Single-Stage Hydroprocessing Catalyst for Nitrogen Poisoning Prevention
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Solution Overview
Problem
Hydrocracking processes require a pre-treatment stage to remove impurities, which restricts reactor capacity and necessitates frequent shutdowns due to nitrogen poisoning of acidic catalysts, especially zeolite catalysts.
Innovation Solution
A process that contacts heavy hydrocarbon feedstock with hydrogen and catalyst in a single stage of a hydroprocessing unit operating at high pressure, performing hydrocracking, hydrodesulfurization, and hydrodenitrogenation, while regenerating spent catalyst without rejuvenation to extend catalyst life and eliminate the need for pre-treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pre-treatment stage is added to remove impurities before hydrocracking, then catalyst activity is prolonged and nitrogen poisoning is prevented, but reactor capacity is restricted and shutdown frequency increases
Solution Approach 1:
The patent combines the pre-treatment function and hydrocracking function into a single reactor vessel and catalyst system. The hydrocracking catalyst is designed to simultaneously perform impurity removal (pre-treatment) and hydrocracking reactions, eliminating the need for a separate pre-treatment reactor and thereby maintaining reactor capacity while protecting catalyst activity.
Solution Approach 2:
The hydrocracking catalyst is designed with multi-functionality to perform both pre-treatment (impurity removal) and hydrocracking functions. This universal catalyst approach allows a single catalyst system to handle both contaminant removal and main reaction, avoiding the productivity loss associated with dedicated pre-treatment reactors.
2Duration of action of stationary object
If a pre-treatment stage is implemented to protect against nitrogen poisoning, then catalyst lifespan is extended, but the number of reactor shutdowns increases
Solution Approach 1:
By merging pre-treatment and hydrocracking into one continuous process within a single reactor, the patent eliminates the need for separate pre-treatment reactor shutdowns. The unified system allows catalyst regeneration without interrupting the overall hydrocracking operation, thereby extending catalyst lifespan while minimizing reactor shutdown time.
Solution Approach 2:
The patent enables continuous operation by integrating pre-treatment and hydrocracking in a single reactor that can maintain steady-state operation. The catalyst system is designed to continuously remove impurities and perform hydrocracking without requiring shutdowns for maintenance, ensuring uninterrupted production and maximizing catalyst utilization.
3Reliability
If feedstock is processed in two stages (pre-treatment and hydrocracking), then catalyst poisoning is prevented, but process complexity increases
Solution Approach 1:
The patent merges the pre-treatment and hydrocracking processes into a single reactor unit with a unified catalyst system. This consolidation reduces the number of reactors, piping systems, and control mechanisms required, thereby simplifying the overall process while maintaining catalyst protection through the integrated impurity removal capability.
Solution Approach 2:
The use of a universal hydrocracking catalyst that performs both pre-treatment and hydrocracking functions reduces process complexity by eliminating the need for separate catalyst systems and process control mechanisms. This multi-functional approach maintains catalyst protection while streamlining the process architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach prolongs catalyst activity, reduces reactor shutdowns, and maintains efficiency by preventing nitrogen poisoning and residue buildup, allowing continuous operation for extended periods without the need for pre-treatment.
Implementation Method 1
contacting heavy hydrocarbon feedstock, wherein the heavy hydrocarbon feedstock is essentially free of residue, and hydrogen with catalyst in a hydroprocessing unit operating at a pressure of greater than or equal to 100 bars
Implementation Method 2
operating at a pressure of greater than or equal to 100 bars
Data Source
AI summary
A process for prolonging catalyst activity may comprise contacting heavy hydrocarbon feedstock, wherein the heavy hydrocarbon feedstock is essentially free of residue, and hydrogen with catalyst in a hydroprocessing unit operating at a pressure of greater than or equal to 100 bars. The process may further comprise performing hydrocracking, hydrodesulfurization, and hydrodenitrogenation in a single stage of the hydroprocessing unit to create a hydroprocessed effluent. The process may further comprise regenerating spent catalyst in a catalyst regeneration unit. Additionally, the process may further comprise passing regenerated catalyst back to the hydroprocessing unit without rejuvenating the spent catalyst.