Y/Beta Zeolite Hydrocracking Catalyst for Naphtha Selectivity
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Solution Overview
Problem
Existing hydrocracking catalysts are not selective enough for naphtha production, leading to inefficiencies in energy consumption and catalyst utilization, particularly when processing less reactive feedstocks.
Innovation Solution
A hydrocracking catalyst comprising a specific ratio of Y zeolite and Beta zeolite, combined with non-noble elements from Groups VIB and VIII, and a porous mineral matrix, optimized for naphtha production by adjusting the zeolite crystal parameters and incorporating hydro-dehydrogenating elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hydrocracking catalysts are used, then general cracking function is provided, but naphtha production selectivity is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the lattice parameter of Y zeolite (24.38-24.50 Å) and the Y/Beta mass ratio (5-12) to optimize naphtha production selectivity. This specific parameter optimization resolves the contradiction by achieving high selectivity without sacrificing overall cracking productivity.
Solution Approach 2:
The patent uses composite materials by combining Y zeolite and Beta zeolite in a specific mass ratio (5-12) to create a bifunctional catalyst. The Y zeolite provides high naphtha selectivity while Beta zeolite maintains general cracking activity, thus resolving the contradiction between selectivity and productivity.
2Loss of energy
If catalysts with high naphtha selectivity are used, then energy consumption is reduced, but activity towards less reactive feedstocks is insufficient
Solution Approach 1:
The patent applies universality by designing a catalyst that performs multiple functions: Y zeolite provides high naphtha selectivity for energy efficiency, while Beta zeolite ensures adequate activity towards less reactive feedstocks. This multi-functional composite catalyst resolves the contradiction between energy loss reduction and reliability maintenance.
3Manufacturing precision
If the Y zeolite lattice parameter is increased to improve naphtha selectivity, then heavy naphtha fraction selectivity increases, but catalyst stability may be affected
Solution Approach 1:
The patent applies parameter changes by optimizing the Y zeolite lattice parameter within a specific range (24.38-24.50 Å) to achieve high heavy naphtha fraction selectivity while maintaining catalyst stability. This controlled parameter optimization resolves the contradiction between manufacturing precision and composition stability.
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 catalyst enhances naphtha production activity and selectivity, reducing activation temperature requirements and extending catalyst life, while maintaining energy efficiency and processing less reactive feedstocks without altering process flow.
Implementation Method 1
Hydrocracking catalysts are generally classified based on the nature of their acid function, in particular catalysts comprising an amorphous acid function of the silica alumina type and catalysts comprising a zeolitic cracking function such as Y zeolite or beta zeolite
Implementation Method 2
a catalyst comprising at least one hydro-dehydrogenating element selected from the group formed by the non-noble elements of Group VIB and Group VIII of the periodic table
Data Source
AI summary
The invention describes a hydrocracking catalyst that is selective with regard to the naphtha cut, and further describes the hydrocracking process using said catalyst. The catalyst comprises at least one hydrogenating-dehydrogenating element selected from the group consisting of group VIB and non-noble group VIII elements of the periodic table, whether taken alone or as a mixture, and a carrier comprising at least one porous mineral matrix, a gamma zeolite having an initial crystal lattice constant a0 strictly greater than 24.42 Å, and a beta zeolite, wherein the weight ratio of said gamma zeolite to said beta zeolite in the catalyst is between 5 and 12.