Pt/Bi Zeolite Catalyst for Aromatic Hydrocarbon Separation
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Solution Overview
Problem
Current methods for separating aromatic and non-aromatic hydrocarbons from hydrocarbon feedstocks require additional solvent extraction processes, which are costly and inefficient, and are prone to catalyst deactivation due to coke deposition, limiting the production of high-purity aromatic hydrocarbons and liquefied petroleum gas (LPG).
Innovation Solution
A process using a platinum/bismuth supported zeolite-based catalyst for hydrocracking and dealkylation/transalkylation of hydrocarbon feedstocks, eliminating the need for solvent extraction and minimizing coke deposition by controlling hydrogenation activity, thereby producing high-purity aromatic hydrocarbons and LPG.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solvent extraction process is used to separate aromatic hydrocarbons from non-aromatic hydrocarbons, then high-purity aromatic hydrocarbon mixture can be obtained, but additional solvent extraction equipment is required and solvent should be continuously supplied
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by incorporating specific metal components (platinum, palladium, rhodium, or ruthenium) into the zeolite catalyst. This modification alters the catalyst's hydrogenation activity to selectively convert non-aromatic hydrocarbons into aromatic hydrocarbons while minimizing coke deposition, thereby achieving high-purity aromatic separation without requiring additional solvent extraction equipment
Solution Approach 2:
The patent uses a composite catalyst material combining zeolite support with metal components (platinum, palladium, rhodium, or ruthenium). This composite structure provides both the acidic sites of zeolite for cracking reactions and the hydrogenation activity of metals for converting non-aromatics to aromatics, enabling the process to achieve separation functionality that previously required separate solvent extraction units
2Duration of action of stationary object
If metal component with high hydrogenation activity is supported onto zeolite catalyst to suppress coke deposition, then catalyst lifetime is extended, but aromatic compound is converted into non-aromatic compound through hydrogenation reaction
Solution Approach 1:
The patent applies local quality by creating specific zones within the catalyst structure where metal components are dispersed on the zeolite surface. This localized distribution ensures that hydrogenation activity is concentrated in specific areas, allowing selective conversion of non-aromatic hydrocarbons to aromatic hydrocarbons while preserving the aromatic compounds already present in the feedstock. The local metal-zeolite interaction provides different functional properties in different regions of the catalyst particle
Solution Approach 2:
The patent carefully controls the parameters of metal component loading (0.1-5 wt%), oxidation state, and dispersion on the zeolite surface. By adjusting these parameters, the hydrogenation activity is tuned to selectively hydrogenate non-aromatic compounds (converting them to aromatics) while avoiding over-hydrogenation of aromatic compounds. This parameter optimization extends catalyst lifetime by suppressing coke formation while maintaining aromatic product 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 effectively separates aromatic and non-aromatic components without additional solvent extraction, enhances LPG yield, and maintains catalyst activity, resulting in high-purity aromatic hydrocarbons and economic benefits by converting low-value non-aromatic compounds into LPG.
Implementation Method 1
converting a non-aromatic compound in a hydrocarbon feedstock mixture into a gaseous material which is abundant in LPG through hydrocracking
Implementation Method 2
converting an aromatic compound therein into an oil component including benzene, toluene, xylene, etc., through dealkylation and/or transalkylation
Implementation Method 3
converting an aromatic compound therein into an oil component including benzene, toluene, xylene, etc., through dealkylation and/or transalkylation
Implementation Method 4
controlling the hydrogenation function by the metal component
Data Source
Figure 1
AI summary
Disclosed is a process of preparing aromatic hydrocarbons and liquefied petroleum gas (LPG) from a hydrocarbon mixture, in which a non-aromatic compound in the hydrocarbon feedstock mixture is converted into a gaseous material having a large amount of LPG through hydrocracking, and an aromatic compound therein is converted into an oil component having large amounts of benzene, toluene, and xylene (BTX) through dealkylation and transalkylation, in the presence of a catalyst obtained by supporting platinum/bismuth onto a mixture support having zeolite and an inorganic binder. The gaseous product is separated into LPG and a mixture of methane and ethane depending on differences in boiling point through distillation, while the liquid product is separated into benzene, toluene, xylene, and C9+ aromatic compounds depending on differences in boiling point through distillation.