Method for preparing polyurethane-imide permeable vaporizing aromatic/alkane separating membrane

A technology of polyurethane imide and pervaporation, which is applied in the purification/separation of hydrocarbons, semi-permeable membrane separation, chemical instruments and methods, etc. It can solve the problems of complex process, high investment cost, and large energy consumption, and achieve raw material cost Effects of low cost, reduced energy consumption, and good separation performance

Inactive Publication Date: 2008-02-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the industrial separation of aromatics / alkanes usually adopts three processes: azeotropic distillation, extractive distillation and liquid-liquid extraction. These traditional processes generally have high energy consumption, high investment costs, and complicated processes. Disadvantages such as limited range of auxiliary reagents and feed concentrations

Method used

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  • Method for preparing polyurethane-imide permeable vaporizing aromatic/alkane separating membrane
  • Method for preparing polyurethane-imide permeable vaporizing aromatic/alkane separating membrane

Examples

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Embodiment 1

[0028] 1) Synthesis of polyurethane-imide prepolymer

[0029] Add polyethylene adipate glycol (PEA) 10g (before use through 110 ℃ dehydration treatment under reduced pressure) and diphenylmethane diisocyanate ( MDI) monomer (the number of moles of MDI is twice that of PEA), make it react for 1.5 hours under the conditions of vigorous stirring and heating in a water bath at 80°C to obtain an MDI-capped prepolymer, and add It was diluted with 7ml of N,N-dimethylformamide (DMF) (purified by distillation under reduced pressure before use). Then add 1.1g pyromellitic dianhydride (purified by sublimation under reduced pressure before use) and other 7ml DMF to the solution of the end-capped prepolymer with polyethylene adipate diol equimolar equivalent, and The reaction temperature was raised to 85° C. for 2 hours to carry out the chain extension reaction, and finally a viscous polyurethane-imide prepolymer solution was obtained.

[0030] 2) Preparation of polyurethane-imide film ...

Embodiment 2

[0036] 1) Synthesis of polyurethane-imide prepolymer

[0037]Add polyethylene adipate glycol (PEA, molecular weight 1000g / mol) 10g (dehydration under reduced pressure at 110°C before use) and 2 , 4-toluene diisocyanate (TDI, isomerization ratio 80 / 20) monomer (the molar number of TDI is 2 times that of PEA), make it react under the conditions of vigorous stirring and 65 ℃ water bath heating for 2 hours, obtain TDI seal The end-capped prepolymer was added to the end-capped prepolymer by adding 7ml of N,N-dimethylformamide (DMF) (purified by vacuum distillation before use) to dilute it. Then add 1.1g pyromellitic dianhydride (purified by sublimation under reduced pressure before use) and other 7ml DMF to the solution of the end-capped prepolymer with polyethylene adipate diol equimolar equivalent, and The reaction temperature was raised to 95° C. for 3 hours to carry out the chain extension reaction, and finally a viscous polyurethane-imide prepolymer solution was obtained.

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Abstract

The invention relates to a preparation method of polyurethane imide pervaporation aromatic hydrocarbon/alkane separation membrane, which belongs to the technical field of pervaporation membrane separation. The existing polyurethane membranes have low separation factors, and most of them need to be tested for pervaporation separation performance at high temperature. The present invention includes 1) synthesis of polyurethane-imide prepolymer: under the conditions of nitrogen protection, mechanical stirring and condensing reflux, react polyethylene adipate diol with diisocyanate to obtain a blocked prepolymer , and then add pyromellitic dianhydride for chain extension to obtain a polyurethane-imide prepolymer solution; 2) Preparation of polyurethane-imide film: the solution is cast into a film and the solvent is volatilized under an infrared lamp, and then the Heat treatment at 150°C for 1.5-2 hours. The material synthesis and membrane-making process of the present invention are simple, and the prepared membrane has good thermal and chemical stability, and has a good separation effect on aromatic hydrocarbon/alkane mixed liquid under warm conditions, and has great practical value .

Description

Technical field: [0001] The invention relates to a preparation method of a polyurethane-imide membrane that can be used for the separation of pervaporation aromatics / alkanes, and belongs to the technical field of pervaporation membrane separation. Background technique: [0002] The separation of aromatic / alkane mixtures is of great significance in the field of petrochemical industry. Especially in recent years, with the strengthening of people's awareness of environmental protection, countries around the world have formulated standards to limit the content of aromatics in fuel gasoline to avoid environmental pollution and damage to public health. The World Fuel Specification III requires the content of aromatics in gasoline ≤35%, China has also formulated a new fuel oil standard requiring the aromatics content in gasoline to be ≤40%, and these standards and requirements will become more stringent as technology advances; in addition, from the perspective of chemical productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64C07C7/00
Inventor 李继定叶宏陈剑林阳政
Owner TSINGHUA UNIV
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