Managing Silicones in Hydrocarbon Pyrolysis Feed
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Solution Overview
Problem
Pyrolysis processes face challenges with silicon-containing contaminants in hydrocarbon feeds, leading to catalyst deactivation and shortened operating periods, particularly in steam cracking operations where silicones interfere with product separation and upgrading, necessitating frequent catalyst replacement or reactivation.
Innovation Solution
Determining the types and amounts of silicon-containing compositions in the hydrocarbon feed allows for preselection of adequate hydroprocessing catalyst amounts to extend the operation time without catalyst replacement, by converting and managing silicones in the pyrolysis effluent, ensuring continuous hydroprocessing of steam cracker naphtha.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If silicon-containing hydrocarbon feeds are used in pyrolysis processes, then feed availability and economic value are improved, but catalyst deactivation occurs leading to shortened operating periods
Solution Approach 1:
The patent applies preliminary action by determining the silicon content in the hydrocarbon feed before pyrolysis and preselecting an adequate amount of hydroprocessing catalyst based on this measurement. This advance preparation ensures the catalyst can handle the expected silicon load throughout the predetermined period, preventing premature deactivation and extending the operating period between catalyst replacements.
2Productivity
If silicon-containing feeds are pyrolysed, then product supply is improved, but catalyst replacement frequency increases
Solution Approach 1:
The patent implements feedback by measuring the silicon content in the feed and using this information to adjust the catalyst selection and amount. This closed-loop approach ensures the catalyst quantity is optimized for the specific feed composition, extending catalyst life and reducing the frequency of replacements, thereby minimizing downtime and maintaining continuous product supply.
3Device complexity
If conventional pyrolysis processes are used with silicon-containing feeds, then processing simplicity is maintained, but product separation and upgrading are interfered with
Solution Approach 1:
The patent applies preliminary action by determining silicon content in the feed before pyrolysis and preselecting adequate hydroprocessing catalyst based on this measurement. This advance preparation ensures the catalyst can effectively manage silicones in the effluent, maintaining reliable product separation and upgrading without requiring complex additional processing steps.
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
This approach enables prolonged operation of steam cracking processes by maintaining catalyst effectiveness, reducing downtime and maintenance costs associated with catalyst deactivation caused by silicon-containing contaminants.
Implementation Method 1
Pyrolysis processes, e.g., steam cracking, convert relatively low-value hydrocarbon-containing feeds to higher value products
Implementation Method 2
a sufficient amount of at least one catalyst is introduced into a hydroprocessing unit to allow the hydroprocessing unit to hydroprocess the steam cracker naphtha
Implementation Method 3
the steam cracker effluent is separated into a vapor phase product and a liquid phase product
Data Source
AI summary
Processes and systems for pyrolysing a hydrocarbon feed for a predetermined period of time, e.g., by steam cracking. The process can include determining a first amount of silicon material present in the hydrocarbon feed that is to be steam cracked to produce a steam cracker effluent. The process can also include determining a second amount of silicon material that will be present in a steam cracker naphtha that is to be separated from the steam cracker effluent.