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Full-strength cationic grafted natural polymer sludge conditioner and preparation method thereof

A technology of natural macromolecules and strong cations, applied in the field of full-strength cationic grafted natural macromolecular sludge conditioner and its preparation, can solve the problems of pH sensitivity, poor solubility and low molecular weight of flocculation effect, and achieve dehydration effect Good, low cost, simple operation effect

Inactive Publication Date: 2019-09-27
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(2) Although the synthetic organic polymer flocculant itself is not toxic, the monomers that do not participate in the reaction, such as acrylamide, are very toxic
However, due to the disadvantages of poor solubility of cellulose and starch itself, relatively low molecular weight, and the flocculation effect is sensitive to pH, its practical application is also limited.

Method used

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  • Full-strength cationic grafted natural polymer sludge conditioner and preparation method thereof
  • Full-strength cationic grafted natural polymer sludge conditioner and preparation method thereof
  • Full-strength cationic grafted natural polymer sludge conditioner and preparation method thereof

Examples

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Embodiment 1

[0033] A kind of preparation method of described full-strength cationic graft natural polymer sludge conditioner of the present invention, it can be prepared by the reaction formula of formula (Ⅲ), comprises the steps:

[0034]

[0035] (1) Dispersing starch (weight-average molecular weight is 150,000) in 10% sodium hydroxide solution (solvent is a mixed solvent of water and isopropanol, wherein the mass ratio of water to isopropanol is 1:1) ), alkalized for 1 hour; after that, adding CTA mass percentage concentration is 50% isopropanol solution (wherein CTA and starch mass ratio are 1:1), reacted 4 hours at 50 ℃, after the completion of the reaction, ethanol was used as precipitation agent, precipitated and separated to obtain the main chain cationized starch.

[0036] (2) dissolving the main chain cationized starch in water, and configuring it into a solution with a main chain cationized starch mass percentage concentration of 1%. After the solution is uniform, add potass...

Embodiment 2

[0039] The difference between embodiment 2 and embodiment 1 is: the preparation method of a kind of described full-strength cationic graft natural polymer sludge conditioner of the present invention, comprises the steps:

[0040] In step (1), the cellulose (weight-average molecular weight is 500,000) is dispersed in the mass percentage concentration and is 1% potassium hydroxide solution (solvent is water and isopropanol mixed solvent, wherein the quality of water and isopropanol Ratio is 1:3), alkalized for 1.5 hours; after that, adding CTA mass percent concentration is 30% isopropanol solution (wherein CTA and cellulose mass ratio are 2:1), reacted at 60 ℃ for 5 hours, the reaction After completion, ethanol is used as a precipitating agent for precipitation and separation to obtain main chain cationized cellulose.

[0041] In step (2), the main chain cationized cellulose is dissolved in water, configured into a solution with a main chain cationized cellulose mass percentage ...

Embodiment 3

[0044] The difference between embodiment 3 and embodiment 1 is: the preparation method of a kind of described full-strength cationic graft natural polymer sludge conditioner of the present invention, comprises the steps:

[0045] In step (1), starch (weight-average molecular weight is 50,000) is dispersed in the mass percent concentration and is 15% sodium hydroxide solution (solvent is water and isopropanol mixed solvent, wherein the mass ratio of water and isopropanol 1:0.2), alkalized for 2 hours; after that, add CTA mass percent concentration and be 20% isopropanol solution (wherein CTA and starch mass ratio are 3:1), react at 30 ℃ for 1 hour, after the reaction is completed Using ethanol as a precipitant, precipitation and separation, the main chain cationized starch is obtained.

[0046] In step (2), the main chain cationized starch is dissolved in water, configured into a solution with a main chain cationized starch mass percentage concentration of 1.5%, and after the s...

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Abstract

The invention discloses a full-strength cationic grafted natural polymer sludge conditioner and a preparation method thereof. The full-strength cationic grafting natural polymer sludge conditioner is such a full-strength cationic grafting natural polymer sludge conditioner that is obtained by obtaining a main chain cationic natural polymer by etherification modification and then subjecting the main chain cationic natural polymer to graft strong cationic monomer copolymerization, and has the structural formula as shown in formula (II): the formula is shown in the description. In the full-strength cationic grafted natural polymer sludge conditioner, the degree of substitution of the main chain quaternary ammonium group is 5% to 90%. The sludge conditioner of the invention has good dewatering effect, not only improves the sludge dewatering performance, but also improves dissolution performance; raw materials cellulose and starch are wide in source, natural non-toxic and degradable, and has various functions such as good sludge dewatering, flocculation, metal ion adsorption, bacteriostatic action, deodorization, decolorization and capability of effective reduction of COD values.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a full-strength cationic grafted natural polymer sludge conditioner and a preparation method thereof. Background technique [0002] Sludge is a by-product of the water supply and drainage treatment process. Sludge mainly includes solid particles such as sediment, fibers, animal and plant residues mixed into the water body, and coagulated flocs, various colloids, organic matter and adsorbed metal elements. , germs, insect eggs and other complex substances, the solid content of untreated sludge is generally lower than 8%. At present, sludge disposal is an important part of the water treatment system, and its cost accounts for about half of the total operating cost of the sewage treatment plant. With the stricter environmental laws and regulations of various countries and the continuous improvement of public awareness of environmental protection, sludge disposal has beco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/147C08F251/00C08F251/02C08F220/34
CPCC02F11/14C08F251/00C08F251/02C08F220/34
Inventor 杨琥陈炜闵广宇沈少航陈润泽魏华胡潘
Owner NANJING UNIV
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