Q&A on Purification Technology [016]

Factors affecting it: ① Excess water-to-vapor ratio； ② The bed temperature is too high ； ③ The concentration of hydrogen sulfide in the process gas is too low. A lower water vapor ratio, a lower bed temperature, and a higher H2S concentration help to suppress the occurrence of desulfurization reactions. In production, the occurrence of reverse sulfidation is primarily prevented by ensuring that the hydrogen sulfide content in the process gas remains above the allowable level. Generally, based on operational experience, a level of not less than 1000 ppm is recommended.

(1) Water vapor ratio; (2) Bed temperature; (3) H2S concentration in the process gas. A lower water vapor ratio, a lower bed temperature, and a higher H2S concentration help prevent the catalyst from becoming back-flowed

Temperature, water vapor ratio, hydrogen sulfide purity, pressure

The main factors are: 1) water-to-vapor ratio； 2) Bed temperature ； 3) The concentration of hydrogen sulfide in water gas. A lower water vapor ratio, a lower bed temperature, and a higher H2S concentration help to suppress the occurrence of desulfurization reactions. In production, the occurrence of reverse sulfidation is primarily prevented by ensuring that the hydrogen sulfide content in the process gas remains above the allowable level.

The influencing factors include: (1) water-vapor ratio； (2) Bed temperature ； (3) Concentration of H2S in the process gas. A lower water vapor ratio, a lower bed temperature, and a higher H2S concentration help to suppress the occurrence of desulfurization reactions. In production, this phenomenon is prevented by ensuring that the H2S content in the process gas remains above the allowable level.

Answer: The influencing factors are: (1) water-to-gas ratio; (2) bed temperature; (3) H2S concentration in the process gas. A lower water vapor ratio, a lower bed temperature, and a higher H2S concentration help to suppress the occurrence of desulfurization reactions; in production, this is achieved by ensuring that the H2S concentration remains above the allowable level

Influencing factor: water-to-vapor ratio； Bed temperature ； Control the hydrogen sulfide concentration in the process gas by regulating the water vapor ratio, bed temperature, and inlet hydrogen sulfide content

Factors affecting it: ① Excess water-to-vapor ratio； ② The bed temperature is too high ； ③ The concentration of hydrogen sulfide in the process gas is too low. A lower water vapor ratio, a lower bed temperature, and a higher H2S concentration help to suppress the occurrence of desulfurization reactions. In production, the occurrence of reverse sulfidation is primarily prevented by ensuring that the hydrogen sulfide content in the process gas remains above the allowable level. Generally, based on operational experience, a level of not less than 1000 ppm is recommended.

1. Water-gas ratio 2. Bed temperature 3. Concentration of hydrogen sulfide in the water gas.

The desulfurization of cobalt-molybdenum catalysts refers to the transformation of the metal sulfides, which are the active components of these catalysts, into metal oxides under certain conditions, with hydrogen sulfide being released as a result; this causes the catalysts to lose their activity. This phenomenon is known as the desulfurization reaction of sulfur-resistant shift catalysts. The main processes involved are the oxidation of MoS2 and the release of sulfur. The reaction equation is: MoS2 + 2H2O = MoO2 + 2H2S. The primary reasons for this desulfurization reaction are abnormal operating conditions, such as too high an inlet temperature, too low a hydrogen sulfide content in the gas, or an excessively high gas-to-vapor ratio. To prevent desulfurization, it is necessary to ensure that the hydrogen sulfide content in the gas entering the shift reactor is not lower than the minimum level required to counteract desulfurization