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Corrosion inhibitor suitable for iron-based doctor solution

A technology of corrosion inhibitor and desulfurization liquid, applied in the field of gas purification, can solve the problem that the corrosion inhibitor does not have sterilization function, etc., and achieve the effects of reducing corrosion current, increasing polarization resistance and reducing corrosion

Inactive Publication Date: 2016-01-06
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Some of the above methods have higher requirements on equipment materials, some corrosion inhibitors need to be improved urgently, and some corrosion inhibitors do not have bactericidal function

Method used

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  • Corrosion inhibitor suitable for iron-based doctor solution
  • Corrosion inhibitor suitable for iron-based doctor solution
  • Corrosion inhibitor suitable for iron-based doctor solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A compound multifunctional corrosion inhibitor suitable for complex iron desulfurization liquid, the components are as follows:

[0032] Sodium benzoate 0.2g / L,

[0033] Potassium sulfate 1g / L,

[0034] Sodium tungstate 0.1g / L,

[0035] Potassium silicate 0.2g / L,

[0036] Potassium bromide 0.5g / L,

[0037] Formaldehyde 1g / L,

[0038] Sodium dodecylsulfonate 0.2g / L;

[0039] The above composite multifunctional corrosion inhibitor is used in the desulfurization liquid. The process is as follows: 0.64g / hour of the corrosion inhibitor is continuously added to the iron-based desulfurization liquid to dissolve, and the iron-based desulfurization liquid and the gas containing sulfide Contact in the gravity absorption device, the sulfide in the gas phase is absorbed by the iron-based desulfurization liquid and oxidized to sulfur; the sulfur-rich liquid enters the supergravity device to regenerate the desulfurization lean liquid, and the sulfur generated at the same time co...

Embodiment 2

[0042] A compound multifunctional corrosion inhibitor suitable for complex iron desulfurization liquid, the components are as follows:

[0043] Sodium Benzoate 0.05g / L,

[0044] Sodium sulfate 0.4g / L,

[0045] Sodium tungstate 0.02g / L,

[0046] Formaldehyde 0.35g / L,

[0047] Sodium dodecylsulfonate 0.026g / L;

[0048] The above composite multifunctional corrosion inhibitor was continuously added to the desulfurization liquid at 0.2 g / hour according to the process of Example 1.

[0049] The corrosion rate and corrosion depth of the desulfurization solution were measured by the TAFEL three-electrode system, and the results are shown in Table 1.

Embodiment 3

[0051] A compound multifunctional corrosion inhibitor suitable for complex iron desulfurization liquid, the components are as follows:

[0052] Sodium benzoate 1g / L,

[0053] Sodium sulfate 6g / L,

[0054] Sodium tungstate 0.3g / L,

[0055] Potassium silicate 1g / L,

[0056] Potassium bromide 2g / L,

[0057] Formaldehyde 3.5g / L,

[0058] Sodium p-toluenesulfonate 1g / L;

[0059] The above composite multifunctional corrosion inhibitor is continuously added to the desulfurization solution according to the process of Example 1 at 3 g / hour.

[0060] The corrosion rate and corrosion depth of the desulfurization solution were measured by the TAFEL three-electrode system, and the results are shown in Table 1.

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Abstract

The invention discloses a corrosion inhibitor suitable for an iron-based doctor solution. The corrosion inhibitor is composed of a main stable complex iron corrosion inhibitor, an auxiliary stable complex iron corrosion inhibitor, a sterilization type corrosion inhibitor and a stable potential corrosion inhibitor. By the adoption of the corrosion inhibitor, corrosion caused by the iron-based doctor solution to equipment can be effectively relieved. The corrosion inhibitor is added to the iron-based doctor solution process, a more stable iron oxide film can be formed on the surface of the equipment, the corrosive current is reduced, polarization resistance is increased, the corrosive pitting degree is reduced in the manner that the oxide film on the surface of the equipment is thickened, sulfide produced by the doctor solution can hardly deposited in the position so that the corrosive pitting phenomenon can hardly happen, Fe3+ is prevented from directly making contact with the surface of the equipment, and corrosion caused by the complex iron doctor solution to the interior of the equipment can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and in particular relates to a corrosion inhibitor for iron-based desulfurization liquid and a use method thereof. Background technique [0002] 1) The LO-CAT complexed iron desulfurization technology of American Air Cleaning Company, the Sulferox complexed iron desulfurization process jointly developed by Shell Petroleum Company of the United States and Dow Chemical Company, in these two technologies, the chelating agent has a strong affinity for iron, It can quickly dissolve carbon steel, aluminum, copper and other materials, so the shell and internal components of the absorber / oxidizer, solution connecting pipes, valves, etc. are all made of stainless steel, and the chemical agent adding system is made of ABS materials. There are special requirements for pipes, etc., and the process cost is relatively high. [0003] 2) CN85100471 describes a class of tungsten-based water quality corr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/18C23F11/12B01D53/78B01D53/48
Inventor 刘有智罗莹高璟焦纬洲郭慧冬祁极冰
Owner ZHONGBEI UNIV
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