Calcium sulfate causes serious scaling problems in many industries because of its limited solubility and the decrease in solubility with increasing temperature. A new inhibitor, polyamino polyether methlyene phosphonate (PAPEMP), very effectively controls calcium sulfate precipitation and deposition. In addition to excellent calcium sulfate precipitation inhibition, there are other properties of PAPEMP such as, high tolerance for calcium, calcium carbonate inhibition at high supersaturation and excellent hydrolytic thermal stability that make this molecule a unique deposit control agent in many industrial applications. The paper compares the performance of the new inhibitor with currently employed calcium sulfate inhibitors. The results of its performance in field application are also discussed.

Subject
Acids, Acid inhibitors, Water, Inhibitor performance, Precipitation (solids), Calcium carbonate, Scale inhibitors, Solubility, Calcium, Acidity, Calcium sulfate, Corrosion inhibitors, Deposit corrosion
Keywords:
calcium sulfate, scale/deposit, phosphonate, calcium carbonate
© 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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