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Preparation method of dosage form flocculation decoloring agent

A technology of decolorizing agent and flocculation, which is applied in the field of preparation of one-dose flocculation decolorizing agent, can solve the problems of slow flocculation and sedimentation speed of decolorizing agent, cumbersome processing process, complicated process, etc., to improve decolorization and flocculation ability, reduce processing procedures, good effect

Active Publication Date: 2012-06-27
GUANGZHOU BOFANG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the slow flocculation and sedimentation speed of the decolorizing agent, the price of dicyandiamide, acrylamide-dimethyl diallyl ammonium chloride and other raw materials is expensive, resulting in high cost of the decolorizing agent, which restricts the market share of the decolorizing agent in the field of printing and dyeing wastewater treatment Rate
In addition, the existing process for preparing formaldehyde-dicyandiamide resin type decolorizer is relatively complicated, prone to bumping, and the highest temperature often exceeds 80°C, and the decolorization effect of the obtained product is often unsatisfactory
[0006] In the existing technology, dicyandiamide-formaldehyde resin and various modified products need to be combined with inorganic coagulants such as PAC to treat the color of printing and dyeing wastewater to the lowest level. cumbersome

Method used

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preparation example Construction

[0020] A preparation method of a one-dose flocculation decolorant, comprising the following steps:

[0021] 1) Add formaldehyde solution, ammonium chloride, and urea to the reaction vessel in a weight ratio of 4:1-1.5:0.8-1.2, heat to 30-35°C, stop heating, and wait for the reaction system in the container to automatically heat up to 70-80°C After ℃, the reaction time of this step is controlled to be 0.6-1.5h, and the reaction time is calculated from the time when the three materials are added to the container;

[0022] 2) Lower the temperature of the reaction vessel to 45-55°C and add dicyandiamide, wherein the mass ratio of formaldehyde solution to dicyandiamide in step 1) is 2.8-3.5:1, and the temperature of the reaction system is raised to 70- 80℃, keep warm for 1-4h;

[0023] 3) Add water to the above system, the amount of water added accounts for 20-40% of the mass of formaldehyde solution in step 1), and then add soluble chloride salt, wherein, the mass of formaldehyde...

Embodiment 1

[0031] First add 500KG of formaldehyde solution with a concentration of 37% to the reaction kettle, then add 180KG of catalyst ammonium chloride and 139 KG of modifier urea, heat the reaction kettle while stirring continuously, stop heating after the temperature reaches 30°C, the inside of the reaction kettle is due to The temperature of the chemical reaction automatically rises to 75°C. After 1 hour of reaction, the reaction kettle is cooled to 50°C with cooling water, and 152 KG of dicyandiamide is added. The reaction heats up to 75°C. After 2 hours of heat preservation, 100 KG of deionized water is added. Continue to stir, add 30 KG each of ferrous chloride, magnesium chloride, and aluminum trichloride, add 20 KG of sulfuric acid with a mass percentage concentration of 30%, and the product obtained after completely dissolving is a high-efficiency decolorizer, and the appearance is light yellow transparent viscous liquid ,soluble in water. Take 1L of RGB red reactive dye was...

Embodiment 2

[0033] First add 500KG of formaldehyde solution with a concentration of 37% to the reaction kettle, then add 167KG of catalyst ammonium chloride and 125 KG of modifier urea, heat the reaction kettle while stirring continuously, and stop heating after the temperature reaches 35°C. The temperature of the chemical reaction automatically rises to 75°C. After 1 hour of reaction, the reactor cools down to 50°C with cooling water, then adds 167KG of dicyandiamide, and the reaction heats up to 80°C. After 1.5h of heat preservation, add 150 KG of deionized water Continue to stir, add 20 KG each of ferrous chloride, magnesium chloride, and aluminum trichloride, add 15 KG of sulfuric acid with a mass percentage concentration of 30%, and the product obtained after completely dissolving is a high-efficiency decolorizer, and the appearance is a light yellow transparent viscous liquid ,soluble in water. Take 1L of RGB red reactive dye wastewater with a chroma of 8000 times, add 10ml of the a...

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Abstract

The invention discloses a preparation method of a dosage form flocculation decoloring agent. The preparation method comprises the following steps of: 1) adding a formaldehyde solution, ammonium chloride and urea into a reaction container in a weight ratio of 4: (1-1.5): (0.8-1.2), heating to 30-35 DEG C, stopping heating, and controlling the reaction time of the step to 0.6-1.5 hours after the reaction system in the container is automatically heated to 70-80 DEG C; 2) reducing the temperature of the reaction container to 45-55 DEG C, adding dicyandiamide, wherein the mass ratio of the formaldehyde solution in the step 1) to dicyandiamide is (2.8-3.5): 1, and carrying out heat preservation for 1-4 hours when the reaction system is heated to 70-80 DEG C; 3) adding water to the system, wherein the adding amount of water accounts for 20%-40% of the mass of the formaldehyde solution in the step 1), and then adding a soluble chlorine salt, wherein the mass ratio of the formaldehyde solutionused in the step 1) to the soluble chlorine salt is 1: (0.1-0.3); and 4) regulating the pH value to 1-2. The preparation method disclosed by the invention is simple in process; the highest temperature does not exceed 80 DEG C; the obtained decoloring agent is good in decoloring effect and low in cost; and when the product disclosed by the invention decolors printing and dyeing wastewater, an inorganic coagulant does not need to be added, the printing and dyeing wastewater treatment process is reduced, and the decoloring and flocculation capabilities of the product are improved.

Description

technical field [0001] The invention relates to a preparation method of a one-dose flocculation decolorizer. Background technique [0002] Wastewater from printing and dyeing and related industries contains a variety of dyes, pastes, surfactants and other additives. It has the characteristics of complex composition, high concentration of organic matter, poor biodegradability, high alkalinity, high and changeable chroma, and is one of the most difficult industrial wastewater to treat. [0003] Wastewater from printing and dyeing and related industries has high chroma, some as high as 4,000 times. Therefore, the removal of chroma becomes the primary problem. [0004] With the traditional aluminum and iron coagulants, the decolorization effect is poor, and it is difficult to realize the decolorization treatment of printing and dyeing wastewater. Moreover, the amount of mud generated is large, which brings great inconvenience to the subsequent treatment process and increases t...

Claims

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Application Information

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IPC IPC(8): C02F1/54
Inventor 杨宇刘进龙张立果张德
Owner GUANGZHOU BOFANG ENVIRONMENTAL PROTECTION TECH
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