Integrated HSFCC Crude Oil Cracking for Higher Light Olefin Yield
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Solution Overview
Problem
The increasing demand for light olefins and light aromatic compounds in the petrochemical industry is not adequately met by existing refinery processes, particularly in terms of production efficiency and yield.
Innovation Solution
An integrated process incorporating a high severity fluidized catalytic cracking (HSFCC) system with a dual-downer configuration, including a feed separator, multiple FCC units, and subsequent separation and processing systems to produce light olefins and aromatics, such as ethylene, propylene, benzene, toluene, and xylenes, through a series of refining steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional refinery FCC processes are used, then existing production capacity is maintained, but the increasing demand for light olefins and light aromatic compounds cannot be adequately met
Solution Approach 1:
The FCC unit is divided into multiple parallel FCC units (first FCC unit and second FCC unit) with different catalyst types. The first FCC unit uses a catalyst optimized for light olefin production while the second FCC unit uses a catalyst optimized for light aromatic production, allowing the system to segment the production function to meet diverse demand requirements
Solution Approach 2:
The system dynamically adjusts the feed distribution between multiple FCC units and incorporates a bypass stream that can be routed to different FCC units based on real-time demand for light olefins versus light aromatics, enabling flexible adaptation to changing market requirements
2Productivity
If high severity fluidized catalytic cracking is applied, then conversion of crude oil to light olefins is improved, but process complexity increases
Solution Approach 1:
The HSFCC system is segmented into multiple parallel FCC units, each with optimized catalysts for specific product types. This segmentation allows high severity cracking to be applied selectively in different units, improving overall conversion efficiency while distributing the operational complexity across multiple standardized modules
Solution Approach 2:
The HSFCC system is designed with multi-functionality where the same basic FCC unit structure can operate with different catalyst types to produce different product distributions. The bypass stream provides universal flexibility to route feed to any FCC unit, reducing the need for separate dedicated systems for different production goals
3Adaptability or versatility
If multiple FCC units with different catalysts are used, then product distribution is optimized, but device complexity increases
Solution Approach 1:
The system segments the FCC process into multiple units, each with specialized catalysts for specific product types (light olefins vs. light aromatics). This segmentation enables optimized product distribution while maintaining modular architecture that simplifies management
Solution Approach 2:
Instead of using fundamentally different process configurations, the system optimizes product distribution by changing catalyst parameters (type, activity, selectivity) within the same FCC unit framework. This approach achieves superior product distribution while minimizing the increase in overall device complexity
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 achieves at least 60 wt.% conversion of crude oil to light olefins and enhances the production of light aromatic compounds, improving the overall yield and efficiency of petrochemical production.
Implementation Method 1
processing a crude oil in a high severity fluidized catalytic cracking (HSFCC) system to produce an HSFCC effluent
Implementation Method 2
subjecting the light saturated hydrocarbon effluent to steam cracking in a pyrolysis cracking system to produce a cracking reaction effluent comprising ethylene, propylene, or both
Implementation Method 3
separating the HSFCC effluent in a separation system to produce, a light products effluent, a mixed C4 effluent, a naphtha effluent, and a heavy effluent
Implementation Method 4
passing the light products effluent to an olefin separation system that separates the light products effluent to produce a C2-C3 olefin effluent and a light saturated hydrocarbon effluent
Implementation Method 5
reforming the naphtha effluent in a naphtha reforming system to produce a reformate comprising a greater concentration of light aromatic compounds compared to the naphtha effluent
Data Source
AI summary
Integrated processes for converting a crude oil to light olefins and light aromatics includes processing a crude oil in a high severity fluidized catalytic cracking (HSFCC) system that includes two reactors, and separating a HSFCC effluent to produce a light products effluent, a mixed C4 effluent, a naphtha effluent, and a heavy effluent. The process includes separating the light products effluent in an olefin separation system into a light olefin effluent and a light saturated hydrocarbon effluent and subjecting the light saturated hydrocarbon effluent to steam cracking. The method further includes passing the mixed C4 effluent to a C4 processing system to produce light olefins. The process includes reforming the naphtha effluent to produce a reformate and recovering mixed xylenes from the reformate. The process includes passing a portion of the heavy effluent to a heavy oil processing system to produce light cycle oil and heavy cycle oil.