Crystalline molecular sieve layers and processes for their manufacture

US6689195B1 · kind B1 · utility

Inventors

• Marc H. Anthonis · Hofstade, BE
• Anton-Jan Bons · Kessel-Lo, BE
• Harry W. Deckman · Clinton, US
• Jonas Hedlund · Luleå, SE
• Wenyih F. Lai · Bound Brook, US
• Jacobus Anna Josephus Peters · Alkmaar, NL

Key dates

• Filing date: Jun 20, 2002
• Grant date: Feb 10, 2004
• Expiry date: Jun 20, 2022

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2229/64
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

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 (&agr;x) for para-xylene over meta-xylene of 2 or greater and a permeance (Qx) for para-xylene of 3.27×10−8 mole(px)/m2.s.Pa(px) or greater measured at a temperature of ≧250° C. and an aromatic hydrocarbon partial pressure of ≧10×103 Pa.