In-Situ Oxidation Procedure for High and Low Temperature Shift Catalysts

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In-Situ Oxidation Procedure for High and Low Temperature Shift Catalysts

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In-Situ Oxidation Procedure for High and Low Temperature Shift Catalysts

  1. 1. GBH Enterprises, Ltd. In-Situ Oxidation Procedure for High and Low Temperature Shift Catalysts Process Information Disclaimer Information contained in this publication or as otherwise supplied to Users is believed to be accurate and correct at time of going to press, and is given in good faith, but it is for the User to satisfy itself of the suitability of the Product for its own particular purpose. GBHE gives no warranty as to the fitness of the Product for any particular purpose and any implied warranty or condition (statutory or otherwise) is excluded except to the extent that exclusion is prevented by law. GBHE accepts no liability for loss, damage or personnel injury caused or resulting from reliance on this information. Freedom under Patent, Copyright and Designs cannot be assumed. Refinery Process Stream Purification Refinery Process Catalysts Troubleshooting Refinery Process Catalyst Start-Up / Shutdown Activation Reduction In-situ Ex-situ Sulfiding Specializing in Refinery Process Catalyst Performance Evaluation Heat & Mass Balance Analysis Catalyst Remaining Life Determination Catalyst Deactivation Assessment Catalyst Performance Characterization Refining & Gas Processing & Petrochemical Industries Catalysts / Process Technology - Hydrogen Catalysts / Process Technology – Ammonia Catalyst Process Technology - Methanol Catalysts / process Technology – Petrochemicals Specializing in the Development & Commercialization of New Technology in the Refining & Petrochemical Industries Web Site: www.GBHEnterprises.com
  2. 2. In-Situ Oxidation Procedure - High and Low Temperature Shift Catalysts GBHE recommends the following procedure for the controlled oxidation of either an HTS or an LTS alone or an HTS in series with an LTS. 1. Remove and isolate all combustibles (e.g., feed gas or recycle synthesis gas) from the process by purging. 2. While purging the system, cool the HTS to 400oF and the LTS to 350oF with a steam or nitrogen flow at a space velocity of 600-1000 hr-1. NOTE: During this step, some catalyst oxidation will occur as evidenced by H2 present in the steam samples. 3. Meter 1% air into the steam ahead of the HTS. Expected delta T is 55oF per 1% air for the HTS and 25oF per 1% air for the LTS catalyst. 4. After 30 minutes, when the HTS bed exotherm has stabilized (still holding LTS inlet @ 350oF) increase air to 3%. 5. Continue to stepwise increase air addition pausing to monitor maximum bed exotherms. Since catalyst is to be discharged, mechanical or vessel temperature limitations are the primary concern. 6. When the temperature rise has passed completely through both the HTS and LTS beds, and inlet air rate is 7-10% the metered steam flow, the oxidation is considered complete. 7. Steam flow may be stopped and the catalyst cooled in air and discharged. Estimated time to totally oxidize both the HTS and LTS catalyst beds for air discharge is approximately 12 hours. Refinery Process Stream Purification Refinery Process Catalysts Troubleshooting Refinery Process Catalyst Start-Up / Shutdown Activation Reduction In-situ Ex-situ Sulfiding Specializing in Refinery Process Catalyst Performance Evaluation Heat & Mass Balance Analysis Catalyst Remaining Life Determination Catalyst Deactivation Assessment Catalyst Performance Characterization Refining & Gas Processing & Petrochemical Industries Catalysts / Process Technology - Hydrogen Catalysts / Process Technology – Ammonia Catalyst Process Technology - Methanol Catalysts / process Technology – Petrochemicals Specializing in the Development & Commercialization of New Technology in the Refining & Petrochemical Industries Web Site: www.GBHEnterprises.com
  3. 3. Refinery Process Stream Purification Refinery Process Catalysts Troubleshooting Refinery Process Catalyst Start-Up / Shutdown Activation Reduction In-situ Ex-situ Sulfiding Specializing in Refinery Process Catalyst Performance Evaluation Heat & Mass Balance Analysis Catalyst Remaining Life Determination Catalyst Deactivation Assessment Catalyst Performance Characterization Refining & Gas Processing & Petrochemical Industries Catalysts / Process Technology - Hydrogen Catalysts / Process Technology – Ammonia Catalyst Process Technology - Methanol Catalysts / process Technology – Petrochemicals Specializing in the Development & Commercialization of New Technology in the Refining & Petrochemical Industries Web Site: www.GBHEnterprises.com

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