公开(公告)号：DE2704963A1

公开(公告)日：1978-08-10

申请号：DE2704963

申请日：1977-02-07

Applicant: BASF AG

Inventor： SCHREINER SIEGFRIED DIPL CHEM ,  LUKAS SIEGMAR DIPL CHEM DR ,  MUEHLPFORDT WERNER DIPL CHEM D ,  MOLIN GERHARD DIPL ING

IPC: B65G27/00 ,  B65G27/04

Abstract: The vibratory conveyor distributes material in bulk over a number of points, having a trough-shaped or tubular passage coupled to a vibrator. It has a number of discharge openings along it, together with a loading device at the inlet end. Between the discharge openings (1) and metering devices (6, 7) for the receiving stations flexible connections (4, 5) are provided, acting as buffer storage chambers. The portion of each connection fixed to the conveyor (2) can widen towards the metering device. Each connection can comprises a moving pipe (4) discharging into a funnel-shaped passage (5), over whose outlet there fits a length of pipe (6) sliding towards the receiving station and forming the metering device.

公开(公告)号：DE2915792A1

公开(公告)日：1980-10-30

申请号：DE2915792

申请日：1979-04-19

Applicant: BASF AG

Inventor： LUKAS SIEGMAR DIPL CHEM DR ,  TREIBER GERT DIPL CHEM DR ,  SCHREINER SIEGFRIED DIPL CHEM ,  VOELKL ERFRIED DIPL CHEM DR ,  APPL MAX DIPL CHEM DR

IPC: C01B17/66

Abstract: Dust-free dithionites, esp. Na2S2O4, are prepd. by mixing the dithionites with 0.1-3 (esp. 0.2-0.7) wt.% polypropylene oxides having mol. wt. 50-1200. Dithionites are used as bleaching agents in textiles-, pulp- and paper industry and as reducing agents for vat dyes. Dithionites are stabilised against decompsn. by moisture and air-O2 and can be compacted by pressing. Dust-formation and handling is prevented. The prods. dissolve in water and do not foam when dissolved in dye-baths with stirring.

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：DE2646825A1

公开(公告)日：1978-04-20

申请号：DE2646825

申请日：1976-10-16

Applicant: BASF AG

Inventor： LEUTNER BERND DIPL CHEM DR ,  CSIZI GOTTHARD DIPL CHEM DR ,  LUKAS SIEGMAR DIPL CHEM DR ,  SCHREINER SIEGFRIED DIPL CHEM ,  VOELKL ERFRIED DIPL CHEM DR

IPC: C25B1/00 ,  C25B1/14

Abstract: Concentrated dithionite solutions are produced by cathodic reduction of an aqueous solution, containing sulfite and/or bisulfite, which is circulated by pumping. The cathode and anode chambers are separated from one another by a permselective cation exchanger membrane. The catholyte must be circulated at least 10 times per hour and the selective catholyte volume outside the cell, defined as a = Vtotal -VC/Vtotal, SHOULD BE LESS THAN 0.9.

公开(公告)号：DE2847687A1

公开(公告)日：1980-05-22

申请号：DE2847687

申请日：1978-11-03

Applicant: BASF AG

Inventor： BITTLER KNUT DIPL CHEM DR ,  KIENER VOLKER DIPL CHEM DR ,  OSTERTAG WERNER DIPL CHEM DR ,  REBAFKA WALTER DIPL CHEM DR ,  REICH HANS HEINER DIPL CHEM DR ,  SCHREINER SIEGFRIED DIPL CHEM ,  TREPTOW WOLFRAM DIPL CHEM DR ,  VOELKL ERFRIED DIPL CHEM DR

IPC: C01B17/66

Abstract: A dithionite, partic. Na dithionite, is stabilised by addn. of a combination of (a) a metallic soap of oleic acid and/or its sarcoside and/or an invert soap; (b) a 4-6C dicarboxylic acid and/or a fatty alcohol ether-sulphate of formula R'-O-CH2-CH2-O-CH2-CH2-O-SO3H (where R1 is a 12-14C hydrocarbyl). The dithionite is used e.g. in vat dyeing and in the paper industry. The stabilised dithionite is very stable w.r.t. humidity and air, is practically free from dust, and has excellent flow characteristics. It dissolves completely in water.

公开(公告)号：DE2748935A1

公开(公告)日：1979-05-03

申请号：DE2748935

申请日：1977-11-02

Applicant: BASF AG

Inventor： OSTERTAG WERNER DIPL CHEM DR ,  ERTL GERT DIPL CHEM DR ,  WUNSCH GERD DIPL CHEM DR ,  KIENER VOLKER DIPL CHEM DR ,  VOELKL ERFRIED DIPL CHEM DR ,  SCHREINER SIEGFRIED DIPL CHEM

IPC: C01B17/66

Abstract: Prodn. of Na dithionite (I) comprises adding to a suspension of Na2S2O5.HCOONa (II) in a mixt. of water and alcohol (is not >50 wt.% water) a source of protons to give pH is not 4.1. Pref. the medium contains methanol and 10-20 wt.% water, and the acid in H2SO3 generated by passing SO2 through the suspension. Esp. 1-6 wt. pts. solvent are used per pt. (II). By keeping pH >=4.1 side reactions, esp. those leading to thiosulphate, are suppressed and yields of (I) improved.

公开(公告)号：DE2651418A1

公开(公告)日：1978-05-24

申请号：DE2651418

申请日：1976-11-11

Applicant: BASF AG

Inventor： REICH HANS HEINER DIPL CHEM DR ,  KIENER VOLKER DIPL CHEM DR ,  SARNECKI WILHELM DIPL CHEM DR ,  SCHREINER SIEGFRIED DIPL CHEM ,  WUNSCH GERD DIPL CHEM DR

IPC: C01B17/66 ,  C01D20060101 ,  C07C53/06

Abstract: Treating residual mother liquor from prepn. of Na dithionate by reacting SO2 with Na formate and a Na cpd. with a basic reaction in aq. alcoholic medium, comprises distn to separate the alcohol and the organic formate, then acidification to pH 3.0-4.5, heating the soln. to 75-110 degrees C sepg. the S. pptd., and isolating the Na formate by evapn. and cooling. Alternatively, the soln. can be evapd. to dryness, then taken up at 50-100 degrees C in a soln. of Na formate satd. at 20-30 degrees C, filtering, cooling and sepn. of the crystallised formate. No polluting substance is released, while some of the initial reactants of the dithionate prepn. can be recycled.

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%).