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Preparation and application of pH-responsive natural plant oil-water separation filter membrane

A vegetable oil, responsive technology, applied in the field of membrane separation, can solve the problems of insufficient resistance to liquid penetration, reduced practicability of filter membranes, low resistance to liquid penetration, etc. Effect

Active Publication Date: 2020-06-26
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 pH-responsive natural plant oil-water separation filter membrane
  • Preparation and application of pH-responsive natural plant oil-water separation filter membrane
  • Preparation and application of pH-responsive natural plant oil-water separation filter 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] like Figure 9 As shown, the treated wood membrane can switch its wettability to water under oil in acidic and ...

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 preparation and application of a pH-responsive natural plant oil-water separation filter membrane. Plant stalks are cut into proper thickness, subjected to ultrasonic extraction by using a solvent, soluble substances and chippings are removed, and drying is performed; then a wood membrane is immersed in silicone oil to be heated, the silicone oil is washed away with a solvent and drying is performed such that hydrophobicity is improved, and the water penetration resistance of the wood membrane is improved; a caustic alkali solution is used for swelling, dissolving andhydrolyzing the wood membrane , partially blocked grain holes and capillary channels are opened, so that the pH responsiveness and flux of the wood membrane are improved; acid is used for neutralizingand hydrolyzing the wood membrane so that the pH responsiveness of the wood membrane is further improved, and the filter membrane with sensitive pH responsiveness is obtained. The wood membrane is treated through the steps, so that the wood membrane has sensitive pH responsiveness to an alkaline solution, the flux and the water penetration resistance of the wood filter membrane are remarkably improved, and the practical separation filter membrane is obtained and used for separating a light oil (rho oil < rho water) / water / heavy oil (rho oil > rho water) 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 Applications(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
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