This paper presents the results of several analyses and corrosivity testing performed on eight crude oils (West Texas Sour, Kansas, Midway Sunset from California, Ratawi from Kuwait and Brent, Captain, Heimdal and Mariner from the North Sea). Electrospray-Mass Spectrometry analyses are shown to increase the reliability in the analysis for naphthenic acid content as compared to ASTM D664 and Extraction Method. They are also useful in predicting where the acids are concentrating in the distillation unit. Hydrogen sulfide evolution results are compared to the commonly used total sulfur by ASTM D4294 and are shown to provide another predictive tool with temperature versus H2S evolved. The results of the corrosivity tests of the eight crude oils towards carbon steel, 5Cr, 9Cr and 316SS in a rotating cage set-up at 600F are also included. The combined results of this program were analyzed to determine which technique or combination thereof might better predict the high temperature corrosivity of crude oils and what research is still needed to reach that goal.

Subject
Acids, Sulfur, Extraction, Naphthenic acid, Oils, Hydrogen evolution, Corrosivity, Spectroscopy, Corrosion testing, Molecular weight, Distillation, Nitrogen, Crude
Keywords:
Naphthenic Acid Corrosion, Crude Oil Corrosion, Distillation Unit Corrosion, Crude Unit Corrosion, Refinery Corrosion, Hydrogen Sulfide Evolution, Naphthenic Acid Analysis, Electrospray Analysis, High Temperature Oil Corrosion Testing
© 2004 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2004
Association for Materials Protection and Performance (AMPP)
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