公开(公告)号：DE59006196D1

公开(公告)日：1994-07-28

申请号：DE59006196

申请日：1990-08-16

Applicant: BASF AG

Inventor： STECK WERNER DR ,  RUST HARALD ,  LERMER HELMUT DR ,  FRITZ NAEUMANN DR

IPC: C07C253/34 ,  C07C255/50

Abstract: A process for the separation of ortho-, meta- and para-tolunitrile from ternary mixtures of isomers entails removing ortho-tolunitrile from these mixtures by distillation under pressures of from 102 and 105 Pa and with a reflux ratio of from 1:1 to 200:1, and distilling the remaining binary mixture of meta- and para-tolunitrile to concentrate to more than 75 mol-% para-tolunitrile, and freezing out the paratolunitrile at below 26 DEG C., and a process for the preparation of suitable ternary mixtures of isomers entails isomerization of pure ortho-, meta- or para-tolunitrile or mixtures thereof at from 380 DEG to 580 DEG C. on zeolite catalysts.

公开(公告)号：DE59005265D1

公开(公告)日：1994-05-11

申请号：DE59005265

申请日：1990-11-28

Applicant: BASF AG

Inventor： HESSE MICHAEL DR ,  STECK WERNER DR ,  LERMER HELMUT DR ,  FISCHER ROMAN DR ,  SCHWARZMANN MATTHIAS DR

IPC: C07C209/60

公开(公告)号：DE3940349A1

公开(公告)日：1991-06-13

申请号：DE3940349

申请日：1989-12-06

Applicant: BASF AG

Inventor： HESSE MICHAEL DR ,  STECK WERNER DR ,  LERMER HELMUT DR ,  SCHWARZMANN MATTHIAS DR ,  FISCHER ROMAN DR

IPC: C07C209/60

公开(公告)号：DE3619746A1

公开(公告)日：1987-12-17

申请号：DE3619746

申请日：1986-06-12

Applicant: BASF AG

Inventor： MAIR GUNTHER DR ,  STECK WERNER DR

IPC: C01G53/00 ,  A61K49/18 ,  C01G49/00 ,  C01G51/00 ,  C09K9/00 ,  H01F1/36 ,  H01F1/37 ,  H01F1/44 ,  C01G1/02 ,  C09C1/24 ,  C09C3/00 ,  C06D5/00

Abstract: Superparamagnetic solid particles of the general formula I MvMnwZnxFeyOz(I) where M is Co and/or Ni, v and w are each from 0 to 0.998, x is from 0.001 to 0.998, y is from 2.001 to 2.998, z is from 3.001 to 4, v+w+x is from 0.002 to 0.999, v+w+x+y is 3, v NOTEQUAL 0 if w=0 and w NOTEQUAL 0 or v=0, polar and nonpolar superparamagnetic liquids which contain the surfactant-coated superparamagnetic solid particles I in the form of a colloidal dispersion in polar or nonpolar liquid media, and processes for the preparation of polar and nonpolar superparamagnetic liquids.

公开(公告)号：DE3600624A1

公开(公告)日：1987-07-16

申请号：DE3600624

申请日：1986-01-11

Applicant: BASF AG

Inventor： STECK WERNER DR ,  MAROSI LASZLO DR ,  HABERKORN HERBERT DR ,  FESER RAINER DR ,  HUEBNER WERNER ,  JAKUSCH HELMUT DR

IPC: G11B5/706 ,  C01G37/027 ,  B05D5/12

Abstract: The invention relates to a process for stabilizing acicular (needle-shaped) ferromagnetic chromium dioxide by treatment with alkali metal hydroxides in aqueous alkaline suspension at elevated temperature.

公开(公告)号：DE3536116A1

公开(公告)日：1987-04-16

申请号：DE3536116

申请日：1985-10-10

Applicant: BASF AG

Inventor： STECK WERNER DR ,  MAROSI LASZLO DR ,  HABERKORN HERBERT DR ,  FESER RAINER DR ,  HUEBNER WERNER ,  JAKUSCH HELMUT DR

IPC: H01F1/11 ,  C01G37/027 ,  G11B5/706 ,  G11B5/84

Abstract: The invention relates to a process for stabilising acicular (needle-shaped) ferromagnetic chromium dioxide by treatment with alkali metal hydroxides in an aqueous alkaline suspension at elevated temperature.

公开(公告)号：DE3407722A1

公开(公告)日：1985-09-05

申请号：DE3407722

申请日：1984-03-02

Applicant: BASF AG

Inventor： STECK WERNER DR ,  JAKUSCH HELMUT DR ,  EBENHOECH FRANZ LUDWIG DR

IPC: C01G49/02 ,  C01G51/00 ,  C09C1/24 ,  G11B5/706 ,  C01G49/00 ,  G11B5/62

公开(公告)号：DE2860071D1

公开(公告)日：1980-11-13

申请号：DE2860071

申请日：1978-07-28

Applicant: BASF AG

Inventor： BRODT RUDOLF DR ,  JAKUSCH HELMUT DR ,  KOESTER EBERHARD DR ,  LOESER WERNER DR ,  OHLINGER MANFRED DR ,  SARNECKI WILHELM DR ,  STECK WERNER DR

IPC: C01G49/08 ,  C01G49/06 ,  G11B5/62 ,  G11B5/70 ,  G11B5/706 ,  H01F1/11

Abstract: A process for the manufacture of acicular ferrimagnetic iron oxide by dehydrating acicular iron(III) oxide hydroxides to give acicular iron(III) oxides, then reducing these iron(III) oxides at from 300 DEG to 650 DEG C. by means of an organic compound which decomposes in this temperature range, and oxidizing the reduced product with an oxygen-containing gas at from 200 DEG to 500 DEG C., wherein the acicular iron(III) oxide hydroxides employed consist of a mixture of goethite and lepidocrocite, containing at least 60% of the latter, and the dehydration is carried out at from 250 DEG to 700 DEG C.

公开(公告)号：DE2606418A1

公开(公告)日：1977-09-01

申请号：DE2606418

申请日：1976-02-18

Applicant: BASF AG

Inventor： LOESER WERNER DIPL ING DR ,  MAYER DIETER DR ,  STECK WERNER DR ,  TREPTOW WOLFRAM DR ,  BOEHN HUGO

IPC: G11B5/64 ,  G11B5/72 ,  G11B5/84 ,  G11B5/858 ,  C25D11/02

公开(公告)号：ES2055837T3

公开(公告)日：1994-09-01

申请号：ES90115637

申请日：1990-08-16

Applicant: BASF AG

Inventor： STECK WERNER DR ,  RUST HARALD ,  LERMER HELMUT DR ,  FRITZ NAEUMANN DR

IPC: C07C253/34 ,  C07C255/50

Abstract: A process for the separation of ortho-, meta- and para-tolunitrile from ternary mixtures of isomers entails removing ortho-tolunitrile from these mixtures by distillation under pressures of from 102 and 105 Pa and with a reflux ratio of from 1:1 to 200:1, and distilling the remaining binary mixture of meta- and para-tolunitrile to concentrate to more than 75 mol-% para-tolunitrile, and freezing out the paratolunitrile at below 26 DEG C., and a process for the preparation of suitable ternary mixtures of isomers entails isomerization of pure ortho-, meta- or para-tolunitrile or mixtures thereof at from 380 DEG to 580 DEG C. on zeolite catalysts.