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1-hydroxyethylidene-1,1-diphosphonic acid intercalated zinc-aluminum hydrotalcite corrosion inhibitor and preparation method thereof

A technology of hydroxyethylidene diphosphonic acid and zinc-aluminum hydrotalcite, which is applied in the field of corrosion inhibitor preparation for seawater circulation cooling system, can solve the problems of large loss of corrosion inhibitor agent, large amount of agent loss, and high cost, and achieve good results. The effect of corrosion inhibition effect

Inactive Publication Date: 2020-02-07
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention overcomes the deficiencies in the prior art. The existing corrosion inhibitors have problems such as large loss of reagents, high cost, and difficulty in recycling, and provides a corrosion inhibitor of zinc-aluminum hydrotalcite intercalated with hydroxyethylidene diphosphonic acid Agent and its preparation method and application thereof, hydroxyethylidene diphosphonic acid intercalated zinc aluminum hydrotalcite corrosion inhibitor uses hydrotalcite as a nano container, so that it has slow and controlled release characteristics, and solves the problem of large loss of corrosion inhibitor agents ; At the same time, the synergistic corrosion inhibition effect of zinc salt, hydroxyethylidene diphosphonic acid and other corrosion inhibitors on seawater medium is used, and then the corrosion behavior of carbon steel in seawater has a good corrosion inhibition effect

Method used

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  • 1-hydroxyethylidene-1,1-diphosphonic acid intercalated zinc-aluminum hydrotalcite corrosion inhibitor and preparation method thereof
  • 1-hydroxyethylidene-1,1-diphosphonic acid intercalated zinc-aluminum hydrotalcite corrosion inhibitor and preparation method thereof
  • 1-hydroxyethylidene-1,1-diphosphonic acid intercalated zinc-aluminum hydrotalcite corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Press n(Zn 2+ ) / n(Al 3+ )=1.5:1 ratio to weigh Zn(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O, using CO removal 2 deionized water to prepare a mixed salt solution with a mixed salt concentration of 0.5mol / L and a volume of 50ml, called A solution.

[0031] (2) Weigh quantitative NaOH and use CO removal 2 The deionized water is prepared into a NaOH solution with a concentration of 2.0mol / L and a volume of 25ml, which is called B solution.

[0032] (3) Press n(HEDP) / n(Al 3+ )=1.0:3.0 ratio Weigh 25ml of hydroxyethylidene diphosphonic acid, called C solution.

[0033] (4) Transfer the solution C to a 250ml three-necked flask, put it in a water bath and heat it to 35°C to keep it warm. Subsequently, A solution and B solution were simultaneously added dropwise into the three-necked flask containing C solution, and an electric stirrer was used for high-speed stirring during the dropping process and N 2 , control the pH value of the solution at about 9 with ammonia...

Embodiment 2

[0037] (1) Press n(Zn 2+ ) / n(Al 3+ )=2.0:1 ratio to weigh Zn(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O, using CO removal 2 deionized water to prepare a mixed salt solution with a mixed salt concentration of 0.5mol / L and a volume of 50ml, called A solution.

[0038] (2) Weigh quantitative NaOH and use CO removal 2 The deionized water is prepared into a NaOH solution with a concentration of 2.0mol / L and a volume of 25ml, which is called B solution.

[0039] (3) Press n(HEDP) / n(Al 3+ )=1.0:2.0 ratio Weigh 25ml of hydroxyethylidene diphosphonic acid, called C solution.

[0040] (4) Transfer the solution C to a 250ml three-neck flask, put it in a water bath and heat it to 50°C to keep it warm. Subsequently, A solution and B solution were simultaneously added dropwise into the three-necked flask containing C solution, and an electric stirrer was used for high-speed stirring during the dropping process and N 2 , use ammonia water to control the pH value of the solution at a...

Embodiment 3

[0044] (1) Press n(Zn 2+ ) / n(Al 3+ )=2.5:1 ratio to weigh Zn(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O, using CO removal 2 deionized water to prepare a mixed salt solution with a mixed salt concentration of 0.5mol / L and a volume of 50ml, called A solution.

[0045] (2) Weigh quantitative NaOH and use CO removal 2 The deionized water is prepared into a NaOH solution with a concentration of 2.0mol / L and a volume of 25ml, which is called B solution.

[0046] (3) Press n(HEDP) / n(Al 3+ )=1.0:1.0 ratio Weigh 25ml of hydroxyethylidene diphosphonic acid, called C solution.

[0047] (4) Transfer the solution C to a 250ml three-necked flask, put it in a water bath and heat it to 60°C to keep it warm. Subsequently, A solution and B solution were simultaneously added dropwise into the three-necked flask containing C solution, and an electric stirrer was used for high-speed stirring during the dropping process and N 2 , use ammonia water to control the pH value of the solution at...

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Abstract

The invention discloses a 1-hydroxyethylidene-1,1-diphosphonic acid intercalated zinc-aluminum hydrotalcite corrosion inhibitor and a preparation method thereof. The preparation method comprises the steps that a mixed salt solution of zinc nitrate and aluminum nitrate is prepared, a sodium hydroxide solution is prepared, the two type of solutions are added into 1-hydroxyethylidene-1,1-diphosphonicacid liquid dropwise, stirring while dropwise adding and water-bath heating are conducted, after dropwise adding is completed, reaction liquid is poured into a high-pressure reaction kettle, the high-pressure reaction kettle is placed in a vacuum drying oven for heat-preservation aging, the high-pressure reaction kettle is taken out of the vacuum drying oven and cooled to the room temperature, after centrifugal washing is conducted, centrifuged solid is placed in a vacuum drying box to be dried, and thus the 1-hydroxyethylidene-1,1-diphosphonic acid intercalated zinc-aluminum hydrotalcite corrosion inhibitor can be obtained. Hydrotalcite is taken as a nanotainer, thus the 1-hydroxyethylidene-1,1-diphosphonic acid intercalated zinc-aluminum hydrotalcite corrosion inhibitor has the sustained-and-controlled release characteristic, and the problem that the loss amount of medicament of the corrosion inhibitor is solved; and meanwhile, by utilizing the synergistic corrosion-inhibiting effect of the corrosion inhibitors such as zinc salt and 1-hydroxyethylidene-1,1-diphosphonic acid on a seawater medium, the good corrosion-inhibiting effect on the corrosion behavior of carbon steel in seawater is achieved.

Description

technical field [0001] The invention relates to the technical field of preparation of corrosion inhibitors for seawater circulating cooling systems, in particular to a hydroxyethylidene diphosphonic acid intercalated zinc-aluminum hydrotalcite corrosion inhibitor and its preparation method and application. Background technique [0002] The seawater circulation cooling technology uses raw seawater as the cooling medium, and is cooled by the cooling tower after being cooled by the heat exchange equipment and recycled (Hou Chunyang, Seawater Cooling Technology, Ocean Technology, 2002, 21(4): 33- 40); It has the advantages of small water intake, low engineering investment and operating costs, and small sewage discharge. Therefore, using seawater as industrial circulating cooling water is one of the important ways to alleviate the shortage of fresh water resources in coastal cities and regions in my country and protect the marine ecological environment. However, the salt content o...

Claims

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Application Information

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IPC IPC(8): C23F11/167C23F11/18
CPCC23F11/1676C23F11/18
Inventor 王吉会谢树语妙孟姚胡文彬
Owner TIANJIN UNIV
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