Ethionic Acid Production in Falling Film Reactor
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Solution Overview
Problem
Existing methods for producing ethionic acid using sulfur trioxide are economically disadvantageous due to the need for toxic sulfur dioxide as a reaction medium, high costs associated with using pure sulfur trioxide, and inefficiencies in heat management and scalability, particularly in industrial-scale implementations.
Innovation Solution
A process involving the reaction of ethanol and sulfur trioxide in a falling film reactor with a molar ratio of 1:2, where the reactor is cooled, using ethionic acid as the reaction medium and sulfur trioxide diluted with inert gases, allowing for controlled exothermic reactions and scalable production without additional solvents, utilizing contact gas to reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If liquid sulfur dioxide is used as reaction solvent, then quantitative yield of ethionic acid is obtained, but toxic sulfur dioxide must be recovered and recompressed which represents major operational expense
Solution Approach 1:
The patent extracts and eliminates the toxic sulfur dioxide solvent from the process by using ethionic acid itself as the reaction medium. This removes the need for sulfur dioxide recovery and compression operations, eliminating the major operational expense while maintaining quantitative yield through the self-solvating property of ethionic acid.
Solution Approach 2:
The patent applies self-service by using the product itself (ethionic acid) as the reaction medium. This self-solvating approach eliminates the need for separate solvent recovery systems and reduces operational expenses while maintaining high yield, as the product serves dual purposes: as both reactant and solvent.
2Manufacturing precision
If pure sulfur trioxide is used, then quantitative yield is achieved, but it is much more costly than contact gas
Solution Approach 1:
The patent changes the parameter of sulfur trioxide concentration by using diluted contact gas (containing inert gases) instead of pure sulfur trioxide. The ethionic acid solvent compensates for the dilution, allowing quantitative yield to be maintained while using cheaper contact gas as the sulfonating agent.
Solution Approach 2:
The patent introduces ethionic acid as an intermediary solvent that enables the use of diluted sulfur trioxide. This intermediary medium allows contact gas to function effectively as the sulfonating agent, bridging the gap between cost reduction and maintaining quantitative yield.
3Productivity
If two stage process is used for direct sulfonation, then reaction can be carried out, but the reaction heat is inherently difficult to remove in the first stage at temperature of 0-5° C.
Solution Approach 1:
The patent segments the reaction system into multiple zones within a single stage: a reaction zone where sulfonation occurs and a cooling zone where heat is removed. This spatial segmentation allows the exothermic reaction to proceed while heat is continuously removed, eliminating the need for two-stage temperature control.
Solution Approach 2:
The patent implements continuous cooling throughout the reaction process rather than allowing temperature buildup. The cooling means operates continuously to maintain optimal temperature, enabling single-stage operation while managing the exothermic heat effectively.
4Ease of manufacture
If contact gas is used as sulfonating agent, then cost is reduced, but productivity is limited by contact time and absorption efficiency
Solution Approach 1:
The patent uses a falling film reactor that utilizes gravity-driven liquid flow to create intimate contact between the gas-phase contact gas and liquid-phase ethionic acid. This hydraulic arrangement maximizes mass transfer and absorption efficiency, overcoming the limitations of gas-liquid contact time while maintaining low cost through use of contact gas.
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 achieves a practically quantitative yield of high-purity ethionic acid, simplifies heat management, and enables easy scaling of production capacity while eliminating the need for toxic solvents and reducing operational expenses.
Implementation Method 1
reacting ethanol and sulfur trioxide in a molar ratio of 1:2 in a falling film reactor while cooling the reactor with a cooling means
Implementation Method 2
falling film reactor
Data Source
AI summary
The present invention discloses a process for the production of ethionic acid by reacting ethanol with sulfur trioxide in a molar ratio of 1:2 at a temperature from 40 to 100° C. in a falling film reactor while cooling the reactor with a cooling means.