Hydrocracking Catalyst for Benzene Co-boiler Conversion
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Solution Overview
Problem
Current hydrocracking processes are unable to effectively convert benzene co-boilers such as 2,4-dimethylpentane and 2,2,3-trimethylbutane into chemical grade benzene, leading to impurities in the product stream and reduced efficiency due to catalyst deactivation.
Innovation Solution
A hydrocracking process using a catalyst comprising a medium pore zeolite with a silica-to-alumina ratio of 20-75 and a hydrogenating metal, deposited on both medium and large pore zeolites, which allows for high conversion of these difficult-to-crack branched alkanes, achieving chemical grade benzene production through simple distillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hydrocracking catalysts are used, then the process is simple, but the conversion of benzene co-boilers (2,4-dimethylpentane and 2,2,3-trimethylbutane) is insufficient leading to impurities in the product stream
Solution Approach 1:
The patent employs a composite catalyst system combining zeolite (with specific pore structure and silica-to-alumina ratio of 20-75) and hydrogenating metal (such as Pt, Pd, Ni, or Cu). This composite material synergistically combines the shape-selective catalysis of zeolite with the hydrogenation activity of the metal, achieving high conversion rates of difficult-to-crack benzene co-boilers while maintaining product purity through selective catalysis.
Solution Approach 2:
The patent utilizes zeolite with specific pore structure (medium pore size) and controlled silica-to-alumina ratio (20-75). The porous structure provides shape-selective catalysis that favors the conversion of benzene co-boilers into desired products while preventing formation of unwanted by-products, thereby achieving both high conversion and high purity simultaneously.
2Reliability
If conventional hydrocracking processes are used, then the operation is straightforward, but catalyst deactivation occurs reducing efficiency over time
Solution Approach 1:
The patent optimizes specific parameters of the catalyst system: zeolite silica-to-alumina ratio (20-75), pore size (medium pore), and hydrogenating metal content and type. These parameter changes create a catalyst that resists deactivation by reducing coking and maintaining active sites, thereby improving both reliability and productivity over extended operation.
3Manufacturing precision
If solvent extraction methods are used to produce chemical grade BTX, then the purity is high, but the process complexity increases and fuel gas production is reduced
Solution Approach 1:
The patent extracts and removes benzene co-boilers (impurities) from the feed stream through selective catalytic conversion in the hydrocracking reactor. By using zeolite with specific pore structure and silica-to-alumina ratio, the process selectively converts co-boilers into desired products, effectively removing impurities before the main separation process, thereby simplifying the overall process while maintaining high purity.
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 process achieves high conversion rates of benzene co-boilers, resulting in chemical grade benzene production with reduced catalyst deactivation, enabling efficient separation and increased purity of benzene in the product stream.
Implementation Method 1
the hydrocarbon feedstock is converted in the presence of a catalyst to aromatic hydrocarbon compounds abundant in BTX through hydrodealkylation and/or transalkylation and to non-aromatic hydrocarbon compounds which are abundant in LPG through hydrocracking
Implementation Method 2
hydrogen is introduced to a reaction zone wherein said hydrocarbon feedstock is converted... through hydrodealkylation and/or transalkylation and to non-aromatic hydrocarbon compounds... through hydrocracking
Implementation Method 3
recovering the aromatic hydrocarbon compounds and LPG, respectively, through gas-liquid separation and distillation
Implementation Method 4
recovering the aromatic hydrocarbon compounds and LPG, respectively, through gas-liquid separation and distillation
Data Source
AI summary
A process for hydrocracking 2,4-dimethylpentane and/or 2,2,3-trimethylbutane can comprise: contacting a hydrocracking feed stream in the presence of hydrogen with a hydrocracking catalyst, wherein the hydrocracking feed stream comprises at least 0.5 wt% of 2,4-dimethylpentane and/or 2,2,3-trimethylbutane, based upon a total weight of the hydrocracking feed stream; and wherein the hydrocracking catalyst comprises a medium pore zeolite having a pore size of 5-6 A and a silica to alumina molar ratio of 20-75; preferably the hydrocracking catalyst comprises a medium pore zeolite having a pore size of 5-6 A and a silica to alumina molar ratio of 20-75 and a large pore zeolite having a pore size of 6-8 A and a silica to alumina molar ratio of 10-80, wherein the hydrogenation metal is deposited on the medium pore zeolite and the large pore zeolite.