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Back to the List of the Granted Patents                                                Click here to download AP2099 PDF

(11)    Patent No :    AP 2099   
(21)    Application No :    AP/P/2003/002760   
(22)    Filing Date :    14.09.2001   
(24)    Date of Grant &    04.02.2010   
           
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
DE    100 45 465.8    14.09.2000

(84)    Designated State

KE   SZ   ZW

(73) Applicant(s)

PROSERPINE CO-OPERATIVE SUGAR MILLING

ASSOCIATION LIMITED, P. O. Box 101, Proserpine,
Queensland, 4800,

Australia
(72) Inventors

ZEITSCH KARL J., Germany

(74) Representative

GALLOWAY & COMPANY
 
(51)  International  Classification   C07D307/50 (2006.01)    C07D307/00 (2006.01)

(54)    Title

Gaseous acid catalysis

(57)    Abstract

A method of gaseous acid catalysis which finds particular applications in the manufacture of furfural includes the steps of introducing a solid reactant containing one or more hydroxyl groups into a reactor (1); introducing superheated steam from a superheater (2) until the temperature within the reactor (1) is higher than that of the dew points of both water and the catalyst and the reactant is dry. The catalyst is then introduced into the superheated steam by vaporiser (3). Product gas formed is liquified in condenser (4) and the condensate collected in a buffer tank (5). Separation plant 6 isolates the product gas and recovers the acid catalyst, preferably as its azeotrope with water, and recycles it into the vaporiser.


(56)  Documents Cited :    US 4 001 283 A

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