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, chemical instruments and methods, organic chemistry, etc., and can solve the problems of complex process, high energy consumption, limited concentration range of auxiliary reagents and feed materials, etc. , to achieve the effects of reduced energy consumption, good separation performance, and low raw material cost

Inactive Publication Date: 2010-06-02
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

Experimental program
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Embodiment 1

[0027] 1) Synthesis of polyurethane-imide prepolymer

[0028] 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.

[0029] 2) Preparation of polyurethane-imide film ...

Embodiment 2

[0035] 1) Synthesis of polyurethane-imide prepolymer

[0036]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

A preparation method of a polyurethane-imide infiltrated and vaporized aromatic hydrocarbon and alkane separation membrane belongs to the infiltrated and vaporized membrane separation technical field.The factors of the prior polyurethanes membrane separation is low, and a plurality of the prior polyurethanes membrane separations need a test of an infiltrated and vaporized separation performance at high temperature. The present invention includes firstly a prepolymer synthesis of polyurethane and imide is that under the conditions of a nitrogen protection, a mechanical mixing and a condensation circumfluence, a terminated prepolymer is obtained by a reaction of poly (ethylene adipate) glycol diol and diisocyanate, and pyromellitic dianhydride is added for a chain extension to obtain the polyurethane-imide prepolymer solution; secondly the preparation of a polyurethane-imide membrane is that the solution casts to form the membrane and an impregnant is volatilized under an infrared light, and the preparation of membrane can be finished after a heat treatment of 150 DEG C for 1.5 to 2 hours. The material synthesis and the membrane-preparation process of the present invention are simple, and the prepared membrane has a good thermal and chemical stability, and the prepared membrane can separate an aromatic hydrocarbon and alkane mixture under a proper temperature condition with a good separation effect as well as with a considerable 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 Patents(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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