Acid-cleaning inhibiter for cleaning boiler and use method thereof

A pickling corrosion inhibitor and boiler cleaning technology, which is applied to boiler cleaning devices and other directions, can solve the problems of excessive foam, affecting the pickling process, and inconvenient on-site application, and achieves the effects of simple preparation method, convenient use and operation, and easy source.
CN101634030AActive Publication Date: 2010-01-27湖南省湘电试验研究院有限公司 +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
湖南省湘电试验研究院有限公司
Publication Date
2010-01-27
Patent Text Reader

Abstract

The invention discloses an acid-cleaning inhibiter for cleaning a boiler and a use method thereof. The acid-cleaning inhibiter comprises the following components by weight percent: 2.0%-10.0% of acid liquor, 0.08-0.25% of urotropine, 0.04-0.15% of dimethylbenzene thiourea or thiourea, 0.01-0.05% of thiocyanate, 0.03-0.12% of dodecyl-cetyl phenmethyl chloride or bromide, 0.05-0.12% of a surface active agent and the balance of water. Acids suitable for the acid-cleaning inhibiter include hydrochloric acid, citric acid, sulphuric acid, hydrofluoric acid, aminosulfonic acid and phosphoric acid, which are suitable for boiler steel, mild steel, alloy steel and steam steel. The inhibition effect of the invention is over 98% with less toxicity under the boiler chemical cleaning condition, the value of LD50 (orally taken by mice) is 5.74 g / kg. The invention can be stored for 2 years, resistant Fe<3+> ion is 800 mg / kg in the acid cleaning. The preparation method has simple steps, easily obtained raw materials and convention operation.
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Description

technical field

[0001] The invention belongs to chemical preparations and methods for boiler cleaning, in particular to a pickling corrosion inhibitor for boiler cleaning and a use method thereof. Background technique

[0002] In recent years, citric acid pickling corrosion inhibitor is a special corrosion inhibitor urgently needed in the chemical cleaning of large thermal power plants. Shaanxi Chemical Industry Design Institute in China made SH-405 citric acid pickling corrosion inhibitor by using pyrazolone drug by-product FAA colloid, etc. The performance is not stable enough, the shelf life is short, and it has a strong pungent smell. The Lan-826 corrosion inhibitor commonly used in China has precipitated after storage, the corrosion inhibition efficiency has decreased, and its toxicity is relatively high, LD 50 (Mice orally): 1130mg / kg.

[0003] Hydrochloric acid has a strong ability to dissolve iron oxides. After pickling, the surface is in good condition without res...

Claims

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