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Phosphorus-free water treatment agent, and preparation method and application thereof

A technology of water treatment agent and treatment cycle, applied in water/sludge/sewage treatment, chemical instruments and methods, descaling and water softening, etc. Advanced problems, to achieve good flocculation effect, good scale and corrosion inhibition effect

Active Publication Date: 2016-10-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN102477129A discloses a copolymer of dimethyl diallyl ammonium chloride, methyl methacrylate, acrylamide and acrylic acid, the polymerization process is carried out at room temperature, and the product has a good flocculation and sedimentation effect, but it is not suitable for use as antiscalant or corrosion inhibitor
[0005] The literature "Research on the Copolymerization Reaction Kinetics of Dimethyl Diallyl Ammonium Chloride and Acrylic Acid or Hydroxyethyl Acrylate" (Cao Lina et al., Hebei Industrial Science and Technology, 27 (5): 288-293, 2010) has studied dimethyl diallyl ammonium chloride Allyl ammonium chloride (DMDAAC) is reacted with acrylic acid (AA) and hydroxyethyl acrylate (HEA) for free radical copolymerization in aqueous solution. The paper introduces that the polymerization reaction temperature is selected in the range of 297.15-309.15K, and the initiation system is persulfuric acid Ammonium-sodium bisulfite, the polymer synthesized under this condition has a higher limit viscosity, that is, a higher molecular weight, and is not suitable for use as a scale and corrosion inhibitor for circulating water

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  • Phosphorus-free water treatment agent, and preparation method and application thereof

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preparation example Construction

[0018] The method for preparing a phosphorus-free water treatment agent provided by the present invention comprises: mixing monomers, initiators and molecular weight regulators at 50-95°C, and then continuing at 75-95°C (preferably 85-95°C) Reaction 1-4h, described monomer is dimethyl diallyl ammonium chloride, unsaturated carboxylic acid and acrylate, wherein, described unsaturated carboxylic acid is selected from acrylic acid, maleic acid, methacrylic acid or subacrylic acid Methyl succinic acid, the acrylate is selected from methyl acrylate, ethyl acrylate or hydroxypropyl acrylate (preferably hydroxypropyl acrylate); the mixed mode is:

[0019] (a) the solution of the monomer and the solution of the initiator are respectively added dropwise to the solution of the molecular weight regulator, or

[0020] (b) adding dropwise the solution of the monomer and the solution of the molecular weight regulator into the solution of the initiator respectively, or

[0021] (c) The solu...

Embodiment 1

[0042] Add 3.6 g of sodium metabisulfite and 50 ml of water into a four-necked flask equipped with a stirrer, a reflux condenser, a constant pressure dropping funnel and a thermometer, and start stirring to fully dissolve the sodium metabisulfite. Add 10g of dimethyl diallyl ammonium chloride, 6g of methyl acrylate, 48g of acrylic acid and 25ml of water in a constant pressure dropping funnel, shake well; add 4.8g of ammonium persulfate in another constant pressure dropping funnel and 80ml of water, shake well; start to heat up, when the temperature rises to 50°C, start to add the liquid in the two constant pressure dropping funnels dropwise, while continuing to raise the temperature to 85°C, control the rate of addition so that the two constant pressure The liquid in the dropping funnel was added dropwise within 1 hour, then continued the insulation reaction for 2 hours, stopped the test, and cooled to obtain a product with a solid content of 30.1%.

Embodiment 2

[0044] Add 4.8 g of ammonium persulfate and 80 ml of water to a four-neck flask equipped with a stirrer, reflux condenser, constant pressure dropping funnel, and thermometer, and start stirring to fully dissolve sodium metabisulfite. In a constant pressure dropping funnel, add dimethyl diallyl ammonium chloride 10g, methyl acrylate 6g, acrylic acid 48g and 25ml water, shake up; in another constant pressure dropping funnel, add sodium metabisulfite 3.6g and 50ml of water, shake well; start to heat up, when the temperature rises to 50°C, start to drop the liquid in the two constant pressure dropping funnels, at the same time continue to raise the temperature to 85°C, control the dropping speed so that the two constant pressure drops The liquid in the liquid funnel was added dropwise within 1 hour, and then the insulation reaction was continued for 2 hours, the test was stopped, and the product was obtained after cooling, and the solid content of the product was 29.5%.

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Abstract

The invention discloses a phosphorus-free water treatment agent, a preparation method for the phosphorus-free water treatment agent, and an application of the phosphorus-free water treatment agent in treatment of circulating water. The phosphorus-free water treatment agent is prepared from dimethyldiallylammonium chloride, unsaturated carboxylic acid and acrylate by polymerization, wherein the phosphorus-free water treatment agent has a limiting viscosity of 0.05 to 0.16 dL / g; the unsaturated carboxylic acid is selected from acrylic acid, maleic acid, methacrylic acid or itaconic acid; and the acrylate is selected from methyl acrylate, ethyl acrylate or hydroxypropyl acrylate. The preparation method for the phosphorus-free water treatment agent comprises the following steps: mixing monomers, an initiator and a molecular weight regulator in a manner of dropwise adding at 50 to 95 DEG C, and after dropwise adding is completed, continuing to carry out a reaction at 75 to 95 DEG C for 1 to 4 h, wherein the monomers are the dimethyldiallylammonium chloride, unsaturated carboxylic acid and acrylate. The phosphorus-free water treatment agent provided by the invention has good scale and corrosion inhibition effects, and has good flocculation effects on suspended matters in the circulating water at the same time.

Description

technical field [0001] The present invention relates to a phosphorus-free water treatment agent and its preparation method and application, in particular, to a phosphorus-free water treatment agent, a preparation method of the phosphorus-free water treatment agent and the application of the phosphorus-free water treatment agent in circulating water treatment. application. Background technique [0002] According to the requirements of energy saving and emission reduction, more and more circulating water fields save fresh water by increasing the concentration of circulating water and using a large amount of recycled water as circulating water replenishment, which also brings some problems. As the concentration ratio increases, the turbidity of circulating water also increases continuously. Compared with fresh water, the quality of regenerated water is poor, and the turbidity of circulating water after concentration is higher. The turbidity in the circulating water increases, ...

Claims

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Application Information

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IPC IPC(8): C02F5/12
Inventor 冯婕郦和生胡艳华王岽吴颖魏新
Owner CHINA PETROLEUM & CHEM CORP
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