Furan Recovery via Furfural Absorption and Distillation
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Solution Overview
Problem
The existing methods for producing furan from furfural face challenges in efficiently separating furan from undesirable by-products like carbon monoxide, leading to material losses and contamination, which hampers the production of valuable derivatives such as tetrahydrofuran (THF) and 1,4-butanediol.
Innovation Solution
A process involving the decarbonylation of furfural using a catalyst, followed by absorption of the gaseous reaction product stream with a solvent stream containing furfural, and subsequent distillation to separate furan, allowing for the reuse of furfural in the decarbonylation reaction and minimizing distillation duty.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If furan is recovered from the gas stream by condensation after compression and cooling, then furan can be separated from the reaction products, but due to the low boiling point of furan it is difficult to reclaim essentially all furan from the gas stream
Solution Approach 1:
The patent uses an absorption medium (water or organic solvent) as an intermediary substance to transfer furan from the gas stream to the liquid phase. This intermediary enables complete furan recovery by forming a liquid absorbate that can be easily separated and processed, overcoming the limitations of direct condensation methods.
Solution Approach 2:
The patent changes the physical state parameters of furan by absorbing it into a liquid medium, transforming it from a gas phase component that is difficult to completely condense into a liquid-phase absorbate. This parameter change enables complete recovery regardless of furan's low boiling point.
2Reliability
If deep removal of carbon monoxide from the furan stream is performed, then carbon monoxide poisoning of catalysts is prevented, but the process complexity and cost increase
Solution Approach 1:
The patent selectively extracts carbon monoxide from the reaction gas stream using the absorption medium, which preferentially absorbs furan while leaving carbon monoxide in the gas phase. This separation takes out the harmful component (CO) without requiring complex additional processing steps.
Solution Approach 2:
The patent converts the harmful effect of carbon monoxide (catalyst poisoning) into a beneficial separation mechanism by utilizing the differential solubility of furan and CO in the absorption medium. The CO that would otherwise be harmful is easily removed in the gas phase, while the valuable furan is captured in the liquid phase.
3Manufacturing precision
If conventional solvents like benzene, toluene or xylene are used for furan absorption, then furan can be separated from the gas stream, but the solvents require recycling and the process becomes more complex
Solution Approach 1:
The patent uses water as an inexpensive, non-toxic absorption medium that does not require recycling. After absorbing furan, the water-based absorbate can be directly processed through distillation or other separation methods without the need for complex solvent recovery systems, effectively treating the absorption medium as a single-use or easily regenerated material.
Solution Approach 2:
The patent employs water, which is readily available and requires no external recycling infrastructure. The absorption process itself serves the dual purpose of separation and concentration, eliminating the need for separate solvent recovery and recycling units that would be required for organic solvents.
4Manufacturing precision
If compression to greater than 1.5MPa is applied to the gas stream for condensation, then furan condensation is enhanced, but the energy consumption and equipment requirements increase
Solution Approach 1:
The patent uses an absorption medium as an intermediary that enables furan transfer at low pressures. The absorption process occurs efficiently at atmospheric or near-atmospheric pressures, eliminating the need for high-pressure compression equipment and the associated energy consumption.
Solution Approach 2:
The patent changes the separation mechanism from pressure-dependent condensation to concentration-dependent absorption. This parameter change allows efficient furan recovery at low pressures by utilizing the solubility characteristics of furan in the absorption medium rather than relying on high-pressure condensation.
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 method effectively recovers furan with minimal loss and contamination, reducing the distillation burden and enabling the efficient production of furan and its derivatives like THF and 1,4-butanediol, while maintaining a closed-loop system for furfural recycling.
Implementation Method 1
contacting furfural with a decarbonylation catalyst in a decarbonylation reactor to produce a gaseous decarbonylation reaction product stream comprising furan and carbon monoxide
Implementation Method 2
contacting said gaseous decarbonylation reaction product stream with a solvent stream comprising furfural; absorbing at least a portion of the furan present in the gaseous decarbonylation reaction product stream into the solvent stream
Implementation Method 3
separating the furan from the furan containing solvent stream by distillation to provide a first furan stream
Data Source
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AI summary
The present invention provides a process for the production of furan, said process comprising the steps of: i) contacting furfural with a decarbonylation catalyst in a decarbonylation reactor to produce a gaseous decarbonylation reaction product stream comprising furan and carbon monoxide; ii) contacting said gaseous decarbonylation reaction product stream with a solvent stream comprising furfural; iii) absorbing at least a portion of the furan present in the gaseous decarbonylation reaction product stream into the solvent stream to provide a furan-containing solvent stream and a gaseous stream comprising carbon monoxide; iv) separating the furan from the furan containing solvent stream by distillation to provide a first furan stream; and v) using at least a portion of the remaining solvent stream comprising furfural as at least a portion of the furfural provided to the decarbonylation reactor.