公开(公告)号：NO811681L

公开(公告)日：1981-11-20

申请号：NO811681

申请日：1981-05-18

Applicant: BASF AG

Inventor： APPL MAX ,  AUHORN WERNER ,  LUKAS SIEGMAR ,  SCHREINER SIEGFRIED ,  TREIBER GERT ,  VOELKL ERFRIED

IPC: D21C20060101 ,  D21C9/10 ,  D21C

公开(公告)号：NO811681A

公开(公告)日：1981-11-20

申请号：NO811681

申请日：1981-05-18

Applicant: BASF AG

Inventor： APPL MAX ,  AUHORN WERNER ,  LUKAS SIEGMAR ,  SCHREINER SIEGFRIED ,  TREIBER GERT ,  VOELKL ERFRIED

IPC: D21C20060101 ,  D21C9/10 ,  D21C

公开(公告)号：CA1177863A

公开(公告)日：1984-11-13

申请号：CA386895

申请日：1981-09-29

Applicant: BASF AG

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

IPC: B01J19/00 ,  B01J19/02 ,  F16L58/18 ,  F16L59/16 ,  F16L59/18 ,  F16L58/00

Abstract: A flange coupling for joining together ends of multi-layer apparatus sections or pipeling sections, in which corrosive and hot gases are handled, each section consisting of an inner lining of glass which is resistant to thermal shock, or of quartz, the inner lining being surrounded by an outer metal jacket, the interspace between the outer jacket and the lining being packed with a heat-insulating material which supports the inner lining. The coupling comprises refractory bricks provided between the lining of a section and the outer jacket at the end portions of said lining, said bricks surrounding without touching the entire surface of the lining at said ends portions thereof. One end of the lining terminates inwardly of the end of the corresponding refractory brick. Flange means are provided for coupling together the adjacent ends of the jackets of two adjacent sections.

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：FI811491L

公开(公告)日：1981-11-20

申请号：FI811491

申请日：1981-05-14

Applicant: BASF AG

Inventor： APPL MAX ,  AUHORN WERNER ,  LUKAS SIEGMAR ,  SCHREINER SIEGFRIED ,  TREIBER GERT ,  VOELKL ERFRIED

IPC: D21C20060101 ,  D21C9/10 ,  D21C

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.