Horizontal Bitumen Reactor Design for Volatile Hydrocarbon Safety
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Solution Overview
Problem
Existing bitumen modification processes face challenges such as hazardous volatile hydrocarbon accumulation, lengthy residence times, and reduced reaction rates due to inefficient mixing and design flaws in reactors, leading to safety risks and limited flexibility with crude feedstocks.
Innovation Solution
A horizontal reactor with a cylindrical design featuring a bitumen inlet and outlet at opposite side walls, multiple oxygen-containing gas inlets, and a high-shear mixer with rotating rotors and stators for efficient mixing and reduced gas space, allowing for controlled oxygen concentration and uniform distribution of modifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a vertical housing with bitumen inlet and outlet at the bottom is used, then the apparatus structure is simple, but the residence time of bitumen varies and volatile hydrocarbons accumulate in air spaces causing hazardous situations
Solution Approach 1:
The patent inverts the conventional vertical housing design to a horizontal housing configuration. The bitumen inlet is positioned at one end and the outlet at the other end, eliminating dead air spaces where volatile hydrocarbons could accumulate. This inversion of the spatial arrangement resolves the safety hazard while maintaining structural simplicity.
Solution Approach 2:
The patent transitions from a vertical one-dimensional arrangement to a horizontal configuration, changing the spatial dimension of bitumen flow. This dimensional change allows continuous flow through the reactor without creating stagnant zones, thereby preventing volatile hydrocarbon accumulation while maintaining operational simplicity.
2Device complexity
If air is injected at one point in a tubular reactor, then the oxygen concentration is highest at the inlet and gradually depleted along the path, but the driving force for reaction diminishes and reaction rate is further reduced
Solution Approach 1:
The patent segments the single air injection point into multiple air injection points distributed along the horizontal reactor. This segmentation ensures that oxygen is supplied at multiple locations, maintaining a more uniform oxygen concentration and driving force throughout the reactor, thereby sustaining higher reaction rates along the entire bitumen path.
Solution Approach 2:
The patent applies local quality by providing oxygen injection at specific locations along the reactor rather than uniformly or at a single point. This localized oxygen supply at multiple points ensures that each section of the reactor receives adequate oxygen for the oxidation reaction, maintaining reaction drive throughout the process.
3Volume of moving object
If the tubular path involves high pressure drop, then the reactor design is compact, but the throughput capacity of bitumen is limited
Solution Approach 1:
The patent employs dynamic mixing elements (rotors and stators) within the horizontal reactor to enhance mixing efficiency. This dynamic approach improves mass transfer and reaction efficiency without requiring excessive reactor volume or creating high pressure drops, thereby maintaining both compact size and high throughput capacity.
4Volume of stationary object
If small stirrers are used compared to the volume of bitumen, then the reactor volume is large, but lengthy residence time is needed to ensure reaction of all bitumen
Solution Approach 1:
The patent combines multiple functional elements (horizontal flow path, multiple air injection points, and dynamic mixing) into an integrated system. This merging of functions achieves efficient mixing and reaction in a compact horizontal reactor, reducing both the effective reaction volume required and the residence time needed for complete bitumen conversion.
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 solution ensures effective mixing and minimizes volatile hydrocarbon accumulation, reduces reactor size and costs, increases flexibility with various crude feedstocks, and enhances reaction efficiency by maintaining acceptable residence times and throughput.
Implementation Method 1
a high-shear mixer with rotating rotors and stators for efficient mixing
Implementation Method 2
the bitumen may be oxidized with an oxygen-containing gas to produce blown bitumen
Data Source
AI summary
A reactor is provided for the preparation of modified bitumen, which reactor comprises a horizontal housing comprising a cylindrical wall and two side walls, wherein a bitumen inlet has been provided at or near one of the side walls of the housing and a bitumen product outlet has been provided at or near the opposite side wall of the housing, wherein a plurality of inlets for the provision of oxygen-containing gas has been provided in the cylindrical wall of the housing between the bitumen inlet and the bitumen product outlet, which multi-purpose reactor is further provided with a mixer arranged inside the housing comprising at least one rotor rotating within at least one stator having a plurality of openings. Also there is provided a process for the preparation of modified bitumen, which comprises contacting bitumen at elevated temperature and pressure with a modifier in a reactor as herein described.