Highly effective ferrous sulfide deactivation cleaning agent

Abstract

A highly efficient inactivating detergent for ferrous sulfide is disclosed, which is characterized by that it comprises 0.1-10% of chlorine dioxide, 0.1-10% of surfactant, 0.1-5% of citric acid, 0.1-5% of EDTA, 0.1-5% of corrosion inhibitor and water. The surfactant is one or more from dodecyl sulphonate, dodecyl benzene sulfonate, condensate of alkyl phenol and epoxyethane and condensate of aliphatic alcohol and epoxyethane. The corrosion inhibitor is urotropine, dibutyl thiourea or alkyl pyridine. Using the inventive inactivating detergent in cleaning petroleum refining apparatus, ferrous can be thoroughly oxygenized, inactivated and sulfated on one aspect, to prevent occurrence of self-ignition accident, oil crust can be totally washed from the apparatus on the other aspect, which makes the invention has characteristics of high efficiency, secure and environmental protective.

Description

High-efficiency ferrous sulfide passivation cleaning agent technical field The invention relates to a passivation cleaning agent for cleaning ferrous sulfide scale deposited on petrochemical equipment. Background technique In the refining process of petroleum, especially high-sulfur crude oil, such as vacuum distillation, catalytic cracking, hydrocracking, coking, hydrorefining, gas separation or desulfurization, a large amount of ferrous sulfide will be produced, which adheres to the refining unit. within the pipeline. The accumulation of a large amount of ferrous sulfide scale layer in the production unit will seriously affect its normal operation and use efficiency, and the unit must be shut down for maintenance regularly. During the maintenance process, ferrous sulfide is prone to spontaneous combustion when encountering air, causing fire and explosion accidents, which seriously affects the long-term safe operation of petrochemical plants and poses a great threat to t...

AI Technical Summary

Problems solved by technology

The use of passivation cleaning agents containing sodium hypochlorite can easily generate other toxic and harmful by-products (such as mustard gas) during the cleaning process, causing serious harm to the life safety of on-site workers

However, hydrogen peroxide and other oxidants react with ferrous sulfide to release heat, and a large amount of free oxygen will be generated, and an explosion accident will occur if the control is not proper.