Grating Section Mitigates Fouling in Hydrocarbon Extraction
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Solution Overview
Problem
Current liquid-liquid extraction techniques for separating aromatic hydrocarbons from non-aromatic hydrocarbons face inefficiencies due to light impurity buildup and fouling in extractive distillation towers, leading to reduced disengaging times and ineffective recovery of aromatic compounds.
Innovation Solution
The proposed apparatus and method involve a housing with distinct sections, including sieve trays, gratings, and packing materials, where the grating section provides additional coalescing surface area and open area to mitigate fouling, allowing for effective separation of aromatic and non-aromatic hydrocarbons through a solvent extraction process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sieve trays are used in extractive distillation towers, then separation of aromatic compounds can be achieved, but light impurities buildup and fouling occur, reducing disengaging times
Solution Approach 1:
The extractor is divided into three distinct sections: a first section with sieve trays for initial separation, a second section with gratings for coalescing, and a third section with wire mesh screens for final separation. This segmentation allows each section to perform a specific function, preventing fouling from affecting the entire system and maintaining separation efficiency.
Solution Approach 2:
The grating section acts as an intermediary between the sieve trays and wire mesh screens, providing a coalescing surface that prevents light impurities from reaching and fouling the downstream components. This intermediary structure protects the separation system from harmful fouling effects.
2Object-generated harmful factors
If operating rates are reduced to prevent fouling, then light impurity buildup decreases, but productivity and aromatic compound recovery capacity are reduced
Solution Approach 1:
By segmenting the extractor into three functional sections, the system can maintain higher operating rates while preventing fouling. The grating section handles coalescing of light impurities, allowing the sieve trays and wire mesh screens to operate at high rates without accumulating fouling, thus maintaining both productivity and controlling impurity buildup.
Solution Approach 2:
Different sections of the extractor have different structural qualities optimized for their specific functions: sieve trays for initial separation, gratings for coalescing with high open area to handle impurities, and wire mesh screens for fine separation. This local optimization allows high operating rates throughout the system without fouling accumulation.
3Reliability
If more stages of sieve trays are added during downtime, then separation capacity increases, but device complexity and maintenance requirements increase
Solution Approach 1:
The system uses three distinct sections with different structures rather than uniformly increasing sieve tray stages throughout. This segmentation provides the necessary separation capacity through specialized components (gratings and wire mesh screens) without the complexity and maintenance burden of adding numerous sieve tray stages.
Solution Approach 2:
The invention changes the structural parameters of the extractor by introducing gratings with high open area and wire mesh screens, rather than simply increasing the number of sieve tray stages. This parameter change achieves enhanced separation capacity with lower device complexity and easier maintenance.
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 enhances the separation efficiency by recovering a raffinate with a majority of non-aromatics and a rich solvent with a majority of aromatics, reducing fouling and improving the overall performance of the extraction process.
Implementation Method 1
liquid-liquid extraction techniques have been used. Such extraction techniques typically use a solvent which exhibits a higher affinity for the aromatic compounds to selectively extract the aromatic compounds from the mixture of aromatics and non-aromatics
Implementation Method 2
one or more gratings can be disposed in the second section... Each grating has a plurality of openings formed therethrough... providing additional coalescing surface area
Data Source
AI summary
Apparatus and methods for liquid-liquid extraction. The apparatus can include a housing having a first section, second section, and third section. One or more sieve trays can be disposed in the first section, and one or more gratings can be disposed in the second section. A hydrocarbon feed inlet can be disposed adjacent the second section, wherein each grating has a plurality of openings formed therethrough. The openings having at least three sides. The first section can be disposed at a first end of the second section, and the third section can disposed at a second end of the second section.