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Efficient wastewater decolorizing agent and method for preparing same

A decolorizing agent and wastewater technology, which is applied in textile industry wastewater treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of small floc particles, slow sedimentation speed, low molecular weight, etc., and achieve fast flocculation speed and easy metering and addition , The effect of simple synthesis process

Inactive Publication Date: 2018-01-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dicyandiamide formal is a cationic resin that is easily soluble in water. It has a viscous colloidal liquid appearance. As a flocculant, it has a good decolorization effect on dyes that have been dissolved in water. The formed floc particles are smaller and the sedimentation speed is slower

Method used

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  • Efficient wastewater decolorizing agent and method for preparing same

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] Dicyandiamide, formaldehyde, ammonium chloride and ethylenediamine are prepared decolorizing agent according to the amount ratio of following substances, dicyandiamide: formaldehyde: ammonium chloride: ethylenediamine=1:5:0.5:0.2, formaldehyde and Ammonium chloride is added to the reactor twice, 60% is added for the first time, 40% is added for the second time, and dicyandiamide and ethylenediamine are added at one time. First, add dicyandiamine, ethylenediamine and 60% formaldehyde and ammonium chloride into the reactor, heat it in a water bath to 30°C, and there will be exothermic phenomenon when the reaction starts, stop heating at this time, and continue stirring for 30 minutes , add the remaining 40% formaldehyde and ammonium chloride, control the temperature to rise slowly, and react at 70°C for 3 hours to prepare the ethylenediamine-modified dicyandiamide formal decolorizer.

Embodiment 2

[0022] Dicyandiamide, formaldehyde, ammonium chloride and ethylenediamine are prepared decolorizing agent according to the amount ratio of following substances, dicyandiamide: formaldehyde: ammonium chloride: ethylenediamine=1:2:0.5:0.05, formaldehyde and Ammonium chloride is added to the reactor in three times, 40% for the first time, 30% for the second time, 30% for the third time, and dicyandiamine and ethylenediamine are added at one time. First, add dicyandiamine, ethylenediamine and 40% formaldehyde and ammonium chloride into the reactor, heat it in a water bath to 50°C, and there will be exothermic phenomenon when the reaction starts, stop heating at this time, and continue stirring for 90 minutes , then add 30% formaldehyde and ammonium chloride, and when the temperature rise rate of the reaction mixture is less than 5°C / min, add the remaining 30% formaldehyde and ammonium chloride, control the temperature to rise slowly, and react at 90°C for 6 hours to prepare Get de...

Embodiment 3

[0024] Dicyandiamide, formaldehyde, ammonium chloride and ethylenediamine are prepared decolorizing agent according to the amount ratio of following substances, dicyandiamide: formaldehyde: ammonium chloride: ethylenediamine=1:2:1:0.1, formaldehyde and Ammonium chloride is added to the reactor twice, 60% is added for the first time, 40% is added for the second time, and dicyandiamide and ethylenediamine are added at one time. First, add dicyandiamine, ethylenediamine and 60% formaldehyde and ammonium chloride into the reactor, heat it in a water bath to 40°C, and there will be exothermic phenomenon when the reaction starts, stop heating at this time, and continue stirring for 60 minutes , add the remaining 40% formaldehyde and ammonium chloride, control the temperature to rise slowly, and react at 85°C for 4 hours to prepare the decolorizing agent ethylenediamine-modified dicyandiamide formal (DCD-HCHO).

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Abstract

The invention belongs to the field of treatment on colored wastewater in the textile printing and dyeing industry, and particularly relates to an efficient wastewater decolorizing agent and a method for preparing the same. The method includes preparing raw materials including dicyanodiamine, formaldehyde, ammonium chloride and ethylenediamine; adding the dicyanodiamine, the ethylenediamine, the formaldehyde and the ammonium chloride into a reactor, heating the dicyanodiamine, the ethylenediamine, the formaldehyde and the ammonium chloride until the temperatures of the dicyanodiamine, the ethylenediamine, the formaldehyde and the ammonium chloride reach 30-50 DEG C, stopping heating the dicyanodiamine, the ethylenediamine, the formaldehyde and the ammonium chloride when reaction starts to be carried out and exothermic phenomena occur, stirring the dicyanodiamine, the ethylenediamine, the formaldehyde and the ammonium chloride for 30-90 minutes, slowly increasing the temperatures of reaction mixtures at the speeds of 2-5 DEG C / min under the control from the beginning of the reaction and carrying out the reaction for 3-6 hours under the condition of the temperatures of 70-90 DEG C after the temperatures of the reaction mixtures are increased and reach 70-90 DEG C so as to obtain ethylenediamine-modified dicyandiamide condensation formaldehyde polymers. The quantity relative ratioof the dicyanodiamine to the formaldehyde to the ammonium chloride to the ethylenediamine is 1:2-5:0.5-2.0:0.05-0.2. The efficient wastewater decolorizing agent and the method have the advantages thatthe efficient wastewater decolorizing agent is high in molecular weight, electric charge density and flocculating velocity and excellent in decolorizing performance; the efficient wastewater decolorizing agent can be mixed and used with common inorganic flocculants and organic decolorizing agents and is a decolorizing agent capable of realizing perfect decolorizing effects at a low cost.

Description

technical field [0001] The invention belongs to the field of colored wastewater treatment in the textile printing and dyeing industry, in particular to a modified dicyandiamide formal high-efficiency wastewater decolorizer and a preparation method thereof. Background technique [0002] Dyeing and finishing wastewater has the characteristics of large chroma, high concentration of organic matter, strong alkalinity, and large changes in water quality and quantity. Most textile enterprises use biochemical treatment as the main method, supplemented by physical and chemical treatment. The biological treatment method is effective in removing organic matter and costs less. Low, but the removal of chroma is not ideal; physical and chemical decolorization is fast and efficient, but the removal efficiency of organic matter is low and the treatment cost is high. After a period of operation of wastewater treatment facilities, it is prone to poor biodegradability, serious sludge loss, sho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F103/30
Inventor 张勇
Owner SICHUAN UNIV
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