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Preparation method of poly (diallyldimethylammonium chloride) as flocculating agent for treating sewage

A technology of polydimethyldiallyl ammonium chloride and dimethyldiallyl ammonium chloride, which is applied in the direction of flocculation/sedimentation water/sewage treatment, mining wastewater treatment, etc., and can solve the problem of difficult control of relative molecular quality , Polymer viscosity is high, on-site filling difficulties and other problems, to achieve the effect of convenient filling, low product viscosity, and good water purification effect

Active Publication Date: 2017-07-28
中海油(天津)油田化工有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] PDMDAAC is a product obtained by free radical polymerization of monomer DMDAAC. The degree of polymerization reaction, that is, the relative molecular weight of the product is affected by the amount of initiator system and its dosage, monomer concentration, reaction temperature, time control, etc. Conditions, but even if these conditions are precisely controlled, it is still difficult to control the relative molecular weight of the polymerization product in the industrial production process. The molecular weight and viscosity of the product obtained by polymerization are relatively high, and the viscosity can reach several million. , High-viscosity PDMDAAC products have unsatisfactory treatment effect on sewage, low oil removal rate, poor water purification effect, high viscosity polymer and difficult on-site filling, which is difficult to meet the needs of oil fields

Method used

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  • Preparation method of poly (diallyldimethylammonium chloride) as flocculating agent for treating sewage
  • Preparation method of poly (diallyldimethylammonium chloride) as flocculating agent for treating sewage
  • Preparation method of poly (diallyldimethylammonium chloride) as flocculating agent for treating sewage

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Effect test

Embodiment 1

[0037] The preparation method of the first kind of sewage treatment flocculant polydimethyldiallyl ammonium chloride comprises the steps:

[0038] (1) Take 167g of concentration and put it into the reaction vessel, add 0.1g of azobisisobutylamidine hydrochloride, 0.08g of disodium edetate, 10g of dimethyldiallyl ammonium chloride aqueous solution Ethylene glycol, stir evenly, pass into nitrogen to remove the air in the reaction vessel;

[0039] (2) The reaction solution obtained in step (1) was heated up to 40° C. under stirring, and the polymerization reaction was carried out for 3 hours;

[0040] (3) Heat the reaction solution obtained in step (2) to 65°C, add 500g of deionized water, control the temperature at 65°C to 85°C, and react for 1.5h;

[0041] (4) Under the protection of nitrogen, adjust the temperature at 50° C., and heat-preserve for 3 hours to obtain the polydimethyldiallylammonium chloride product.

Embodiment 2

[0043] The preparation method of the first kind of sewage treatment flocculant polydimethyldiallyl ammonium chloride comprises the steps:

[0044] (1) get 143g concentration and be that 70wt% dimethyl diallyl ammonium chloride aqueous solution is put into reaction container, add 2g ammonium persulfate, 0.15g tetrasodium edetate, 65g ethylene glycol, stir, Feed nitrogen to remove the air in the reaction vessel;

[0045] (2) The reaction solution obtained in step (1) was heated up to 60° C. under stirring, and the polymerization reaction was carried out for 1 hour;

[0046] (3) Heat the reaction solution obtained in step (2) to 85°C, add a mixed solution of 0.4g of ammonium persulfate and 10g of deionized water, control the temperature at 85°C to 110°C, and react for 2.5h;

[0047] (4) Under the protection of nitrogen, adjust the temperature at 80° C., and heat-preserve for 7 hours to obtain the polydimethyldiallylammonium chloride product.

Embodiment 3

[0049] The preparation method of the first kind of sewage treatment flocculant polydimethyldiallyl ammonium chloride comprises the steps:

[0050] (1) get 154g concentration and be that 65wt% dimethyl diallyl ammonium chloride aqueous solution is put into reaction vessel, add 1g sodium persulfate, 0.1g sodium ethylenediamine tetramethylene phosphate, 35g ethylene glycol, stir well , feed nitrogen to remove the air in the reaction vessel;

[0051] (2) The reaction solution obtained in step (1) was heated up to 50° C. under stirring, and the polymerization reaction was carried out for 2 hours;

[0052] (3) Heat the reaction solution obtained in step (2) to 75°C, add a mixed aqueous solution of 0.01g of sodium persulfate and 130g of deionized water, control the temperature at 75°C to 95°C, and react for 2 hours;

[0053] (4) Under the protection of nitrogen, adjust the temperature at 60° C., and heat-preserve for 4 hours to obtain the polydimethyldiallylammonium chloride product. ...

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Abstract

The invention discloses a preparation method of poly (diallyldimethylammonium chloride) as flocculating agent for treating sewage. The preparation method comprises the following steps: (1) adding an initiator, a complexing agent and ethylene glycol as a chain transfer agent in an aqueous solution of diallyldimethylammonium chloride, stirring uniformly, and feeding nitrogen to remove air in a reaction container; (2) heating reaction liquid obtained from the step (1) while stirring, and carrying out polymerization reaction; (3) heating to the temperature of 65-85 DEG C, adding the initiator in the reaction liquid again, and adding water in the reaction liquid for reaction; and (4) under protection of the nitrogen, carrying out insulation and curing to obtain the poly (diallyldimethylammonium chloride). The method is simple in process and easy to operate, the reaction temperature is convenient to control, polymerization reaction is stably carried out at low speed, products with medium and low relative molecular mass are easily obtained, and the preparation method is suitable for treatment of oilfield chemical flooding output liquid. The prepared flocculating agent for treating the sewage is high in oil removal rate, high in monomer conversion rate, good in water purification effect, low in viscosity of products and convenient to inject, and has universal applicability.

Description

technical field [0001] The invention belongs to the technical field of oil, gas and water treatment, and in particular relates to a preparation method of a flocculant polydimethyldiallylammonium chloride for sewage treatment. Background technique [0002] At present, in my country's chemical flooding research, polymer flooding technology is relatively mature, and it is the main direction of research on EOR in my country. The chemical flooding technology mainly based on polymer flooding has been well applied in many oil fields. During the 11th Five-Year Plan period, only the Bohai Oilfield has increased the cumulative production of more than 1 million cubic meters of crude oil. At present, this technology has entered the stage of expanded testing and has played a more and more important role in oil fields. increasingly important role. [0003] With the gradual development of chemical flooding in oilfields, the difficulty in the treatment of produced liquid sewage has also gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F126/02C08F2/38C02F1/56C02F103/10
CPCC02F1/56C02F2103/10C08F2/38C08F126/02
Inventor 张国欣程艳崔广振李支文田立峰郝新刚
Owner 中海油(天津)油田化工有限公司
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