ABSTRACT

With the recent increased development of advanced biofuel and bio-based chemical processing plants, materials selections need to be done for many novel plant designs. Organic acids are one of the corrosion-causing byproducts in these plants, along with aqueous carbonic acids, chlorides, etc. (depending on feedstocks). Since no direct past experiences with some unit designs were available, especially for streams with high organic acid contents, it was necessary to extrapolate from literature data and past "somewhat similar" operating experience to select candidate materials and set up future testing programs. The materials under review include austenitic and duplex stainless steels, and nickel-based alloys. This paper summarizes a review done of the risk of organic acid corrosion, and gives examples of the initial materials selection decisions for various types of biofuels units.

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