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Corrosion Properties Of Alloy 35Mo In Crude Distillation Unit Overhead Service Conditions

Picture for Corrosion Properties Of Alloy 35Mo In Crude Distillation Unit Overhead Service Conditions
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Product Number: 51321-16833-SG
Author: Karen Picker; Josefin Eidhagen; Jonas Howing
Publication Date: 2021
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$20.00
$20.00

Overhead condensers (OHC) in refinery applications such as atmospheric and vacuum distillation units
often experience very corrosive environments due to condensation of hydrochloric acid, HCl. The acid is
often neutralized using water washing and addition of a caustic solution such as ammonia (NH3) or an
organic amine such as monoethanolamine (MEA) or dimethylethanolamine (DMEA). While neutralizing
the HCl, addition of these bases can lead to chloride salt deposits with following possible pitting corrosion,
under deposit corrosion and stress corrosion cracking of the tubes in the OHC. In this work, the recently
developed grade UNS N08935 has been tested in a laboratory environment mimicking ammonium
chloride under-deposit corrosion and aqueous acidic corrosion in OHC applications. The results from the
testing will compare the performance of N08935 to super duplex stainless steel UNS S32750 and nickel
base alloy UNS N06625 being exposed to different temperatures, HCl and NH3 concentrations and flow
rates representative of crude unit overhead condenser operating conditions.

Overhead condensers (OHC) in refinery applications such as atmospheric and vacuum distillation units
often experience very corrosive environments due to condensation of hydrochloric acid, HCl. The acid is
often neutralized using water washing and addition of a caustic solution such as ammonia (NH3) or an
organic amine such as monoethanolamine (MEA) or dimethylethanolamine (DMEA). While neutralizing
the HCl, addition of these bases can lead to chloride salt deposits with following possible pitting corrosion,
under deposit corrosion and stress corrosion cracking of the tubes in the OHC. In this work, the recently
developed grade UNS N08935 has been tested in a laboratory environment mimicking ammonium
chloride under-deposit corrosion and aqueous acidic corrosion in OHC applications. The results from the
testing will compare the performance of N08935 to super duplex stainless steel UNS S32750 and nickel
base alloy UNS N06625 being exposed to different temperatures, HCl and NH3 concentrations and flow
rates representative of crude unit overhead condenser operating conditions.

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 The purpose of this paper will be to: (a) review published literature to characterize and classify speciation related to the types of impurities encountered in opportunity crudes; and (b) describe and categorize published case studies of corrosion in crude unit overhead operations.
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