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 poor versatility of boiler steam and condensed water systems, non-adjustable protection radius of gas-phase corrosion inhibitor, and insufficient stability of the protective film, etc. Achieve the effects of insensitivity to environmental temperature and humidity changes, good protection effect, and simple use process

Inactive Publication Date: 2007-06-06
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 hole structure; aluminum nitrate, aluminum chloride (AlCl 3 ) or aluminates (NaAlO 2 ) aluminum compound, made into a solution of a certain concentration, under rapid stirring, adding alkali or acid, generating flocculent precipitate, continuing to stir, forming a sol system, and then adding a certain amount of silica sol, polyvinyl alcohol and mixed amine to the sol, Stir evenly, 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; aging for 2 to 10 hours, roasting at a temperature of 500°C to 700°C, The calcination time is controll...

example 1

[0027]Example 1: Under rapid stirring, add ammonia to 1L of 0.5mol / L aluminum nitrate solution to form flocculent precipitates, continue stirring to generate a sol system, and then add 1L of 0.5mol / L silica sol, 0.5% (mass) polyvinyl alcohol and 10% mixed amine (commercially available industrial products), stir evenly, after aging for 7 hours, dry naturally at room temperature, then put it into a muffle furnace, and heat up to 600°C and calcined for 3 hours, the aluminum-silicon compound with tunnel-shaped hole structure with different inner diameters can be obtained. The aluminum-silicon compound was vacuum degassed to a pressure below 2kPa, and then mixed amine (commercially available industrial product), morpholine and benzotriazole (mass ratio = 1:1:0.2) saturated steam at 160°C for 24h, according to The temperature was programmed to cool down at a rate of 1°C / min until room temperature, and a gas-phase corrosion inhibitor with adjustable volatility and protection radius w...

example 2

[0028] Example 2: Under rapid stirring, to 1L of 0.5mol / L concentration of AlCl 3 Add ammonia to the solution to generate flocculent precipitates, continue stirring to generate a sol system, then add 1L of 0.5mol / L silica sol, 0.5% (mass) polyvinyl alcohol and 10% mixed amine (commercially available industrial products) to the sol , stir evenly, after aging for 7 hours, dry it naturally at room temperature, then put it into a muffle furnace, heat up to 600°C at a rate of 1°C / min and bake it for 3h, that is, aluminum with tunnel-shaped hole structures with different inner diameters can be obtained. Silicon compounds. The aluminum-silicon compound was vacuum degassed to a pressure below 2kPa, and then mixed amine (commercially available industrial product), morpholine and benzotriazole (mass ratio = 1:1:0.2) saturated steam at 160°C for 24h, according to The temperature was programmed to cool down at a rate of 1°C / min until room temperature, and a gas-phase corrosion inhibitor ...

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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 Patents(China)
IPC IPC(8): C23F11/02
Inventor 魏刚熊蓉春
Owner BEIJING UNIV OF CHEM TECH
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