(19)
(11) EP 1 614 658 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A2)

(48) Corrigendum issued on:
07.03.2012 Bulletin 2012/10

(88) Date of publication A3:
11.07.2007 Bulletin 2007/28

(43) Date of publication:
11.01.2006 Bulletin 2006/02

(21) Application number: 05107673.5

(22) Date of filing: 18.09.1998
(51) International Patent Classification (IPC): 
C01B 39/06(2006.01)
C01B 37/00(2006.01)
 C01B 39/08(2006.01)
(84) Designated Contracting States:
BE CH DE DK ES FR GB LI LU NL

(30) Priority: 03.10.1997 IT MI972250

(60) Divisional application:
10179898.1 / 2258658

(62) Application number of the earlier application in accordance with Art. 76 EPC:
98117721.5 / 0906784

(71) Applicant: Polimeri Europa S.p.A.
72100 Brindisi (IT)

(72) Inventors:
  • Carati, Angela
    20098 San Giuliano Milanese Milano (IT)
  • Bellusi, Giuseppe
    29100 Piacenza (IT)
  • Mantegazza, Mariangela
    20040 Cambiago-Milano (IT)
  • Petrini, Guido
    28066 Galliate-Novarra (IT)

(74) Representative: Coletti, Raimondo et al
Barzanò & Zanardo Milano S.p.A. Via Borgonuovo, 10
20121 Milano
20121 Milano (IT)

 
Remarks:
This application was filed on 22 - 08 - 2005 as a divisional application to the application mentioned under INID code 62.
 


(54) Process for preparing zeolites


(57) A process is described for the preparation of zeolitic catalysts in the form of microspheres, comprising zeolite and oligomeric silica, characterized by a high mechanical resistance. The process consists in subjecting to rapid drying the suspension, to which tetra-alkylorthosilicate is optionally added, resulting from the synthesis of zeolite by hydrothermal treatment at autogenous pressure of the reagent mixture containing tetra-alkylammoniumhydroxide as templating agent, and subjecting the product resulting from the drying to calcination.