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We do Desulfurization to remove sulfur becase (1) Sulfur is poisonous for catalyst (2) it produce bad odour & SO2 combustion is harmful for environment.
we proceed to the desulfurization of oils because sulfur compounds - sulfur- are harmful catalysts, to their unpleasant odor, production of sulfide oxide gas during combustion.
a result of some refining process (eg catalytic cracking) a significant fraction of nitrogen may be present in light cuts and deteriorating quality : storage instability , brown color, formation of rubbers...