Methane-to-Methanol Co-Production With Sulfuric Acid Recirculation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for converting methane into methanol are energy-intensive and inefficient, with high raw-material costs and low reaction yields, and existing systems do not effectively produce methanol and sulfuric acid in equal equivalents.
Innovation Solution
A system comprising an oxidation reaction unit, reactive distillation unit, and hydrolysis reaction unit, utilizing a platinum-based catalyst and fuming sulfuric acid to produce methyl bisulfate, followed by esterification and hydrolysis to obtain methanol and sulfuric acid in equal equivalents, with heat recovery and recirculation of unreacted materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If methane is converted into syngas via reforming process and then into methanol, then methanol can be produced, but the process requires high temperature (800°C or higher) and consumes very energy
Solution Approach 1:
The patent changes the reaction parameters by using fuming sulfuric acid as both oxidizing agent and solvent, enabling the reaction to proceed at low temperature (180-220°C) instead of the conventional high temperature (800°C or higher) required for steam reforming, thus dramatically reducing energy consumption while maintaining methanol production efficiency
Solution Approach 2:
The patent extracts the high-energy reforming step from the conventional two-step process and replaces it with a direct oxidation reaction using fuming sulfuric acid, eliminating the need for high-temperature syngas generation while still achieving methanol synthesis
2Device complexity
If methane is directly oxidized using oxygen (O2), then the process is simpler, but methanol is decomposed at a faster rate
Solution Approach 1:
The patent introduces fuming sulfuric acid as an intermediary substance that acts as both oxidizing agent and solvent, mediating the oxidation of methane to methanol while providing a protective environment that prevents methanol decomposition, thus maintaining both process simplicity and product stability
3Extent of automation
If oxidizing agents such as H2O2 or K2S2O8 are used to oxidize methane, then direct oxidation can be achieved, but raw-material prices are high and reaction yield is low (30% or less)
Solution Approach 1:
The patent replaces expensive oxidizing agents (H2O2, K2S2O8) with fuming sulfuric acid, which is more cost-effective and provides superior performance. The system also implements recirculation of unreacted materials and byproducts, effectively creating a sustainable process that improves both economics and productivity
4Temperature
If fuming sulfuric acid is used to synthesize methyl bisulfate, then the process can be performed at low temperature (180°C to 220°C) with high yield (80% or more), but sulfuric acid consumption increases
Solution Approach 1:
The patent implements a recirculation system where unreacted fuming sulfuric acid and byproducts from the methyl bisulfate synthesis are recovered and reused in subsequent reactions. This approach maintains the advantages of low temperature operation and high yield while significantly reducing overall sulfuric acid consumption through resource 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
The system achieves high-yield, low-temperature production of methanol and sulfuric acid, enhancing economic feasibility and scalability by minimizing energy consumption and raw-material use.
Implementation Method 1
an oxidation reaction unit configured to produce methyl bisulfate (CH3OSO3H) by reacting methane gas with an acid solution in the presence of a catalyst
Implementation Method 2
separate the product into methyl trifluoroacetate (CF3COOCH3) and sulfuric acid (H2SO4) through thermal distillation
Implementation Method 3
a hydrolysis reaction unit disposed downstream of the reactive distillation unit and configured to produce methanol by hydrolyzing methyl trifluoroacetate (CF3COOCH3) supplied from the reactive distillation unit
Data Source
AI summary
Disclosed is a methanol and sulfuric acid co-production system capable of producing methanol and sulfuric acid in equal equivalents. Specifically, the system includes an oxidation reaction unit configured to produce methyl bisulfate (CH3OSO3H) by reacting methane gas with an acid solution in the presence of a catalyst, a reactive distillation unit disposed downstream of the oxidation reaction unit and configured to esterify methyl bisulfate (CH3OSO3H) supplied from the oxidation reaction unit with trifluoroacetic acid (CF3COOH) to obtain a product and to separate the product into methyl trifluoroacetate (CF3COOCH3) and sulfuric acid (H2SO4) through thermal distillation, and a hydrolysis reaction unit disposed downstream of the reactive distillation unit and configured to produce methanol by hydrolyzing methyl trifluoroacetate (CF3COOCH3) supplied from the reactive distillation unit, in which the reactive distillation unit recirculates the sulfuric acid resulting from separation to the oxidation reaction unit.