Tannin and aluminum salt modification decolorizing agent preparation method

A decolorizing agent, aluminum salt technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc. and other problems, to achieve the effect of high positive charge density, increased specific surface area, and large molecular weight

Active Publication Date: 2020-01-14
山东聚杰环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process route of this method is simple and easy to operate, and the modified product has large molecular weight, high charge density, excellent decolorization performance, and fast flocculation speed, but it cannot achieve the removal effect on heavy metal ions in wastewater, and heavy metals still remain in the form of ions in water.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The preparation method of the tannin and aluminum salt modified decolorizing agent described in the present embodiment 1 is prepared by the following steps:

[0045] (1) Add 50g of dicyandiamide, 30g of ammonium chloride, 56g of 30% formaldehyde solution, and 13.6g of tannin into the flask in turn, install a condenser tube, heat to 42°C in a water bath at a heating rate of 0.2°C / min, and dissolve the solid After dissolving, start stirring until the rotation speed is 85rpm, add 56g of 30% formaldehyde solution dropwise under the condition of controlling the polycondensation temperature at 65°C, and keep the reaction for 2.5h.

[0046] (2) Add 41 g of aluminum trichloride to the reaction system in step (1), maintain the reaction temperature at 73° C., ripen for 2 hours, and cool naturally to room temperature to obtain a brownish-yellow transparent viscous liquid product.

[0047] The solid content of the product is 67.73%; the dynamic viscosity (20°C) is 360mpa.s; the pH ...

Embodiment 2

[0049] The preparation method of the tannin and aluminum salt modified decolorizing agent described in the present embodiment 2 is prepared by the following steps:

[0050] (1) Add 60g of dicyandiamide, 27g of ammonium chloride, 76g of 35% formaldehyde solution, and 11.2g of tannin into the flask in turn, install a condenser tube, heat it to 45°C in a water bath at a heating rate of 0.2°C / min, and dissolve the solid Dissolve, start stirring until the rotation speed is 85rpm, add dropwise 76g of 35% formaldehyde aqueous solution under the condition of controlling the polycondensation temperature to 75°C, and keep the reaction for 2h.

[0051] (2) Add 25 g of aluminum trichloride to the reaction system of step (1), maintain the reaction temperature at 65° C., ripen for 1.5 h, and cool naturally to room temperature to obtain a brownish-yellow transparent viscous liquid product.

[0052] The solid content of the product is 63.32%; the dynamic viscosity (20°C) is 325mpa.s; the pH v...

Embodiment 3

[0054] The preparation method of the tannin and aluminum salt modified decolorizing agent described in the present embodiment 3 is prepared by the following steps:

[0055] (1) Add 40g of dicyandiamide, 30g of ammonium chloride, 46g of 25% formaldehyde solution, and 13.9g of tannin into the flask in turn, install a condenser tube, heat it to 41°C in a water bath at a heating rate of 0.2°C / min, and dissolve the solid After dissolving, start stirring until the rotation speed is 85rpm, add 46g of 25% formaldehyde solution dropwise under the condition of controlling the polycondensation temperature at 68°C, and keep the reaction for 3h.

[0056] (2) Add 52.5 g of aluminum trichloride to the reaction system in step (1), maintain the reaction temperature at 80° C., ripen for 1 hour, and cool naturally to room temperature to obtain a brownish-yellow transparent viscous liquid product.

[0057] The solid content of the product is 69.33%; the dynamic viscosity (20°C) is 255mpa.s; the p...

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PUM

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Abstract

The invention belongs to the technical field of water treatment agent production, and particularly relates to a tannin and aluminum salt modification decolorizing agent preparation method, which comprises: adding dicyandiamide, ammonium chloride, a first part of a formaldehyde aqueous solution and tannin into a reactor, heating to dissolve solids, starting stirring, adding a second part of the formaldehyde aqueous solution in a dropwise manner by controlling the temperature of the material system at 65-75 DEG C, and carrying out a heat insulation reaction for 2-3 h after the adding to obtain atannin-dicyandiamide-formaldehyde polycondensate; and adding an aluminum salt into the reaction system, and aging at 65-80 DEG C to obtain the modification decolorizing agent. According to the invention, the prepared modification decolorizing agent has advantages of high positive charge density, large molecular weight, strong decolorizing performance and the like, and is a novel environmentally-friendly water purifying agent integrating decolorization, turbidity removal and heavy metal ion removal.

Description

technical field [0001] The invention belongs to the technical field of water treatment agent production, and in particular relates to a preparation method of a tannin and aluminum salt modified decolorizing agent. Background technique [0002] Printing and dyeing wastewater usually contains textile fibers, organic pigments, dye auxiliaries, etc. Due to its high chroma, high turbidity, and complex components, it is a difficult-to-treat industrial wastewater; because antimony catalysts (antimony acetate, ethylene di Alcohol antimony) lead to antimony pollution of printing and dyeing wastewater; mordants, metal complexing agents (such as dichromate, copper), resin finishing catalysts and acid milling agents (such as zinc), slurry preservatives (such as zinc) used in the printing and dyeing process Such as zinc), pollution of heavy metals such as chromium, copper, zinc, etc., make printing and dyeing wastewater treatment more difficult. [0003] Dicyandiamide-formaldehyde polyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F1/52
CPCC02F1/56C02F1/5236
Inventor 王文泽梁之举
Owner 山东聚杰环保科技有限公司
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