公开(公告)号：DE2723156A1

公开(公告)日：1978-12-07

申请号：DE2723156

申请日：1977-05-23

Applicant: BASF AG

Inventor： OSTERTAG WERNER DR ,  WUNSCH GERD DR ,  KIENER VOLKER DR ,  ERTL GERT DR ,  HETZEL ECKHARD DIPL ING ,  SCHREINER SIEGFRIED DR ,  VOELKL ERFRIED DR ,  KOESTER HARTWIG DR

IPC: C01B17/66

Abstract: Prodn. of anhydrous Na dithionite (I) by reacting SO2 with Na formate and NaOH in aq. -alcoholic medium, is now carried out in presence of alkali and/or ammonium salts of oxalic acid and/or EDTA. Pref. the concn. of chelating agent at the end of reaction is not below 0.001 g./l. Decomposition of (I) induced by metal ions (esp. Fe, Cr and Ni, introduced with the reactants or generated by corrosion of the reactor) is inhibited by the chelating agents.

公开(公告)号：CH641425A5

公开(公告)日：1984-02-29

申请号：CH621479

申请日：1979-07-03

Applicant: BASF AG

Inventor： OSTERTAG WERNER DR ,  ERTL GERT DR ,  BITTLER KNUT DR ,  HETZEL ECKHARD ,  SALADIN GUENTER ,  APPL MAX DR ,  VOELKL ERFRIED DR ,  PFORR GERHARD DR ,  WUNSCH GERD DR

IPC: C01F7/60