公开(公告)号：DE2415170A1

公开(公告)日：1975-10-09

申请号：DE2415170

申请日：1974-03-29

Applicant: BASF AG

Inventor： VOELKL ERFRIED DIPL CHEM DR ,  LUKAS SIEGMAR DIPL CHEM DR ,  SCHREINER SIEGFRIED DIPL CHEM ,  WERNER DIETMAR DIPL CHEM DR ,  WUNSCH GERD DIPL CHEM DR ,  KIENER VOLKER DIPL CHEM DR ,  KOESTER HARTWIG DIPL CHEM DR

IPC: C01B17/66 ,  C01D5/14

Abstract: Anhydrous Na dithionite is prepd. by reacting SO2 with Na formate in a solvent comprising a mixt. of an aq. alcohol and a pyrrolidone of formula (I) (where R is 1-6C alkyl or aryl), with the proviso that after all the reactants have been added, the alcohol + (I) make up 65-90 (pref. 70-85) wt. % of the total solvent and the concn. of (I) in the alcohol + (I) mixt. is 10-60 (pref. 25-40) wt. %. Anhydrous Na2S2O4 is useful as a reducing agent. The process gives high yields based on SO2 (e.g. 83-91%) high space-time yields (e.g. 0.028-0.062 kg/l. hr) and a high-purity product (e.g. with a purity of ca. 90%).

公开(公告)号：DE2703282A1

公开(公告)日：1978-08-10

申请号：DE2703282

申请日：1977-01-27

Applicant: BASF AG

Inventor： KIENER VOLKER DIPL CHEM DR ,  AUTZEN HORST DIPL CHEM DR ,  KOESTER HARTWIG DIPL CHEM DR ,  WUNSCH GERD DIPL CHEM DR ,  OSTERTAG WERNER DIPL CHEM DR ,  SCHREINER SIEGFRIED DIPL CHEM ,  VOELKL ERFRIED DIPL CHEM DR ,  HETZEL ECKARD DIPL CHEM

IPC: C01B17/66

Abstract: Anhydrous sodium dithionite is prepd. by the action of SO2 on NaOOCH in excess and NaOH in a reaction medium formed of H2O and an organic solvent. Methyl formate is also added to the reaction mixt. in a proportion which is =15 wt. % w.r.t. the organic solvent, and pref. when the reaction mixt. contains >=66% of the theoretical amt. of SO2 to be used. The molar proportions of NaOH and SO2 do not exceed the ratio 1:2. The process gives increased yields of a purer and more stable sodium dithionite, with a better granules size distribution. Pref. the initial reaction mixt. contains all the NaOH required in the form of an aq. soln., possibly contg. a part of the NaOOCH and/or the SO2. The remaining NaOOCH and SO2, as well as the cH3OOCH, are then added to this initial reaction mixt.

公开(公告)号：DE2319361A1

公开(公告)日：1974-11-07

申请号：DE2319361

申请日：1973-04-17

Applicant: BASF AG

Inventor： SCHULZ GERHARD DIPL CHEM DR ,  ZIRKER GUENTER DIPL CHEM DR ,  WUNSCH GERD DIPL CHEM DR ,  GEIERHAAS HERBERT DIPL CHEM DR ,  KIENER VOLKER DIPL CHEM DR ,  KOESTER HARTWIG DIPL CHEM DR

IPC: C22B3/06 ,  C22B3/14 ,  C22B15/00 ,  C22B15/08

Abstract: Cu is extracted from spent catalysts contg. Cu and/or oxides of Cu, Zn, Al and Cr which have been used for CO conversion, or methanol synthesis, by adjusting the mole ratio of ZnO/Al2O3 in the mixt. to 1:0.9 to 1:1.2 by addn. of ZnO and/or Al2O3, and heating the mixt. to at least 800 degrees C pref. 900-1100 degrees C for 1 hr before separating Cu from the other metals by dissolving in dilute nitric acid or an aq. soln. of an ammonium salt.

公开(公告)号：DE2430631A1

公开(公告)日：1976-01-15

申请号：DE2430631

申请日：1974-06-26

Applicant: BASF AG

Inventor： WERNER DIETMAR DIPL CHEM DR ,  WUNSCH GERD DIPL CHEM DR ,  KIENER VOLKER DIPL CHEM DR ,  KOESTER HARTWIG DIPL CHEM DR

IPC: C01B17/45 ,  C01B17/46

Abstract: Prodn. of SOCl2 by reacting sulphur chlorides with SO2 and Cl2 in the gas phase at 160-240 degrees C and purifying the resulting thienyl chloride by distillation, is improved in that, before the proper distillation, the vapour of crude thionyl chloride is contacted, pref. bubbled through molte sulphur and/or a polysulphur chloride at a temp. between the m. pt. of sulphur and 240 degrees C (pref. 138-160 degrees C). The melt pref. contains as catalysts iron or its cpds. Sulphur is continuously supplemented. SCl2 present in the reaction products is converted into S2Cl2 by reaction with S or polysulphur chlorides. S2Cl2 can be readily sepd. from SOCl2 by distillation (in contrast to SCl2). The yield of SOCL2 is increased to 65-80% theor.; moreover all the by-products, mainly S2Cl2 and SO2, are recycled so that a nearly 100 degrees C conversion is achieved. The resulting thionyl chloride contains up to 1% SCl2; this degree of purity is sufficient for most technical applications. However, if necessary, the product can be further purified by known methods.