Circulating Bed Catalytic Reactor for Hydrogen Sulfide Production
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Solution Overview
Problem
Current processes for producing hydrogen sulfide from elemental sulfur and hydrogen require high temperatures, pressures, and stoichiometric excess of sulfur, leading to inefficient sulfur conversion and the formation of polysulfane compounds.
Innovation Solution
A continuous process using a solid catalyst comprising metals from groups VIB and VIII of the Periodic Table, where sulfur is brought into contact with the catalyst at 120-160°C, and the mixture is circulated in a reaction zone with controlled temperature and pressure, allowing complete sulfur conversion to hydrogen sulfide without excess sulfur and minimizing polysulfane formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperature and pressure are used to produce hydrogen sulfide, then reaction rate is improved, but energy consumption and equipment complexity increase
Solution Approach 1:
The invention changes the temperature parameter from conventional high temperature (above 300°C) to low temperature (150-300°C), and changes the pressure parameter from high pressure to atmospheric or slightly elevated pressure. This parameter change enables the reaction to proceed at lower energy input while maintaining acceptable reaction rates through the circulating bed mechanism.
Solution Approach 2:
The invention introduces a circulating bed catalyst as an intermediary substance that facilitates the reaction between sulfur and hydrogen. The catalyst particles circulate continuously, providing active sites for reaction and enabling the process to occur at lower temperatures and pressures than conventional direct reaction methods.
2Productivity
If stoichiometric excess of sulfur is used, then hydrogen sulfide yield is improved, but sulfur conversion efficiency deteriorates and polysulfane compounds are formed
Solution Approach 1:
The invention implements a feedback mechanism where the circulating bed continuously recycles unreacted sulfur and catalyst particles back into the reaction zone. This continuous circulation ensures complete conversion of sulfur to hydrogen sulfide without requiring excess sulfur, and prevents the formation of polysulfane compounds by maintaining optimal reaction conditions throughout the process.
Solution Approach 2:
The circulating bed operates continuously, with catalyst and unreacted sulfur particles constantly circulating between the reaction zone and the sulfur addition point. This continuous action ensures complete sulfur conversion and maintains high hydrogen sulfide yield without the need for stoichiometric excess of sulfur.
3Manufacturing precision
If high temperature is used, then reaction completeness is improved, but temperature control difficulty and heat management complexity increase
Solution Approach 1:
The invention segments the reaction process into multiple zones: a sulfur addition zone, a reaction zone, and a separation zone. The circulating bed allows different portions of the catalyst to be at different stages of the reaction cycle, enabling complete conversion while distributing heat generation across multiple locations and times, thus simplifying temperature control.
Solution Approach 2:
The invention uses a dynamic circulating bed system where catalyst particles continuously move between zones. This dynamic circulation allows the system to adapt to heat generation rates, with particles spending appropriate time in the reaction zone to achieve complete conversion while preventing localized overheating through continuous movement and heat distribution.
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 process achieves high yields of hydrogen sulfide with controlled temperature and pressure, complete sulfur conversion, and minimal polysulfane production, with hydrogen sulfide content exceeding 30% by volume and water content less than 3% by volume in the gaseous effluents.
Implementation Method 1
Contacting sulfur with a solid catalyst comprising at least one metal, selected from the metals of groups VIB and VIII of the Periodic Table of Elements, in the form of metallic sulfide
Implementation Method 2
the reaction of conversion of sulfur to hydrogen sulfide, as well as good use of the heat generated during the reaction in order to control the temperature of the catalyst in the area of contact of the sulfur with the catalyst
Data Source
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AI summary
The present invention relates to a process for producing hydrogen sulfide from hydrogen and elemental sulfur, comprising the following steps: (a) Contacting the sulfur with a solid catalyst comprising at least one metal selected from the metals of groups VIB and VIII of the Periodic Table of Elements, in the form of metallic sulfide, at a temperature ranging from 120 to 160°C; (b) Circulating the mixture of sulfur and catalyst from step (a) in a reaction zone, in which said mixture is contacted with hydrogen, the reaction zone having a temperature at the catalyst inlet point greater than or equal to 150°C and a temperature at the catalyst outlet point less than or equal to 300°C, and a pressure less than or equal to 3 bar; (c) Separating the catalyst from the gaseous effluents containing hydrogen sulfide; and (d) Recycling the catalyst back to step (a).