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Effect Of Varying H2S Content On High Temperature Corrosion Of Austenitic Alloys In A Pyrolysis Process Of Post-Consumer Plastics

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Pyrolysis processes of post-consumer plastics are a promising chemical recycling route and a good alternative to disposal. Nevertheless, these processes are challenging for metallic materials since chlorine containing materials or biological components inside the feedstock can yield HCl and H2S, respectively, during cracking. In combination with high temperatures of the reactor zone metallic construction materials can be attacked by high-temperature corrosion.

Product Number: 51322-17552-SG
Author: Manuela Nimmervoll, Roland Haubner, Gregor Mori, Stefan Hönig
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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Several austenitic alloys were tested under conditions simulating a pyrolysis process of post-consumer plastics. Impurities in the plastic feedstock like chlorine containing materials or organic components yield HCl and H2S, respectively, during the cracking process. The reactor material must be able to withstand these harsh corrosive conditions.

To evaluate the applicability of commonly used construction materials, high-temperature corrosion experiments were performed in lab-scale test equipment at 580 °C for 240 hours. The gas atmosphere consisted of either 0.02 vol% or 2 vol% H2S and 3.8 vol% HCl, 1.9 vol% CO2, 0.3 vol% CO, 2.8 vol% H2, balance N2, denoted as low-H2S and high-H2S mixture, respectively. After the corrosion experiments the samples were analyzed by metallography, SEM/EDX and XRD. Additionally, the corrosion rates were evaluated.

Results showed that the corrosion rates of the materials increased with rising H2S content in the gas atmosphere. Additionally, the corrosion behavior of the materials changed when going from the low-H2S mixture to the high-H2S mixture. In the low-H2S mixture the alloying element nickel was identified to be helpful for corrosion protection. In the high-H2S mixture chromium was beneficial alloying element against corrosive attack at the given conditions.

Several austenitic alloys were tested under conditions simulating a pyrolysis process of post-consumer plastics. Impurities in the plastic feedstock like chlorine containing materials or organic components yield HCl and H2S, respectively, during the cracking process. The reactor material must be able to withstand these harsh corrosive conditions.

To evaluate the applicability of commonly used construction materials, high-temperature corrosion experiments were performed in lab-scale test equipment at 580 °C for 240 hours. The gas atmosphere consisted of either 0.02 vol% or 2 vol% H2S and 3.8 vol% HCl, 1.9 vol% CO2, 0.3 vol% CO, 2.8 vol% H2, balance N2, denoted as low-H2S and high-H2S mixture, respectively. After the corrosion experiments the samples were analyzed by metallography, SEM/EDX and XRD. Additionally, the corrosion rates were evaluated.

Results showed that the corrosion rates of the materials increased with rising H2S content in the gas atmosphere. Additionally, the corrosion behavior of the materials changed when going from the low-H2S mixture to the high-H2S mixture. In the low-H2S mixture the alloying element nickel was identified to be helpful for corrosion protection. In the high-H2S mixture chromium was beneficial alloying element against corrosive attack at the given conditions.

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