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US 2011/0079542 A1Published application
Stacking of low activity or regenerated catalyst above higher activity catalyst
AssigneeExxonMobil Research and Engineering Company
InventorsEdward S. Ellis, Rohit Vijay, Matthew Bennett
Life of this patent
Estimating the term…
Abstract
Processes are provided for using employing lower activity hydrodesulfurization catalysts while achieving a desired product sulfur content. After determining effective reaction conditions for hydrodesulfurization using a reference catalyst system, an upstream portion of the catalyst system can be replaced with a lower activity upstream portion. The process allows tailored product sulfur levels to be achieved using reaction conditions similar to those for the reference catalyst system.
Claims20
A method for treating a distillate feed with a plurality of hydrodesulfurization catalysts, comprising:
- determining effective reaction conditions for processing a distillate feed with a first catalyst, including a temperature, a pressure, a ratio of hydrogen treat gas volume to feed volume, and a liquid hourly space velocity, the effective reaction conditions being suitable to form a distillate product having a target sulfur content of about 100 wppm of sulfur or less;
- providing a first volume of the first catalyst;
- providing a second volume of a second catalyst, the first volume and second volume comprising a combined volume, the second catalyst having a hydrodesulfurization activity from about 75% to about 90% of a hydrodesulfurization activity of the first catalyst, the first volume being from about 50% to about 90% of the combined volume;
- and
- processing the distillate feed under second reaction conditions that are substantially similar to at least the temperature, the pressure, the ratio of treat gas rate volume to feed volume, and the liquid hourly space velocity of the effective reaction conditions, the distillate feed contacting the second volume of catalyst prior to the first volume of catalyst, to produce a distillate product having a sulfur content within about 10 wppm of the target sulfur content.
2 more elements
A method for treating a distillate feed with a plurality of hydrodesulfurization catalysts, comprising:
- determining effective reaction conditions for processing a distillate feed with a first catalyst system, including a temperature, a pressure, a ratio of hydrogen treat gas volume to feed volume, and a liquid hourly space velocity, the effective reaction conditions being suitable to form a distillate product having a target sulfur content of about 100 wppm of sulfur or less, the first catalyst system including an upstream volume portion and a downstream volume portion, the downstream volume portion being about 50% to about 90% of a combined volume of the upstream volume and downstream volume;
- providing the downstream volume portion of the first catalyst system;
- providing a second catalyst system having a hydrodesulfurization activity from about 75% to about 90% of a hydrodesulfurization activity of the upstream volume portion of the first catalyst system;
- and
- processing the distillate feed in the reaction system under second reaction conditions that are substantially similar to at least the temperature, the pressure, the ratio of treat gas rate volume to feed volume, and the liquid hourly space velocity of the effective reaction conditions, the distillate feed contacting the second catalyst system prior to the first downstream volume portion of the first catalyst system, to produce a distillate product having a sulfur content within about 10 wppm of the target sulfur content.
2 more elements
A method for treating a distillate feed with a plurality of hydrodesulfurization catalysts, comprising:
- determining effective reaction conditions for processing a distillate feed with an effective volume of a first catalyst system, the effective reaction conditions including a temperature, a pressure, and a ratio of hydrogen treat gas volume to feed volume, and a liquid hourly space velocity, the effective reaction conditions being suitable to form a distillate product having a sulfur content of about 50 wppm of sulfur or less, the first catalyst system including an upstream volume portion and a downstream volume portion, the downstream volume portion of the first catalyst system having a volume about 50% to about 90% of a combined volume of the upstream volume and downstream volume;
- providing the downstream volume portion of the first catalyst system;
- providing a second catalyst system, the second catalyst system having a hydrodesulfurization activity from about 75% to about 90% of a hydrodesulfurization activity of the upstream volume portion of the first catalyst system, the second catalyst system having a volume about 105% or less of the upstream volume;
- and
- processing the distillate feed under second reaction conditions that are substantially similar to at least the temperature, the pressure, the ratio of treat gas rate volume to feed volume, and the liquid hourly space velocity of the effective reaction conditions, to produce a distillate product having a sulfur content of about 50 wppm or less.
2 more elements
Dependencies are inferred from the claim text.