Continuous Haloalkenone Ether Synthesis via Staged CSTRs
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Solution Overview
Problem
Existing semi-batch processes for producing haloalkenone ethers require large reactors, additional purification steps, and excessive use of solvents and alkyl vinyl ether, which is undesirable due to polymerization risks and inefficiencies in scaling up for commercial production.
Innovation Solution
A continuous process involving two continuous stirred tank reactors and optionally a plug-flow reactor, operating without a base or stabilizers, with controlled reaction conditions to minimize by-products and reduce reactor size, using a halide and vinyl ether with a molar ratio of 0.8:1 to 1:0.8, and employing the intermediate compound as a solvent to enhance reaction rates and yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If semi-batch processes are used for producing haloalkenone ethers, then the process can be conducted with existing equipment, but large reactor volumes are required and additional purification steps are needed
Solution Approach 1:
The patent applies continuous processing instead of semi-batch operation, where reactants are continuously fed through a series of stirred tank reactors. This continuous action allows for smaller overall reactor volume while maintaining production capacity, as the process operates steadily without the start-stop nature of batch operations that require excess volume for safety and flexibility.
Solution Approach 2:
The continuous process is divided into multiple staged reactors (typically 3-5 CSTRs in series) rather than using a single large reactor. This segmentation allows each reactor to be optimized for specific conversion levels, enabling the use of smaller individual reactor volumes that sum to a smaller total volume compared to semi-batch requirements.
2Reliability
If semi-batch processes are used with base and stabilizer, then reaction control is improved, but additional purification steps and waste treatment are required
Solution Approach 1:
The patent changes the chemical parameters by eliminating base and stabilizer from the reaction system. Instead, it uses controlled continuous flow through multiple reactors at optimized temperatures and residence times to achieve stable reaction control. This parameter change removes the need for additional purification steps to remove base catalysts and stabilizer byproducts.
Solution Approach 2:
The patent extracts or removes the base catalyst and stabilizer components from the reaction system entirely. By using a base-free continuous process with controlled residence time and temperature in series reactors, the method eliminates these additives and their associated purification requirements, simplifying the overall process.
3Productivity
If excess alkyl vinyl ether is used in semi-batch process, then complete conversion of halide is achieved, but polymerization of alkyl vinyl ether occurs and large quantities are required
Solution Approach 1:
The patent uses dynamic continuous flow control where the residence time in each reactor stage is precisely controlled. This dynamic control allows the vinyl ether to react completely with the halide without excessive accumulation that would cause polymerization. The continuous removal of product and controlled throughput prevent the harmful effects of excess vinyl ether while maintaining high conversion.
Solution Approach 2:
The continuous process performs preliminary reaction in the first reactor stages where vinyl ether and halide are introduced, allowing controlled conversion before the mixture proceeds to subsequent reactors. This staged preliminary action ensures complete halide conversion while limiting vinyl ether exposure time, preventing polymerization that would occur in semi-batch with excess vinyl ether present throughout.
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 continuous process allows for higher reaction temperatures, reduced reactor volumes, minimized by-product formation, and improved yields of up to 95%, avoiding the need for additional solvents and purification steps, thus enhancing cost-effectiveness and scalability.
Implementation Method 1
The halide of Formula (II) and the vinyl ether of Formula (III) are fed into the first continuous stirred tank reactor
Implementation Method 2
the conditions within the subsequent reactor permit the elimination of hydrogen halide (HR3) to give the haloalkenone ether of Formula (I)
Data Source
AI summary
The present invention relates to a continuous process for producing a haloalkenone ether of the Formula (I) wherein R1 is C1 - C6 haloalkyl, R2 is a C1-C6 alkyl or phenyl, the process comprising:- (i) reacting, in a first continuous stirred tank reactor comprising a solvent, a halide of Formula (II) wherein R1 is as previously defined and R3 is halogen, with a vinyl ether of Formula (III) wherein R2 is as previously defined, to form an intermediate compound of Formula (IV), wherein the concentration of the vinyl ether of Formula (III) in the reaction mass is 15% or less w/w; and (ii) transferring the reaction mass from the first continuous stirred tank reactor into a subsequent continuous stirred tank reactor, wherein the conditions within the subsequent reactor permit the elimination of hydrogen halide (HR3) from the intermediate compound of Formula (IV) to provide the haloalkenone ether of Formula (I).