A laboratory study has been carried out to identify the key properties of phosphinocarboxylic acid polymers to control boiler water deposits. These multifunctional properties are its ability to: transport iron, disperse boiler water sludge that contains iron oxide, silica and calcium phosphate and dissolution of deposits.

The thermal and hydrolytic stability of the phosphinocarboxylic acid polymers was investigated in autoclave studies up to 1500 psig. The post-autoclave samples were analyzed by Nuclear Magnetic Resonance Spectroscopy and Aqueous Gel Permeation Chromotography to ascertain the polymer integrity. In addition performance tests were carried out for pre- and post-autoclave polymer samples.

The performance testing clearly shows that phosphinocarboxylic acid polymers are effective in maintaining deposit control in a boiler due to their inherent thermal stability.

Subject
Acids, Water, Iron oxide, Additives, Autoclaves, Molecular weight, Iron, Dissolution, Calcium, Sludge, Polymers, Boilers, Deposit corrosion
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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