Reactive Scrubbing for Formaldehyde Removal in Methanol Synthesis
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Solution Overview
Problem
Current methods for removing formaldehyde from partially oxidized hydrocarbons during the partial oxidation of methane to methanol are inefficient, leading to capital intensity and wastage of oxygen and methane, with formaldehyde being carcinogenic and difficult to handle.
Innovation Solution
A method and apparatus using reactive scrubbing mediums, such as urea, to react with formaldehyde and convert it into a less toxic, higher-value product like urea-formaldehyde, without altering the co-produced methanol and ethanol, by contacting the formaldehyde-containing gas blend with a reactive scrubbing liquid in a reactor system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If formaldehyde is removed by traditional distillation methods, then separation is achieved, but capital intensity increases and process complexity increases
Solution Approach 1:
The patent extracts formaldehyde from the product mixture by selective reaction with urea in the scrubbing liquid, separating it from methanol and ethanol before distillation. This removes the problematic component early in the process, simplifying subsequent separation operations and reducing capital requirements for complex distillation systems.
Solution Approach 2:
The patent introduces urea as an intermediary substance that reacts with formaldehyde to form a stable adduct. This intermediary reaction enables selective formaldehyde removal without affecting methanol or ethanol, simplifying the overall separation process and reducing equipment complexity.
2Ease of operation
If formaldehyde is transported as aqueous solution, then handling is simplified, but toxicity issues persist and product value is reduced
Solution Approach 1:
The patent converts the harmful formaldehyde into a beneficial product by reacting it with urea to form urea-formaldehyde resin, a valuable commercial product. This transformation eliminates toxicity concerns while creating additional revenue streams, turning a waste disposal problem into a value-added opportunity.
3Device complexity
If formaldehyde is reacted with chemicals for separation, then separation is simplified, but additional processing steps are required
Solution Approach 1:
The patent combines the formaldehyde removal reaction with the product separation process in a single integrated scrubbing column. The urea-formaldehyde reaction occurs simultaneously with mass transfer, eliminating the need for separate reaction and separation units and maintaining high processing throughput.
Solution Approach 2:
The patent performs formaldehyde removal early in the processing sequence, before main distillation operations. This preliminary action prevents formaldehyde from interfering with subsequent separation steps, simplifying the overall process flow and maintaining productivity.
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
Effectively removes formaldehyde from partially oxidized hydrocarbons, converting it into a less toxic form while maximizing ethanol recovery and simplifying separation processes, reducing toxicity and operational costs.
Implementation Method 1
reacting a hydrocarbon-containing gas with an oxygen-containing gas in a reaction vessel to form the first product blend. The first product blend includes a blend of partially oxygenated compounds that include formaldehyde
Implementation Method 2
The blend of partially oxygenated compounds is provided to a reactive scrubbing station where it is contacted with a reactive scrubbing liquid to form a reactive liquid-formaldehyde compound
Data Source
AI summary
An apparatus for removing formaldehyde from a blend of partially oxygenated hydrocarbons includes a reactor for reacting a hydrocarbon-containing gas with an oxygen-containing gas in a reactor vessel to form first product blend. The first product blend includes a blend of partially oxygenated compounds that include formaldehyde. The apparatus also includes a reactive scrubbing station in fluid communication with the reactor where the blend of partially oxygenated compounds that include formaldehyde is contacted with a reactive scrubbing liquid at the reactive scrubbing station to form a reactive liquid-formaldehyde compound.