Process for purification of linear paraffins with recycle

Details Process for purification of linear paraffins with recycle Process for purification of linear paraffins with recycle

C - Chemistry, Metallurgy

10

G

C10G 25/00 (2006.01)

Patent

CA 2094607

A process for purifying linear paraffins in which a hydrocarbon feedstream containing linear paraffins contaminated with aromatics, sulfur-, nitrogen-, and oxygen-containing compounds, and color bodies, and also containing up to about 5 wt% desorbent from effluent recycle, is contacted with a solid adsorbent such as a NaX zeolite or zeolite MgY; after adsorption the adsorbent is desorbed with an alkyl- substituted aromatic desorbent, such as toluene. As the adsorbent bed is being desorbed, the initial effluent from the adsorption cycle will contain levels of desorbent and may be recycled to the hydrocarbon feedstream. Previous to the removal of impurities from the adsorbent by desorption, the desorbent displaces interstitial linear paraffins which are also recycled to the hydrocarbon feedstream.

Divulgation d'un procédé pour purifier des paraffines linéaires, au cours duquel on met en contact un circuit d'alimentation d'hydrocarbures, contenant des paraffines linéaires contaminées par des composés aromatiques, des composés soufrés, azotés ou oxygénés et des corps colorés, et contenant également jusqu'à 5 %, en poids, d'agent de désorption provenant du recyclage d'effluents, avec un adsorbant solide comme de la zéolite NaX ou de la zéolite MgY. Après adsorption, on fait désorber l'adsorbant à l'aide d'un composé aromatique substitué par un alkyle, comme le toluène. Pendant la désorption, l'effluent initial du cycle d'adsorption contiendra des teneurs en agent de désorption et pourra être recyclé vers le circuit d'alimentation d'hydrocarbures. Avant l'élimination des impuretés de l'adsorbant par désorption, l'agent de désorption déplace des paraffines linéaires interstitielles qui sont également recyclées vers le circuit d'alimentation d'hydrocarbures.

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