The effects of the naphtha physicochemical parameters on its corrosivity

Abstract

Petrochemical naphtha is one of the most aggressive distilled petroleum fractions against carbon steel  pipeline systems presenting, in the absence of inhibitors, the result “E” level when tested according to the  modified NACE TM – 0172-2001 corrosion test. Due to this aggressiveness, naphtha is used as a reference  product in the inhibitor qualification process to be used in the Transpetro pipeline systems. Thus, this test is  used in order to determine the minimum inhibitor concentration which is able to reduce naphtha  corrosiveness to acceptable levels (A or B++). In 2006, during the qualification process, the minimum  inhibitor concentration levels for some petrochemical naphtha samples collected from São Paulo state  refineries were much higher than those recommended by the manufacturers, as suitable to reduce the  naphtha corrosivity to the acceptable levels. In other naphtha samples, a minimum concentration in the  DERD range required for the reduction of their corrosivity was not found. The present project tries to identify the physicochemical parameters of the naphtha that is responsible for its aggressive characteristics and for  the inhibitors negative response.


Reference

PANOSSIAN, Z., POÇO, J.G.R.; PROENÇA, J.L.J.; TIROEL, L.C.O.; GONÇALVES, R.; MORAES, R.H.; NAGAYASSU, V.Y.; PIMENTA, G.S. The effect of the naphta physicochemical paramenters in its corrosivity. In: RIO PIPELINE CONFERENCE AND EXPOSITION, 2009, Rio de Janeiro. Proceedings… (CD-Rom)

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