| FCC gasoline is one of the important component of gasoline pool in our country, its sulfur content influences the sulfur content of gasoline pool directly. With the gradual strictness of the environmental laws, the requirement for the quality of gasoline is getting higher. It has resulted in a continuing world wide effort to reduce sulfur levels in gasoline. At present, many techniques have been developed to reduce the sulfur for FCC gasoline, such as selective hydrogenation sulfurization (HDS), steam catalytic desulfurization. biode-desulfurization, solvent extraction desulfurization, oxide desulfurization, adsorption desulfurization, etc.The sulfur content of FCC gasoline can be reduced obviously by HDS, but the olefines will be reduced at the same time, so the gasoline's octane number is decreased, especially for the FCC gasoline with high content of olefnes. Many materials can remove the sulfur, oxygenic and nitrogenous compounds from FCC gasoline by adsorption , and molecular sieve and metal oxide can selectively absorb a series of sulfur compounds(such as thiol, thiophene, ect). A new technology has been investigated to remove the sulfur of FCC gasoline without octane number loss, in which a sorbent is used to absorb the sulfur of FCC gasoline.The experiment was conducted in 100ml pilot plant using the FCC gasoline with the sulfur content 1290 μg/g. The result shows that sulfur content of the FCC gasoline has been reduced to less than 800 μg/g, 400 μg/g and 200 μg/g, and the deactivated sorbent can be regenetated by desorption agent. The sorbent needn't be regenetated by burning frequently, so the sorbent's optimal state can retain for a long time.A series of sorbents were prepared .The result shows that the efficiency rises with the temperature increase in the range 30~90℃, and the efficiency declines with the temperature increase in the range 90~150℃, but different carriers have the diverse influences by temperature. The alumina is discussed primarily in this article. |
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