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Chitosan flocculating agent, method for preparing same and application

A technology of chitosan and flocculant, which is applied in the direction of flocculation/sedimentation water/sewage treatment, mining wastewater treatment, etc., can solve the problem of complex water quality that cannot adapt to the oil concentration of oilfield produced water, difficult to apply oilfield produced water treatment, flocculant flocculation effect Limited problems, to achieve the effect of shortening the settling time, improving water solubility and good flocculation effect

Inactive Publication Date: 2018-07-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, these existing flocculants have limited flocculation effects, and cannot adapt to the characteristics of high oil concentration in oilfield produced water, sulfur in water, chemicals and other impurities, and complex water quality, so it is difficult to apply to oilfield produced water treatment
On the other hand, chitosan modification adopts the traditional method, that is, grafting copolymerization with dilute acid as solvent, the grafting is uneven, the grafting rate is low, the solvent consumption is large, and the steps are cumbersome.

Method used

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  • Chitosan flocculating agent, method for preparing same and application
  • Chitosan flocculating agent, method for preparing same and application
  • Chitosan flocculating agent, method for preparing same and application

Examples

Experimental program
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Effect test

Embodiment 1

[0040] At room temperature, 3 g of chitosan with a viscosity-average molecular weight of 850,000 and a degree of deacetylation of 85% was dissolved in 100 ml of a 0.5% glycine hydrochloride ionic liquid aqueous solution, and stirred until the chitosan was completely dissolved. Under the protection of nitrogen, the initiator potassium persulfate (the addition amount is 2% of the chitosan unit moles) was added. Add PBC solution and AM solution successively (the mass ratio of monomer to chitosan is 10:1, and the mass ratio of PBC and AM in monomer is 1:1). After the dropwise addition, react at 60°C for 6h. Then use acetone as a precipitant to precipitate and separate the product and dry it to obtain a chitosan flocculant. It is proved by testing that AM and PBC are grafted on chitosan.

[0041] The solubility of the chitosan flocculant measured at 25°C was greater than 5%, and the grafting rate was 91%. Use it to treat the produced water of an oilfield containing 100mg / L of sus...

Embodiment 2

[0043]At room temperature, 3 g of chitosan with a viscosity-average molecular weight of 750,000 and a degree of deacetylation of 85% was dissolved in 100 ml of a 2% glycine hydrochloride ionic liquid aqueous solution, and stirred until the chitosan was completely dissolved. Under the protection of nitrogen, the initiator potassium persulfate (the addition amount is 2% of the chitosan unit moles) was added. Add PBC solution and AM solution successively (the mass ratio of monomer and chitosan is 10:1, and the mass ratio of PBC and AM in monomer is 1:10). After the dropwise addition, react at 60° C. for 4 h. Then use acetone as a precipitating agent to precipitate and separate the product and dry it to obtain chitosan flocculant.

[0044] The solubility of the chitosan flocculant measured at 25°C was greater than 5%, and the grafting rate was 87%. Use it to treat the produced water of an oilfield containing 20mg / L of suspended solids, add the flocculant 2-10mg / L, the water samp...

Embodiment 3

[0046] At room temperature, 3 g of chitosan with a viscosity-average molecular weight of 850,000 and a degree of deacetylation of 85% was dissolved in 100 ml of a 0.5% glycine hydrochloride ionic liquid aqueous solution, and stirred until the chitosan was completely dissolved. Under the protection of nitrogen, the initiator potassium persulfate (the addition amount is 2% of the chitosan unit moles) was added. Add PBC solution and AM solution successively (the mass ratio of monomer to chitosan is 1:1, and the mass ratio of PBC and AM in the monomer is 1:1). After the dropwise addition, react at 60° C. for 5 h. Then use acetone as a precipitating agent to precipitate and separate the product and dry it to obtain chitosan flocculant.

[0047] The solubility of the chitosan flocculant measured at 25°C was greater than 5%, and the grafting rate was 96%. Use it to treat the produced water of an oilfield containing 1000mg / L of suspended solids, add the flocculant 5-20mg / L, the wate...

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Abstract

The invention provides a chitosan flocculating agent. A structural formula of the chitosan flocculating agent is shown as a formula II. A B in the formula II represents a functional monomer with biquaternary ammonium salt cations and unsaturated double bonds, and an m and an n in the formula II represent number-average degrees of polymerization. The invention further provides a method for preparing the chitosan flocculating agent. The method includes steps of 1), dissolving chitosan in ionic liquid and adding initiators into the ionic liquid under the protection of inert gas to obtain mixtures; 2), sequentially adding propylene acyloxy propane-1, 3-bis-trimethyl ammonium chloride and acrylamide into the mixtures obtained at the step 1), heating the propylene acyloxy propane-1, 3-bis-trimethyl ammonium chloride, the acrylamide and the mixtures and carrying out reaction to obtain products; 3), washing and filtering the products obtained at the step 2) and then drying the products to obtain the chitosan flocculating agent. The invention further provides application of the chitosan flocculating agent to the field of oilfield produced water purification.

Description

technical field [0001] The invention relates to the field of oilfield produced water treatment, in particular to a chitosan flocculant and its preparation method and application. Background technique [0002] As the oilfield enters the high water-cut development period, the produced water increases sharply. The total water production of domestic oil fields exceeds 17×10 8 m 3 / a, the treatment of produced water has become a key factor affecting oilfield production. The treatment methods of produced water can be divided into physical methods (gravity sedimentation, filtration, membrane separation, etc.), chemical methods (flocculation, hydrolysis acidification, chemical oxidation, etc.), physical and chemical methods (air flotation, adsorption, ion exchange, etc.) and Biological methods (activated sludge, biofilm, etc.), among which chemical flocculation is the most widely used and lowest cost treatment method. Iron salt and aluminum salt inorganic flocculants have the ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/56C08F220/34C02F1/56C02F103/10
CPCC02F1/56C02F2103/10C08F251/00C08F220/56C08F220/34
Inventor 胡长朝党伟黄辉唐志伟谭文捷王莉莉毕彩霞
Owner CHINA PETROLEUM & CHEM CORP
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