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Corrosion under Hot Dilute Acidic Pre-Hydrolysis Biorefining Process

Picture for Corrosion under Hot Dilute Acidic Pre-Hydrolysis Biorefining Process
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Hot dilute acidic pre-hydrolysis biorefining is a pre-treatment technology recently developed for converting raw biomass materials into sugar streams and other valuable intermediate chemicals at elevated temperatures. However, corrosion database of steels and alloys in hot dilute acidic solutions are very limited, resulting in the cost-effective selection of materials of construction difficult. Corrosion studies were thus performed to identify suitable alloys of construction and advance the understanding of how alloying elements (e.g., Cr and Mo) present in steels and alloys affect the formation and properties of surface oxides. In this paper, the corrosion performance of three alloys (UNS S31603, UNS S32101 and UNS N06625) in hot dilute sulfuric acids are introduced. The alloys exhibited active general corrosion and even pitting in the hot acidic solutions. Alloy 625 has better resistance to the hot dilute acid compared to SS 316L and duplex 2101. This may be attributed to the higher contents of Mo in the alloy. Long-term tests indicate that their corrosion rates are gradually increased with time. The introduction of 100 ppm Cl- from raw biomass feedstocks into the acid solution only has marginal effect on corrosion. 

Product Number: 51320-15438-SG
Author: Minkang Liu, Yimin Zeng, Xue Han , Jing-Li Luo
Publication Date: 2020
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Picture for Corrosion under Hydrothermal Liquefaction Biorefining Process
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Corrosion under Hydrothermal Liquefaction Biorefining Process

Product Number: 51320-15439-SG
Author: Minkang Liu, Yimin Zeng, Xue Han, Jing-Li Luo
Publication Date: 2020
$20.00

The corrosion modes and extents of three candidate alloys (UNS S31603, UNS S31000 and UNS N06625) was investigated under simulated hydrothermal liquefaction (HTL) conditions. The effect of alkaline catalysts (K2CO3), operating pressure and flow rate on corrosion was also examined. Results indicated that the three alloys underwent general oxidation in hot pressurized water, of which SS 316 exhibited worse corrosion resistance compared to SS 310 and Alloy 625. The addition of K2CO3 resulted in a significant increase in the corrosion rates of the alloys, likely due to the formation of soluble metal hydroxides in basic environment. Environmental loop tests showed that higher operating pressure led to a marginal increase in the corrosion rates of SS 310 and Alloy 625. Increasing flow rate from 9 to 15 had no noticeable effect on the corrosion rates of the alloys in hot pressurized water at 310 C and 10 MPa.  
Picture for 09168 High Temperature Corrosion Under Simulated Biomass Deposit Conditions
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09168 High Temperature Corrosion Under Simulated Biomass Deposit Conditions

Product Number: 51300-09168-SG
ISBN: 09168 2009 CP
Author: Peter Viklund, Jesper Flyg and Rachel F. A. Pettersson
Publication Date: 2009
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Picture for 09261 Evaluation of Alloy Components from a Biomass Gasifier
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09261 Evaluation of Alloy Components from a Biomass Gasifier

Product Number: 51300-09261-SG
ISBN: 09261 2009 CP
Author: James R. Keiser and Bruce A. Pint
Publication Date: 2009
$20.00
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