Formaldehyde Catalyst Composition for Lower CO at Higher Pressure
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Solution Overview
Problem
Existing processes for producing formaldehyde from methanol suffer from high carbon monoxide (CO) and methyl formate losses, leading to reduced yield and profitability, especially when operating at higher pressures.
Innovation Solution
Incorporating copper into the catalyst composition, comprising oxides of iron and molybdenum, reduces CO and methyl formate losses by maintaining or even decreasing their molar ratios in the formaldehyde reactor outlet stream, allowing for increased reactor inlet pressure without adverse effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the reactor inlet pressure is increased to increase production, then productivity is improved, but the selectivity of the catalyst deteriorates resulting in increased formation of unwanted by-products
Solution Approach 1:
The invention changes the chemical composition parameter of the catalyst by adding copper oxide (0.001-5 wt%) to the iron-molybdenum oxide system. This compositional modification enables the catalyst to maintain high selectivity even at elevated reactor inlet pressures (up to 10 bar or higher), thereby resolving the contradiction between improved productivity through pressure increase and maintained selectivity.
2Productivity
If the reactor inlet pressure is increased, then productivity is improved, but the CO loss increases
Solution Approach 1:
By modifying the catalyst composition to include copper oxide in the iron-molybdenum oxide system, the invention changes the catalytic properties to reduce CO formation. This enables operation at higher pressures with reduced CO loss (defined as molar ratio of CO to formaldehyde in reactor effluent), thus improving productivity while minimizing substance loss.
3Productivity
If the reactor inlet pressure is increased, then productivity is improved, but the methyl formate formation increases
Solution Approach 1:
The addition of copper oxide to the iron-molybdenum oxide catalyst system modifies the catalytic activity and selectivity. This compositional change suppresses the formation of methyl formate by-product even when operating at elevated reactor inlet pressures, thereby enabling increased productivity without proportional increase in substance loss.
4Productivity
If the reactor inlet pressure is increased, then productivity is improved, but the profitability deteriorates due to increased by-product formation
Solution Approach 1:
By modifying the catalyst composition to include copper oxide, the invention improves the economic efficiency of high-pressure operation. The modified catalyst reduces formation of unwanted by-products (CO, methyl formate, dimethyl ether) that would otherwise require additional processing and reduce formaldehyde yield, thereby maintaining profitability even at higher reactor inlet pressures where productivity is enhanced.
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
The catalyst with copper addition achieves lower CO and methyl formate losses, enabling higher reactor inlet pressures and improved formaldehyde yield, thereby enhancing process efficiency and profitability.
Implementation Method 1
reacting the methanol in the gas phase with the oxygen-containing gas in the reactor in the presence of a catalyst comprising oxides of iron and molybdenum
Implementation Method 2
the oxidation of methanol to produce formaldehyde: CH3OH+0.5 O2→CH2O+H2O
Implementation Method 3
the catalyst comprises copper (Cu) in an amount of at least 0.025 wt % of the catalyst, or at least 0.05 wt % of the catalyst
Implementation Method 4
believed to be formed from an increase in the concentration of methoxy groups adsorbed onto the catalyst surface: 2CH3OH→CH3OCH3+H2O
Data Source
AI summary
A process for the production of formaldehyde from methanol comprising the steps of: feeding to a reactor a feed stream comprising the methanol and an oxygen-containing gas; reacting the methanol in the gas phase with the oxygen-containing gas in the reactor in the presence of a catalyst comprising oxides of iron and molybdenum; and recovering a formaldehyde reactor outlet stream from the reactor, the formaldehyde reactor outlet stream comprising formaldehyde and carbon monoxide. The catalyst comprises copper in an amount of at least 0.025 wt %, or at least 0.05 wt %, of the catalyst and in that the molar ratio of carbon monoxide to formaldehyde in the formaldehyde reactor outlet stream is at least 5% less than the molar ratio of carbon monoxide to formaldehyde in the formaldehyde reactor outlet stream in the same process using a catalyst containing essentially no copper.