中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

69 records (took 0.023 seconds)

    32.
    发明专利
    未知

    公开(公告)号：ES2164445T3

    公开(公告)日：2002-02-16

    申请号：ES98934975

    申请日：1998-06-18

    Applicant: BASF AG

    Inventor： WATZENBERGER OTTO ,  SCHELLING HEINER ,  PFAB PETER ,  STROFER ECKHARD

    IPC: B01D3/00 ,  C01B21/14

    Abstract: PCT No. PCT/EP98/03714 Sec. 371 Date Dec. 8, 1999 Sec. 102(e) Date Dec. 8, 1999 PCT Filed Jun. 18, 1998 PCT Pub. No. WO98/57886 PCT Pub. Date Dec. 23, 1998A very pure aqueous solution of free hydroxylamine is prepared by a process in which the dilute, aqueous hydroxylamine solution is concentrated in a column by removing hydroxylamine-containing vapors via a side take-off in the bottom of the column, and very pure hydroxylamine is obtained by condensing the vapors. The novel process can be carried out simply, in a gentle manner and on a large scale and gives electronic grade hydroxylamine.

    METHOD FOR PRODUCING AN AQUEOUS SOLUTION OF FREE HYDROXYLAMINE
    34.
    发明专利
    METHOD FOR PRODUCING AN AQUEOUS SOLUTION OF FREE HYDROXYLAMINE 未知

    公开(公告)号：CA2299475A1

    公开(公告)日：1999-02-18

    申请号：CA2299475

    申请日：1998-08-04

    Applicant: BASF AG

    Inventor： MAUER PETER ,  WATZENBERGER OTTO ,  STROFER ECKHARD ,  SCHNEIDER HANS-MICHAEL ,  SCHELLING HEINER

    IPC: C01B21/14

    Abstract: The invention relates to a method for producing an aqueous solution of free hydroxylamine by treating a hydroxylammonium salt with ammonia in the countercurrent in a stripping column. As a result, hydroxylamine is released and at the same time, the solution obtained is separated into an aqueous hydroxylamine solution and a salt fraction by distillation. The inventive method is simple and mild, and can be carried out on a large scale. The risk of decomposition is minimal due to the low thermal burden, the low concentration of hydroxylamine and the short residence time involved in the process.

    METHOD FOR PRODUCING AN AQUEOUS SOLUTION OF FREE HYDROXYLAMINE
    36.
    发明专利
    METHOD FOR PRODUCING AN AQUEOUS SOLUTION OF FREE HYDROXYLAMINE 未知

    公开(公告)号：CA2299475C

    公开(公告)日：2008-12-02

    申请号：CA2299475

    申请日：1998-08-04

    Applicant: BASF AG

    Inventor： SCHNEIDER HANS-MICHAEL ,  STROFER ECKHARD ,  SCHELLING HEINER ,  WATZENBERGER OTTO ,  MAUER PETER

    IPC: C01B21/14

    Abstract: The invention relates to a method for producing an aqueous solution of free hydroxy-lamine by treating a hydroxylammonium salt with ammonia in the counter-current in a stripping column. As a result, hydroxylamine is released and at the same time, the solution obtained is separated into an aqueous hydroxylamine solution and a salt fraction by distillation. The inventive method is simple and mild, and can be carried out on a large scale. The risk of decomposition is minimal due to the low thermal burden, the low concentration of hydroxylamine and the short residence time involved in the process.

    37.
    发明专利
    未知

    公开(公告)号：NO20075864L

    公开(公告)日：2008-03-05

    申请号：NO20075864

    申请日：2007-11-15

    Applicant: BASF AG

    Inventor： STROFER ECKHARD ,  HASSE HANS ,  BLAGOV SERGEJ

    IPC: C07C41/50 ,  C07C43/30

    Abstract: A process for preparing polyoxymethylene dialkyl ethers of the formula H2m+1CmO(CH2O)nCmH2m+1 where n=2-10, m, identically or differently,=1 or 2, in which a dialkyl ether selected from dimethyl ether, methyl ethyl ether and diethyl ether, and trioxane are fed into a reactor and reacted in the presence of an acidic catalyst, the amount of water introduced into the reaction mixture by the dialkyl ether, trioxane and/or the catalyst being

    38.
    发明专利
    未知

    公开(公告)号：NO20080315L

    公开(公告)日：2008-02-27

    申请号：NO20080315

    申请日：2008-01-18

    Applicant: BASF AG

    Inventor： STROFER ECKHARD ,  STAMMER ACHIM ,  HASSE HANS ,  LANG NEVEN ,  SIEGERT MARKUS ,  FRIESE THORSTEN ,  BLAGOV SERGEJ ,  GRUETZNER THOMAS

    IPC: C07D323/06

    Abstract: The invention relates to an integrated process for preparing trioxane from formaldehyde in which, in a first step, a stream A 1 comprising water and formaldehyde and a recycle stream B 2 consisting substantially of water and formaldehyde are fed to a trioxane synthesis reactor in which the formaldehyde is converted to trioxane to obtain a product stream A 2 comprising trioxane, water and formaldehyde. Stream A 2 and a recycle stream D 1 comprising trioxane, water and formaldehyde are fed to a first distillation column and distilled at a pressure in the range from 0.1 to 2.5 bar to obtain a stream B 1 enriched in trioxane, and the stream B 2 consisting substantially of water and formaldehyde. Stream B 1 is fed to a second distillation column and distilled at a pressure in the range from 0.2 to 17.5 bar to obtain a product stream C 2 consisting substantially of trioxane, and a stream C 1 comprising trioxane, water and formaldehyde. Stream C 1 is fed to a third distillation column and distilled at a pressure in the range from 1 to 10 bar to obtain the recycle stream D 1 comprising trioxane, water and formaldehyde, and a stream D 2 consisting substantially of water.

Patent Agency Ranking