...Abstract Crude oils with a total acid number (TAN) higher than 0.5 are highly corrosive at temperatures between 400 and 700°F found in atmospheric and vacuum distillations of oil refineries. The destructive effects of naphthenic acids (NAP) occur in the same temperature range as sulfidation...

...Abstract Opportunity crudes frequently have increased acidity, making high temperature naphthenic acid (NAP) corrosion a key concern for their processing in refineries. Lab corrosion rates are hard to interpret due to either variable composition of crude fractions or the use of commercially...

...Naphthenic acids and chemical structure Naphthenic acids refer to a group of organic molecules composed of cycloaliphatic rings with an attached carboxylic acid group. Naphthenic acids are represented by a general formula R(CH₂)_nCOOH, where R indicates an alkyl group...

...Studies have reported cases in which significant variations in corrosiveness can be obtained with the same TAN, depending on the chemical makeup of naphthenic acids. This indicates that other variables are present in the process. Studies suggest that the structure of the acid species...

...The complex composition of crude oil makes it difficult to evaluate accurately its corrosive behavior in laboratory tests.^{[ 5 ], [ 6 ]} Therefore, it is more feasible to investigate the corrosion processes on a lab scale by using model sulfur compounds, and model naphthenic acids...

...Abstract At temperatures between 220 and 400°C, naphthenic acid and sulfur-containing species present in many global crudes are known to cause refinery corrosion. Naphthenic acids are organic acids often described as cycloalkane ring(s) with an attached aliphatic chain having a terminal carboxylic...

... was discredited. For the same TAN value, molecular size and structure of the acid were shown to have an important influence. Abstract The aim of this work is to define the corrosiveness of naphthenic acids and to examine a non-phosphorus corrosion inhibitor for low temperature (~ 200°C) naphthenic acid corrosion...

... International, Italy section, the authors collected and examined more than 150 papers dealing with naphthenic acid corrosion, and high temperature crude oil corrosion, which were used to prepare a data base. The knowledge of literature and the analysis of structure can be useful for predicting the behavior...

... naphthenic acids sulfur species natural inhibition opportunity crudes processing strategy risk mitigation INTRODUCTION For any refinery that takes on a more corrosive crude diet, either in the form of “opportunity crude processing” or by changing to a “alternate crude slate” the goal is improved...

...Abstract Venezuelan crudes can contain levels of naphthenic acids that cause corrosion in distillation units designed for sweet crudes. This naphthenic acid corrosion can be mitigated in several ways, the most common of which is selective alloying. This paper will provide information from field...

... NMP naphthenic acids INTRODUCTION The original Amuay lube plant was a patented design and license. The extraction medium to improve the viscosity index, color, oxidation resistance and sludge forming tendency was phenol. PTAY-1, the first extraction train was started up in 1958, a second extraction...