Dehydrochlorination Process for 1,1,3-Trichloropropene
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Solution Overview
Problem
Current processes for producing chlorinated alkenes, such as 1,1,3-trichloropropene, face challenges due to the formation of unwanted impurities, which affect catalyst performance and yield, and are not economically viable, especially when using alkaline hydroxides, leading to unacceptable impurity profiles and difficulties in downstream processes.
Innovation Solution
A process involving the dehydrochlorination of 1,1,1,3-tetrachloropropane to produce 1,1,3-trichloropropene, where the molar ratio of 1,1,3-trichloropropene to 1,1,1,3-tetrachloropropane is controlled between 5:95 to 30:70, and the reaction is conducted at 120°C to 170°C with a catalyst, ensuring high purity and minimizing the formation of problematic impurities and improving catalyst activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dehydrochlorination reaction is allowed to proceed to high conversion, then the yield of 1,1,3-trichloropropene increases, but the formation of unwanted impurities increases and catalyst performance deteriorates
Solution Approach 1:
The patent applies dynamic control of reaction conditions by continuously adjusting the residence time and conversion level in the dehydrochlorination reactor. The process maintains optimal conversion levels (controlling molar ratio between 5:95 to 30:70) rather than allowing complete conversion, thereby dynamically balancing product yield with impurity formation and catalyst preservation throughout the continuous operation.
Solution Approach 2:
The patent changes key reaction parameters including temperature (120°C to 170°C), pressure, and most importantly the molar ratio of 1,1,3-trichloropropene to 1,1,1,3-tetrachloropropane (controlled between 5:95 to 30:70). These parameter adjustments optimize the dehydrochlorination reaction to maximize yield while minimizing unwanted impurities and maintaining catalyst activity.
2Ease of manufacture
If traditional alkaline hydroxides are used in the dehydrochlorination process, then the reaction can proceed, but the impurity profile becomes unacceptable and downstream processing becomes difficult
Solution Approach 1:
The patent introduces a solid acid catalyst as an intermediary substance to facilitate the dehydrochlorination reaction instead of using traditional alkaline hydroxides. This catalyst mediator enables the reaction to proceed while producing a much cleaner impurity profile that is easier to manage in downstream processing, thereby resolving the contradiction between reaction feasibility and product purity.
Solution Approach 2:
The patent fundamentally changes the chemical nature of the reaction medium by replacing alkaline hydroxides with solid acid catalysts operating under controlled temperature (120°C to 170°C) and pressure conditions. This parameter change in the reaction system transforms the impurity profile from unacceptable to commercially viable, maintaining ease of manufacture while achieving high manufacturing precision.
3Productivity
If the reaction temperature is increased to improve reaction rate, then productivity increases, but the formation of side products and impurities increases
Solution Approach 1:
The patent optimizes the temperature parameter within a specific range (120°C to 170°C) to achieve the desired balance between reaction rate and selectivity. This controlled temperature parameter change ensures sufficient productivity through adequate reaction kinetics while preventing excessive thermal energy input that would lead to unwanted side reactions and impurity formation.
Solution Approach 2:
The solid acid catalyst acts as an intermediary that lowers the activation energy barrier, enabling the dehydrochlorination reaction to proceed at moderate temperatures (120°C to 170°C) with high reaction rates. This catalyst mediation eliminates the need for high temperatures that would otherwise be required to achieve acceptable productivity, thereby preventing thermal side reactions and impurity formation.
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 results in a highly selective and efficient production of 1,1,3-trichloropropene with reduced impurities, enhancing catalyst performance and yield, and allows for the production of high-purity chlorinated alkenes without the use of alkaline hydroxides, making the process economically viable and suitable for industrial-scale operations.
Implementation Method 1
contacting 1,1,1,3-tetrachloropropane, with a catalyst in a dehydrochlorination zone to produce a liquid reaction mixture comprising 1,1,1,3-tetrachloropropane and 1,1,3-trichloropropene
Implementation Method 2
extracting 1,1,3-trichloropropene from the reaction mixture
Data Source
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AI summary
Disclosed is a process for preparing a chlorinated alkene, comprising contacting a chlorinated alkane with a catalyst in a dehydrochlorination zone to produce a liquid reaction mixture comprising the chlorinated alkane and the chlorinated alkene, and extracting chlorinated alkene from the reaction mixture, wherein the concentration of the chlorinated alkene in the reaction mixture present in the dehydrochlorination zone is controlled such that the molar ratio of chlorinated alkene : chlorinated alkane is from 1 :99 to 50:50.