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1. WO2002022593 - GASEOUS ACID CATALYSIS

Publication Number WO/2002/022593
Publication Date 21.03.2002
International Application No. PCT/ZA2001/000146
International Filing Date 14.09.2001
Chapter 2 Demand Filed 15.04.2002
IPC
C07D 307/50 2006.01
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
DHETEROCYCLIC COMPOUNDS
307Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
02not condensed with other rings
34having two or three double bonds between ring members or between ring members and non-ring members
38with substituted hydrocarbon radicals attached to ring carbon atoms
40Radicals substituted by oxygen atoms
46Doubly bound oxygen atoms, or two oxygen atoms singly bound to the same carbon atom
48Furfural
50Preparation from natural products
CPC
C07D 307/50
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
DHETEROCYCLIC COMPOUNDS
307Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
02not condensed with other rings
34having two or three double bonds between ring members or between ring members and non-ring members
38with substituted hydrocarbon radicals attached to ring carbon atoms
40Radicals substituted by oxygen atoms
46Doubly bound oxygen atoms, or two oxygen atoms singly bound to the same carbon atom
48Furfural
50Preparation from natural products
Applicants
  • INTERNATIONAL FURAN TECHNOLOGY (PTY) LIMITED [ZA]/[ZA] (AllExceptUS)
Inventors
  • ZEITSCH, Karl, J.
Agents
  • MORRISON, Ian
Priority Data
100 45 465.814.09.2000DE
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) GASEOUS ACID CATALYSIS
(FR) CATALYSE ACIDE GAZEUSE
Abstract
(EN)
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.
(FR)
L'invention concerne un procédé de catalyse acide gazeuse qui s'applique dans la fabrication de furfural, et qui consiste à introduire un réactif solide contenant un ou plusieurs groupes hydroxyle dans un réacteur (1), à introduire de la vapeur surchauffée d'une unité de surchauffe (2) jusqu'à ce que la température à l'intérieur du réacteur (1) soit supérieure à celle des points de rosée de l'eau et du catalyseur, et jusqu'à ce que le réactif soit sec. Le catalyseur est alors introduit dans la vapeur surchauffée par un atomiseur (3). Le produit gazeux formé est liquéfié dans un condensateur (4) et le condensat et recueilli dans un réservoir tampon (5). Une usine de séparation (6) isole le produit gazeux et récupère le catalyseur acide, de préférence comme son azéotrope avec l'eau, et le recycle dans l'atomiseur.
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