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A kind of dispersed flocculant and its preparation method and application

A flocculant and dispersing technology, which is applied in the field of dispersing flocculants and their preparation, can solve the problems of reducing the apparent viscosity of the dispersion system and forming a gel, so as to improve the solubility and relative molecular mass, and reduce the excessive heat of reaction. , The effect of improving the monomer conversion rate and the relative molecular mass of the product

Active Publication Date: 2020-08-21
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention solves the problems such as climbing rods or gel formation that are easy to occur in the process of preparing CPAM dispersion by the existing dispersion polymerization method by selecting a suitable dispersion medium and controlling the parameters of the polymerization reaction, and reduces the apparent viscosity of the dispersion system so that it is not high. at 500mPa·s, and the molecular weight of the CPAM polymer in the CPAM dispersion is not less than 10 million

Method used

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  • A kind of dispersed flocculant and its preparation method and application
  • A kind of dispersed flocculant and its preparation method and application
  • A kind of dispersed flocculant and its preparation method and application

Examples

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Embodiment 1

[0033] 1. Using the water dispersion polymerization method, add acrylamide (AM) monomer and dimethyl diallyl ammonium chloride (DMDAAC ) monomer, polydimethyldiallylammonium chloride (PDMDAAC) as a dispersant, inorganic salt (NH 4 ) 2 SO 4 and NaCl, make it dissolve completely with deionized water, and ensure that the mass percentage of AM monomer and DMDAAC monomer in the final reaction system is 18%, and n(DMDAAC):n(AM)=15: 85 (mol / mol) (i.e. the ratio of the amount of substance of DMDAAC monomer and AM monomer is 15:85); The mass percentage that dispersant PDMDAAC accounts for the sum of AM monomer and DMDAAC monomer is 3.5%; (NH 4 ) 2 SO 4 The mass percentage in the final reaction system is 20%; the mass percentage of NaCl in the final reaction system is 0.5%, the resulting solution is placed in a 55°C constant temperature water bath and stirred, and the pH value of the reaction system is adjusted to be equal to 6 , after 20 minutes of deoxygenation by nitrogen gas, t...

Embodiment 2

[0038] Except changing the mass percent of AM monomer and DMDAAC monomer and in the final reaction system is 15%, repeat the step of embodiment 1, the relative molecular mass that obtains the CPAM polymkeric substance in the CPAM dispersion is 1.29 * 10 7 , the apparent viscosity of the system is 318.19mPa·s.

Embodiment 3

[0040] In addition to changing n(DMDAAC):n(AM)=20:80 (mol / mol) in the reaction system (i.e. the ratio of the amount of substance of DMDAAC monomer and AM monomer is 20:80), repeat the process of Example 1 step, the result is that the relative molecular mass of the CPAM polymer in the CPAM dispersion is 1.31×10 7 , the apparent viscosity of the system is 325.5mPa·s.

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Abstract

The invention discloses a dispersible flocculant, a preparation method and application thereof. The preparation method comprises the following steps: completely dissolving an acrylamide monomer, a dimethyl diallyl ammonium chloride monomer, poly dimethyl diallyl ammonium chloride and inorganic salt with deionized water, stirring in a 40 to 65 DEG C thermostatic waterbath, adjusting the pH value ofa reaction system to be 3 to 8, leading nitrogen for protection, adding a composite initiator K2S2O8-NaHSO3-V50, and ensuring that reaction is performed at 40 to 65 DEG C in nitrogen atmosphere, so as to obtain a cationic polyacrylamide dispersible flocculant. In dispersible cationic polyacrylamide (CPAM) dispersoid, the relative molecular weight of the cationic polyacrylamide polymer is high, the viscosity of the dispersoid is low, and the stability is high.

Description

technical field [0001] The invention belongs to the field of polymer synthesis, and relates to a dispersed flocculant and its preparation method and application. Background technique [0002] In the "one-step acid-dissolving method" alumina production process, in order to wash out the effective components of aluminum and chloride ions in the sediment (commonly known as "white mud") after solid-liquid sedimentation and separation to meet the recovery and sediment discharge standards, it is necessary Efficient solid-liquid sedimentation separation of white mud. It is required to add a suitable flocculant to achieve the purpose of less washing water and better compressibility of bottom mud. Since the acidity in the washing system is around pH=1, the common flocculants currently on the market cannot be used. [0003] In recent years, more and more attention has been paid to the synthesis of cationic polyacrylamide (CPAM) by dispersion polymerization. This kind of polyacrylami...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F226/02C08F4/40C08F2/16C02F1/56
CPCC02F1/56C08F2/16C08F4/40C08F220/56C08F226/02
Inventor 郭昭华苗家兵陈振龙王永旺杨永亮张云峰池君洲陈东苏向红杨磊李世春范瑞成常宁周永利
Owner CHINA SHENHUA ENERGY CO LTD