Preparation method of modified polyurethane pervaporation phenol/water separation membrane

A technology of pervaporation and polyurethane is applied in the field of preparation of modified polyurethane membranes, which can solve the problems of difficult phenol-containing wastewater treatment, low permeation flux, low flux, etc., and achieves good comprehensive separation performance, low cost, and regular arrangement. orderly effect

Inactive Publication Date: 2014-06-04
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 10.9 g of hydroxyl-terminated polybutadiene (the number-average molecular weight is 2500 g / mol, dehydrated under reduced pressure at 110°C before use) and 10 ml of N, N -Dimethylacetamide (purified by vacuum distillation before use), after the two form a homogeneous solution under stirring, then 1.59 g of toluene diisocyanate monomer (the number of moles is twice the number of moles of hydroxyl-terminated polybutadiene) ) and catalyst dibutyltin dilaurate 0.02g (the mass is 0.2% of the mass of hydroxyl-terminated polybutadiene) were added to the above solution, and it was reacted for 1 hour under the conditions of vigorous stirring and heating in a water bath at 30°C to obtain diisocyanate-terminated Prepolymer; then 0.44g 4,4'-diaminodiphenylmethane (0.5 times the mole number of hydroxyl-terminated polybutadiene) and 0.7g β-cyclodextrin (due to β-cyclodextrin The molecular weight of the hydroxyl-terminated polybutadien...

Embodiment 2

[0037] 1) Synthesis of modified polyurethane prepolymer

[0038] Add 9.62 g of hydroxyl-terminated polybutadiene (the number-average molecular weight is 2000 g / mol, dehydrated under reduced pressure at 110°C before use) and 10 ml of N, N -Dimethylacetamide (purified by vacuum distillation before use), after the two form a homogeneous solution under stirring, then 1.88g of toluene diisocyanate monomer (the number of moles is twice the number of moles of hydroxyl-terminated polybutadiene) ) and catalyst dibutyltin dilaurate 0.02g (the mass is 0.2% of the mass of hydroxyl-terminated polybutadiene) was added to the above solution, and it was reacted for 0.5 hours under the conditions of vigorous stirring and heating in a water bath at 30°C to obtain diisocyanate-terminated Prepolymer; then 0.52g 4,4'-diaminodiphenylmethane (0.5 times the mole number of hydroxyl-terminated polybutadiene) and 0.86g β-cyclodextrin (due to β-cyclodextrin The molecular weight of the hydroxyl-terminate...

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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 preparation method of a modified polyurethane membrane that can be used for pervaporation phenol / water separation, and belongs to the technical field of pervaporation membrane separation. Background technique: [0002] Phenol and its derivatives are highly toxic and refractory organic substances commonly found in industrial wastewater. Phenol-containing wastewater is a typical industrial wastewater that is more harmful. It mainly comes from coal chemical plants, petrochemical plants, pharmaceutical plants, and phenol and phenolic resin production plants. Wait. Phenolic compounds are highly toxic to living organisms. It can be inhaled through the contact of the skin and mucous membranes or immersed in the body through the oral cavity. After contacting with the protein in the cell protoplasm, it will form an insoluble protein and make the cells inactive. . Phenol-containing wastewater also has a serious impact on water sour...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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