, the use of surface superwetability to separate oil-water mixtures has the advantages of simple equipment, low energy consumption, and high separation efficiency, which makes this technology one of the hotspots in material science research. [0003] In recent years...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/10B01D67/00C02F1/40
CPCB01D71/10B01D67/0088C02F1/40B01D2325/38B01D2325/24
Inventor 周延彪曲凯歌陈昌东张立会罗晓强廖秉华
Owner PINGDINGSHAN UNIVERSITY