Application of microporous carbon adsorbent for reducing the...

C - Chemistry – Metallurgy – 10 – G

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C10G 25/06 (2006.01) B01D 53/02 (2006.01) C07C 7/12 (2006.01)

Patent

CA 2673080

The present invention relates to the use of adsorbent microporous carbon material (AMC), obtained from the pyrolysis of copolymers generically known under the name Saran, in adsorption processes for reducing the benzene content of hydrocarbon flows with a distillation temperature corresponding to that of gasoline, between 27 and 191 ºC, which processes preferably first involve distillation separation of the C6's fraction, and afterwards separation of the Benzene by adsorption through a bed of adsorbent material, thereby obtaining the C6's fraction free of Benzene and adsorbent with Benzene, which is subsequently regenerated by means of desorption by pressure or temperature changes, or by displacement through a desorbent such as inert gas at high temperature, wherein the desorbent containing the Benzene is fed into a distillation section in order to separate the Benzene from the desorbent, resulting in Benzene and desorbent.

La présente invention concerne l'application d'un matériau adsorbant microporeux de carbone (AMC), obtenu par pyrolyse de copolymères connus sous le nom générique de Saran, dans des procédés d'adsorption visant à réduire la teneur en benzène de courants d'hydrocarbures à une température de distillation correspondant à celle de l'essence, entre 27°C et 191°C. Ces procédés consistent, dans un premier temps, à séparer par distillation la fraction C6's, puis à séparer le benzène par adsorption à l'aide d'un lit de matériau adsorbant. On obtient ainsi la fraction C6's exempte de benzène et l'adsorbant avec le benzène, lequel est par la suite régénéré par désorption par changements de pression ou de température, ou par déplacement à l'aide d'un moyen de désorption, tel qu'un gaz inerte à haute température. L'élément de désorption contenant le benzène est acheminé vers une section de distillation pour séparer le benzène de l'élément de désorption. Cette étape permet d'obtenir, d'une part, le benzène et, d'autre part, l'élément de désorption.

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