Removal of H2S from crude oil via stripping followed by adsorption using ZnO/MCM-41 and optimization of parameters|
Hazrati, N.; Abdouss, M.; Vahid, A.; Beigi, Miran A. A. & Mohammadalizadeh, A.
In the present work, H2S of crude oil was
removed via a two-step method including stripping followed
by adsorption. First, ZnO/MCM-41 adsorbents
containing 5, 17.5 and 30 wt% of zinc were synthesized
and characterized using XRD and nitrogen physisorption.
Then, these materials were used as adsorbents for the
removal of the H2S stripped from crude oil. At second step,
the H2S of crude oil was extracted to gas phase by hot
stripping. The obtained extract was collected in a storage
tank for the subsequent H2S adsorption process. A threefactor
Box–Behnken design with five center points and one
response was performed for the optimization of adsorption
of H2S. The influence of process parameters and their
interactional effects on the adsorption of H2S were analyzed
using the obtained adsorption experimental data. A
model including three important factors, i.e., temperature,
space velocity and amount of supported zinc and their
interactions, was developed to generate the optimum condition.
The point of Zn = 30 wt%, T = 300 °C and space
velocity = 3,000 h-1 had the optimum point with the
highest break point time (tbp = 973 min).
Box–Behnken design; Crude oil; Hydrogen sulfide; Mesoporous materials; Optimization; Removal; Zinc oxide