Integrated Crude Oil Conversion Process for Petrochemicals
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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 steam cracking, to separate and convert crude oil into petrochemicals like ethylene, propylene, and aromatics, utilizing multiple processing zones such as distillate hydroprocessing, gas oil hydrocracking, and mixed feed steam cracking to optimize feedstock utilization and product recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If steam pyrolysis is used to produce lower olefins and aromatics, then 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 pyrolysis with hydrocracking processes to create an integrated system where multiple feedstocks (naphtha, gas oil, vacuum gas oil) can be processed together. This merging allows the system to overcome feedstock limitations by utilizing various crude oil fractions that would otherwise require separate processing, thereby reducing overall energy intensity and costs.
Solution Approach 2:
The integrated process design enables multiple functions: the same facility can process different feedstocks (naphtha, gas oil, vacuum gas oil) and produce both chemical intermediates (ethylene, propylene, aromatics) and fuel products. This multi-functionality allows flexible adaptation to feedstock availability while maintaining economic efficiency.
2Quantity of substance
If heavy naphtha is used as feedstock for ethylene production, then feedstock supply is improved, but production efficiency decreases due to lower paraffin and higher aromatics content
Solution Approach 1:
The patent applies preliminary hydrocracking treatment to heavy naphtha before steam pyrolysis. This pre-processing step converts the problematic heavy naphtha with low paraffin content into lighter, more suitable feedstocks, thereby improving subsequent ethylene production efficiency while utilizing the abundant heavy naphtha supply.
Solution Approach 2:
The integrated process changes the chemical parameters of heavy naphtha through hydrocracking, transforming its composition from low-paraffin/high-aromatics to a more suitable composition for efficient ethylene production, while maintaining the ability to use heavy naphtha as feedstock.
3Quantity of substance
If refinery by-products are used as feed for chemicals production, then feedstock availability is improved, but economic value decreases due to high refining costs and narrow refinery margins
Solution Approach 1:
The patent merges chemical production and fuel production into a single integrated process. By combining steam pyrolysis with hydrocracking, the system can simultaneously produce chemical intermediates and fuel products from the same feedstock, thereby distributing refining costs across multiple valuable outputs and improving overall economic value.
Solution Approach 2:
The integrated facility serves multiple functions: producing both chemical intermediates (ethylene, propylene, aromatics) and fuel products from the same feedstock. This multi-functionality allows the system to maximize the economic value of refinery by-products by creating multiple revenue streams from a single feedstock input.
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 value of refinery products.
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
In a distillate hydroprocessing ('DHP') zone, such as a diesel hydrotreater, at least a portion of the middle distillates are processed to produce a naphtha fraction and a diesel fuel fraction
Implementation Method 4
The vacuum gas oil fraction (and optionally all or a portion of an atmospheric gas oil fraction, or all or a portion of a heavy atmospheric gas oil fraction) is processed in a gas oil hydrocracking zone
Implementation Method 5
Thermal cracking, or steam pyrolysis, is a major type of process for forming these materials, typically in the presence of steam, and in the absence of oxygen
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 gas oil steam 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 aromatics extraction zone within the battery limits. Feeds to the gas oil steam cracker include unconverted oil intermediates from vacuum gas oil hydrotreating.