Methane Bromination for Olefin Production and Catalyst Stability
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Solution Overview
Problem
Current gas-to-olefins processes suffer from catalytic deactivation due to coke formation, leading to instability and inefficiency in converting methane into valuable olefins like ethylene and propylene.
Innovation Solution
A process involving bromination of methane with a bromine-rich stream to produce methyl bromide and hydrogen bromide, followed by separation and electrolysis to recover hydrogen and bromine, which minimizes coke formation and allows for the conversion of methane into olefins with improved catalyst stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional gas-to-olefins processes are used, then methane can be converted into olefins, but catalyst deactivation occurs due to coke formation
Solution Approach 1:
The patent extracts and removes coke deposits from the catalyst surface using oxidative treatment. The catalyst is periodically exposed to oxygen-containing gas streams that selectively burn off accumulated coke while preserving the active catalytic sites, thereby extending catalyst life and maintaining stability without reducing olefin production capacity
Solution Approach 2:
The patent implements periodic catalyst regeneration cycles where the catalyst alternates between reduction mode (for olefin production) and oxidation mode (for coke removal). This periodic switching between reactive states allows the catalyst to maintain high activity over extended periods by systematically eliminating deactivating coke deposits before they cause permanent damage
2Loss of substance
If oxidative processes are used for natural gas conversion, then carbon efficiency can be improved, but carbon dioxide and water are formed as unwanted by-products
Solution Approach 1:
The patent applies localized oxidative conditions specifically targeted at coke deposits on the catalyst surface rather than bulk oxidation of the hydrocarbon feed. By confining oxygen exposure to the catalyst exterior where coke accumulates, the process achieves high carbon efficiency through selective coke combustion while preventing excessive oxidation that would generate unwanted CO2 and water in the product stream
Solution Approach 2:
The catalyst surface acts as an intermediary that mediates between the hydrocarbon feed and oxygen. It facilitates controlled oxidation reactions that convert deposited coke into removable carbon dioxide while protecting the main reaction pathway from excessive oxidation, thereby improving carbon efficiency without generating excessive unwanted by-products in the olefin product
3Reliability
If bromination process is used, then coke formation is minimized and catalyst stability is improved, but additional separation and electrolysis steps are required
Solution Approach 1:
The patent uses bromine compounds as temporary substitutes for oxygen during the activation phase. Bromine radicals effectively initiate hydrocarbon activation and promote olefin formation without causing the severe coke deposition problems associated with oxygen. The bromine is then removed and converted back to useful products through separation and electrolysis, creating a cleaner reaction pathway that protects catalyst stability
Solution Approach 2:
The patent discards bromine compounds from the reaction stream after they have served their activation function, then recovers them through separation and electrolysis. This allows the bromine to be reused in subsequent cycles, making the additional separation steps worthwhile by achieving superior catalyst stability and reduced coke formation compared to conventional oxidative 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 effectively reduces coke contamination, enhancing the conversion of methane into ethylene and propylene while recovering valuable hydrogen and bromine, thereby improving catalyst stability and process efficiency.
Implementation Method 1
A process involving bromination of methane with a bromine-rich stream to produce methyl bromide and hydrogen bromide
Implementation Method 2
followed by separation and electrolysis to recover hydrogen and bromine
Implementation Method 3
converting methane into valuable olefins like ethylene and propylene
Data Source
AI summary
The present disclosure relates in its first aspect to a process of converting a stream comprising methane into chemicals, said process being remarkable in that it comprises the steps of providing a first stream (1, 5, 11) comprising methane, providing a second stream (79) which is a bromine-rich stream, putting into contact said first stream (15) with said second stream (79) to obtain a third stream (21) comprising at least unreacted methane, methyl bromide, dibromomethane, and hydrogen bromide and removing said dibromomethane from said third stream (21), to produce a dibromomethane stream (103) and a fourth stream (27) comprising unreacted methane, methyl bromide and hydrogen bromide; wherein the fourth stream (27) is converted into chemicals. In its second aspect, the present disclosure concerns an installation for carrying out the process of the first aspect.