Anticor type Romanian made corrosion inhibitors for refinery and petrochemical plant equipment

Abstract

The anticorrosion treatment of refinery and petrochemical units in many cases are using corrosion inhibitors. SC ZECASIN‐Brazi is a research and manufacturing company specialised in following products: neutralizers, cathodic inhibitors, organic inhibitors, filmforming inhibitors, antifouling agents, biodispersant agents, inhibitors for chemical decrustation, passivators. The products are manufacturing under the name “ANTICOR”. The corrosion tests have been performed using gravimetric, volumetric, electrochemical and metallographic methods. Recommendations for the continuous use of the inhibitors have been made, based on the results of the laboratory, pilot and industrial scale tests. The effect of using inhibitors mentioned is in 80% decreasing of the corrosion process, and previous localized corrosion and blistering by diffussion of atomic hydrogen.

Crude unit overhead corrosion — pH profile and corrosion rate of carbon steel under controlled condensation

“…From these curves it is possible to observe a transition region, adjacent to the turning points of each test [5]. It is known that the pH range most appropriate to keep the overhead corrosion controlled is from 5.8 to 6.8 [6], with small variations depending on the chemical composition of the medium. But the results of titrations indicated a difficulty in keeping a balanced operation of the proposed corrosion simulator in this track.…”

“…Unlike the gasoline-water mixture used in the theoretical reference [6,7], the system operated with a flask for heating the concentrated solution of hydrochloric acid, and another for a basic solution, used in process plants to neutralize the tower overhead flow (Fig. 2).…”

“…ðFeHÞ ads (6) ðFeHÞ ads þ H þ þ e À ! Fe þ H 2 (7) It is known that even with a good control on the steps of preparing the crude oil in storage tanks and desalting, hydrochloric acid will still be present at the atmospheric tower overhead, which demand proper chemical treatment.…”