Environment-friendly composite ferrous sulfide passivator and preparation method thereof

Abstract

The invention discloses an environment-friendly composite ferrous sulfide passivator which is composed of the following components in percentage by mass: 5-10% of sodium pyrosulfate, 10-25% of sodium hypochlorite, 1-10% of trisodium phosphate, 0.5-7% of sodium hydrogen carbonate, 20-35% of sodium hydroxide, 1-2% of potassium ferrate and 30-60% of water; and the environment-friendly composite ferrous sulfide passivator is prepared by uniformly mixing the components according to a specific step order. The environment-friendly composite ferrous sulfide passivator disclosed by the invention is efficient, is free of toxicity, corrosive property and secondary pollution and is capable of quickly passivating ferrous sulfide and effectively preventing spontaneous combustion of ferrous sulfide; the passivator has a good cleaning effect on such malodorant as hydrogen sulfide, ferrous sulfide passivation time is 8-10h and more than 98% of ferrous sulfide is removed, and shutdown time of a device is correspondingly shortened; and a protective film is formed on the surface of passivated metal, so as to effectively prevent metal surface from being further corroded.

Description

technical field [0001] The invention relates to an environment-friendly composite ferrous sulfide passivator, in particular to a passivator that can quickly passivate ferrous sulfide, effectively prevent ferrous sulfide from spontaneous combustion, and has a good cleaning effect on odorous substances such as hydrogen sulfide Environmentally friendly compound ferrous sulfide passivator. Background technique [0002] Due to the presence of sulfur in the crude oil processed by refineries, ferrous sulfide will inevitably be produced in the corresponding equipment and pipelines, and as the sulfur content becomes higher and higher, the operating cycle of the device is getting longer and longer, resulting in the internal components of the equipment and A large amount of ferrous sulfide and other spontaneously combustible substances have accumulated on the pipeline. In the past, due to insufficient understanding of the characteristics of ferrous sulfide spontaneously combustible dur...

AI Technical Summary

Problems solved by technology

[0002] Due to the presence of sulfur in the crude oil processed by refineries, ferrous sulfide will inevitably be produced in the corresponding equipment and pipelines, and as the sulfur content becomes higher and higher, the operating cycle of the device is getting longer and longer, resulting in the internal components of the equipment and A large amount of ferrous sulfide and other spontaneously combustible substances have accumulated on the pipeline. In the past, due to insufficient understanding of the characteristics of ferrous sulfide spontaneously combustible during shutdowns, equipment was often burned due to spontaneous combustion of ferrous sulfide, causing serious economic losses and Potential safety hazards. For example, when a workshop of an oil refinery affiliated to a certain group company was undergoing maintenance, 64m3 of packing was scrapped due to the spontaneous combustion of ferrous sulfide, and the main equipment was also damaged to varying degrees. The direct economic loss amounted to more than 1.2 million yuan. In the same year, the company In another workshop, after the reboiler core was pulled out during maintenance, ferrous sulfide spontaneously ignited and the reboiler was scrapped, causing a direct economic loss of nearly 600,000 yuan. The accident reports over the years show that some refineries are shut down every year for maintenance. Due to the spontaneous combustion of ferrous sulfide, the equipment is damaged to varying degrees, and the direct economic losses are quite huge