First-stage conversion rate in sulfuric acid production

The first-stage conversion rate in sulfur-based acid production refers to the efficiency with which sulfur is oxidized to sulfur dioxide during the process of producing acid by burning sulfur. There are many factors that influence this conversion rate, mainly including the following aspects: 1. Purity of sulfur: If sulfur contains impurities, it may affect the combustion efficiency, thereby impacting the conversion rate ； 2. Catalyst activity: Catalysts can increase the rate of chemical reactions; if their activity decreases, it may lead to a reduction in the conversion rate ； 3. Reaction temperature: The reaction temperature for sulfur combustion also affects the conversion rate; both too low and too high temperatures can impact the combustion efficiency ； 4. Contact area between sulfur and oxygen: The larger the contact area between sulfur and oxygen, the higher the conversion rate of the reaction may be. Regarding your question, if an inlet stream meets the temperature requirement of 420 degrees but the conversion rate is not satisfactory and the outlet temperature is low, the possible reasons are as follows: 1. Reduced catalyst activity or catalyst poisoning: If the catalyst’s activity decreases, the reaction rate will slow down, resulting in an unsatisfactory conversion rate ； 2. Heat dissipation during the reaction process: If heat dissipation is poor during the reaction, the reaction heat cannot be effectively utilized, resulting in a decrease in the outlet temperature ； 3. There is an issue with the reaction materials: poor quality of sulfur or oxygen can affect the conversion rate. However, this is only a general explanation; the specific reasons may need to be analyzed based on the actual equipment and operating conditions. .