Reactive Distillation for Formaldehyde Removal from Glycolaldehyde
Solution Overview
Problem
The presence of formaldehyde in pyrolysis product compositions hinders subsequent chemical transformations due to catalyst poisoning and requires time-consuming separation procedures, leading to reduced yields and industrial inefficiencies.
Innovation Solution
Subjecting low molecular weight carbonyl compounds to specific catalyzed reactive distillation conditions in the presence of an alcohol, where formaldehyde is selectively acetalized and removed, resulting in a composition with greater than 80% recovery of glycolaldehyde and reduced formaldehyde content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If formaldehyde is present in pyrolysis product compositions, then the composition contains complete reaction products, but subsequent chemical transformations are hindered due to catalyst poisoning
Solution Approach 1:
The patent applies preliminary action by removing formaldehyde from the pyrolysis product composition before performing subsequent chemical transformations. The process uses reactive distillation with alcohol and catalyst to acetalize and remove formaldehyde in advance, preventing catalyst poisoning in later hydrogenation or other transformation steps.
Solution Approach 2:
The patent extracts the harmful formaldehyde component from the pyrolysis product composition through reactive distillation. By selectively reacting formaldehyde with alcohol in the presence of a catalyst and removing the formed acetal through distillation, the process separates and removes the substance causing catalyst poisoning.
2Quantity of substance
If conventional separation procedures are used to remove formaldehyde, then formaldehyde content is reduced, but the process becomes time-consuming and yields decrease
Solution Approach 1:
The patent merges the separation of formaldehyde with a chemical transformation reaction. Instead of using conventional physical separation methods, the process combines reactive distillation where formaldehyde is simultaneously reacted with alcohol to form acetals and removed, achieving both removal and productivity improvement in one integrated operation.
Solution Approach 2:
The patent changes the chemical state of formaldehyde by converting it from its reactive aldehyde form to stable acetal form through reaction with alcohol. This parameter change in chemical state enables selective removal through distillation while preventing catalyst poisoning, improving both formaldehyde removal efficiency and overall process productivity.
3Quantity of substance
If reactive distillation is used to remove formaldehyde, then high-yielding removal is achieved, but glycolaldehyde stability must be maintained under reaction conditions
Solution Approach 1:
The patent applies local quality by creating selective reaction conditions that favor formaldehyde acetalization while preserving glycolaldehyde. By controlling the local chemical environment with specific catalysts and alcohol concentrations, the process achieves high formaldehyde removal efficiency while maintaining glycolaldehyde stability and achieving greater than 80% recovery.
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 process enables high-yielding removal of formaldehyde, allowing for subsequent chemical transformations like hydrogenation, and produces a composition suitable for industrial use with less than 0.05% formaldehyde by weight, overcoming previous catalyst poisoning issues and enabling new reaction conditions.
Implementation Method 1
reactive distillation in the presence of at least one alcohol and a catalyst, wherein the formaldehyde will be selectively acetalised
Implementation Method 2
formaldehyde is transformed into one or more formaldehyde acetal(s) and removed from the reactive distillation reaction solution by reactive distillation
Data Source
AI summary
A process for reducing the percentage by weight of formaldehyde present in a composition comprising glycolaldehyde, wherein formaldehyde is transformed into one or more formaldehyde acetal(s) and removed from the reactive distillation reaction solution by reactive distillation in the presence of at least one alcohol and a catalyst.