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Effect of Temperature on Corrosion in Saturated Ammonium Chloride Solution

Product Number: 51324-20856-SG

Author: Matthieu Regniere; Christophe Mendibide; Rikard Norling

Publication Date: 2024

$40.00

The highly corrosive behavior of ammonium chloride (NH4Cl) is known to originate from its intrinsic hygroscopic nature. Refining and co-processing process units for biofuels are often exposed to highly concentrated NH4Cl solution either resulting from water vaporization from an HCl and NH3 containing solution when the temperature increases or salt deposition from vapor phase when the temperature drops. For the latter case, once it reacts with water vapor present in the process, the deposited NH4Cl salts forms a concentrated and corrosive solution through deliquescence (unlike in conventional refinery). Consequently, severe pitting and localized corrosion are reported in hydrogenation and fluid cracking units. Therefore, studying corrosion resistance alloys (CRA) compatibility in the presence of concentrated NH4Cl salt solution is crucial to mitigate corrosion in the process. This paper reports the experimental evaluation of corrosion resistance of different CRAs, based on corrosion rate and stress corrosion cracking, exposed to saturated NH4Cl solution in the temperature range of 130-220°C.

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Establishing Corrosion Management Strategies for Hydroprocessing Unit Using CMP and IOW at Project Stage

Product Number: MPWT19-14452

Author: Ick Soo Kim, Dong Hun yang, Gupta Anurag, Zahrani, Abdulrhman A

Publication Date: 2019

$0.00

At the project phase, the main responsibility of a corrosion engineer is to develop Corrosion Management Program (CMP) and establish a corrosion control strategy for specific individual units. A well-designed Corrosion Management Program is the most useful material not only to prepare a corrosion control strategy, create a reliable inspection plan but also to promote corrosion knowledge management, corrosion talent development and training, integration with other disciplines such as process, operation, inspection, maintenance.
The Hydroprocessing unit is the crucial process of the refinery as high temperature and high-pressure operation conditions are in which major catastrophic accident occurs. An understanding of variables influencing corrosion in hydroprocessing units is necessary for corrosion engineers to improve the reliability, safety and environment impact associated with them. This paper describes an example of how Corrosion Management Program (CMP) and Integrity Operating Windows (IOW) are used for developing specific corrosion control strategy, corrosion knowledge sharing and integration with other disciplines to prepare customized corrosion control strategy of hydroprocessing unit in JAZAN project. The development of corrosion management strategy of Hydroprocessing is focused on the Reactor Effluent Air Cooler system corrosion control using a water-washing method.

Products tagged with 'nh4cl'

Effect of Temperature on Corrosion in Saturated Ammonium Chloride Solution

Establishing Corrosion Management Strategies for Hydroprocessing Unit Using CMP and IOW at Project Stage

Association for Materials Protection and Performance