USY Zeolite Catalyst for Second-Stage Hydrocracking
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Solution Overview
Problem
Existing second-stage hydrocracking catalysts do not provide optimal levels of activity for producing high-quality middle distillates, resulting in lower yields and increased production of lesser value products.
Innovation Solution
A second-stage hydrocracking catalyst comprising 40-70 wt% zeolite USY with an ASDI of 0.05-0.18, amorphous silica alumina, a second alumina, and 0.1-10 wt% noble metal, with a BET surface area of 450-650 m2/g, is used to enhance catalytic activity and selectivity for producing middle distillates and heavy naphtha.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If earlier second-stage hydrocracking catalysts are used, then good yields of middle distillate and heavy naphtha are achieved, but the activity level is lower than optimal
Solution Approach 1:
The patent applies parameter changes by precisely controlling the ASDI of zeolite USY within 0.03-0.20, the SiO2/Al2O3 ratio within 2.0-5.0, and the noble metal content within 0.05-5.0 wt%. These parameter optimizations enhance catalyst activity while maintaining product quality, directly resolving the contradiction between productivity and reliability.
Solution Approach 2:
The patent uses composite materials by combining zeolite USY with amorphous silica alumina and noble metals (Pt, Pd, Rh, Ir, or Ru) in specific ratios. This composite structure synergistically improves both catalytic activity and selectivity for middle distillate production, achieving optimal productivity without compromising product quality.
2Productivity
If catalyst activity is increased to produce high quality middle distillates, then productivity improves, but operational costs increase
Solution Approach 1:
The patent optimizes operational parameters by maintaining ASDI between 0.03-0.20 and noble metal content at 0.05-5.0 wt%, which enables high productivity at lower operating temperatures and pressures. This reduces energy consumption and operational costs while maintaining high middle distillate production rates.
Solution Approach 2:
The patent implements self-service through extended catalyst life achieved by optimizing the SiO2/Al2O3 ratio and noble metal dispersion. The catalyst maintains high activity for longer periods, reducing the frequency of catalyst replacement and associated operational costs, thereby achieving economic efficiency alongside high productivity.
3Productivity
If zeolite USY with higher ASDI is used to increase activity, then conversion efficiency improves, but selectivity for middle distillate decreases
Solution Approach 1:
The patent precisely controls the ASDI parameter within 0.03-0.20 to balance conversion efficiency and selectivity. This optimized range ensures sufficient hydrocracking activity while maintaining high selectivity for middle distillate products, resolving the contradiction between productivity and manufacturing precision.
Solution Approach 2:
The patent applies local quality by creating specific active sites through controlled dealumination of zeolite USY, where only certain regions of the catalyst possess the optimal acid strength and pore structure. This localized optimization of catalyst properties simultaneously enhances conversion efficiency and maintains product selectivity for middle distillate.
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 significantly increases activity and selectivity for producing middle distillates and heavy naphtha, extending catalyst life and reducing operational costs by maintaining conversion at lower temperatures, thereby optimizing hydrocracking process efficiency.
Implementation Method 1
a second-stage hydrocracking catalyst comprising: from 40 wt % to 70 wt % of a zeolite USY having an ASDI from 0.05 to 0.18; an amorphous silica alumina; a second alumina; and 0.1 to 10 wt % noble metal
Implementation Method 2
wherein the second-stage hydrocracking catalyst has a BET surface area from 450 to 650 m2/g
Data Source
AI summary
A second-stage hydrocracking catalyst is provided comprising:a. from 40 wt % to 70 wt % of a zeolite USY having an ASDI from 0.05 to 0.18;b. an amorphous silica alumina;c. a second alumina; andd. 0.1 to 10 wt % noble metal; wherein the second-stage hydrocracking catalyst has a BET surface area from 450 to 650 m2/g. A second-stage hydrocracking process is provided comprising using the second-stage hydrocracking catalyst to produce middle distillate. A method for making the second-stage hydrocracking catalyst is also provided.