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51315-5885-Behavior of Super-austenitic Stainless Alloy (UNS N08020) in Sulfuric Acid Alkylation Plant

Picture for Behavior of Super-austenitic Stainless Alloy (UNS N08020) in Sulfuric Acid Alkylation Plant
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Product Number: 51315-5885-SG
ISBN: 5885 2015 CP
Author: Saad Al Dhafiri
Publication Date: 2015
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The sulfuric acid alkylation process chemically combines isobutene with a low octane olefin (usually a mixture of propylene and butylene) in the presence of sulfuric acid catalyst to yield higher octane alkylate product used in blending gasoline pool. Corrosion is primarily driven by sulfuric acid and esters formed in the process.Materials of construction in the plant are generally carbon steel although austenitic stainless steels like SS 316 UNS N08020 are used selectively to resist acid corrosion. Temperature and flow velocity have a direct relationship to corrosion rates. Operational control of these process variables in combination with mechanical design is important to minimize corrosion rate even in an super-austenitic alloy like UNS N08020.This paper describes the frequent failures of super-austenitic stainless alloy UNS N08020 in effluent treatment section of the plant its active-passive corrosion behavior and mitigation measures taken to improve plant reliability integrity and safety.Key words: Alkylation plant sulfuric acid carbon steel SS316 UNS N08020 frequent failures and plant reliability.
The sulfuric acid alkylation process chemically combines isobutene with a low octane olefin (usually a mixture of propylene and butylene) in the presence of sulfuric acid catalyst to yield higher octane alkylate product used in blending gasoline pool. Corrosion is primarily driven by sulfuric acid and esters formed in the process.Materials of construction in the plant are generally carbon steel although austenitic stainless steels like SS 316 UNS N08020 are used selectively to resist acid corrosion. Temperature and flow velocity have a direct relationship to corrosion rates. Operational control of these process variables in combination with mechanical design is important to minimize corrosion rate even in an super-austenitic alloy like UNS N08020.This paper describes the frequent failures of super-austenitic stainless alloy UNS N08020 in effluent treatment section of the plant its active-passive corrosion behavior and mitigation measures taken to improve plant reliability integrity and safety.Key words: Alkylation plant sulfuric acid carbon steel SS316 UNS N08020 frequent failures and plant reliability.
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