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    Process for the purification of frozen-out crystal layers
    11.
    发明专利
    Process for the purification of frozen-out crystal layers 未知

    公开(公告)号：DE3708709A1

    公开(公告)日：1988-10-06

    申请号：DE3708709

    申请日：1987-03-18

    Applicant: BASF AG

    Inventor： HOLZKNECHT BERNHARD DR ,  FUCHS HUGO DR ,  HETZEL ECKHARD ,  WINTERMANTEL KLAUS DR ,  THOMA PETER DR

    IPC: B01D9/00

    Abstract: A process for the purification of frozen-out crystal layers in which these crystal layers, after they have been frozen out of a melt or solution on a cooling surface, are brought into contact with a purification liquid and are thus purified over their entire thickness, are then separated from the purification liquid and are subsequently melted, characterised in that the temperature of the crystal layers and of the purification liquid is in the region of the melting point or solubility point, in that the material transfer at the phase interface is intensified by forced convection, and in that this purification is carried out in a time of from 1 minute to 60 minutes on layers having a thickness from 0.2 mm to 10 mm.

    MANUFACTURE OF SODIUM DITHIONITE
    14.
    发明专利
    MANUFACTURE OF SODIUM DITHIONITE 未知

    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.

    15.
    发明专利
    未知

    公开(公告)号：FR2173031B3

    公开(公告)日：1976-02-13

    申请号：FR7305737

    申请日：1973-02-19

    Applicant: BASF AG

    Inventor： HETZEL ECKHARD ,  KORPIUN OLAF

    IPC: C07C20060101 ,  C07C121/12

    Abstract: 1411180 Perfluorocarboxylic acid nitrites BADISCHE ANILIN- & SODA-FABRIK AG 23 Feb 1973 [25 Feb 1972] 8940/73 Heading C2C Perfluorocarboxylic acid nitriles are prepared by reacting the corresponding perfluorocarbonamide with phosphorus pentoxide in the gas phase at 450-600‹ C. in the presence of an inert carrier gas. The perfluorocarboxamide preferably has 2-16 C atoms, e.g. perfluoroacetamide, -propionamide, -octanamide and -cyclohexylcarbonamide. Preferably 1 to 10 moles of P 2 0 5 are reacted per mole of amide at 460-560‹ 0. for a residence time of 2-20 seconds with nitrogen as the carrier gas. The reaction mixture is advantageously quenched with water to 15-25‹ C.

    16.
    发明专利
    未知

    公开(公告)号：FR2173031A1

    公开(公告)日：1973-10-05

    申请号：FR7305737

    申请日：1973-02-19

    Applicant: BASF AG

    Inventor： HETZEL ECKHARD ,  KORPIUN OLAF

    IPC: C07C20060101 ,  C07C121/12

    Abstract: 1411180 Perfluorocarboxylic acid nitrites BADISCHE ANILIN- & SODA-FABRIK AG 23 Feb 1973 [25 Feb 1972] 8940/73 Heading C2C Perfluorocarboxylic acid nitriles are prepared by reacting the corresponding perfluorocarbonamide with phosphorus pentoxide in the gas phase at 450-600‹ C. in the presence of an inert carrier gas. The perfluorocarboxamide preferably has 2-16 C atoms, e.g. perfluoroacetamide, -propionamide, -octanamide and -cyclohexylcarbonamide. Preferably 1 to 10 moles of P 2 0 5 are reacted per mole of amide at 460-560‹ 0. for a residence time of 2-20 seconds with nitrogen as the carrier gas. The reaction mixture is advantageously quenched with water to 15-25‹ C.

    17.
    发明专利
    未知

    公开(公告)号：NL7302431A

    公开(公告)日：1973-08-28

    申请号：NL7302431

    申请日：1973-02-21

    Applicant: BASF AG

    Inventor： HETZEL ECKHARD ,  KORPIUN OLAF

    IPC: C07C20060101 ,  C07C121/12 ,  C07C121/16

    Abstract: 1411180 Perfluorocarboxylic acid nitrites BADISCHE ANILIN- & SODA-FABRIK AG 23 Feb 1973 [25 Feb 1972] 8940/73 Heading C2C Perfluorocarboxylic acid nitriles are prepared by reacting the corresponding perfluorocarbonamide with phosphorus pentoxide in the gas phase at 450-600‹ C. in the presence of an inert carrier gas. The perfluorocarboxamide preferably has 2-16 C atoms, e.g. perfluoroacetamide, -propionamide, -octanamide and -cyclohexylcarbonamide. Preferably 1 to 10 moles of P 2 0 5 are reacted per mole of amide at 460-560‹ 0. for a residence time of 2-20 seconds with nitrogen as the carrier gas. The reaction mixture is advantageously quenched with water to 15-25‹ C.

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