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Corrosion inhibitor used in carbon steel corrosion in ammonia-method desulphurization ammonium sulfate preparation system

A technology of ammonia desulfurization and corrosion inhibitor, which is applied in the chemical field to achieve the effect of good corrosion inhibition performance, small dosage and simple use

Inactive Publication Date: 2013-07-31
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there are currently no public reports on corrosion inhibitors suitable for carbon steel corrosion in ammonia desulfurization to ammonium sulfate system

Method used

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  • Corrosion inhibitor used in carbon steel corrosion in ammonia-method desulphurization ammonium sulfate preparation system

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Embodiment 1-9

[0028] The corrosion inhibitor is composed of thiourea derivatives, organic amines and imidazoline quaternary ammonium salts. The selection and content of the components in each embodiment are shown in Table 1.

[0029] Table 1 The amount of components in each embodiment

[0030]

[0031]

[0032] The imidazoline quaternary ammonium salt is It is a combination of organic carboxylic acid RCOOH and polyvinyl polyamine NH 2 CH 2 CH 2 NH(CH 2 CH 2 NH) n-1 H is added to the reaction vessel at a molar ratio of 1:1, where R and n are selected as described in the table above, and then at a molar ratio of xylene: organic carboxylic acid = 150:1, xylene is added as a water-carrying agent, 150 Reacted at ℃ for 2h, then heated to 200℃, after 2h of reaction, cooled to 50℃, and then added dropwise benzyl chloride, the benzyl chloride and polyvinyl polyamine NH 2 CH 2 CH 2 NH(CH 2 CH 2 NH) n-1 The molar ratio of H is 1:1, the temperature is controlled to 100°C, and the reaction time is 1 to 3 hou...

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Abstract

The invention relates to a corrosion inhibitor used in carbon steel corrosion in an ammonia-method desulphurization ammonium sulfate preparation system. The corrosion inhibitor is composed of, by weight, 20-80% of a thiourea derivative, 10-50% of organic amine, and 5-40% of imidazoline quaternary ammonium salt. The thiourea derivative is one selected from phenyl thiourea, diphenyl thiourea, thiosemicarbazide and propenyl thiourea. The organic amine is one selected from polyacrylamide, dodecylamine, hexadecylamine and octadecylamine. The chemical structural formula of the imidazoline quaternary ammonium salt is represented as the following, wherein R is phenyl, C2-C11 straight-chain alkyl, CH3(CH2)7CH=CH(CH2)7 or CH3(CH2)9CH=CH(CH2)7, and n is 2, 3, or 4. The corrosion inhibitor has good corrosion inhibiting performance. When the corrosion inhibitor is applied in inhibiting the corrosion in the ammonia-method desulphurization ammonium sulfate preparation system, the dose is low, and application is simple and convenient.

Description

Technical field [0001] The invention belongs to the field of chemistry, and specifically relates to a corrosion inhibitor suitable for carbon steel corrosion in an ammonium sulfate production system by ammonia desulfurization. technical background [0002] Ammonia desulfurization uses a certain concentration of ammonia as a desulfurizer to remove sulfur dioxide in the flue gas to produce ammonium sulfite, which is then oxidized to ammonium sulfate as a by-product with air to achieve the purpose of flue gas desulfurization. Therefore, in the solution of the desulfurization ammonium sulfate system, the sulfate concentration is very high, up to hundreds of thousands of ppm, and the pH value of the solution is between 4-6, which is weakly acidic, and the temperature is about 40°C. Corrosion problems Quite serious. Liu Yuesheng and others systematically analyzed the corrosion mechanism of the equipment in the ammonia desulfurization system and the possible corrosive media and corrosi...

Claims

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Application Information

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IPC IPC(8): C23F11/14
Inventor 肖扬唐和清莫亚平杨慧汤静芳孙庆星蒋国波姚敢英孙志良张红伟
Owner 武汉钢铁有限公司
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