Preparation method for antisludging agent of central air-conditioning circulating water and application thereof

A technology for central air conditioning and circulating water, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc.

Inactive Publication Date: 2013-12-04
LIAONING UNIVERSITY OF TECHNOLOGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of the metal carboxylate produced by it will decrease with the prolongation of time, and it will gradually precipitate and scale, which will have a negative impact on the water quality of the air conditioner.

Method used

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  • Preparation method for antisludging agent of central air-conditioning circulating water and application thereof
  • Preparation method for antisludging agent of central air-conditioning circulating water and application thereof
  • Preparation method for antisludging agent of central air-conditioning circulating water and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: Production of antiscalant X for central air-conditioning circulating water

[0049]In a 1 ton enamel reactor, add 50kg distilled water, 350kg by the unsaturated alcohol that 35 mole oxirane and 3-methyl-3-buten-1-alcohol addition reaction make, 200kg maleic anhydride, The temperature of the reactor was raised to 60 °C. Within 240min, 25kg of distilled aqueous solution dissolved with 1.0kg of sodium persulfate was dropped into the reaction kettle. Maintain the temperature in the reactor at 60° C. for 60 minutes to complete the polymerization reaction, and obtain a polymer that is an aqueous solution of a scale inhibitor for central air-conditioning circulating water. The polymer has a weight-average molecular weight of 35,000.

Embodiment 2

[0050] Example 2: Production of scale inhibitor Y for central air-conditioning circulating water

[0051] Add 130kg ion-exchanged water, 400kg in a one ton reactor, the unsaturated alcohol that 35 mole oxirane and 3-methyl-3-butene-1-alcohol addition reaction make, 220kg maleic anhydride, The temperature of the reactor was raised to 65°C. Within 200 minutes, 50 kg of ion-exchanged aqueous solution in which 1.0 kg of sodium persulfate was dissolved was dropped into the reaction kettle. The temperature in the reactor was maintained at 65° C. for 60 minutes to complete the polymerization reaction, and a polymer was obtained, which was an aqueous solution of a scale inhibitor for central air-conditioning circulating water. The weight-average molecular weight of the polymer was 25,000.

Embodiment 3

[0052] Embodiment 3: experimental medium: 80 ℃ tap water and preparation water: adjust the pH value of aqueous solution with NaOH and HCl; Use analytical pure CaCl 2 Regulates Ca in solution 2+ content. The chemical composition of tap water is: pH7.6, Ca 2+ 67mg / L, Mg 2+ 28mg / L, Cl-15mg / L, SiO 2 18mg / L.

[0053] Comparison of Antiscalant Effects

[0054] Static antiscaling method was used to study the antiscaling effects of X and Y two high temperature antiscalants at a concentration of 5 mg / L in tap water and prepared water at 70°C. The results are shown in Table 1.

[0055] Table 1 Scale inhibition rate / % of scale inhibitors in water at 100°C

[0056]

[0057] It can be seen from Table 1 that the scale inhibition rate of X is better than that of Y in tap water and prepared water. This is because the high-temperature stability of the Y complex is not as high as that of X, and the hydrolysis occurs, which reduces its scale inhibition ability.

[0058] And X not on...

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Abstract

The invention provides a preparation method for an antisludging agent of central air-conditioning circulating water and application thereof. A copolymer (A), a copolymer (B) or a copolymer (C), which is used as a necessary component of the antisludging agent of the central air-conditioning circulating water, is a copolymer having certain weight-average molecular weight, and is gained by polymerizing certain mass of alkyl glycol ether, maleic anhydride and other monomers capable of being copolymerized. The antisludging property of the central air-conditioning circulating water can be provided by copolymer (A), copolymer (B) or copolymer (C) individually, and when the copolymer (A), copolymer (B) or copolymer (C) is in combined utilization, the antisludging property can be improved to a certain extent. The antisludging agent can enable the air-conditioning circulating water to be good in water quality stability property under the condition of air conditioning running temperature, and the acquired stable property cannot be lost along with time within a longer time.

Description

Background technique [0001] The invention relates to a production method and application of a central air-conditioning circulating water water quality stabilizing chemical. That is, the present invention is a specific production method and application of antiscalant in central air-conditioning circulating water treatment chemicals. This antiscalant can be combined with metal ions that can generate scale in water to form a water-soluble substance. Water-soluble substances can exist stably for a long time under the operating temperature of the air conditioner, so that the circulating water of the air conditioner under this condition has a good water quality stability, and the obtained stable properties will not be lost over a long period of time. [0002] Scaling of central air-conditioning water is an urgent problem to be solved in the air-conditioning industry, and many carboxylate-based scale inhibitors have been proposed. However, the stability of the metal carboxylate prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C02F5/12C08F216/14C08F222/02
Inventor 张震斌吴宪龙
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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