Slurry Hydrocracking Catalyst Separation via Vacuum Fractionation
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Solution Overview
Problem
In slurry hydrocracking processes, unconverted pitch with high boiling points and undesired components like sulfur contaminants becomes difficult to utilize due to its high viscosity and catalyst entrapment, leading to low value and costly remediation needs.
Innovation Solution
A process and apparatus that fractionate the effluent to separate the slurry hydrocracking catalyst from the pitch, allowing for recycling of the catalyst and utilization of the pitch as combustion fuel, using filtration, centrifugation, or settling to facilitate catalyst separation and recycling without additional processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the particle size of the slurry catalyst is minimized to facilitate hydrocracking reactions, then the hydrocracking conversion efficiency is improved, but the separation of catalyst from pitch becomes more difficult
Solution Approach 1:
The pitch-catalyst mixture is segmented into distinct phases through vacuum fractionation, separating the catalyst-containing heavy residue from the purified pitch based on boiling point differences and density variations, enabling effective separation despite fine catalyst particle sizes
Solution Approach 2:
A vacuum fractionation column acts as an intermediary device between the hydrocracking reactor and final product separation, using temperature and pressure gradients to facilitate catalyst-pitch separation without requiring additional processing steps
2Quantity of substance
If the pitch is utilized as a valuable commodity such as combustion fuel, then the economic value is improved, but the presence of undesired components like sulfur contaminants and catalyst requires expensive remediation processes
Solution Approach 1:
The vacuum fractionation process converts the harmful mixture of pitch with catalyst and sulfur contaminants into separated streams where the pitch is purified for fuel use and the catalyst is concentrated for recycling, transforming a waste problem into a value-recovery opportunity
Solution Approach 2:
The process discards the catalyst from the pitch stream through vacuum fractionation, recovering the pitch as a clean fuel product while directing the catalyst-containing residue back to the hydrocracking reactor for continued use
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
Enables the effective separation and recycling of the catalyst, allowing the pitch to be used as a valuable fuel, reducing remediation costs and improving the efficiency of the slurry hydrocracking process.
Implementation Method 1
a filtration zone adapted to filter the mixture to provide a retentate including the slurry hydrocracking catalyst and a filtrate including a pitch
Implementation Method 2
utilizing any suitable mechanism, such as filtering, centrifuging, or settling to facilitate catalyst separation
Implementation Method 3
utilizing any suitable mechanism, such as filtering, centrifuging, or settling to facilitate catalyst separation
Data Source
AI summary
One exemplary embodiment can include a slurry hydrocracking process. The process can include combining one or more hydrocarbons and a slurry hydrocracking catalyst as a feed to a slurry hydrocracking reaction zone, fractionating an effluent from the slurry hydrocracking reaction zone, separating the pitch from at least a portion of the slurry hydrocracking catalyst, and recycling the suspension to the slurry hydrocracking reaction zone. The slurry hydrocracking catalyst may include a support. Fractionating the effluent may provide a light vacuum gas oil, a heavy vacuum gas oil, and a mixture comprising a pitch and the slurry hydrocracking catalyst. Generally, the separated slurry hydrocracking catalyst is comprised in a suspension.