CMF-to-Alkoxymethylfurfural Conversion With Low-Temperature Extraction
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Solution Overview
Problem
Existing processes for converting 5-(chloromethyl)furfural (CMF) to 5-(alkoxymethyl)furfural (e.g., MMF or EMF) face issues of thermal degradation due to solvent evaporation, and there is a need for a process that can be scaled industrially while minimizing thermal stress and allowing recovery of auxiliary materials.
Innovation Solution
A process involving mixing cellulose or starch with hydrochloric acid to form an aqueous hydrolysate, followed by phase separation with an organic extraction solvent, concentrating the CMF fraction, and then converting CMF to 5-(alkoxymethyl)furfural at reduced temperatures, with subsequent recovery of alcohol and hydrochloric acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If CMF is isolated by evaporation of organic extraction solvent, then CMF can be obtained in pure form for further processing, but thermal degradation of CMF occurs due to thermal stress
Solution Approach 1:
The patent extracts CMF from the reaction mixture using an organic extraction solvent (dichloromethane or ethyl acetate) without requiring complete evaporation. The CMF remains in solution at controlled concentrations (3-10% w/w), avoiding the thermal stress of complete solvent removal while maintaining purity through selective extraction into the organic phase.
Solution Approach 2:
The patent changes the concentration parameter of CMF in the organic phase from complete isolation (100%) to controlled low concentrations (3-10% w/w). This parameter change allows the subsequent alcoholysis reaction to proceed without thermal degradation while still achieving high purity final products through controlled reaction conditions and selective solubility.
2Manufacturing precision
If CMF is processed in isolated form to MMF or EMF, then conversion can be achieved, but the process is not attractive for industrial scale due to complexity and thermal stress risks
Solution Approach 1:
The patent merges the extraction and reaction steps into a continuous process where CMF is extracted into organic solvent and immediately reacted with alcohol without isolation. This eliminates the need for separate evaporation and handling steps, reducing process complexity and thermal stress while maintaining conversion efficiency, making the process suitable for industrial scaling.
Solution Approach 2:
The patent implements continuous processing where CMF extraction and alcoholysis occur in sequence without interruption or isolation. The organic phase containing CMF is directly treated with alcohol under controlled conditions, maintaining continuous useful action while avoiding thermal degradation associated with batch evaporation and isolation steps.
3Productivity
If auxiliary materials like alcohols and hydrochloric acid are used in the process, then conversion can be achieved, but recovery of these materials is needed to improve process economics
Solution Approach 1:
The patent implements recovery of auxiliary materials through phase separation. After alcoholysis, the mixture is separated into aqueous and organic phases. The aqueous phase containing hydrochloric acid and excess alcohol is recovered and can be reused, while the organic phase contains the purified product. This recovery system reduces material loss and improves process economics while maintaining high conversion rates.
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
Reduces thermal degradation of CMF, enables industrial scalability, and facilitates the recovery of auxiliary materials like alcohols and hydrochloric acid, enhancing process economics.
Implementation Method 1
mixing at a temperature between 10 and 40°C said composition comprising cellulose and/or starch with an aqueous composition comprising hydrochloric acid at a concentration at least 36% to form an aqueous hydrolysate comprising sugars
Implementation Method 2
combining the aqueous hydrolysate with an organic extraction solvent and subject to mixing and heating to a temperature of between 60 and 95°C to obtain a mixture comprising organic extraction solvent, 5-(chloromethyl)furfural, and an aqueous liquid
Implementation Method 3
separating the mixture obtained by step b. in a non-aqueous fraction comprising organic extraction solvent and 5-(chloromethyl)furfural and an aqueous fraction comprising water and hydrochloric acid
Implementation Method 4
adding an alcohol to the concentrate in a weight ratio alcohol : 5-(chloromethyl)furfural of between 1: 1 and 1 : 10 at a temperature of between 5 and 50°C to obtain a mixture comprising 5-(alkoxymethyl)furfural and acetals thereof
Data Source
AI summary
A process for producing 5-(alkoxymethyl)furfural from a composition comprising cellulose and/or starch, or a source of cellulose or starch. The composition comprising cellulose or source thereof may be cotton, optionally mixed with man-made fibres such as polyester or polyamide fibres. The 5-(alkoxymethyl)furfural is preferably 5-(methoxymethyl)furfural or 5-(ethoxymethyl)furfural.