Does the absorption of hydrogen sulfide by amine solution release heat or cause a temperature drop?
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The amine solution entering the circulating hydrogen desulfurization tower is at 50 degrees, and the gas leaving the tower has a temperature of around 36 degrees. Why then is the rich liquid coming out of the desulfurization tower only at 30 degrees? Does the absorption of hydrogen sulfide by the amine solution involve heat release or a cooling process?
Heat is released; it’s an acid-base reaction, the temperature of the gas is low, and water vaporizes into the gas
The high-pressure gas outlet temperature depends primarily on the high-pressure gas inlet temperature; moreover, the adsorption of hydrogen sulfide is an exothermic reaction
Derived from thermodynamics, according to G=H-TS: the absorption process by a gas is a process of entropy reduction; for a spontaneous reaction, the Gibbs free energy decreases, so the enthalpy value must also decrease, which is manifested as heat release. Regarding the actual import and export temperatures, factors such as heat dissipation and heat carried away by gases come into play.