公开(公告)号：FI832250A0

公开(公告)日：1983-06-20

申请号：FI832250

申请日：1983-06-20

Applicant: BASF AG

Inventor： HARTMANN HORST ,  KAIBEL GERD ,  KIENER VOLKER ,  WOERZ OTTO

IPC: C07F20060101 ,  C07F

公开(公告)号：CA1119379A

公开(公告)日：1982-03-09

申请号：CA300102

申请日：1978-03-30

Applicant: BASF AG

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

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.degree.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. The process has the advantage that in the first step the reaction gives, within a short period and at a relatively low temperature, aqueous methanolic solutions of sodium formate, which in the second step can be directly converted to sodium dithionite.

公开(公告)号：CA1085687A

公开(公告)日：1980-09-16

申请号：CA282438

申请日：1977-07-11

Applicant: BASF AG

Inventor： BOEHN HUGO ,  TREPTOW WOLFRAM ,  WUNSCH GERD ,  KIENER VOLKER ,  MEYER HERMANN ,  CSIZI GOTTHARD

IPC: C25B11/055 ,  C25B11/091 ,  C25B11/10

Abstract: Manufacture of electrodes consisting or bases or valve metals with electrochemically active coatings applied thereto. The electrodes are pretreated before the said coatings are applied, the pre-treatment comprising treating the base with hydrogen.

公开(公告)号：CA1067676A

公开(公告)日：1979-12-11

申请号：CA233469

申请日：1975-08-14

Applicant: BASF AG

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

IPC: C01B31/26 ,  C01B17/66 ,  C01D5/00

Abstract: For the preparation of anhydrous sodium dithionite by the reaction of sulfur dioxide with sodium formate and caustic soda in the presence of organic solvents, sulfur dioxide is passed, together with the formate, into a liquid containing all of the caustic soda required for the reaction. This initial liquid may contain, in addition to the caustic soda, a portion of the sulfur dioxide or formate required for the reaction. This process gives high yields of sodium dithionite at constant purity and cristal size of the product in a simpler procedure of an industrially more practicable nature without these results being subject to undue fluctuations of an uncontrollable kind.

公开(公告)号：NO772838L

公开(公告)日：1978-02-28

申请号：NO772838

申请日：1977-08-15

Applicant: BASF AG

Inventor： BOEHN HUGO ,  TREPTOW WOLFRAM ,  WUNSCH GERD ,  KIENER VOLKER ,  MEYER HERMANN ,  CSIZI GOTTHARD

IPC: C25B11/055 ,  C25B11/091 ,  C25B

Abstract: Manufacture of electrodes consisting of bases of valve metals with electrochemically active coatings applied thereto. The electrodes are pre-treated before the said coatings are applied, the pre-treatment comprising treating the base with hydrogen.