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Zwitterionic flocculant and preparation method thereof

A zwitterion and flocculant technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc. The effect of convenient injection, less dosage and remarkable effect

Active Publication Date: 2022-03-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single-type flocculant has the problem of large dosage and poor treatment effect in the treatment of sewage systems where anions and cations coexist.

Method used

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  • Zwitterionic flocculant and preparation method thereof
  • Zwitterionic flocculant and preparation method thereof
  • Zwitterionic flocculant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of Example 1 Zwitterionic Flocculant 1

[0033] Get 52g methacryloyloxyethyltrimethylammonium chloride aqueous solution, add 8.32g diallylamine, 31g deionized water, 8.45g hydrochloric acid, after hydrochloric acid is completely dissolved in system, open heating switch, keep temperature at 60°C, add 0.4g of ammonium persulfate after 20 minutes of nitrogen deoxygenation, initiate polymerization for 4 hours, cool down to 0°C, add 3.51g of sodium hydroxide, stir and dissolve, add 6.52g of carbon disulfide aqueous solution to the reaction system dropwise, after the dropwise addition is completed Raise the temperature to room temperature and react for 3 hours to obtain zwitterionic flocculant 1.

[0034] The reaction process in embodiment 1 is as follows:

[0035]

[0036] Simultaneously in order to further illustrate this product, carry out infrared spectrum scanning to it, scanning result is as follows figure 1 shown.

[0037] In the picture, at 3453cm -...

Embodiment 2

[0038] Example 2 Preparation of zwitterionic flocculant 2

[0039] Take 52g of acryloyloxyethyltrimethylammonium chloride aqueous solution, add 8.32g of diallylamine, 31g of deionized water, and 8.45g of hydrochloric acid. After the hydrochloric acid is completely dissolved in the system, turn on the heating switch and keep the temperature at 60°C , add 0.4g of ammonium persulfate after 20 minutes of nitrogen deoxygenation, initiate polymerization for 4 hours, then cool down to 0°C, add 3.51g of sodium hydroxide, stir and dissolve, add 6.52g of carbon disulfide aqueous solution to the reaction system dropwise, and raise the temperature to After reacting at room temperature for 3 hours, zwitterionic flocculant 2 was obtained.

Embodiment 3

[0040] Example 3 Preparation of Zwitterionic Flocculant 3

[0041] Take 64g of diallyldimethylammonium chloride aqueous solution, add 8.32g of diallylamine, 19g of deionized water, and 8.45g of hydrochloric acid. After the hydrochloric acid is completely dissolved in the system, turn on the heating switch and keep the temperature at 60°C. Add 0.4g of ammonium persulfate after 20 minutes of deoxygenation with nitrogen, start the polymerization for 4 hours, then cool down to 0°C, add 3.51g of sodium hydroxide, stir and dissolve, add 6.52g of carbon disulfide aqueous solution to the reaction system dropwise, and warm up to room temperature after the dropwise addition After reacting for 3h, zwitterionic flocculant 3 was obtained.

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Abstract

The invention discloses a zwitterionic flocculant and a preparation method thereof, and belongs to the technical field of oilfield produced liquid treatment. The zwitterionic flocculant is prepared by the following steps: adding an unsaturated quaternary ammonium salt monomer, an unsaturated secondary amine monomer and hydrochloric acid into water, and polymerizing under the action of an initiator to obtain a polymer solution, the total mass of the monomers being not less than 45% of the total mass of the whole solution; and adding sodium hydroxide into the polymer solution, cooling to 0-10 DEG C, dropwise adding carbon disulfide, heating to room temperature after the carbon disulfide is dropwise added, and reacting for 2-5 hours to obtain the catalyst. Compared with a single cationic flocculant and a single anionic flocculant, the zwitterionic flocculant disclosed by the invention has the advantages of being small in dosage, remarkable in effect and convenient to inject.

Description

technical field [0001] The invention relates to the technical field of oilfield production fluid treatment, in particular to a zwitterionic flocculant and its preparation method and application. Background technique [0002] With the development of oil fields, the amount of water produced by oil fields is increasing. Oilfield produced water contains a large number of oil droplets and suspended solids, and its oil content needs to be effectively reduced before it is reinjected or discharged. Flocculation is one of the important methods to effectively reduce the oil content of produced water by adding flocculant to the produced water to promote the aggregation of oil droplets and the separation of oil and water. At present, flocculants commonly used in oilfield treatment of produced water are mainly cationic polymers, nonionic polymers and anionic dithiocarbamate compounds. However, single-type flocculants have the problems of large dosage and poor treatment effect in the tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/34C08F226/04C08F8/34C02F1/56C02F101/32
CPCC08F220/34C08F8/34C02F1/56C02F2101/30C02F2101/32C08F226/04
Inventor 任小丽段明方申文吴刚王祎帆
Owner SOUTHWEST PETROLEUM UNIV