Hydroprocessing Catalyst Organic Modification for Desulfurization
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Solution Overview
Problem
Current hydroprocessing catalysts based on refractory oxides and group VIB and VIII metals face challenges in maintaining high desulfurization and denitrogenation activity, especially after regeneration, leading to increased costs and environmental concerns due to restrictive fuel sulfur standards.
Innovation Solution
A hydroprocessing catalyst comprising a refractory oxide carrier with group VIII and VIB metals, premodified with organic compounds containing carboxylic ester functions, which enhances desulfurization and denitrogenation activity after sulfurization, allowing for reduced reaction temperatures and extended catalyst recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydroprocessing catalysts based on refractory oxides and group VIB and VIII metals are used, then basic hydroprocessing function is provided, but desulfurization and denitrogenation activity is insufficient and activity drops significantly after regeneration
Solution Approach 1:
The catalyst is premodified with organic compounds containing carboxylic ester functions before sulfurization and use. This preliminary modification creates specific surface sites that enhance desulfurization and denitrogenation activity and improve the catalyst's ability to maintain activity after regeneration cycles
Solution Approach 2:
The invention changes the chemical composition parameters of the catalyst by introducing organic compounds with carboxylic ester groups. This modification alters the surface properties and active site characteristics, enabling improved performance in desulfurization and denitrogenation while maintaining stability after regeneration
2Productivity
If new high-performance catalysts are used to achieve better desulfurization and denitrogenation, then purification effectiveness increases, but catalyst cost increases significantly and availability decreases
Solution Approach 1:
The invention modifies the chemical parameters of conventional, readily available catalysts by introducing organic compounds containing carboxylic ester functions. This parameter change transforms standard catalysts into high-performance catalysts capable of achieving deep desulfurization and denitrogenation without requiring expensive proprietary materials
Solution Approach 2:
The approach copies the high-performance characteristics of expensive proprietary catalysts by applying organic modification to conventional catalyst formulations, achieving similar or superior performance through a more accessible and cost-effective pathway
3Productivity
If conventional catalysts are used to meet restrictive sulfur standards, then basic hydroprocessing is achieved, but catalyst activity in desulfurization and denitrogenation cannot be significantly increased, leading to premature catalyst disposal
Solution Approach 1:
The organic premodification is performed before catalyst deployment, creating enhanced active sites that maintain high desulfurization and denitrogenation activity throughout extended service periods and multiple regeneration cycles, delaying the need for catalyst replacement
Solution Approach 2:
By changing the chemical composition and surface properties through organic compound introduction, the catalyst achieves sustained high activity in desulfurization and denitrogenation, extending its operational lifespan and recyclability under restrictive sulfur standards
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 modified catalysts demonstrate improved desulfurization and denitrogenation performance, enabling the production of hydrocarbons with sulfur contents below 10 ppm, reducing reactor temperatures and extending unit operational life.
Implementation Method 1
A hydroprocessing catalyst comprising a carrier based on at least one refractory oxide, at least one metal of group VIII and at least one metal of group VIB of the Periodic Table of Elements, characterized in that it also comprises at least one organic compound comprising at least two carboxylic ester functions
Implementation Method 2
All hydroprocessing or hydrocracking catalysts containing metals in the oxide state, in order to be active, must necessarily be sulfurized before use. This sulfurization can be carried out either in situ in the hydroprocessing reactor of the refinery, or ex situ
Data Source
AI summary
The invention relates to a hydrocarbon hydroprocessing catalyst comprising a support based on at least one refractory oxide, at least one metal from group VIII and at least one metal from group VIB. The inventive catalyst is characterized in that it also comprises at least one organic compound having formula (I) or (II) in which each R1 represents independently an alkyl group at C1-18, an alkenyl group at C2-18, an aryl group at C6-18, a cycloalkyl group at C3-8, an alkylaryl or arylalkyl group at C7-20, or the two R1 groups together form a divalent group at C2-18, and R2 represents an alkylene group at C1-18, an arylene group at C6-18, a cycloalkylene group at C3-7, or a combination of same. The invention also relates to a method of preparing one such catalyst and to the use thereof for hydroprocessing or hydrocracking.