Method for preparing organic wastewater treating agent

A technology for organic wastewater treatment and organic solvents, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, and other chemical processes, which can solve the problems of low activity of hexamethylene diisocyanate and long gel reaction time , to achieve the effect of being beneficial to industrial application, using a short time, and having a good catalytic effect

Inactive Publication Date: 2011-07-13
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hexamethylene diisocyanate used in the above-mentioned Japanese patent method is not very active, and

Method used

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  • Method for preparing organic wastewater treating agent

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Experimental program
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Effect test

Embodiment 1

[0031] Preparation method of adsorbent-cyclodextrin polymer material for treating organic wastewater

[0032] Prepared with nitrogen (N 2 ) tube, condensing tube, stirrer and a four-necked flask with a thermometer, before the test, feed N into the flask. 2 , add the DMF solvent of 15ml after driving the air in the bottle, and drop into 0.04g composite catalyst (dibutyltin dilaurate and triethylenediamine molar ratio is 5). Add 2.69g of β-CD while stirring, add 8ml of DMF solution (containing 2.38g of MDI) dissolved in MDI dropwise at a rate of 1ml / min, react for 40 minutes, and the reaction temperature is 55°C. The response was thorough. Finally, 10 ml of chloroform was added and stirred for 8 hours. The reaction product was washed with a large amount of water (hot water was used to remove β-CD), and dried in vacuum for 24 hours to obtain 4.34 g of the cross-linked product. The primary removal rate of phenolic substances in wastewater is 89%.

Embodiment 2

[0034] Preparation method of adsorbent-cyclodextrin polymer material for treating organic wastewater

[0035] Prepared with nitrogen (N 2 ) tube, condensing tube, stirrer and a four-necked flask with a thermometer, before the test, feed N into the flask. 2 , Add 20ml of DMF solvent after the air in the bottle is driven away, and drop 0.08g of composite catalyst (dibutyltin dilaurate and tributylamine mol ratio is 8). Add 3.89g of β-CD while stirring, add 15ml of DMF solution (7.72gMDI) dissolved in MDI at 0.5ml / min, react for 8 hours, the reaction temperature is 60°C, the purpose is to make the crosslinking reaction complete. Finally, 15 ml of chloroform was added and stirred for 12 hours. The reaction product was washed with a large amount of water (using hot water to remove β-CD), and dried in vacuum for 20 hours to obtain a cross-linked product of 9.88 g. The primary removal rate of phenolic substances in wastewater is 90%.

Embodiment 3

[0037] Preparation method of adsorbent-cyclodextrin polymer material for treating organic wastewater

[0038] Prepared with nitrogen (N 2) tube, condensing tube, stirrer and a four-necked flask with a thermometer, before the test, feed N into the flask. 2 , add the DMF solvent of 27ml after driving the air in the bottle clean, and drop into 0.2g composite catalyst (dibutyltin oxide and triethylamine mol ratio is 8). Add 5.69g of γ-CD while stirring, slowly add 25ml of HDI-dissolved DMF solution (10.33gHDI) at 1.5ml / min, react for 18 hours, and the reaction temperature is 70°C, the purpose is to make the crosslinking reaction complete. Finally, 15 ml of chloroform was added and stirred for 20 h. The reaction product was washed with a large amount of water (using hot water to remove γ-CD), and dried in vacuum for 30 h to obtain 13.68 g of the cross-linked product. The primary removal rate of phenolic substances in wastewater is 90%.

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Abstract

The invention relates to the field of wastewater treatment, in particular to a method for preparing a treating agent for aromatic hydrocarbon pollutants in organic wastewater. A method for producing a crosslinking cyclodextrin polymeric material by using cyclodextrin and diisocyanate in the presence of a composite catalyst is adopted, wherein the molar ratio of the cyclodextrin to the diisocyanate is controlled to be 1:(0.3-20); the composite catalyst is prepared by mixing an amine catalyst and a tin catalyst according to a certain ratio; and in the reaction process, the reaction temperature is controlled and the dropping speed of the diisocyanate is controlled to be 0.5 to 2 ml/min. The produced cyclodextrin polymeric material has a good effect of treating the aromatic hydrocarbon pollutants in the organic wastewater, so that the one-step removal rate of phenols in the wastewater can reach over 89 percent.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, in particular to a preparation method of an organic wastewater treatment agent. Background technique [0002] Organic wastewater mainly includes printing and dyeing wastewater, chemical wastewater, traditional Chinese medicine wastewater, petrochemical wastewater, coking wastewater, etc. The main feature of this type of organic wastewater is that the concentration of CODcr is high, and the wastewater also contains various harmful substances such as nitrobenzenes, anilines, and phenols. Therefore, this type of organic wastewater has complex components, high pollutant concentration, high chroma, high toxicity, and is difficult to biochemically degrade. It is a typical high-concentration industrial wastewater containing highly polluted and refractory organic matter. Therefore, the treatment of this type of organic wastewater has always been a difficult problem in the field of wastewate...

Claims

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Application Information

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IPC IPC(8): C08B37/16C08G18/64B01J20/30B01J20/26C02F1/28
Inventor 吕效平周玉青黄娟韩萍芳
Owner NANJING UNIV OF TECH
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