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Compound flocculant for papermaking wastewater and preparation method of compound flocculant

A technology of papermaking wastewater and flocculants, which is applied in chemical instruments and methods, processing wastewater treatment, flocculation/sedimentation water/sewage treatment, etc., can solve problems such as difficult to achieve ideal results, and achieve simple and easy preparation and use methods, Improve the number of recycling, the effect of low overall cost

Inactive Publication Date: 2017-07-07
ZHEJIANG YONGTAI PAPER IND GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the application practice of flocculation agents, it is often difficult to achieve the desired effect by using a single aluminosilicate mineral. It is necessary to improve the flocculation effect through modification treatment and compounding of various minerals, but the compound use of various minerals makes hydrolysis New ions and inorganic salts are gradually accumulated in the recovered slurry water

Method used

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  • Compound flocculant for papermaking wastewater and preparation method of compound flocculant
  • Compound flocculant for papermaking wastewater and preparation method of compound flocculant
  • Compound flocculant for papermaking wastewater and preparation method of compound flocculant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Main reagents and instruments:

[0022] Epichlorohydrin (industrial grade, Baling Petrochemical Co., Ltd.), dimethylamine (industrial grade 40%, Huainan Jinling Zhongshen Chemical Factory), triethylenetetramine (industrial grade, Xiamen Dexin Chemical Co., Ltd.) , anhydrous ethanol (analytical pure), dadan yellow (analytical pure), cetyltrimethylammonium bromide (analytical pure), and papermaking wastewater were obtained from Zhejiang Yongtai Paper Industry Group.

[0023] 500mL three-neck flask, spherical condenser, 250mL constant pressure dropping funnel, DSX-120 digital display electric mixer (Hangzhou Instrument Motor Factory), GKC temperature-controlled water bath (Hangzhou Nuoding Science Equipment Co., Ltd.), PHS-25 type Acidity meter (Hangzhou Nuoding Scientific Equipment Co., Ltd.), NDJ-79 rotary viscometer, MY3000-6H intelligent coagulation test agitator (Qianjiang Meiyu Instrument Co., Ltd.).

[0024] Flocculant Synthesis:

[0025] The reaction is carried o...

Embodiment 2

[0038] With embodiment 1, other reaction conditions are constant, investigate modifier triethylenetetramine consumption on the influence of polymer viscosity and cationic degree, experimental result is as follows figure 2 shown.

[0039] Depend on figure 2 It can be seen that with the increase of the amount of triethylenetetramine, the product viscosity increases gradually. When the amount of triethylenetetramine exceeds 2.5% of the total polymer, gel appears in the product solution, and the water solubility of the polymer becomes poor. The degree of cation increases when the amount of triethylenetetramine is less than 1.5%, and reaches the maximum when the amount of triethylenetetramine is higher than 1.5%, the degree of cation decreases. In the reaction, triethylenetetramine can partially cross-link the polymer chains, and the degree of polymerization increases with the increase of the dosage. Poor, so there will be an increase in viscosity but a decrease in cationicity...

Embodiment 3

[0041]With embodiment 1, other reaction conditions are constant, investigate the influence of reaction temperature on polymer viscosity and cationic degree, experimental result is as follows image 3 shown.

[0042] Depend on image 3 It can be seen that the change trend of polymer viscosity and cationic degree with temperature is basically the same. When the temperature is lower than 70°C, both of them increase with the increase of temperature, and reach the maximum value at 70°C; when the temperature is higher than 70°C, the viscosity and cationicity decrease with the increase of temperature. The reaction between triethylenetetramine and epoxy group is a nucleophilic substitution reaction. If the temperature is too low, the reactant molecules cannot be fully activated, and there is not enough energy to overcome the steric hindrance between molecules, resulting in a slower reaction rate; The reaction is an exothermic reaction, and if the temperature is too high, it will hin...

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Abstract

The invention belongs to the technical field of treating auxiliaries for papermaking wastewater and relates to a compound flocculant for the papermaking wastewater and a preparation method of the compound flocculant. The compound flocculant comprises a polymeric flocculant, modified bentonite and polyacrylamide, wherein the polymeric flocculant is epichlorohydrin and dimethylamine polymer, and the modified bentonite is bentonite acidized by sulfuric acid. The compound flocculant and the preparation method thereof have the advantages that the cheap bentonite is modified and matched with the prepared organic flocculant during use, low comprehensive cost is achieved, and the preparation and application methods are simple are practicable; a small amount of the compound flocculant can evidently lower the TDS, conductivity and COD of the wastewater, and the recycling times of the papermaking wastewater are increased greatly.

Description

technical field [0001] The invention belongs to the technical field of papermaking wastewater reuse treatment aids. Background technique [0002] At present, the coagulation treatment of papermaking wastewater generally uses inorganic coagulants, mainly iron salts and aluminum salts, which have certain effects on the removal of wastewater turbidity, color and COD, but this kind of inorganic coagulant treatment After hydrolysis, the residual amount is large, and new ions and inorganic salts will gradually accumulate in the recovered pulp after hydrolysis. For example, the average concentration of Al ions in an open system is about 2 mg / L, and it is often as high as (30-40) mg / L in a closed recycling system. In this way, after a long time of closed or semi-closed circulation of water, the quality of paper products will be seriously reduced, and it will cause problems in paper production. Among the harmful inorganic dissolved substances, Fe ions have the greatest influence (r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56C02F103/28
CPCC02F1/52C02F1/5236C02F1/56C02F2103/28
Inventor 王建华徐静静吕振华汪华军张丹龙柱王立军
Owner ZHEJIANG YONGTAI PAPER IND GROUP
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