Synthesis Gas Hydrogen Enrichment via Inert Extraction
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Solution Overview
Problem
Existing processes for improving the hydrogen-to-carbon monoxide ratio in synthesis gas, particularly in methanol production, require large reforming reactors and suffer from high inert buildup and increased costs.
Innovation Solution
A process that involves removing hydrogen and hydrocarbons from the purge stream of a synthesis loop, reforming them with steam and oxygen, and subjecting the product to a shift reaction to enhance hydrogen content, allowing for recycling back into the loop while removing inerts with carbon dioxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If reforming reaction is applied to improve hydrogen-to-carbon monoxide ratio, then hydrogen content increases, but equipment size and capital costs increase due to large reforming reactors required
Solution Approach 1:
The invention extracts and removes inerts (nitrogen, carbon dioxide) from the synthesis gas stream before the reforming reaction. By removing inerts upfront, the subsequent reforming reaction can be performed in a much smaller reactor volume while still achieving the desired hydrogen content increase, because the reactor only needs to handle the reactive components (hydrocarbon, steam, oxygen) without processing large volumes of inert gas.
Solution Approach 2:
The invention performs preliminary inert removal before the reforming reaction. This preliminary action of separating inerts from the synthesis gas allows the reforming reactor to be compact, as it only needs to process the concentrated reactive portion of the gas stream rather than the full volume containing大量 inerts.
2Quantity of substance
If reforming reaction is applied to improve hydrogen-to-carbon monoxide ratio, then hydrogen content increases, but operating costs increase
Solution Approach 1:
By extracting inerts before reforming, the process reduces the energy required for heating and processing the gas stream. The reforming reactor only needs to heat the reactive components (hydrocarbon, steam, oxygen) rather than heating large volumes of inert gas, significantly reducing operating costs.
Solution Approach 2:
The invention changes the composition parameters of the gas stream by removing inerts before reforming. This parameter change concentrates the reactive components, allowing the reforming reaction to proceed more efficiently with lower energy input and reduced operating costs.
3Quantity of substance
If reforming reaction is applied to improve hydrogen-to-carbon monoxide ratio, then hydrogen content increases, but inert buildup occurs in the system
Solution Approach 1:
The invention continuously extracts and removes inerts from the synthesis gas stream before the reforming reaction. This prevents inert accumulation in the system by actively separating nitrogen and carbon dioxide from the reactive gas components, allowing the reforming process to proceed without inert buildup problems.
Solution Approach 2:
The invention implements a feedback mechanism where inerts are continuously monitored and removed from the synthesis gas stream. The separated inerts are diverted from the main process loop, creating a feedback control system that maintains optimal gas composition and prevents inert accumulation that would otherwise occur in conventional reforming processes.
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 increases the hydrogen content in the synthesis gas, enhancing methanol production efficiency and reducing equipment size and inert buildup, while effectively handling high inert contents.
Implementation Method 1
passing the purge stream to a reformer and reacting with steam and oxygen to produce a stream comprising hydrogen and carbon monoxide
Implementation Method 2
subjecting the reformed reaction product stream to a shift reaction to produce a stream comprising carbon dioxide and hydrogen
Data Source
AI summary
A process for improving the hydrogen content of a synthesis gas stream to a synthesis loop, comprising the steps of: (a) removing a purge stream comprising hydrogen and hydrocarbons from a synthesis loop; (b) separating hydrogen from the purge stream; (c) passing the purge stream to a reformer and reacting with steam and oxygen to produce a stream comprising hydrogen and carbon monoxide; (d) subjecting the reformed reaction product stream to a shift reaction to produce a stream comprising carbon dioxide and hydrogen; (e) subjecting the product stream from the shift reaction to separation to separate hydrogen from carbon dioxide; (f) supplying the separated hydrogen to the synthesis loop; and (g) removing the carbon dioxide.