Crude Oil Conversion via Fractionation and Catalytic Reforming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated refineries face challenges in producing sufficient quantities of light olefins and aromatics, such as benzene, toluene, and xylene, due to limited availability of suitable feedstocks for catalytic reforming processes.
Innovation Solution
A process that fractionates wide boiling range hydrocarbons into four streams, followed by steam cracking, hydrotreating, hydrocracking, and delayed coking, and then catalytic reforming of these streams to maximize the production of aromatic and olefin compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional refinery processes are used, then the production of aromatics and olefins is limited, but the availability of suitable feedstocks for catalytic reforming is also limited
Solution Approach 1:
The patent segments the crude oil feedstock into four distinct fractions based on boiling point ranges: light stream (C1-C6), medium-light stream (C6-C12), medium-heavy stream (C12-C40), and heavy stream (C40+). Each fraction is then processed through different unit operations optimized for its specific composition, allowing maximum conversion to aromatics and olefins while utilizing the full range of feedstock materials that would otherwise be unsuitable for conventional catalytic reforming.
Solution Approach 2:
The patent applies different processing parameters and conditions to each fraction stream. For example, the light stream undergoes steam cracking at specific temperature and residence time conditions, while the medium-heavy and heavy streams undergo hydrocracking and delayed coking with different catalyst types, temperatures, and pressures. This parameter optimization allows each fraction to be converted to the desired products with maximum efficiency.
2Quantity of substance
If catalytic reforming is applied to all hydrocarbon streams, then aromatic production increases, but not all streams are suitable for direct reforming
Solution Approach 1:
The patent divides the hydrocarbon feed into four streams based on molecular weight and boiling point, then applies different processing methods to each stream according to its suitability for catalytic reforming. The light stream (C1-C6) is too light for direct reforming and undergoes steam cracking, while the medium-light (C6-C12), medium-heavy (C12-C40), and heavy (C40+) streams are progressively more suitable for reforming and undergo hydrocracking and delayed coking respectively. This segmentation allows each stream to be processed through the most appropriate unit operation.
Solution Approach 2:
The patent applies preliminary processing steps to prepare streams for catalytic reforming. The medium-heavy and heavy streams undergo hydrocracking and delayed coking before reforming to convert them into more suitable feedstocks. The light stream undergoes steam cracking to produce olefins that can be subsequently reformed. These preliminary actions transform unsuitable feedstocks into suitable reforming feedstocks, maximizing aromatic production.
3Quantity of substance
If the process includes multiple unit operations for each stream, then product yield increases, but process complexity increases
Solution Approach 1:
The patent segments the processing of different hydrocarbon fractions into separate parallel streams, each with dedicated unit operations. The light stream goes through steam cracking, while the medium-light, medium-heavy, and heavy streams go through hydrocracking and delayed coking, with the heavy stream also undergoing fractionation. This segmentation allows optimized processing of each fraction while maintaining clear process boundaries and reducing interference between units.
Solution Approach 2:
The patent designs the process so that the catalytic reformer serves as a universal unit that receives and processes multiple different feedstock streams (steam-cracked light stream, hydrocracked medium-heavy stream, and delayed-coked heavy stream). This multi-functionality allows the reformer to maximize aromatic production from diverse feedstocks while consolidating what would otherwise be separate processing lines into a single versatile unit.
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 configuration significantly increases the production of aromatic and olefin compounds, addressing the shortage of suitable feedstocks and enhancing the efficiency of catalytic reforming processes.
Implementation Method 1
fractionating the wide boiling range hydrocarbons into four streams
Implementation Method 2
steam cracking the fractions
Implementation Method 3
hydrotreating the fractions
Implementation Method 4
hydrocracking the fractions
Implementation Method 5
delayed coking the fractions
Implementation Method 6
catalytic reforming of the each of the processed streams
Data Source
AI summary
A method of processing a hydrocarbon feed may comprise fractionating the hydrocarbon feed into a light stream, a medium-light stream, a medium-heavy stream, and a heavy stream; passing the medium-heavy stream to a hydrocracker to produce a hydrocracked medium-heavy stream; passing the heavy stream to a delayed coker to produce a cracked heavy stream; and passing the medium-light stream, the hydrocracked medium-heavy stream, and the cracked heavy stream to a catalytic reformer to produce an aromatics stream.