Weekly Topic in Ammonia Synthesis Production: How to reduce raw material consumption in the tannin desulfurization process?

This post was last edited by Luo Hu 15185080221 on 2011-4-5 at 15:50. 1. The concentration of tannin should not be too high; it is generally advisable not to exceed 4 g/L, as otherwise the solution will have excessive viscosity, which affects the flotation and separation of sulfur. 2. When using soda ash to absorb H2S, it is essential to strictly control the solution temperature. Under normal conditions, the temperature should be kept around 45°C. When the temperature is above 30°C, the solution absorbs H2S at a rapid rate, which in turn accelerates the precipitation of sulfur. When the temperature exceeds 60°C, the side reaction leading to the formation of Na2S2O3 intensifies significantly, resulting in an increase in alkali consumption. 3. Since H2S is an acidic gas, the desulfurization solution must maintain a certain pH level, which is generally kept between 8.5 and 9.2. Too low a pH value is not conducive to the absorption of H2S and the oxidative regeneration of the tannin solution; too high a pH value accelerates side reactions, leads to a higher rate of by-product formation, affects the speed of sulfur precipitation, results in poor sulfur recovery, and increases alkali consumption. The pH level can be adjusted by modifying the total alkalinity and sodium carbonate content. 4. Under normal conditions, the liquid-to-gas ratio is 1:2 to 1:4. If the gas volume is too high, Na2S2O3 will be oxidized to Na2SO4; if the gas volume is too low, regeneration will not be complete, resulting in little elemental sulfur being produced, and the oxygen-carrying catalyst cannot be fully regenerated, which affects the desulfurization efficiency as well as the consumption of chemical raw materials.

I’ve finished training; I’ll be starting work soon, in the desulfurization position