Alkylene Carbonate Production Using Carbon Sorbent
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Solution Overview
Problem
In continuous alkylene carbonate production processes using phosphonium catalysts, the back-reaction of alkylene carbonate into alkylene oxide and carbon dioxide is not adequately prevented, leading to reduced recovery efficiency and catalyst deactivation due to contaminant buildup.
Innovation Solution
Incorporating a sorption agent comprising carbon, such as activated carbon, into the process to treat alkylene carbonate and/or the catalyst, which absorbs contaminants and prevents the back-reaction, thereby maximizing alkylene carbonate recovery and extending catalyst life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the catalyst is reused without purification, then the process complexity is reduced, but the catalyst activity decreases due to contaminant buildup
Solution Approach 1:
The patent applies preliminary action by performing a bleed operation that removes contaminants from the recycle stream before the catalyst is reused. This preventive measure eliminates contaminant buildup that would otherwise deactivate the catalyst, allowing continuous operation without frequent catalyst replacement while maintaining catalyst activity.
2Manufacturing precision
If distillation is used to separate alkylene carbonate from catalyst, then product purity is improved, but energy consumption increases
Solution Approach 1:
The patent applies the extraction principle by using a bleed stream to selectively remove contaminants from the catalyst recycle stream. This targeted removal approach separates impurities without requiring complete distillation of the entire product stream, thereby reducing energy consumption while still achieving the necessary product purity and catalyst regeneration.
3Device complexity
If the back-reaction is not prevented, then the process is simpler, but the recovery of alkylene carbonate decreases
Solution Approach 1:
The patent applies feedback by continuously monitoring and controlling the catalyst condition through the bleed operation. By periodically removing contaminants that catalyze the back-reaction, the system maintains optimal catalyst activity and prevents the reverse reaction, thereby maximizing alkylene carbonate recovery without adding complex prevention mechanisms.
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 use of carbon-based sorption agents effectively prevents the back-reaction of alkylene carbonate into alkylene oxide and carbon dioxide, enhancing the recovery of alkylene carbonate and maintaining catalyst activity, thus eliminating the need for a bleed stream to remove contaminating species.
Implementation Method 1
a treatment of alkylene carbonate and/or catalyst with a sorption agent comprising carbon is carried out
Implementation Method 2
the sorption agent comprising carbon gave the best results in terms of preventing the back-reaction
Data Source
AI summary
The invention relates to a process for the production of an alkylene carbonate by the reaction of an alkylene oxide with carbon dioxide in the presence of a phosphonium catalyst in which process (a) the alkylene oxide, carbon dioxide and phosphonium catalyst are continuously introduced into a reaction zone from which a product stream containing alkylene carbonate and phosphonium catalyst is withdrawn; (b) alkylene carbonate and a stream containing phosphoniura catalyst are separated from the product stream; (c) the alkylene carbonate, separated in step (b), is recovered as product; and (d) the stream containing phosphoniura catalyst, separated in step (b), is recycled to the reaction zone, in which process a treatment of alkylene carbonate and/or catalyst with a sorption agent comprising carbon is carried out.