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Corrosion Of Reactor Alloys Under Simulated Partially Thermal Cracking Of Oilsands Bitumen

Picture for Corrosion Of Reactor Alloys Under Simulated Partially Thermal Cracking Of Oilsands Bitumen
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Product Number: 51321-16575-SG
Author: Xue Han/ Yimin Zeng
Publication Date: 2021
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$20.00
$20.00

Bitumen partial upgrading methods (such as thermal treatment with diluent addition) have been developed to achieve significant economic and environmental benefits. Among them, thermal cracking is seen as a cost-effective pathway and a number of investigations have been done for optimizing cracking processes. However, little work is performed to study the corrosion under the partially thermal cracking of bitumen feedstocks, in which the involved environment chemistry is quite different from those of complete cracking processes at refining plants. Thus, this study focuses on the corrosion modes and extent of typical reactor alloys (including carbon steel UNS K02700 and stainless steel UNS S31603) in a bench top reactor under simulated partially thermal cracking processes of bitumen. Sulfidation seems to be a major mechanism for gas phase corrosion. Scale spallation likely occurs on UNS K02700 samples exposed to gas phase. The samples contacting liquid phase are covered by coke-like substances which to some extent inhibit severe damage of underneath samples. Fe oxides and Fe sulfides might form on the surface of oil-corroded UNS K02700. A thin protective surface layer is observed on UNS S31603 corroded in liquid phase, which possibly prevents the substrate from further corrosion.

Key words: corrosion, bitumen, partial thermal-cracking, refinery reactor alloys

Bitumen partial upgrading methods (such as thermal treatment with diluent addition) have been developed to achieve significant economic and environmental benefits. Among them, thermal cracking is seen as a cost-effective pathway and a number of investigations have been done for optimizing cracking processes. However, little work is performed to study the corrosion under the partially thermal cracking of bitumen feedstocks, in which the involved environment chemistry is quite different from those of complete cracking processes at refining plants. Thus, this study focuses on the corrosion modes and extent of typical reactor alloys (including carbon steel UNS K02700 and stainless steel UNS S31603) in a bench top reactor under simulated partially thermal cracking processes of bitumen. Sulfidation seems to be a major mechanism for gas phase corrosion. Scale spallation likely occurs on UNS K02700 samples exposed to gas phase. The samples contacting liquid phase are covered by coke-like substances which to some extent inhibit severe damage of underneath samples. Fe oxides and Fe sulfides might form on the surface of oil-corroded UNS K02700. A thin protective surface layer is observed on UNS S31603 corroded in liquid phase, which possibly prevents the substrate from further corrosion.

Key words: corrosion, bitumen, partial thermal-cracking, refinery reactor alloys

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