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10-methyl acridine iodide and sodium citrate composite scale and corrosion inhibitor

A technology of scale and corrosion inhibitor, sodium citrate, applied in descaling and water softening, chemical instruments and methods, special treatment targets, etc. Degradability and poor scale inhibition performance, etc., to achieve the effect of good scale and corrosion inhibition comprehensive performance, broad market application prospects, and simple process flow

Inactive Publication Date: 2020-06-02
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most of the existing antiscalants face the problems of non-biodegradability and poor scale inhibition performance, which cannot meet the requirements of industrial applications
In addition, in industrial production, a single type of corrosion inhibitor is often not enough to meet the actual steel protection requirements

Method used

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  • 10-methyl acridine iodide and sodium citrate composite scale and corrosion inhibitor
  • 10-methyl acridine iodide and sodium citrate composite scale and corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Corrosion inhibition performance measurement method: prepare composite scale and corrosion inhibitor solutions with concentrations as shown in Table (1) respectively with seawater. At 40°C, fix the carbon steel sheet on the plate mounter, completely immerse it in the test solution, keep the rotating speed at 75rpm for 72h, and record the weight of the test piece before and after the experiment. According to the formula: v = (w 1 -w 2 ) / (s×t) to calculate the corrosion efficiency, where w 1 and w 2 (mg) is the weight loss of the sample before and after soaking, s (cm -2 ) is the area of ​​the steel sample, and t(h) is the soaking time; η w =(v 0 -v) / v 0 Calculate the corrosion inhibition efficiency, where v and v 0 are the corrosion rates without and with inhibitors, respectively.

Embodiment 2

[0020] Calcium carbonate scale performance test method: Calcium carbonate deposition method is used to measure the scale inhibition performance according to the national standard GB / T16632-2008. Put the compound scale and corrosion inhibitor solution prepared in Table (2) in a water bath at 70°C for 10 hours. After the solution is cooled to room temperature, filter it, and titrate the residual Ca in the filtrate with EDTA. 2+ Concentration, and make a blank sample at the same time. According to the formula η s =([Ca 2+ ] f -[Ca 2+ ] o ) / ([Ca 2+ ] i -[Ca 2+ ] o ) to calculate the scale inhibition efficiency, where [Ca 2+ ] f is the Ca in the filtrate after heating in the presence of antiscalant 2+ concentration, [Ca 2+ ] o Indicates Ca in the filtrate after heating without antiscalant 2+ concentration, [Ca 2+ ] i is the Ca in the starting solution 2+ concentration.

[0021] The corrosion and scale inhibition rates of the above two examples of scale and corrosi...

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Abstract

The invention relates to a 10-methyl acridine iodide and sodium citrate composite scale and corrosion inhibitor, the optimal mass ratio is 1: 3, and the corrosion resistance and scale inhibition performance of the 10-methyl acridine iodide and sodium citrate composite scale and corrosion inhibitor are tested through a weight loss method and a static scale inhibition calcium carbonate deposition method. The raw materials of the composite scale and corrosion inhibitor are simple and easy to obtain, the price is low, and compared with a phosphorus (phosphine)-containing scale and corrosion inhibitor, the composite scale and corrosion inhibitor is low in toxicity and harmless and conforms to the development trend of an environment-friendly corrosion inhibitor. The composite scale and corrosioninhibitor is high in continuous action capacity, has good comprehensive scale and corrosion inhibition performance, can meet the requirements of circulating cooling seawater for scale inhibition andcorrosion inhibition, can also avoid the environmental problem caused by an existing phosphorus-containing scale inhibitor, and has wide market application prospects.

Description

technical field [0001] The invention relates to the field of circulating cooling seawater treatment, in particular to a composite scale and corrosion inhibitor of 10-methylacridine iodide and sodium citrate and an application thereof. Background technique [0002] With the rapid development of steel, power generation, chemical and other manufacturing and heavy industries, the consumption of fresh water in industrial processes has increased significantly, exacerbating the shortage of fresh water resources. To relieve pressure on water supplies, seawater is increasingly used in industrial applications, especially in cooling systems and desalination plants. However, seawater contains corrosive media such as chloride ions, sulfate ions, and carbonate ions, which can easily cause equipment corrosion (Sareni, M., et al.Corros. Sci. 2006, 48, 1404; Leenbeer, J.A., et al . Environ. Sci. Technol. 1981, 15, 578). In addition, the continuous evaporation and concentration of water wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12C02F5/10C02F103/08
CPCC02F5/12C02F5/10C02F2303/08C02F2103/08
Inventor 李惠静张维维陈立伟吴彦超
Owner HARBIN INST OF TECH AT WEIHAI
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