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1. EP2044011 - METHOD FOR PREPARING METALLIC DIXHYDROXYBENZENEDISULFONATES

Office European Patent Office
Application Number 07730083
Application Date 12.06.2007
Publication Number 2044011
Publication Date 08.04.2009
Publication Kind A1
IPC
C07C 303/32
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
303Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
32of salts of sulfonic acids
C07C 303/22
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
303Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
02of sulfonic acids or halides thereof
22from sulfonic acids by reactions not involving the formation of sulfo or halosulfonyl groups
C07C 309/42
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
309Sulfonic acids; Halides, esters, or anhydrides thereof
01Sulfonic acids
28having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
41containing singly-bound oxygen atoms bound to the carbon skeleton
42having the sulfo groups bound to carbon atoms of non-condensed six-membered aromatic rings
CPC
C07C 303/06
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
303Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
02of sulfonic acids or halides thereof
04by substitution of hydrogen atoms by sulfo or halosulfonyl groups
06by reaction with sulfuric acid or sulfur trioxide
C07C 303/32
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
303Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
32of salts of sulfonic acids
Applicants RHODIA OPERATIONS
Inventors DURY MICHEL
BRES HERVE
Designated States
Title
(DE) VERFAHREN ZUR HERSTELLUNG METALLISCHER DIHYDROXYBENZOLDISULFONATE
(EN) METHOD FOR PREPARING METALLIC DIXHYDROXYBENZENEDISULFONATES
(FR) PROCEDE DE PREPARATION DE DIHYDROXYBENZENEDISULFONATES METALLIQUES
Abstract
(EN)
The subject matter of this invention is a method for preparing metallic dihydroxybenzenedisulfonates, preferably from alkaline metals, from corresponding dihydroxybenzenedisulfonic acids. The method for preparing a metallic dihydroxybenzenedisulfonate according to the invention, from a corresponding dihydroxybenzenedisulfonic acid, is characterized by the fact that it includes the reaction of the dihydroxybenzenedisulfonic acid present in a sulfuric medium with an adequate quantity of a salt including a sulfate or hydrogenosulfate anion.

(FR)
La présente invention a pour objet un procédé de préparation de dihydroxybenzènedisulfonates métalliques, de préférence de métaux alcalins, à partir d'acides dihydroxybenzènedisulfoniques correspondants. Le procédé de préparation d'un dihydroxybenzènedisulfonate métallique selon l'invention, à partir d'un acide dihydroxybenzènedisulfonique correspondant est caractérisé par le fait qu'il comprend la réaction de l'acide dihydroxybenzènedisulfonique présent en milieu sulfurique avec une quantité suffisante d'un sel comprenant un anion sulfate ou hydrogénosulfate.