Most higher severity hydroprocessing units require a continuous water wash upstream of the reactor effluent air cooler (REAC) to mitigate corrosion and fouling from ammonium chloride and/or bisulfide salts. In an informal survey of low severity hydroprocessing units, the water washing practices were inconsistent and the trends showed no relationship to the unit conditions. Some units had no water wash, some used an intermittent wash and some were continuously washing. This paper defines a methodology for evaluating the risk of corrosion and fouling based on the process conditions, and then selecting the appropriate water wash strategy.

Subject
Water, Salts, Tubes, Hydroprocessing, Naphtha, Vapors, Cooling systems, Reactor effluent, Reactor effluent air coolers, Deposit corrosion, Chlorides, Hydrogen, Oil
Keywords:
ammonium bisulfide, ammonium chloride, hydrotreater, reactor effluent, air cooler, underdeposit corrosion, water wash
© 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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