Selective Hydrogenation Catalyst with Optimized Acid Distribution
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Solution Overview
Problem
Existing methods for selective hydrogenation of unsaturated compounds face challenges with the instability of polyunsaturated compounds and the formation of heavy sulphides, which affect the efficiency and flexibility of the process.
Innovation Solution
A catalyst comprising Group VIB and Group VIII non-noble metals supported on an alumina carrier, with optimized surface acid distribution and sulphurization conditions, is used to selectively hydrogenate unsaturated compounds, increasing the weight of light sulphides and promoting isomerization of monounsaturated compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If polyunsaturated compounds are stored and processed, then they can be hydrogenated into monounsaturated compounds, but they are easy to be polymerized due to unstable properties
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by incorporating specific amounts of Group VIB and Group VIII metals, and controlling the sulphurization degree to 40-60%. This parameter optimization allows the catalyst to selectively hydrogenate polyunsaturated compounds while minimizing polymerization reactions, thus improving both conversion rate and compound stability during processing.
Solution Approach 2:
The patent introduces sulphur as an intermediary substance that modifies the catalyst surface properties. By controlling the sulphurization degree, the catalyst achieves optimal selectivity for hydrogenation while suppressing unwanted polymerization. The sulphur acts as a mediator between the metal catalyst and the polyunsaturated compounds, enabling selective reaction pathways.
2Productivity
If hydrogenation catalyst is used to convert polyunsaturated compounds into monounsaturated compounds, then conversion efficiency improves, but heavy sulphides are generated which require additional fractionation
Solution Approach 1:
The patent optimizes the sulphurization degree parameter to a specific range of 40-60%, which fundamentally changes the catalyst's chemical state. At this optimized sulphurization level, the catalyst promotes hydrogenation reactions while suppressing the formation of heavy sulphides. This parameter control transforms the harmful side reaction into a manageable process, reducing heavy sulphide generation without sacrificing hydrogenation efficiency.
Solution Approach 2:
The patent employs a carrier with controlled porosity to support the metal catalyst. The porous structure provides selective mass transfer pathways that favor the formation and desorption of light sulphides while preventing the formation of heavy sulphides. The pore size distribution acts as a physical filter that influences reaction selectivity and product distribution.
3Manufacturing precision
If the sulphurization degree of the catalyst is increased to improve selectivity, then light sulphide weight increases, but the catalyst may become less active for hydrogenation
Solution Approach 1:
The patent identifies and optimizes the sulphurization degree as a critical parameter, setting it within the range of 40-60%. This optimized parameter range achieves the optimal balance between selectivity and activity. At this sulphurization level, the catalyst maintains sufficient hydrogenation activity while maximizing the production of light sulphides. The parameter optimization resolves the trade-off by finding the sweet spot where both requirements are satisfied simultaneously.
Solution Approach 2:
The patent creates a composite catalyst system combining Group VIB and Group VIII metals on a porous carrier, with controlled sulphurization. This composite structure synergistically combines the properties of different metals and the carrier material, achieving both high selectivity for light sulphides and maintained hydrogenation activity. The composite nature allows different components to perform different functions, resolving the contradiction between selectivity and activity.
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 enhances the conversion rates of unsaturated compounds, improves the stability of monounsaturated compounds through isomerization, and maintains low hydrogenation of monounsaturated compounds to saturated compounds, offering increased operational flexibility and higher selectivity.
Implementation Method 1
a catalyst having at least one Group VIB metal and at least one Group VIII non-noble metal supported on a carrier is used in the method
Implementation Method 2
comprising performing isomerization reaction of monounsaturated compounds when the selective hydrogenation occurs
Data Source
AI summary
The present invention relates to a method for the selective hydrogenation of an unsaturated compound, particularly a method in an unsaturated compound or a mixture containing unsaturated compounds for increase of the light sulphides weight, hydrogenation of a polyunsaturated compound and isomerization of a monounsaturated compound. The method uses a supported catalyst. The supported catalyst contains at least one Group VIB non-noble metal oxide and at least one Group VIII non-noble metal oxide deposited on a carrier; and the catalyst has an optimized acid distribution on the surface of the catalyst, and more preferably has an optimized Group VIII/VIB metal ratio and a Group VIII non-noble metal density per unit of catalyst surface area.