Dopamine-modified chitosan flocculant

A chitosan and flocculant technology is applied in the field of preparation of a new type of modified chitosan flocculant to achieve the effects of good biocompatibility, remarkable flocculation effect, and improved adsorption capacity and solubility.

Active Publication Date: 2017-08-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a chitosan flocculant for treating poly-containing sewage, its preparation method and corresponding sewage treatment process, thereby solving the problem of high-efficiency green treatment of sewage

Method used

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  • Dopamine-modified chitosan flocculant
  • Dopamine-modified chitosan flocculant
  • Dopamine-modified chitosan flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Dissolve 1 gram of chitosan (the degree of deacetylation is 80%, and the relative molecular mass is 350,000) in 50ml of acetic acid (0.1mol / L) solution, adjust to 0.1mol / L sodium hydroxide solution When the pH was equal to 5, 120 g of glutaraldehyde was added, and the reaction was stirred at 48° C. for 24 hours. The reacted solution was put into a dialysis bag with a molecular weight cut-off of 14000, and the dialysis bag was dialyzed in 1 L of water for 12 hours, and repeated 7 times.

[0029] (2) Add 1 g of dopamine to the dialysate described in (1), and react with high-speed stirring at 25° C. for 12 hours. After the reaction, the solution was put into a dialysis bag with a molecular weight cut off of 14000, and the dialysis bag was dialyzed in 1 L of water for 12 hours, and repeated 7 times.

[0030] (3) Add 0.5 g of sodium borohydride to the dialysate described in (2), and stir at 25° C. for 12 hours. The solution was centrifuged at 2000 rpm, and the lower la...

Embodiment 2

[0034] (1) Dissolve 1 gram of chitosan (the degree of deacetylation is 80%, and the relative molecular mass is 350,000) in 50ml of acetic acid (0.1mol / L) solution, adjust to 0.1mol / L sodium hydroxide solution When the pH was equal to 5, 120 g of glutaraldehyde was added, and the reaction was stirred at 48° C. for 24 hours. The reacted solution was put into a dialysis bag with a molecular weight cut-off of 14000, and the dialysis bag was dialyzed in 1 L of water for 12 hours, and repeated 7 times.

[0035] (2) Add 3 g of dopamine to the dialysate described in (1), and react with high-speed stirring at 25° C. for 12 hours. After the reaction, the solution was put into a dialysis bag with a molecular weight cut off of 14000, and the dialysis bag was dialyzed in 1 L of water for 12 hours, and repeated 7 times.

[0036] (3) Add 0.5 g of sodium borohydride to the dialysate described in (2), and stir at 25° C. for 12 hours. The solution was centrifuged at 2000 rpm, and the lower la...

Embodiment 3

[0040] (1) 1 gram of chitosan (deacetylation degree is 90%, relative molecular mass is 250,000), is dissolved in 50ml hydrochloric acid (0.1mol / L) solution, is adjusted to with the sodium hydroxide solution of mass fraction 0.1%. When the pH was equal to 5, 120 g of glutaraldehyde was added, and the reaction was stirred at 48° C. for 24 hours. The reacted solution was put into a dialysis bag with a molecular weight cut-off of 14000, and the dialysis bag was dialyzed in 1 L of water for 12 hours, and repeated 7 times.

[0041] (2) Add 5 g of dopamine to the dialysate described in (1), and react with high-speed stirring at 25° C. for 12 hours. After the reaction, the solution was put into a dialysis bag with a molecular weight cut off of 14000, and the dialysis bag was dialyzed in 1 L of water for 12 hours, and repeated 7 times.

[0042] (3) Add 0.5 g of sodium borohydride to the dialysate described in (2), and stir at 25° C. for 12 hours. The solution was centrifuged at 2000 ...

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Abstract

The invention provides a chitosan flocculant for treating sewage containing polyacrylamide. The chitosan flocculant is prepared through grafting of chitosan with dopamine adopting an o-dyhydroxyl structure by the aid of glutaraldehyde under the acidic condition. Materials used in the flocculant are green and pollution-free and cause less damage to the environment. The novel flocculant synthesized by grafting chitosan with dopamine greatly increases the adsorption capability and the dissolubility of chitosan and has a flocculation good effect on sewage containing polyacrylamide; secondary flocculation of dye sewage can be realized by use of precipitates obtained after sewage containing polyacrylamide is treated by the flocculant, and a relatively ideal flocculation effect is obtained. By means of the flocculant, secondary recycling of polyacrylamide is realized, the flocculant has a better flocculation effect on the sewage containing polyacrylamide and printing and dyeing sewage, the flocculation efficiency is greatly improved, and the flocculation cost is saved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a preparation method of a novel modified chitosan flocculant and a process for treating petroleum sewage and printing and dyeing sewage with the flocculant. Background technique [0002] At present, polyacrylamide (PAM) flooding has been widely used in most oilfields in my country, but PAM in oil well production fluid makes oilfield sewage a complex oil-water system. Compared with ordinary sewage, this polymer-containing sewage has higher viscosity, more stable emulsion system, increased interfacial film strength, increased difficulty of demulsification, and increased sand-carrying and oil-carrying capacity of sewage. Therefore, due to the existence of PAM, the difficulty of sewage treatment is increased. Most domestic oil fields only do some simple treatment, which is often difficult to meet the national emission standards. If this substandard sewage is di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C08B37/08C02F103/30
CPCC02F1/56C08B37/003C02F2103/30
Inventor 姜磊刘涵云杨庆利马洪超焦传杰孙海风于文洋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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