Multi-Stage Deacon Process for Chlorine Gas Production
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Solution Overview
Problem
The catalytic oxidation of hydrogen chloride for producing chlorine gas faces challenges such as high energy consumption, low yield, and short catalyst lifetime due to uncontrolled exothermic reactions, leading to increased costs and environmental concerns.
Innovation Solution
A method involving multi-stage feeding of reactants with partial product gas stream recycling and heat management to control reaction temperatures, extending catalyst life and reducing energy consumption by using a series of adiabatic reactors with integrated heat exchangers for efficient heat utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional catalytic oxidation method is used, then chlorine gas can be produced from hydrogen chloride, but the catalyst lifetime is short due to uncontrolled exothermic reactions and high temperatures
Solution Approach 1:
The patent divides the catalytic oxidation process into multiple stages with separate reactors. Each reactor operates at controlled temperature conditions, preventing the uncontrolled exothermic reactions that previously caused catalyst degradation. The multi-stage approach segments the overall reaction into manageable steps, maintaining catalyst activity throughout the process.
Solution Approach 2:
The patent introduces an intermediary cooling system between reactor stages that acts as a heat buffer. This intermediary mechanism absorbs excess heat from exothermic reactions and redistributes it controlledly, preventing temperature spikes that would otherwise damage the catalyst while maintaining optimal reaction conditions.
2Use of energy by moving object
If conventional direct oxidation method is used, then chlorine gas production can proceed, but energy consumption is high due to lack of heat utilization
Solution Approach 1:
The patent implements continuous heat exchange between reactor stages, where heat generated in earlier stages is continuously transferred to subsequent stages. This creates a continuous cycle of useful thermal energy utilization, eliminating idle heat loss and maintaining optimal reaction temperatures throughout the process without external energy input.
Solution Approach 2:
The patent converts the harmful effect of exothermic heat generation into a beneficial resource by capturing and redistributing this heat to other reaction stages. The previously wasted thermal energy becomes a useful input for maintaining reaction temperatures, turning energy loss into energy gain and significantly reducing overall energy consumption.
3Productivity
If conventional single-stage oxidation is used, then the process is simple, but the yield is low and reaction control is poor
Solution Approach 1:
The patent employs multiple reactors arranged in series, with each reactor optimized for specific conversion requirements. This segmentation allows progressive conversion of hydrogen chloride to chlorine gas across stages, achieving high overall yield while maintaining simple individual reactor designs. The multi-stage configuration transforms a complex high-yield requirement into multiple simple stages.
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 significantly prolongs catalyst lifetime, reduces production costs, and achieves efficient chlorine gas production with improved reaction control, meeting industrialization requirements and environmental standards.
Implementation Method 1
The catalytic oxidation method, particularly the Deacon catalytic oxidation
Implementation Method 2
the catalytic oxidation of hydrogen chloride is exothermic
Data Source
Figure 1~2
Figure 3
AI summary
Disclosed is a method for preparing chlorine gas through catalytic oxidation of hydrogen chloride, and more particularly a method for preparing chlorine gas by carrying out one-time hydrogen chloride feeding and multi-stage oxygen feeding and/or one-time oxygen feeding and multi-stage hydrogen chloride feeding, returning a product gas stream without separation thereof, and optionally carrying out heat insulation means. According to the present invention, an excessive reaction heat concentration is prevented, therefore, the method of the present invention is a chlorine gas recovery method implemented through the Deacon catalytic oxidation of hydrogen chloride that can be industrialized.