Composite corrosion inhibitor for butyl rubber chloromethane glycol dehydration and regeneration system

Abstract

The invention relates to a composite corrosion inhibitor for a butyl rubber chloromethane glycol dehydration and regeneration system. The composite corrosion inhibitor comprises at least two compounds, wherein the compounds are selected from heterocyclic compounds; the heterocyclic compounds are selected from nitrogen heterocyclic compounds and sulfur heterocyclic compounds, preferably the compounds are all selected from the nitrogen heterocyclic compounds, or the nitrogen heterocyclic compounds and the sulfur heterocyclic compounds; the nitrogen heterocyclic compounds are selected from a pyrrole compound, an imidazole compound, a pyrazol compound, a pyridine compound, a pyrazine compound, a miazine compound, a quinoline compound, an isoquinoline compound and a benzotriazole compound; and the sulfur heterocyclic compounds are thiazole compounds. According to the composite corrosion inhibitor, the problem of system corrosion due to accumulation of hydrochloric acid in the chloromethane glycol dehydration system can be effectively solved.

Description

[0001] This application is a divisional application of 200910087787.9, and its filing date is: June 26, 2009. The name of the invention is: a composite corrosion inhibitor for butyl rubber chloride methane glycol dehydration regeneration system. technical field [0002] The present invention relates to a composite corrosion inhibitor for butyl rubber methyl chloride glycol dehydration regeneration system, in particular to a key solution to the problem of methyl chloride dehydration in butyl rubber production equipment when glycol is used to remove trace water in methyl chloride Hydrolysis of glycol produces hydrochloric acid, which causes system corrosion. Background technique [0003] The production process of butyl rubber is generally produced by low-temperature slurry polymerization using methyl chloride as a solvent, using high-purity isobutylene and isoprene as raw materials, using high-purity methyl chloride as a diluent, and using aluminum trichloride as a catalyst. T...

AI Technical Summary

Problems solved by technology

Of course, due to the existence of hydrogen ions and chloride ions in the system, the corrosion of the system is unavoidable, and the corrosion will break the hydrolysis balance of methyl chloride. Since the composite corrosion inhibitor is added in the system, the hydrolysis balance of methyl chloride is not obvious, and the concentration of chloride ions and iron ions To increase the amount, chlorine ions and iron ions can be kept at a certain level by replacing a small amount of glycol solution in the system; but if there is no composite corrosion inhibitor, because the reaction between hydrochloric acid and carbon steel is always going on, the hydrolysis balance of methyl chloride It has been breaking down, resulting in the increase of chloride and iron ions in the system