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Converting Hydroprocessing Equipment To Produce Renewable Diesel From Soybean And Corn Oil: Corrosion And Materials Considerations

Converting Hydroprocessing Equipment to Produce Renewable Diesel from Soybean and Corn Oil: Corrosion and Materials Considerations
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As governments around the world seek to promote the adoption of lower-carbon fuels, credits are available for fuels which satisfy various low-carbon or renewable fuels standards.  In the United States, the most common standards discussed include California’s Low Carbon Fuels Standard1 and the US EPA’s Renewable Fuel Standard2. These standards define the acceptable methods (called pathways) for conversion of renewable feeds into consumer fuel products. In order for a producer to be eligible for credits, one of the acceptable pathways must be used. The most common pathway presently being used or considered by most facilities is hydrotreating.

Product Number: 51322-17989-SG
Author: Nathaniel Sutton, Ken Kirkham
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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$20.00
$20.00

Around the globe, refiners are seeking to convert an increasing portion of existing Hydroprocessing capacity to process renewable feedstocks. Facilities face economic pressure to bring renewables production online quickly, in order to take advantage of the current government incentives (credits) for renewable fuels. Simultaneously, however, materials and corrosion engineers face a lack of data-based guidance regarding the appropriate materials selection and expected damage mechanisms for renewables processing units. This paper discusses many of the major damage mechanisms which are considered most relevant in different areas of the RDU – Renewable Diesel Unit (e.g., feed, hot effluent, cooled effluent, etc.). Significant attention is devoted to fatty acid corrosion in the feed system, and lower-temperature aqueous acid corrosion in the cool effluent system. Specific considerations must be made when an existing unit is converted into an RDU, compared to new construction. The source and precise blend of renewable feeds and the extent (if any) co-processing with conventional petroleum feeds impact the susceptibility to certain damage mechanisms throughout the unit. Upstream pretreatment processes can have unique implications on the expected corrosion in the RDU.

Around the globe, refiners are seeking to convert an increasing portion of existing Hydroprocessing capacity to process renewable feedstocks. Facilities face economic pressure to bring renewables production online quickly, in order to take advantage of the current government incentives (credits) for renewable fuels. Simultaneously, however, materials and corrosion engineers face a lack of data-based guidance regarding the appropriate materials selection and expected damage mechanisms for renewables processing units. This paper discusses many of the major damage mechanisms which are considered most relevant in different areas of the RDU – Renewable Diesel Unit (e.g., feed, hot effluent, cooled effluent, etc.). Significant attention is devoted to fatty acid corrosion in the feed system, and lower-temperature aqueous acid corrosion in the cool effluent system. Specific considerations must be made when an existing unit is converted into an RDU, compared to new construction. The source and precise blend of renewable feeds and the extent (if any) co-processing with conventional petroleum feeds impact the susceptibility to certain damage mechanisms throughout the unit. Upstream pretreatment processes can have unique implications on the expected corrosion in the RDU.

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