Layered Catalyst Bed Layout for Runaway-Resistant Hydrotreatment

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Solution Overview

Problem

Self-supported catalysts in hydroprocessing are prone to run-away temperature increases due to excessive heat generation, leading to irreversible coke deactivation, while supported catalysts have lower hydrogenation power per reactor volume.

Innovation Solution

A layered catalyst reactor system with alternating layers of supported and self-supported catalysts, including demetallization, hydrotreating, and hydrocracking catalysts, is designed to mitigate temperature risks and enhance activity and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If self-supported catalysts are used to increase hydrogenation power per reactor volume, then catalyst activity and efficiency are improved, but the risk of run-away temperature increases and coke deactivation worsens

Engineering Contradiction:

Improvehydrogenation power per reactor volumeVSAvoidtemperature control stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The catalyst bed is segmented into multiple functional layers with different catalyst types (demetallization, supported hydrotreating, self-supported hydrotreating, hydrocracking) arranged in a specific sequence. This segmentation allows each layer to perform its specific function while collectively managing heat generation and distribution, preventing localized run-away temperature increases in self-supported catalyst layers

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the catalyst bed are assigned different catalyst properties - supported catalysts with lower hydrogenation activity in certain positions, and self-supported catalysts with high hydrogenation power in other positions. This local differentiation optimizes the balance between overall activity and localized temperature control, allowing self-supported catalysts to operate safely

Inventive Principle:

Principle #3Local quality

2Reliability

If supported catalysts are used to protect from excessive hydrogenation activity, then temperature control is improved, but hydrogenation power per reactor volume decreases

Engineering Contradiction:

Improvetemperature control stabilityVSAvoidhydrogenation power per reactor volume

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system merges both supported and self-supported catalysts into a single integrated reactor bed, combining the temperature stability advantage of supported catalysts with the high activity advantage of self-supported catalysts. The layered configuration ensures that supported catalyst layers provide thermal stability while self-supported layers contribute hydrogenation power, achieving both goals simultaneously

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The layered catalyst system performs multiple functions within a single reactor: demetallization, hydrotreating, hydrocracking, and temperature regulation. Different catalyst layers serve different purposes, with supported catalysts providing both processing function and thermal stability, while self-supported catalysts provide high activity in controlled quantities

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

The layered system effectively reduces the risk of temperature increases and enhances the hydrotreatment process by maintaining controlled temperatures and improving catalyst activity without increasing reactor volume.

Implementation Method 1

Catalytic hydroprocessing refers to petroleum refining processes in which a carbonaceous feedstock is brought into contact with hydrogen and a catalyst, at a higher temperature and pressure, for the purpose of removing undesirable impurities and/or converting the feedstock to an improved product

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

Hydrotreating processes are used to remove impurities, such as sulfur, nitrogen and oxygen

Methodology Applied

Scientific EffectHydrogenation: Hydrogenation

Implementation Method 3

Self-supported catalysts are more susceptible to localized 'run-away' temperature increases than supported catalysts. Such run-away temperature increases occur when a hydrogenation catalyst generates more heat than its surroundings can absorb

Methodology Applied

Scientific EffectExothermic Reaction: Exothermic Reaction

Data Source

PatentEP4384315B1Layered catalyst reactor systems and processes for hydrotreatment of hydrocarbon feedstocks

Publication Date: 2025.11.19 CHEVRON USA INC

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AI summary

A layered catalyst reactor system and process for hydrotreatment of hydrocarbon feedstocks. The layered catalyst system reactors comprise vertical bed layers including a demetallization catalyst layer, multiple layers of supported hydrotreating catalyst layer, and multiple alternating layers of supported hydrocracking catalysts and self-supported hydrotreating catalysts. The arrangement of the catalyst layers mitigates the risk of temperature run-aways, with improvements in hydrotreatment performance.