Abstract: A new cationic monomer, N, N- dimethyl, N- benzyl, N- acrylamide ammonium chloride (DBPMA), was synthesized from acrylic acid, thionyl chloride, dimethylaminoethanol and benzyl chloride through three steps of acylation, esterification and quaternization. Its structure was characterized by IR, NMR and MS. Cationic DBPMA/AM) * * * polymer (hereinafter referred to as DBPMA/AM) is prepared by polymerizing the above cationic monomer with acrylamide (AM). The effects of molar ratio of different substances, polymerization temperature, initiator concentration and reaction time on the flocculation performance of polymer were studied. The results showed that the optimum polymerization conditions were as follows: molar ratio of materials 1∶6, reaction temperature 60℃, initiator dosage 0.8% and reaction time 3h. The cationic degree α of the obtained polymer is 8. 13%, and the molecular weight m is M=4.77× 10~7 ~ 7. The performance evaluation experiment shows that P (DBPMA/AM) has a good flocculation effect on kaolin simulated wastewater and activated sludge, and the floc formed has the characteristics of large floc and rapid sedimentation.

Abstract: In this paper, one-dimensional monomer N, n- dimethyl, n- benzyl, n- acrylamide ammonium chloride was systematically synthesized from acrylic acid, trichloroethane and dimethylamine ethanol through acylation, esterification and quaternization. The structure of cationic monomer was characterized by IR, ~ 1 NMR and mass spectrometry. By studying the reaction temperature, the ratio of raw materials to solvents and other factors, the best synthetic route was determined. The copolymer of P(DBPMA/AM) was prepared by cat. ...

Table of Contents: Abstract 3-4

Abstract 4

1 Introduction 8- 14

1. 1 inorganic polymer flocculant (IPF) 8-9

1. 1. 1 composite inorganic polymer flocculant 8-9

1. 1.2 silicate metal polymer flocculant 9

Organic polymer flocculant 9- 1.2+0 1

1.2. 1 natural organic polymer flocculant 9- 10

1.2.2 Synthetic organic polymer flocculant 10- 1 1

1.3 significance of studying green organic polymer flocculant

1.4 Research status and development trend of cationic flocculant at home and abroad 1 1- 12

1.5 research content of this topic 12- 14

Synthesis of cationic monomer DMAEA and its quaternary ammonium salt dbpma5438+04-37

2. 1 overview 14- 17

2. 1. 1 DMAEA features and uses 14- 16

2. Conventional synthesis method of1.2 dmaea16-17.

2.2 The method used in this experiment-acyl chloride method 17- 18.

2.3 acryloyl chloride synthesis process route 18-22

2.3. Chemical properties and uses of1acryloyl chloride

2.3.2 synthetic route 18- 19

2.3.3 Main raw materials and experimental instruments 19

2.3.4 reaction steps and product separation and purification 19-20

2.3.5 Characterization of acryloyl chloride 20-2 1

Analysis of physical properties of acryloyl chloride 20

Infrared spectrum analysis of acryloyl chloride in 2.3.5.2

2.3.6 Factors affecting the yield of acryloyl chloride 2 1-22

Effect of reaction time on yield

Effect of 2.3.6.2 reaction temperature on the yield of 2 1-22.

Effect of 2.3.6.3 reaction material ratio on yield of 22

2.4 Synthesis of dimethylaminoethyl acrylate 22-29

2.4. 1 synthetic route 22

Reagent 22

2.4.3 Synthesis Method 22-23

2.4.4 Product Separation and Purification 23

2.4.5 Characterization of dimethylaminoethyl acrylate 23-25

2.4.5. 1 infrared spectrum 23-24

2.4.5.21h NMR spectrum 24-25

2.4.5.3 gas mass spectrogram 25

2.4.6 Factors affecting the yield of dimethylaminoethyl acrylate 25-28

2.4.6. 1 Effect of reactant feed ratio on yield 25-26

Effect of 2.4.6.2 reaction time on the yield of 26-27

Effect of 2.4.6.3 reaction temperature on the yield of 27-28

2.4.5 Determine the best conditions for synthesizing dimethylaminoethyl acrylate 28-29

2.5. Synthesis of N- dimethyl, N- benzyl, N- acrylamide ammonium chloride (DBPMA) 29-35

2.5. 1 overview

Reaction Scheme 29

2.5.3 Main instruments and drugs 29-30

2.5.4 Product Synthesis and Purification 30

2. 5. 5N, N- dimethyl, N- benzyl, N- acrylamide ammonium chloride characterization 30-32

2.5.5. 1 infrared spectrum 30-3 1

2.5.5.2 ~1h-NMR * * spectrogram 3 1-32

2.5.6 factors affecting the yield of compound DBPMA 32-34.

2.5.6. 1 effect of raw material ratio on the yield of compound DBPMA 32.

Effect of 2.5.6.2 reaction time on the yield of compound DBPM 32-33

Effect of 2.5.6.3 reaction temperature on the yield of compound DBPMA 33-34

Effect of 2.5.6.4 Solvent on the Yield of Compound 34

2.5.7 determine the best conditions for synthesizing compound DBPMA 34-35.

2.6 Overview 35-37

Synthesis of cationic polymer P(DBPMA/AM) 37-54

3. 1 Introduction 37

3.2 PAM synthesis method 37

3.3 Research Status of CPAM at Home and Abroad 37-38

3.4 P(DBPMA/AM)*** polymerization mechanism 38-42

3.5 Experimental Part 42-44

3.5. 1 Main experimental instruments and drugs 42-43

Synthesis method 43

3.5.3 Flocculation Experiment 43-44

3.6 Results and discussion 44-48

3.6. Factors affecting flocculation performance of1* * * 44-46

3.6. Effect of1.1material ratio on flocculation performance of * * * polymer 44

3.6. 1.2 Influence of initiator dosage on flocculation performance of * * * polymer 44-45

3.6. 1.3 Effect of temperature on flocculation performance of * * * polymer 45-46

Effect of 3.6. 1.4 times on flocculation performance of * * * polymer 46

3.6.2 Orthogonal Optimization Experiment 46-48

3.7 product analysis 48-5 1

3.7. 1 infrared spectrum analysis 48

3.7.2 Determination of Solid Content 48-49

3.7.3 Determination of Cationic Degree 49

3.7.4 Determination of monomer conversion rate 49-50

3.7.5 Determination of molecular weight 50-5 1

3.8 Comparison of flocculation performance with other flocculants 5 1-52

3.9 Sludge Dewatering Experiment 52

3. Electron microscopic characterization of flocculation effect of1052-53.

3. 1 1 abstract 53-54

4 Conclusion 54-55

Acknowledgement 55-56

Reference 56-6 1

Figure 6 1-67

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