Multi-Stage Oxidation Process with Inter-Stage Condensation
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Solution Overview
Problem
Multi-stage vapor phase oxidation processes employing staged oxygen arrangements for converting lower alkanes and alkenes to unsaturated carboxylic acids and nitriles often result in decreased total yield due to inefficiencies in hydrocarbon utilization and product recovery.
Innovation Solution
A process involving a multi-stage reaction system with inter-stage partial condensation to separate oxidation products, allowing for the recycling of unreacted hydrocarbons and additional oxygen feeding to subsequent reaction zones, thereby enhancing cumulative oxidation product yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If staged oxygen arrangement is used to avoid autoignition, then safety is improved, but total yield decreases due to unreacted hydrocarbon loss
Solution Approach 1:
The patent recycles unreacted hydrocarbons from intermediate effluent streams back to subsequent reaction zones, converting what would be waste into additional product. This resolves the contradiction by recovering the hydrocarbon loss inherent in staged oxygen arrangements while maintaining safety benefits.
Solution Approach 2:
The system implements feedback by monitoring and recycling unreacted hydrocarbons through inter-stage condensation and reuse. This closed-loop approach ensures that hydrocarbons not converted in one stage are recovered and fed to the next stage, maintaining high total yield while preserving the safety advantages of staged oxygen addition.
2Productivity
If inter-stage partial condensation is implemented, then product recovery is improved, but process complexity increases
Solution Approach 1:
The patent divides the oxidation process into multiple stages with inter-stage condensation, separating product recovery from the main reaction flow. This segmentation allows efficient product recovery at each stage while managing complexity through modular design, where each stage is an independent unit.
Solution Approach 2:
The system utilizes phase transitions through inter-stage condensation, where oxidation products condense from vapor to liquid phase between reaction zones. This natural phase change enables product separation and recovery without requiring complex mechanical separation equipment, thus improving product recovery while limiting complexity increase.
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 approach leads to increased overall cumulative oxidation product yields compared to single-stage and staged oxygen arrangement systems, optimizing hydrocarbon utilization and product recovery.
Implementation Method 1
catalytically reacting the lower alkane in a gaseous phase, in the presence of a suitable mixed metal oxide catalyst
Implementation Method 2
vapor phase oxidation reaction of their corresponding C3 to C5 alkanes, C3 to C5 alkenes, and mixtures thereof
Implementation Method 3
inter-stage partial condensation to separate oxidation products
Data Source
AI summary
An improved process for the production of unsaturated carboxylic acids and unsaturated nitrites from their corresponding C3 to C5 alkanes, or mixtures of C3 to C5 alkanes and alkenes, that involves a multi-stage reaction system which employs both separation of the oxidation product from one or more intermediate effluent streams, as well as feeding additional oxygen to reaction zones subsequent to the first reaction zone.