公开(公告)号：DE2517713A1

公开(公告)日：1976-11-04

申请号：DE2517713

申请日：1975-04-22

Applicant: BASF AG

Inventor： OSTERTAG WERNER DR ,  WUNSCH GERT DR ,  EBENHOECH FRANZ DR ,  VOELKL ERFRIED DR ,  BOCK GUSTAV DR

IPC: C01G49/00 ,  C09C1/34

Abstract: Prodn. of a readily dispersing fine-grain, brown pigment having the formula: CrxFe2-xO3 (in which 0.1=x=1) is improved in that an aq. soln. of CrO3 (pref. concn. 45-63 wt.%) and/or gaseous CrO2Cl2 is introduced in the form of a spray into a reaction zone in presence of water vapour, gaseous Fe(CO)5 and O2; the reaction is carried out at a temp. >700 degrees C (pref. 700-1000 degrees C); and the resulting solid reaction product remains in the reaction zone for at least 1 sec. (pref. up to 10 sec.) before the withdrawal. These pigments are temp. resistant and light fast. Their prodn. is more convenient than the usual wet coprecipitation of the components, with subsequent sepn. and calcination. These are no- by-products, and high purity pigments are obtd. The colour can be easily controlled (increasing Cr content and, to a lesser extent, prolonged residence time give darker brown colouration.).

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

公开(公告)号：DE3060747D1

公开(公告)日：1982-10-07

申请号：DE3060747

申请日：1980-05-02

Applicant: BASF AG

Inventor： PFORR GERHARD DR ,  PESCHAU GERHARD ,  SCHIPPMANN GUENTER ,  APPL MAX DR ,  VOELKL ERFRIED DR ,  STARK HANS DR

IPC: B01D46/34

Abstract: De-dusting of gases is carried out in an apparatus containing a granular-bed filter, the pourable granular filter medium flowing downward through the bed. The apparatus comprises a vessel of rectangular cross-section with a vertical side wall (4) extending from the top to the bottom. A partition (5), arranged parallel to the side wall (4), extends from the upper end of the vessel into the interior of the vessel. The remaining three side walls of the vessel extend - at least starting from a level corresponding to the lower end of the partition (5), taperingly downward to the outlet (9). The partition (5) is supported by the two walls adjacent to the vertical wall and forms, together with these and with the talus (7) of the filter medium, which arises at the lower end of the partition, a chamber (3) into which the inlet (2) for the gas to be purified opens. At the inlet (10) for the filter medium, located at the upper end of the partition, a further talus (12) of the filter medium forms, defining a collecting chamber (16), in which the outlet (17) for the purified gas is located.

公开(公告)号：DE3060095D1

公开(公告)日：1982-01-28

申请号：DE3060095

申请日：1980-05-02

Applicant: BASF AG

Inventor： DUEMBGEN GERD DR ,  VOELKL ERFRIED DR ,  PFORR GERHARD DR

IPC: B01D53/68 ,  B01D53/02 ,  B01D53/34 ,  B01D53/86

Abstract: To destroy phosgene contained in gases, the phosgene is decomposed catalytically in the presence of active carbon by hydrolysis with water vapor, in the absence of liquid water, at above the dew point of water.

公开(公告)号：DE2716032A1

公开(公告)日：1978-10-26

申请号：DE2716032

申请日：1977-04-09

Applicant: BASF AG

Inventor： OSTERTAG WERNDER DR ,  WUNSCH GERD DR ,  KIENER VOLKER DR ,  HETZEL ECKHARD DIPL ING ,  SCHREINER SIEGFRIED DR ,  LEUTNER BERND DR ,  SCHLIMPER HANS-ULRICH DR ,  VOELKL ERFRIED DR

IPC: C01B17/66 ,  C07C51/00 ,  C07C53/06 ,  C07C67/00

Abstract: In a process for the manufacture of sodium dithionite by reacting sulfur dioxide with sodium formate and aqueous sodium hydroxide solution in the presence of methanol, an aqueous methanolic solution of sodium formate is first produced by reacting carbon monoxide with sodium hydroxide solution in an aqueous medium, containing from 1 to 50% by weight of methanol, based on the amount of water, at from 80 to 120 DEG C. under a pressure of from 10 to 40 bars. The resulting aqueous methanolic solution can be reacted directly, in the conventional manner, with sulfur dioxide and aqueous sodium hydroxide solution to give sodium dithionite.

公开(公告)号：DE2442418A1

公开(公告)日：1976-03-18

申请号：DE2442418

申请日：1974-09-05

Applicant: BASF AG

Inventor： VOELKL ERFRIED DR ,  SCHREINER SIEGFRIED DR ,  WUNSCH GERD DR ,  KIENER VOLKER DR ,  KOESTER HARTWIG DR ,  WAIBEL RUDI DIPL ING DR

IPC: C01B31/26 ,  C01B17/66

公开(公告)号：DE2962529D1

公开(公告)日：1982-05-27

申请号：DE2962529

申请日：1979-12-01

Applicant: BASF AG

Inventor： APPL MAX DR ,  VOELKL ERFRIED DR ,  GIESLER ERICH DR

IPC: C23C2/30 ,  C23C1/12 ,  C23C1/02

公开(公告)号：DE2919661A1

公开(公告)日：1980-11-27

申请号：DE2919661

申请日：1979-05-16

Applicant: BASF AG

Inventor： DUEMBGEN GERD DR ,  VOELKL ERFRIED DR ,  PFORR GERHARD DR

IPC: B01D53/68 ,  B01D53/02 ,  B01D53/34 ,  B01D53/86 ,  A62D3/00

Abstract: To destroy phosgene contained in gases, the phosgene is decomposed catalytically in the presence of active carbon by hydrolysis with water vapor, in the absence of liquid water, at above the dew point of water.

公开(公告)号：DE2918779A1

公开(公告)日：1980-11-20

申请号：DE2918779

申请日：1979-05-10

Applicant: BASF AG

Inventor： PFORR GERHARD DR ,  PESCHAU GERHARD DIPL ING ,  SCHIPPMANN GUENTER ,  APPL MAX DR ,  VOELKL ERFRIED DR ,  STARK HANS

IPC: B01D46/34

Abstract: De-dusting of gases is carried out in an apparatus containing a granular-bed filter, the pourable granular filter medium flowing downward through the bed. The apparatus comprises a vessel of rectangular cross-section with a vertical side wall (4) extending from the top to the bottom. A partition (5), arranged parallel to the side wall (4), extends from the upper end of the vessel into the interior of the vessel. The remaining three side walls of the vessel extend - at least starting from a level corresponding to the lower end of the partition (5), taperingly downward to the outlet (9). The partition (5) is supported by the two walls adjacent to the vertical wall and forms, together with these and with the talus (7) of the filter medium, which arises at the lower end of the partition, a chamber (3) into which the inlet (2) for the gas to be purified opens. At the inlet (10) for the filter medium, located at the upper end of the partition, a further talus (12) of the filter medium forms, defining a collecting chamber (16), in which the outlet (17) for the purified gas is located.

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.