Light hydrocarbon separation using 8-member ring zeolites

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 7/13 (2006.01)

Patent

CA 2543638

The present invention is related to a method, for kinetically separating a light hydrocarbon mixture comprising at least two components by preferentially adsorbing a first component on a zeolite adsorbent comprising 8-member rings of tetrahedra as the pore opening controlling hydrocarbon diffusion and alkali metal cations balancing a framework charge, wherein a second component is not preferentially adsorbed. The novel process comprises contacting the light hydrocarbon mixture with a zeolite adsorbent having a Si02/A1203 ratio greater than 50 and less than 200 and further having a diffusion rate at least 50 times greater for the first component as compared to the second component, and then recovering at least one of the first component or the second component.

La présente invention concerne un procédé de séparation cinétique d'un mélange d'hydrocarbures légers d'au moins deux composant par adsorption préférentielle d'un premier composant sur un adsorbant zéolite comprenant des noyaux de 8 maillons en tétraèdres constituant les ouvertures des pores régulant la diffusion des hydrocarbures, et des cations de métaux alcalins équilibrant une charge d'agencement général, un second composant n'étant pas adsorbé de façon préférentielle. Le procédé de l'invention consiste à mettre en contact le mélange d'hydrocarbures légers avec un adsorbant zéolite dont le rapport Si0¿2?/A1¿2?0¿3? est supérieur à 50 et inférieur à 200n et présentant une vitesse de diffusion du premier composant d'au moins 50 fois supérieure à celle du second composant, puis à récupérer l'un au moins des deux composants.

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