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A dopamine-modified chitosan flocculant

The technology of chitosan and flocculant is applied in the field of preparation of novel modified chitosan flocculant, and achieves the effects of good biocompatibility, improved adsorption capacity and solubility, and remarkable flocculation effect.

Active Publication Date: 2020-06-12
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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  • A dopamine-modified chitosan flocculant
  • A dopamine-modified chitosan flocculant
  • A dopamine-modified chitosan flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0029] (2) In the dialysate described in (1), 1 g of dopamine is added, and the reaction is stirred at high speed 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 placed 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 for 12 hours at 25°C. The solution was centrifuged at 2000 rpm, and the lower sediment was...

Embodiment 2

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

[0035] (2) Add 3 grams 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 placed 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 for 12 hours at 25°C. The solution was centrifuged at 2000 rpm, and the lower sediment was removed an...

Embodiment 3

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

[0041] (2) In the dialysate described in (1), 5 grams of dopamine is added, and the reaction is stirred at high speed 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 placed 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 for 12 hours at 25°C. The solution was centri...

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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 specifically relates to a preparation method of a novel modified chitosan flocculant and a process for treating petroleum sewage and printing and dyeing sewage by using the flocculant. Background technique [0002] At present, most of the oil fields in my country have widely used polyacrylamide (PAM) to drive oil, but the PAM in the production fluid of the oil well makes the oil field sewage a complex oil-water system. Compared with ordinary sewage, this polymer-containing sewage has higher viscosity, more stable emulsion system, increased interface membrane strength, increased difficulty in demulsification, and increased sand and oil-carrying capacity of sewage. Therefore, the presence of PAM increases the difficulty of sewage treatment. Most of the domestic oil fields have only done some simple treatments, which are often difficult to meet the national emission standards. If this non-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56C08B37/08C02F103/30
CPCC02F1/56C02F2103/30C08B37/003
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)