Crystalline molecular sieve layers and processes for their...

B - Operations – Transporting – 01 – D

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B01D 71/02 (2006.01) B01J 20/18 (2006.01) B01J 35/06 (2006.01) B01J 37/02 (2006.01)

Patent

CA 2364431

A process is described for the manufacture of crystalline molecular sieve layers with good para-xylene over meta-xylene selectivity's good para-xylene permeances and selectivities. The process requires impregnation of the support prior to hydrothermal synthesis using the seeded method and may be undertaken with pre-impregnation masking. The crystalline molecular sieve layer has a selectivity (.alpha.x) for para-xylene over meta-xylene of 2 or greater and a permeance (Qx) for para-xylene of 3.27 x 10-8 mole(px)/m2.s.Pa(px) or greater measured at a temperature of >= 250 ~C and an aromatic hydrocarbon partial pressure of >= 10 x 103 Pa.

La présente invention concerne un procédé de fabrication de couches de tamis cristallins présentant une bonne sélectivité de paraxylène par rapport au métaxylène et une bonne perméance pour le paraxylène. Dans ce procédé, il est nécessaire d'imprégner le support avant la synthèse hydrothermale au moyen du procédé d'ensemencement, ou alors avec le masquage à préimprégnation. La couche de tamis moléculaire cristallin présente une sélectivité (.alpha.¿x?) de paraxylène par rapport au métaxylène d'au moins 2, et une perméance (Q¿x?) pour le paraxylène d'au moins 3,27 x 10?-8¿ mole(px)/m?2¿.s.Pa(px), mesurée à une température de >=250 ·C et une pression partielle d'hydrocarbures aromatiques >=10 x 10?3¿Pa.

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