Preparation method for modified dicyandiamide-formaldehyde flocculating agent and application of flocculating agent product

A technology of dicyandiamide formaldehyde and flocculants, which is applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, textile industry wastewater treatment, etc., can solve problems such as difficult operation and difficult industrial production, and achieve simple process and easy The effect of mild operation and reaction conditions

Inactive Publication Date: 2013-10-16
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main component of the flocculant is polyaluminum chloride, which itself has a good effect of purifying and treating printing and dyeing sewage. It has the effect of decolorization, but this method needs to be pre

Method used

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  • Preparation method for modified dicyandiamide-formaldehyde flocculating agent and application of flocculating agent product
  • Preparation method for modified dicyandiamide-formaldehyde flocculating agent and application of flocculating agent product
  • Preparation method for modified dicyandiamide-formaldehyde flocculating agent and application of flocculating agent product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 0.7 mol of formaldehyde, 0.5 mol of dicyandiamide and 0.1 mol of urea into the reactor, then raise the temperature to 40°C, then add 0.036 mol of aluminum chloride, after the addition, control the temperature at 40 ℃ for 20min~30min; after the reaction, add 0.2mol of the remaining formaldehyde, so that the molar ratio of the raw material dicyandiamide to the total amount of formaldehyde is 1:1.8, then raise the temperature to 45℃, and add 0.72mol of ammonium salt Modifier, the ammonium salt modifier is ammonium chloride, and after controlling the temperature for 30min to 40min, the temperature is raised to 65°C and the reaction is continued for 3 hours. After the reaction, the modified dicyandiamide formaldehyde flocculant is obtained .

Embodiment 2

[0027] Add 0.7 mol of formaldehyde, 0.5 mol of dicyandiamide and 0.125 mol of urea into the reactor, then raise the temperature to 30°C, then add 0.0375 mol of aluminum chloride, after the addition, control the temperature at 30 ℃ for 20min to 30min; after the reaction, add the remaining 0.2375mol of formaldehyde, so that the molar ratio of the raw material dicyandiamide to the total amount of formaldehyde is 1:1.875, then raise the temperature to 45℃, and add 0.75mol of ammonium Salt modifier, the ammonium salt modifier is ammonium chloride, and after controlling the temperature for 30min to 40min, the temperature is raised to 75°C to continue the reaction for 2 hours. After the reaction, the modified dicyandiamide formaldehyde flocculation agent.

Embodiment 3

[0029]Add 0.8 mol of formaldehyde, 0.5 mol of dicyandiamide and 0.150 mol of urea into the reactor, then raise the temperature to 35°C, then add 0.0390 mol of aluminum chloride, after the addition, control the temperature at 35 ℃ for 20min-30min; after the reaction, add the remaining formaldehyde 0.1750mol, make the molar ratio of the raw material dicyandiamide to the total amount of formaldehyde 1:1.95, then raise the temperature to 45℃, add 0.78mol of ammonium Salt modifier, the ammonium salt modifier is ammonium chloride, and after controlling the temperature for 30min to 40min, the temperature is raised to 70°C to continue the reaction for 2.5 hours. After the reaction, the modified dicyandiamide formaldehyde flocculation agent.

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Abstract

The invention relates to a preparation method for a modified dicyandiamide-formaldehyde flocculating agent and application of a flocculating agent product, which belongs to the technical field of wastewater treatment. The invention provides the preparation method for the modified dicyandiamide-formaldehyde flocculating agent to overcome the problems of uneasy operation, poor decolouring and a low COD removal rate in the prior art. The preparation method comprises the following steps: adding a most part of the raw material formaldehyde, dicyandiamide and urea into a reactor, then adding aluminum chloride and carrying out a react at a temperature of 30 to 40 DEG C; and then adding residual formaldehyde, heating to a temperature of 45 DEG C, adding an ammonium salt modifier, controlling temperature, carrying out a reaction, heating to a temperature of 65 to 75 DEG C and carrying out a reaction for 2 to 3 h so as to obtain the modified dicyandiamide-formaldehyde flocculating agent. The preparation method provided by the invention has the advantages of simple process, no need for preparation of a fresh polyaluminum chloride solution, mild reaction conditions and easy operation, and the prepared flocculating agent has a good decolouring effect and a high COD removal rate.

Description

technical field [0001] The invention relates to a preparation method of a modified dicyandiamide formaldehyde flocculant and the application of the product, belonging to the technical field of sewage treatment. Background technique [0002] There are more than 9,000 kinds of dyes in use today, among which nitrophenol dyes have the greatest impact on the environment, and are characterized by strong chroma, high COD content, poor biodegradability, extreme pH and alternate oxidase values, and also contain A variety of salts, surfactants, heavy metals, mineral oils, etc. Dyes are highly structured polymers and are notoriously difficult to biodegrade; even some dyes are not absorbed by activated sludge. Therefore, they are discharged from sewage treatment plants and enter natural water bodies to pollute the environment. Therefore, dye wastewater must be effectively treated before discharge. Another major feature of printing and dyeing wastewater is its high chroma, and some pr...

Claims

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Application Information

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IPC IPC(8): C08G12/40C08G12/16C08G12/12C02F1/56C02F101/34C02F101/38C02F103/30
Inventor 赵永军张跃进王娟葛志刚张慧赵国华高树梅刘辉柳红霞李斌
Owner JIAXING UNIV
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