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Template-Free Preparation of Hierarchical Porous Polymers for Oil-Water Mixture and Emulsion Separation

A technology for the separation of oil-water mixtures and emulsions, which can be used in separation methods, liquid separation, immiscible liquid separation, etc. It can solve the problems of reduced separation efficiency and clogging, and achieves extended service life, expanded application range, and excellent superhydrophobicity. Effect

Active Publication Date: 2018-06-08
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The preparation method of the present invention is green and simple, and the obtained multi-level porous polymer can be ground arbitrarily, has good mechanical strength and can be recycled, and solves the problem of clogging of micropores and pollution caused by emulsion when the filter-type demulsification omentum is used for many times. The separation efficiency is greatly reduced due to the omentum, thus effectively prolonging the service life of the material

Method used

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  • Template-Free Preparation of Hierarchical Porous Polymers for Oil-Water Mixture and Emulsion Separation
  • Template-Free Preparation of Hierarchical Porous Polymers for Oil-Water Mixture and Emulsion Separation

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Experimental program
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Effect test

Embodiment 1

[0020] Silicon dioxide 0.1 g

[0021] divinylbenzene 2.5 g

[0022] Ethyl acetate 30 mL

[0023] Azobisisobutyronitrile 0.07 g

[0024] Water heating temperature 120°C

[0025] Reaction time 18 hours

[0026] Solvent evaporation temperature 25°C

[0027] Weigh each component according to the above ratio, first disperse the nano silicon dioxide into the solvent, ultrasonic time is 10 min, then the monomer divinylbenzene, initiator azobis Isobutyronitrile was added to the above mixture and stirred for 2 h to form a prepolymer solution. Then the above pre-polymerization solution was transferred to a 100 mL polytetrafluoroethylene liner, and the temperature was raised to 120 °C at a rate of 5 °C / min for hydrothermal reaction for 18 h. After the reaction is completed, cool to room temperature and completely evaporate the solvent in an environment of 25° C. to obtain a hierarchically porous superhydrophobic polymer monolith. Its measurement of its contact angle is greater tha...

Embodiment 2

[0029] Silica 0.2 g

[0030] divinylbenzene 2.5 g

[0031] Ethyl acetate 32 mL

[0032] Azobisisobutyronitrile 0.07 g

[0033] Water heating temperature 110°C

[0034] Reaction time 20 hours

[0035] Solvent evaporation temperature 30°C

[0036] Weigh each component according to the above ratio, first disperse the nano silicon dioxide into the solvent, ultrasonic time is 20 min, and then the monomer divinylbenzene, the initiator azobis Isobutyronitrile was added to the above mixture and stirred for 3 h to form a prepolymer solution. Then the above pre-polymerization solution was transferred to a 100 mL polytetrafluoroethylene liner, and the temperature was raised to 110 °C at a rate of 5 °C / min for hydrothermal reaction for 20 h. After the reaction is completed, cool to room temperature and completely evaporate the solvent in an environment of 30° C. to obtain a hierarchically porous superhydrophobic polymer monolith. It measures that its contact angle is greater than 1...

Embodiment 3

[0038] Silica 0.4 g

[0039] Divinylbenzene 6.0 g

[0040] Ethyl acetate 80 mL

[0041] Azobisisobutyronitrile 0.15 g

[0042] Water heating temperature 110°C

[0043] Response time 24 hours

[0044] Solvent evaporation temperature 30-40°C

[0045] Weigh each component according to the above ratio, first disperse the nano silicon dioxide into the solvent, ultrasonic time is 20 min, and then the monomer divinylbenzene, the initiator azobis Isobutyronitrile was added to the above mixture and stirred for 5 h to form a prepolymer solution. Then the above pre-polymerization solution was transferred to a 200 mL polytetrafluoroethylene liner, and the temperature was raised to 110 °C at a rate of 5 °C / min for hydrothermal reaction for 24 h. After the reaction is completed, cool to room temperature and completely evaporate the solvent in an environment of 30-40° C. to obtain a hierarchically porous superhydrophobic polymer monolithic material. It is measured that its contact ang...

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Abstract

The invention discloses a template-free preparation method for a multi-porous polymer for separating oil water mixtures and emulsions. The method comprises the following steps: adding divinyl benzene, nano-silicon dioxide and azodiisobutyronitrile into ethyl acetate, mixing and forming a pre-polymerization solution; causing the pre-polymerization solution react under a hydrothermal condition; lastly, volatilizing solvent. The template-free preparation method has the characteristics that ethyl acetate is taken as solvent as well as pore-foaming agent and the use and post-treatment of template are avoided; the multi-porous structure and the low-surface energy and multi-scale coarse structure are realized in one step in the in-situ polymerization process; the acquired material has high multi-porous structure, ultrahigh specific area, pore volume and excellent super-hydrophobic lipophilicity; the material not only can be used for separating the conventional oil water mixtures but also can be used for separating various oil-in-water type and water-in-oil type emulsions at nano-scale / submicron scale; the raw materials according to the invention are low in cost, the preparation condition is mild, no complex equipment is required and the use and removal of the template are avoided.

Description

technical field [0001] The invention relates to a template-free preparation method of a hierarchical porous polymer used for the separation of oil-water mixtures and emulsions. Specifically, the hierarchical porous structure and superhydrophobicity are introduced into the polymer system during the hydrothermal polymerization process, thereby obtaining Materials with highly porous structure, high specific surface area, pore volume and excellent superhydrophobic and superlipophilic properties. The hierarchical porous material can be applied to the field of oil-water separation, especially oil-water emulsion separation. Background technique [0002] The increasingly serious water pollution caused by a large amount of industrial sewage and frequent oil spills endangers the environment on which human beings depend. Due to the requirements of environment and economic development, it is urgent to find an efficient and economical way to remove oil or organic pollutants in sewage. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F212/36C08J9/28B01D17/022B01D17/04
CPCB01D17/02B01D17/045C08F292/00C08J9/28C08J2201/0502C08J2351/10C08F212/36
Inventor 张招柱李永葛博
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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