Phosphate-free corrosion inhibition antisludging agent and preparation method thereof

Abstract

The invention relates to phosphate-free corrosion inhibition antisludging agent and a preparation method thereof. Phosphate-free corrosion inhibition antisludging agent is synthesized mainly by A and B; molar ratio of A and B is 2:1, wherein A is low molecular organic carboxylic acid or salt containing carboxylic group, sulfonic group or carbon-carbon double bond and B is one or more of quadrol, diethylenetriamine, and triethylene tetramine. The preparation method thereof is as follows: firstly, A is dissolved in ethanol, benzene, methylbenzene or dimethylbenzene, and switched to a three-neck flask; B is condensed with sodium dodecyl benzene sulfonate or sodium acetate; the condensed product is poured into the three-neck flask; the reaction temperature is controlled; the product is stirred for 1-3h in the temperature of 100 to 170 DEG C, and then the product reacts for 2-4h in the temperature of 160 to 200 DEG C, and finally is decompressed and distilled in the temperature of 80 to 160 DEG C to obtain claybank stringy liquid which is the product. The product is used for rotating hanging sample test of Q235 carbon steel; when dosage is 5mg-L, annual corrosion rate can be reduced to 0.080mm-a and corrosion inhabitation rate reaches 76.6%. When the product is combined with Zn saline solution, the corrosion inhabitation rate can reach 83% and the antisludging rate can reach 95%.

Description

technical field [0001] The invention relates to a phosphorus-free corrosion and scale inhibitor and a preparation method thereof. Background technique [0002] At present, heating is unavoidable in the chemical production process, which requires a large amount of circulating cooling water. However, due to the corrosion of the pipeline by the high-temperature water body, the service life of the pipeline is seriously affected. In addition, due to the Ca in the water 2+ , Mg 2+ Metal ions and other metal ions scale on the surface of the pipeline, which seriously reduces the heat conductivity of the pipeline. However, most of the current corrosion and scale inhibitors are phosphine products, and their application leads to serious eutrophication of water bodies, so the country restricts their use. Therefore, it is of great significance to study a phosphorus-free corrosion and scale inhibitor with superior corrosion and scale inhibition effect and simple synthesis process. Con...

AI Technical Summary

Problems solved by technology

[0002] At present, heating is unavoidable in the chemical production process, which requires a large amount of circulating cooling water. However, due to the corrosion of the pipeline by the high-temperature water body, the service life of the pipeline is seriously affected. In addition, due to the Ca in the water 2+ , Mg 2+ Metal ions and other metal ions scale on the surface of the pipeline, which seriously reduces the heat conductivity of the pipeline

However, most of the current corrosion and scale inhibitors are phosphine products, and their application leads to serious eutrophication of the water body, so the country restricts their use