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Gas phase corrosion inhibitor for industrial equipment protection and producing process thereof

A gas-phase corrosion inhibitor and industrial equipment technology, applied in the field of gas-phase corrosion inhibitor and its preparation, can solve the problems of insufficient stability of protective film, poor versatility of boiler steam and condensed water systems, and non-adjustable protection radius of gas-phase corrosion inhibitor. Achieve the effects of insensitivity to environmental temperature and humidity changes, good protection effect, and good durability

Inactive Publication Date: 2005-04-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention aims at the problem that the protective radius of the gas phase corrosion inhibitor of the existing industrial equipment cannot be adjusted, the protective film is not stable enough, and the chemical equipment with complex structure and large capacity range changes, especially the complete set of equipment, boiler steam and condensed water system, has poor versatility.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The gas-phase corrosion inhibitor with supramolecular structure of the present invention is an association compound of aluminum-silicon compound-alkylamine-volatile amine molecules with tunnel-shaped hole structures of different inner diameters. Its preparation method includes:

[0022] 1) Preparation of aluminum-silicon compound with tunnel-shaped pore structure; AlNO 3 , AlCl 3 or NaAlO 2 Aluminum compound, made into a solution of a certain concentration, under rapid stirring, add alkali or acid to form a flocculent precipitate, continue to stir to form a sol system, then add a certain amount of silica sol, polyvinyl alcohol and mixed amine to the sol, stir Uniform, polyvinyl alcohol is 0.2% to 0.5% of the total mass of aluminum and silicon; mixed amine is 5% to 10% of the total mass of aluminum and silicon; aged for 2 to 10 hours, roasted at 500 ° C to 700 ° C, roasted The time is controlled within 1-10 hours; it is naturally dried at room temperature, then placed...

example 1

[0028] Example 1: Under rapid stirring, to the AlNO of 1L 0.5mol / L concentration 3Add ammonia to the solution to form a flocculent precipitate, continue stirring to form a sol system, then add 1L of 0.5mol / L silica sol, 0.5% (mass) polyvinyl alcohol and 10% mixed amine to the sol, stir evenly, and age After 7 hours, it was naturally dried at room temperature, then placed in a muffle furnace, and the temperature was programmed to rise to 600°C at a rate of 1°C / min and fired for 3h to obtain aluminum-silicon compounds with tunnel-shaped pore structures with different inner diameters. The aluminum-silicon compound is vacuum degassed to a pressure below 2kPa, and then the saturated steam of mixed amine, morpholine and benzotriazole (mass ratio = 1:1:0.2) is passed through at 160°C for 24h, according to the speed program of 1°C / min Cool down to room temperature, and the gas phase corrosion inhibitor with adjustable volatility and protection radius can be prepared.

example 2

[0029] Example 2: Under rapid stirring, to 1L of 0.5mol / L concentration of AlCl 3 Add ammonia to the solution to form a flocculent precipitate, continue stirring to form a sol system, then add 1L of 0.5mol / L silica sol, 0.5% (mass) polyvinyl alcohol and 10% mixed amine to the sol, stir evenly, and age After 7 hours, it was naturally dried at room temperature, then placed in a muffle furnace, and the temperature was programmed to rise to 600°C at a rate of 1°C / min and fired for 3h to obtain aluminum-silicon compounds with tunnel-shaped pore structures with different inner diameters. The aluminum-silicon compound is vacuum degassed to a pressure below 2kPa, and then the saturated steam of mixed amine, morpholine and benzotriazole (mass ratio = 1:1:0.2) is passed through at 160°C for 24h, according to the speed program of 1°C / min Cool down to room temperature, and the gas phase corrosion inhibitor with adjustable volatility and protection radius can be prepared.

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Abstract

The present invention is gaseous corrosion retardant for industrial apparatus and its preparation process. The supplied supermolecular structure gaseous corrosion retardant is intermolecular Al-Si compound-alkylamine-volatile amine associated complex in tunnel-shaped pore structure of different inner diameters. Two or more compounds are associated through intermolecular structure complementation and molecular distinction to reach the aims of regulating volatilizing property and protection radius. The preparation process of the gaseous corrosion retardant includes the first preparing Al-Si compound in tunnel-shaped pore structure and the subsequent gaseous or liquid phase association of alkylamine and volatile amine and the Al-Si compound to obtain the supermolecular structure gaseous corrosion retardant.

Description

technical field [0001] The invention belongs to a gas phase corrosion inhibitor and a preparation method thereof, and is mainly used for anticorrosion protection of industrial equipment. Background technique [0002] Vapor-phase corrosion inhibitors are mainly used for anti-rust packaging of small metal products and parts, anti-rust protection of industrial equipment during storage and transportation, decommissioning and standby, and anti-corrosion protection during operation and decommissioning of boiler steam and condensate systems. The structural basis of modern vapor phase corrosion inhibitors is the combination of two functional atomic groups with chemical bonds. For example, the corrosion inhibition performance of dicyclohexylamine is very poor, and dicyclohexylamine nitrite, which is formed by covalently bonding dicyclohexylamine groups and nitrous acid groups, is one of the most excellent gas phase corrosion inhibitors. The corrosion inhibition performance of cycloh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/02
Inventor 魏刚熊蓉春
Owner BEIJING UNIV OF CHEM TECH
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