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Corrosivity Of Crude Pyrolysis Oils Made From Different Feedstocks On Transportation And Storage

Picture for Corrosivity Of Crude Pyrolysis Oils Made From Different Feedstocks On Transportation And Storage
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Product Number: 51321-16574-SG
Author: Xue Han/ Yimin Zeng
Publication Date: 2021
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Crude pyrolysis oils can be produced from different forest and agriculture feedstocks via fast, intermediate or slow pyrolysis processes. Although the oils have promising potential for clean energy production, their corrosivity remains as one of the critical challenges for various industrial applications. A number of studies have been done to investigate the corrosion of metallic materials in crude pyrolysis oils and some general conclusions are made. However, the available information is insufficient for the development of Standards and requirements on the safe oil transportation and storage. To fill some knowledge gaps, this study characterizes the corrosivity of a fast pyrolysis oil produced from hardwood and identifies the corrosion modes and extents of typical iron-based steels (carbon steel, low-alloyed steel and stainless steel), which are cost-effective constructional materials used for the storage and transportation of conventional fossil fuels, under simulated operating conditions of crude bio-oils. Corrosion rate measurements results indicate that carbon steel UNS K02700 experiences active corrosion, low-alloyed steel UNS K91560 suffers less severe corrosion, while stainless steel UNS S31603 shows acceptable resistance. Surface roughness from SEM images matches corrosion observations. Chromium is the dominant element in determining corrosion resistance of steels. A thin layer of Cr oxides shall form on UNS S31603 which prevents the steel from acid attack.

Key words: corrosion, crude pyrolysis oil, iron-based steels, transportation and storage

Crude pyrolysis oils can be produced from different forest and agriculture feedstocks via fast, intermediate or slow pyrolysis processes. Although the oils have promising potential for clean energy production, their corrosivity remains as one of the critical challenges for various industrial applications. A number of studies have been done to investigate the corrosion of metallic materials in crude pyrolysis oils and some general conclusions are made. However, the available information is insufficient for the development of Standards and requirements on the safe oil transportation and storage. To fill some knowledge gaps, this study characterizes the corrosivity of a fast pyrolysis oil produced from hardwood and identifies the corrosion modes and extents of typical iron-based steels (carbon steel, low-alloyed steel and stainless steel), which are cost-effective constructional materials used for the storage and transportation of conventional fossil fuels, under simulated operating conditions of crude bio-oils. Corrosion rate measurements results indicate that carbon steel UNS K02700 experiences active corrosion, low-alloyed steel UNS K91560 suffers less severe corrosion, while stainless steel UNS S31603 shows acceptable resistance. Surface roughness from SEM images matches corrosion observations. Chromium is the dominant element in determining corrosion resistance of steels. A thin layer of Cr oxides shall form on UNS S31603 which prevents the steel from acid attack.

Key words: corrosion, crude pyrolysis oil, iron-based steels, transportation and storage

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