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Preparation method of chitosan modified amphiprotic crosslinked starch sludge dehydrating agent

A technology of chitosan modification and sludge dehydrating agent, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of sludge water content reduction, resource depletion, secondary pollution, etc., and achieves easy operation and reduced The effect of cost and easy availability of raw materials

Inactive Publication Date: 2016-09-28
郭舒洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention: the sludge water content cannot be reduced to less than 60% when the commonly used sludge dewatering agent is used alone, which is easy to cause secondary pollution, and is difficult to degrade under natural conditions. In addition, these dehydrating agents are prepared The raw material of the agent mainly comes from the increasingly scarce petroleum resources, facing the problem of resource depletion, a preparation method of a chitosan-modified amphoteric cross-linked starch sludge dewatering agent is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] First weigh 3g of cornstarch and add it to a three-necked flask with a thermometer and a reflux device, place the flask in a water bath, control the temperature at 80°C, add 300mL of deionized water and 2g of sodium chloride to the flask in turn, and stir for 5min , and then add 1mol / L sodium hydroxide solution to the flask to adjust the pH to 9.6, then add 0.1g epichlorohydrin, stir and react for 2h to obtain cross-linked starch; then add 1g methacryloyl to the above-mentioned cross-linked starch Oxyethyltrimethylammonium chloride, then add 1mol / L hydrochloric acid, adjust the pH to 6.5, control the temperature at 90°C, then add 0.1g ammonium persulfate, 0.3g azobisisobutylamidine hydrochloride in turn, and stir React for 2 hours to obtain cationic crosslinked starch; then add 1g of 2-acrylamido-2-methyl propane to the above cationic crosslinked starch, control the temperature at 100°C, then add 0.1g of ammonium persulfate, 0.3g of azobis Isobutamidine hydrochloride wa...

example 2

[0022] First weigh 4g of cornstarch and add it to a three-necked flask with a thermometer and a reflux device, place the flask in a water bath, control the temperature at 85°C, add 350mL of deionized water and 3g of sodium chloride to the flask in sequence, and stir for 8 minutes , then add 1mol / L sodium hydroxide solution to the flask, adjust the pH to 9.7, then add 0.5g epichlorohydrin, stir and react for 2.5h to obtain crosslinked starch; then add 2g methacrylic acid to the above crosslinked starch Acyloxyethyltrimethylammonium chloride, then add 1mol / L hydrochloric acid, adjust the pH to 6.7, control the temperature at 100°C, then add 0.2g ammonium persulfate, 0.4g azobisisobutylamidine hydrochloride, Stir the reaction for 2.5 hours to obtain cationic cross-linked starch; then add 2g of 2-acrylamido-2-methyl propane to the above-mentioned cationic cross-linked starch, control the temperature at 105°C, then add 0.2g of ammonium persulfate, 0.4g of Azodiisobutylamidine hydro...

example 3

[0025]First weigh 5g of cornstarch and add it to a three-neck flask with a thermometer and a reflux device, place the flask in a water bath, control the temperature at 90°C, add 400mL of deionized water and 4g of sodium chloride to the flask in turn, and stir for 10min , then add 1mol / L sodium hydroxide solution to the flask, adjust the pH to 9.8, then add 0.3g epichlorohydrin, stir and react for 3h to obtain crosslinked starch; then add 3g methacryloyl to the above crosslinked starch Oxyethyltrimethylammonium chloride, then add 1mol / L hydrochloric acid, adjust the pH to 6.8, control the temperature at 110°C, then add 0.3g ammonium persulfate and 0.5g azobisisobutylamidine hydrochloride in turn, and stir React for 3 hours to obtain cationic cross-linked starch; then add 3g of 2-acrylamido-2-methylpropane to the above-mentioned cationic cross-linked starch, control the temperature at 110°C, then add 0.3g of ammonium persulfate, 0.5g of azobis Isobutylamidine hydrochloride, stir...

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Abstract

The invention discloses a preparation method of a chitosan modified amphiprotic crosslinked starch sludge dehydrating agent and belongs to the technical field of dehydrating agent preparation. The preparation method comprises the following steps of adding methacryloyloxyethyl trimethyl ammonium chloride, hydrochloric acid, ammonium sulfate and azobisisobutryamide chloride into prepared crosslinked starch; performing a stirring reaction to obtain cation crosslinked starch; then preparing amphiprotic crosslinked starch; then adding chitosan, lauroyl peroxide and the azobisisobutryamide chloride into the amphiprotic crosslinked starch; obtaining chitosan modified amphiprotic crosslinked starch after a reaction; carrying out reduced pressure distillation and drying to obtain the chitosan modified amphiprotic crosslinked starch sludge dehydrating agent. Examples prove that according to the preparation method, the problem of resource exhaustion is solved when the cost is reduced; in addition, in the preparation process, the environment is not polluted, the prepared sludge dehydrating agent can self-degrade under the nature conditions, the water content of sludge can be lowered from original 60 percent to below 10 percent after the chitosan modified amphiprotic crosslinked starch sludge dehydrating agent is used, and the dehydrating efficiency is very dramatic.

Description

technical field [0001] The invention discloses a preparation method of a chitosan-modified amphoteric cross-linked starch sludge dewatering agent, which belongs to the technical field of dehydrating agent preparation. Background technique [0002] Sludge is the final product of sewage treatment, with high concentration of pollutants, complex components, high organic matter content, strong hydrophilicity, large specific surface area, difficult dehydration, and low mechanical dehydration efficiency. As the most important pre-treatment process, sludge dewatering is a very critical link to reduce the cost of subsequent sludge treatment and disposal. When sludge is landfilled, sludge dehydration can greatly reduce the accumulation site of sludge, save transportation costs, reduce leachate in landfill, and prevent landfill from damaging the surface and groundwater environment; composting sludge When sludge dehydration can greatly reduce the moisture content of sludge, it can meet...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08F285/00C08F251/00C08F220/58C08F220/34C08B31/00C08B37/08C02F11/14
CPCC02F11/14C08B31/003C08B37/003C08F251/00C08F285/00C08G81/00C08F220/34C08F220/585
Inventor 郭舒洋张明孟浩影
Owner 郭舒洋
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