Integrated Steam and Fluid Catalytic Cracking for Crude Oil Conversion
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Solution Overview
Problem
Current processes for converting crude oil to petrochemicals and fuel products are limited by the availability and quality of feedstocks, leading to high costs and energy intensiveness, with a need for improved methods that leverage economies of scale and offer higher value chemical production opportunities.
Innovation Solution
An integrated process involving atmospheric and vacuum distillation, followed by hydroprocessing and fluid catalytic cracking, and mixed feed steam cracking, to produce petrochemicals such as ethylene, propylene, and aromatics, utilizing a combination of distillate hydroprocessing, fluid catalytic cracking, and steam cracking to optimize feedstock utilization and product yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If steam pyrolysis is used to produce lower olefins and aromatics, then these basic chemical intermediates can be formed, but the process becomes costly and energy-intensive due to limited feedstock availability
Solution Approach 1:
The patent combines steam cracking and fluid catalytic cracking processes into an integrated system where multiple feedstocks (naphtha, VGO, and gas oil) are processed simultaneously. The FCC unit processes heavier fractions that would otherwise require extensive preprocessing, while the steam cracker handles lighter fractions, creating a synergistic system that improves overall feedstock utilization and reduces energy consumption per unit of product.
Solution Approach 2:
The integrated process design allows the system to handle multiple types of feedstocks (light naphtha, heavy naphtha, vacuum gas oil, and gas oil) through a combination of processing units. The FCC unit can process a wide range of heavy feedstocks, while the steam cracker processes lighter fractions, creating a multi-functional system that is not limited by feedstock availability and quality variations.
2Quantity of substance
If heavy naphtha is used as feedstock for ethylene production, then feedstock availability is improved, but the quality is lower due to reduced paraffin and increased aromatics content
Solution Approach 1:
The patent segments the feedstock processing by directing different fractions to different processing units. Light naphtha with higher paraffin content is directed to the steam cracker for optimal ethylene production, while heavy naphtha and vacuum gas oil are directed to the FCC unit. This segmentation allows each unit to process feedstocks within its optimal range, maintaining product quality while utilizing the full spectrum of available feedstocks.
Solution Approach 2:
The FCC unit acts as an intermediary that converts heavy naphtha and gas oil fractions into lighter hydrocarbons and aromatics, which are then available for further processing or direct use. This intermediary conversion process enables the system to utilize lower-quality heavy feedstocks while still producing high-value chemical intermediates.
3Quantity of substance
If oil refinery by-products are used as feed for chemicals production, then feedstock supply is constrained by refinery capacity, but this reliance creates economic limitations due to high refining costs and fuel market competition
Solution Approach 1:
The patent changes the economic parameters by processing lower-value heavy feedstocks (VGO and gas oil) that are typically used for fuel production. By converting these heavy fractions into chemical intermediates through FCC and integrated processing, the system creates higher-value chemical products from feedstocks that would otherwise have limited economic value in the fuel market, thereby improving overall economic viability.
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 integrated process enhances the conversion of crude oil into valuable petrochemicals and fuels efficiently, optimizing feedstock use and reducing costs by leveraging economies of scale, thereby improving the economic viability of petrochemical production.
Implementation Method 1
an initial separation step to separate from a crude oil feed in an atmospheric distillation zone
Implementation Method 2
A vacuum gas oil fraction is separated from the atmospheric residue fraction in a vacuum distillation zone
Implementation Method 3
The fraction(s) from the atmospheric distillation with straight run naphtha and lighter components, and an aromatics extraction zone raffinate are processed in a mixed feed steam cracking zone
Implementation Method 4
The vacuum gas oil fraction is processed in a fluid catalytic cracking zone to produce at least a light olefins FCC fraction
Data Source
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AI summary
Process scheme configurations are disclosed that enable conversion of crude oil feeds with several processing units in an integrated manner into petrochemicals. The designs utilize minimum capital expenditures to prepare suitable feedstocks for the steam cracker complex. The integrated process for converting crude oil to petrochemical products including olefins and aromatics, and fuel products, includes mixed feed steam cracking and fluid catalytic cracking. Feeds to the mixed feed steam cracker include light products and naphtha from hydroprocessing zones within the battery limits, recycle streams from the C3 and C4 olefins recovery steps, and raffinate from a pyrolysis gasoline and FCC naphtha aromatics extraction zone within the battery limits.