Absorption Performance And Viscosity In H₂S Removal Process Using MEA Activated MDEA Aqueous Solution

In this thesis,an absorbent was proposed by blending N-methyldiethanolamine?MDEA?with monoethanolamine?MEA?.The absorption performance of low-partial-pressure H₂S in the absorbent and the corresponding solution viscosity were studied.The temperatures ranged from 303.2 to 323.2 K.The partial pressure of H₂S ranged from 300 to 500 Pa.The mass fractions of MDEA(w_MDEA)and MEA(w_MEA)ranged from 0.300 to 0.500 and 0 to 0.075,respectively.The temperature and mass fraction dependences of solution viscosity were analyzed and the effects of H₂S partial pressure,temperatures and mass fractions on the absorption capacity,H₂S loading and apparent absorption rate were demonstrated.Our results showed that:?1?At given temperature,given w_MDEA and w_MEA,both the absorption capacity and H₂S loading increase with increasing H₂S partial pressure,and the apparent absorption rate increases significantly with increasing H₂S partial pressure;?2?At given H₂S partial pressure,given w_MDEA and w_MEA,the absorption capacity and H₂S loading decrease with increasing temperature,but the apparent absorption rate increases with increasing temperature;?3?At given temperature,given H₂S partial pressure and given w_MDEA,the absorption capacity and H₂S loading increase with increasing w_MEA,and the apparent absorption rate increases slightly with increasing w_MEA;?4?At given temperature,given H₂S partial pressure and given w_MEA,the H₂S loading and the apparent absorption rate decrease with increasing w_MDEA,while the mass of the absorbed H₂S firstly increases then decreases with increasing w_MDEA;?5?The solution viscosity increases with increasing mass fraction of amines and decreases with increasing temperature.