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Hybrid coagulant and preparation method thereof

A coagulant and hybridization technology, applied in the field of water treatment, can solve problems such as the inability to guarantee long-term stable water quality and unsatisfactory water purification effect, and achieve the effects of easy popularization and application, stable properties, and simple preparation methods

Pending Publication Date: 2022-07-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Traditional coagulants are generally aluminum salt and iron salt coagulants, and their hydrolysis reaction is rapid. However, when treating oilfield sewage with emulsification, the water purification effect is not ideal, and the long-term stability of water quality cannot be guaranteed to meet the standard.
Although some compound flocculants disclosed at present have improved the water purification effect of traditional flocculants in sewage treatment, oilfield sewage contains a large amount of oil pollution and suspended matter pollution, and it is difficult for existing compound flocculants to simultaneously remove Therefore, for oilfield sewage, it is necessary to develop another coagulant that can not only realize flocculation and sedimentation of suspended solids, but also realize oil removal and purification.

Method used

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  • Hybrid coagulant and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] A hybrid coagulant is prepared by the following method:

[0028] S1) Preparation of aluminum polysilicate: Dissolve sodium silicate nonahydrate in deionized water, quickly adjust the pH of the solution to 1.5 with 10% hydrochloric acid, and activate it naturally for 4 hours at room temperature to obtain activated silicic acid; The molar ratio of aluminum sulfate octahydrate is 1:0.8, and aluminum sulfate octahydrate is added in a ratio of 1:0.8, after stirring and dissolving, and standing for natural aging for 8 hours to obtain a polyaluminum silicate solution;

[0029] S2) adding dimethyl diallyl ammonium chloride in the ratio of 1:2 according to the mass ratio of aluminum polysilicate and dimethyl diallyl ammonium chloride in the prepared aluminum polysilicate solution, then adding The initiator was ammonium persulfate, and the hybrid coagulant A was obtained by reacting at 45 °C for 6 h.

Embodiment 2

[0031] S1) Preparation of aluminum polysilicate: Dissolve sodium silicate nonahydrate in deionized water, quickly adjust the pH of the solution to 1.5 with 10% sulfuric acid, and activate it naturally for 7 hours at room temperature to obtain activated silicic acid; The molar ratio of aluminum sulfate octahydrate is 1:1.5, and aluminum sulfate octahydrate is added in a ratio of 1:1.5, after stirring and dissolving, and standing for natural aging for 15 hours to obtain a polyaluminum silicate solution;

[0032] S2) adding dimethyl diallyl ammonium chloride in the ratio of 1:5 according to the mass ratio of aluminum polysilicate and dimethyl diallyl ammonium chloride in the prepared aluminum polysilicate solution, then adding The initiator was ammonium persulfate, and the hybrid coagulant B was obtained by reacting at 70 °C for 3 h.

Embodiment 3

[0034] A hybrid coagulant is prepared by the following method:

[0035] S1) Preparation of aluminum polysilicate: Dissolve sodium silicate nonahydrate in deionized water, quickly adjust the pH of the solution to 1.5 with 10% hydrochloric acid, and activate it naturally for 5 hours at room temperature to obtain activated silicic acid; The molar ratio of aluminum sulfate octahydrate is 1:1, and aluminum sulfate octahydrate is added in a ratio of 1:1, after stirring and dissolving, and standing for natural aging for 10 hours to obtain a polyaluminum silicate solution;

[0036] S2) adding dimethyl diallyl ammonium chloride in the prepared aluminum polysilicate solution according to the mass ratio of poly aluminum silicate and dimethyl diallyl ammonium chloride to 1:3.5, then adding The initiator was ammonium persulfate, and the hybrid coagulant C was obtained by reacting at 50 °C for 4 h.

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Abstract

The invention relates to a hybrid coagulant and a preparation method thereof, the coagulant is PMeS-PDMDAAC formed by copolymerization and hybridization of polysilicate and a cationic monomer, the cationic monomer is dimethyl diallyl ammonium chloride and / or methacryloyloxyethyl trimethyl ammonium chloride, and the mass ratio of the polysilicate to the cationic monomer is 1: (2-5). The invention also discloses a preparation method of the hybrid coagulant, which specifically comprises the following steps: S1) hydrolyzing and activating sodium silicate, and reacting with metal sulfate to prepare polysilicate; and S2) adding the prepared polysilicate into a cationic monomer, then adding an initiator ammonium persulfate, and reacting at 45-70 DEG C for 3-6 hours to obtain the hybrid coagulant. The coagulant disclosed by the invention has a better coagulation effect and has obvious oil removal and suspended matter flocculation removal effects on oilfield sewage, and the preparation method of the coagulant is simple and easy to operate.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a hybrid coagulant for treating oilfield sewage and a preparation method thereof. Background technique [0002] Oilfield sewage includes well washing sewage, drilling sewage, underground operation sewage, oil field produced water and mining rainwater, containing a large amount of suspended solids and chloride ions, sulfur ions, sulfate ions, carbonate ions, sodium ions, magnesium ions, calcium ions, Inorganic anions and cations such as potassium ions make oilfield sewage have the characteristics of high salinity, many fouling ions, and complex components. Common treatment methods include air flotation, physical adsorption, chemical coagulation, electrolysis, and biochemical methods. [0003] Coagulants are mainly used for the purification of drinking water, the treatment of industrial wastewater and special water quality (oilfield sewage, printing and dyeing sewage, pape...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56C08F292/00C08F226/02C08F220/34
CPCC02F1/52C02F1/56C08F292/00C08F226/02C08F220/34
Inventor 赵海洋赵毅郭靖黎志敏钟荣强张菁李鹏杨思远滕建强邱海峰崔伟侯建平
Owner CHINA PETROLEUM & CHEM CORP