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Preparation method of modified polyurethane pervaporation phenol/water separation membrane

A technology of pervaporation and polyurethane, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of low flux, low permeation flux, difficult to treat phenol-containing wastewater, and achieve low cost, The effect of ensuring mechanical strength and good comprehensive separation performance

Inactive Publication Date: 2012-10-24
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Das (Das S, Banthia AK, Adhikari B, Porous polyurethane ureamembranes for pervaporation separation of phenol and chlorophenols from water.Chem.Eng.J.) also used traditional chain extenders to obtain polyurethane films, and added porogens to the formula to Increase the flux of the membrane, but in general, the permeation flux of the membrane is low, not exceeding 80g / m 2 h
[0015] Das (Das S, Banthia AK, Adhikari B. Pervaporation separation ofaqueous chlorophenols by a novel polyurethane urea-poly(methylmethacrylate) interpenetrating network membrane. J Membr Sci, 2006) is also studying another polymer blended into polyurethane materials , a blend membrane of two polymers was prepared for the separation of chlorophenols in water. Although the separation factor reached tens of thousands, the flux was extremely low, and it was difficult to apply to the treatment of phenolic wastewater in industry.

Method used

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  • Preparation method of modified polyurethane pervaporation phenol/water separation membrane
  • Preparation method of modified polyurethane pervaporation phenol/water separation membrane
  • Preparation method of modified polyurethane pervaporation phenol/water separation membrane

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Embodiment 1

[0029] 1) Synthesis of modified polyurethane

[0030] Add 10.9g of hydroxyl-terminated polybutadiene (number average molecular weight is 2500g / mol, after 110℃ vacuum dehydration treatment before use) and 10ml N, N into a 150ml three-necked flask equipped with nitrogen protection, mechanical stirring and reflux tube. -Dimethylacetamide (purified by vacuum distillation before use), after the two form a uniform solution under stirring, then 1.59g of toluene diisocyanate monomer (mole number is 2 times that of hydroxyl-terminated polybutadiene) ) And 0.02 g of dibutyltin dilaurate as a catalyst (the mass is 0.2% of the mass of the hydroxyl-terminated polybutadiene) were added to the above solution and reacted for 1 hour under the conditions of vigorous stirring and heating in a water bath at 30°C to obtain a diisocyanate-terminated Prepolymer; then 0.44g 4,4'-diaminodiphenylmethane (moles 0.5 times the moles of hydroxyl-terminated polybutadiene) and 0.7g β-cyclodextrin (because β-cyc...

Embodiment 2

[0037] 1) Synthesis of modified polyurethane prepolymer

[0038] Add 9.62g of hydroxyl-terminated polybutadiene (number average molecular weight is 2000g / mol, after 110℃ vacuum dehydration treatment before use) and 10ml N, N into a 150ml three-necked flask equipped with nitrogen protection, mechanical stirring and reflux tube. -Dimethylacetamide (purified by vacuum distillation before use), after the two form a uniform solution under stirring, then 1.88g of toluene diisocyanate monomer (mole number is twice the number of moles of hydroxyl-terminated polybutadiene) ) And the catalyst dibutyltin dilaurate 0.02g (the mass is 0.2% of the mass of the hydroxyl-terminated polybutadiene) were added to the above solution and reacted for 0.5 hours under vigorous stirring and heating in a water bath at 30°C to obtain a diisocyanate-terminated Prepolymer; then 0.52g 4,4'-diaminodiphenylmethane (the number of moles is 0.5 times the number of moles of hydroxyl-terminated polybutadiene) and 0.8...

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Abstract

Belonging to the technical field of pervaporation membrane separation, the invention relates to a preparation method of a modified polyurethane pervaporation phenol / water separation membrane. The preparation method of the membrane consists of: reacting hydroxyl-terminated polybutadiene with diisocyanate to obtain a terminated prepolymer, adding diamine and cyclodextrin as a chain extender for chain extension, and taking N, N-dimethyl acetamide as a solvent to obtain a modified polyurethane solution, carrying out membrane casting on the solution on a polyfluortetraethylene plate, and conducting curing at room temperature for 1 to 1.5 hours, then moving the obtained membrane into an oven at a temperature of 80DEG C for 10-15 hours of heat treatment, thus obtaining the modified polyurethane membrane. The material synthesis and membrane preparation process of the invention is simple, and the prepared membrane has good thermal and chemical stability as well as mechanical properties. Moreover, compared with traditional unmodified polyurethane separation membranes, the membrane prepared in the invention, due to the existence of the modifier cyclodextrin, has a better comprehensive separation effect on phenol in a phenol / water mixed solution, and has a great practical value.

Description

Technical field: [0001] The invention relates to a method for preparing a modified polyurethane membrane for pervaporation phenol / water separation, and belongs to the technical field of pervaporation membrane separation. Background technique: [0002] Phenol and its derivatives are common high-toxicity and difficult-to-degrade organics in industrial wastewater. Phenol-containing wastewater is a typical industrial wastewater with greater harm, mainly from coal chemical, petrochemical plants, pharmaceutical plants, phenol and phenol resin production plants Wait. Phenolic compounds are very toxic to individual organisms. It can be inhaled through contact with the skin and mucous membranes or immersed in the body through the oral cavity. After contact with the protein in the cell protoplasm, it forms insoluble protein and makes the cells inactive. Especially, it has a greater affinity for the nervous system and makes the nervous system pathological. . Phenol-containing wastewater ...

Claims

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Application Information

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IPC IPC(8): B01D71/54
Inventor 叶宏王静冯旭东梁海燕
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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