Carbonyl Flow Synthesis with Immobilized Catalyst Phosgene Generation
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Solution Overview
Problem
Existing methods for producing carbonyl compounds using triphosgene in a flow reactor suffer from insufficient conversion efficiency, leading to impurities and limited purity of the target compound.
Innovation Solution
A method involving a flow type reaction system where a solid catalyst is immobilized in a flow channel to convert triphosgene into phosgene, combined with a tertiary amine to neutralize hydrochloric acid, ensuring high purity and continuous production of carbonyl compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If triphosgene is used as a reactant in a flow reactor with a tertiary amine catalyst, then the safety is improved compared to using phosgene directly, but the conversion efficiency of triphosgene to phosgene is insufficient leading to impurities
Solution Approach 1:
The patent introduces a solid catalyst as an intermediary substance that facilitates the conversion of triphosgene to phosgene. The solid catalyst acts as a mediator between triphosgene and the reaction substrate, enabling efficient phosgene generation while maintaining safety by avoiding direct handling of gaseous phosgene. The catalyst is introduced into the flow reactor along with the triphosgene solution, and it catalyzes the decomposition reaction to generate phosgene in situ with high conversion efficiency.
Solution Approach 2:
The patent optimizes reaction parameters including temperature, flow rates, and catalyst concentration to achieve high conversion efficiency. By controlling the temperature within a specific range and adjusting the flow rates of triphosgene solution and catalyst solution, the system maximizes the conversion of triphosgene to phosgene while maintaining safe operating conditions. The parameters are carefully tuned to balance safety and productivity.
2Productivity
If a flow reactor is used to continuously react phosgene with alcohol compound, then the continuous production capability is improved, but the purity of target carbonyl compound is limited due to insufficient conversion efficiency
Solution Approach 1:
The solid catalyst serves as an intermediary that enables efficient phosgene generation within the continuous flow system. By introducing the catalyst into the flow reactor, the system achieves both continuous operation and high conversion efficiency, producing pure carbonyl compounds without the impurities that plagued previous continuous flow methods.
Solution Approach 2:
The patent replaces the need for complex purification mechanical systems by achieving high purity through efficient catalytic conversion. The solid catalyst enables the reaction to proceed with such high efficiency that minimal purification is required, simplifying the overall continuous production system while maintaining high product purity.
3Ease of manufacture
If triphosgene is converted to phosgene using a tertiary amine catalyst in solution, then the reaction can proceed, but the tertiary amine also neutralizes hydrochloric acid reducing overall efficiency
Solution Approach 1:
The patent segments the catalytic function from the neutralization function by using a solid catalyst for phosgene generation while the tertiary amine in the reaction substrate performs neutralization. This segmentation allows both functions to occur simultaneously without interfering with each other, maintaining reaction feasibility while improving overall efficiency.
Solution Approach 2:
The reaction substrate itself serves the dual purpose of being both the reactant and the neutralizing agent. The tertiary amine groups in the reaction substrate neutralize the hydrochloric acid generated during the reaction, eliminating the need for a separate neutralization step and improving overall process efficiency while maintaining ease of manufacture.
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 method achieves safe, continuous, and high-purity production of carbonyl compounds by enhancing triphosgene conversion efficiency and minimizing impurities.
Implementation Method 1
a solid catalyst that converts triphosgene into phosgene is immobilized in at least a part of the first flow channel
Implementation Method 2
a tertiary amine to neutralize hydrochloric acid
Data Source
Figure 1~3
Figure 4~5
AI summary
There are provided a method of producing a carbonyl compound by a flow type reaction, including introducing a triphosgene solution into a flow channel (I), bringing the triphosgene solution into contact with a solid catalyst immobilized in at least a part of the flow channel (I) to generate a phosgene solution while the triphosgene solution is flowing through the flow channel (I), joining the phosgene solution and an active hydrogen-containing compound solution that flows inside the flow channel (II), which are subsequently allowed to flow downstream inside a reaction flow channel to be reacted in a presence of a tertiary amine, and obtaining a carbonyl compound in a joining solution; and a flow type reaction system that is suitable for carrying out this production method.