Iranian Scientists Indigenize Advanced Nanocatalysts of RCD Unit
One of the most important goals of this process is to reduce the amount of sulfur compounds (HDS) and other pollutants from the feed of RFCC unit and reducing the nanocatalyst consumed in RFCC unit, which is economically very profitable for refineries.
The feed entering the RCD process from the bottoms of atmospheric and vacuum distillation towers (AR, VR) is pumped to the top of fixed bed reactors after passing through the feed filter. The hydrogen output from the makeup compressors also enters the reactors from below, and the HDS reaction takes place in the presence of a nanocatalyst in the reactor. After passing through separators and separating the liquid and gas phases, the output product goes to two sections, fractionator and H2S scrubber, respectively.
In the first section, the products of the unit include light gases, light naphtha, heavy naphtha, and low-sulfur fuel oil. In the second section, sulfur and hydrogen gas are separated by amine. The nanocatalysts used in the RCD unit include nickel-molybdenum/alumina nanocatalysts and cobalt-molybdenum/alumina nanocatalysts. Nickel-molybdenum nanocatalysts enjoy the caopability to hydrogenate compounds, and cobalt-molybdenum nanocatalysts are better at hydrogenation.
The unit of RCD (Reduced Crude Desulfurization) was applied for decreasing of Sulfur, CCR (coradson carbon residue), metals of heavy feeds AR (Atmospheric Residue), VR (Vacuum Residue), and also prepared the feed of RFCC (Reduced Fluid Catalytic Cracking) unit.
The unit includes the following parts; Feed pretreating (Filter) Section, Reactor Section, Fractionator Section, and make-up Hydrogen Compression Section. These compounds were easily converted to H2S, however feedstocks containing heteroatomic aromatic molecules were processed with difficulty. Desulfurization of these compounds was preceded by initial ring opening and sulfur removal followed by saturation of the resulting olefin. Thiophene was processed 15 times more difficult compared to diethylsulfide. Fixed bed reactor type one is used for the process.
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