公开(公告)号：ES2050348T3

公开(公告)日：1994-05-16

申请号：ES90124073

申请日：1990-12-13

Applicant: BASF AG

Inventor： WUNDER RAINER DR ,  NITZSCHMANN ROBERT E DR ,  MEYER BERND DR

IPC: B01D53/34 ,  B01D53/58 ,  C05C1/00

公开(公告)号：DE3608540A1

公开(公告)日：1987-09-17

申请号：DE3608540

申请日：1986-03-14

Applicant: BASF AG

Inventor： ARNDT VOLKER DR ,  MEYER BERND DR ,  FESER RAINER DR ,  STECK WERNER DR ,  JAKUSCH HELMUT DR

IPC: C01G49/06 ,  C09C1/24 ,  G11B5/706 ,  H01F1/11 ,  C09C3/00 ,  C09C1/62 ,  C21B15/00

Abstract: Acicular alpha -Fe2O3 is prepared from iron(III) salts by heating an alkaline aqueous suspension of iron(III) hydroxide in the presence of one or more organic substances which form complexes with iron(III) ions to a temperature of 100 DEG C. or less.

公开(公告)号：DE19731504A1

公开(公告)日：1998-01-29

申请号：DE19731504

申请日：1997-07-22

Applicant: BASF AG

Inventor： MEYER BERND DR ,  GRIMMER KARL ,  NITZSCHMANN ROBERT DR ,  JAEGER MICHAEL ,  PURUCKER BERNHARD DR ,  WUNDER RAINER DR

IPC: B01D53/58 ,  B01D53/78 ,  C05B11/06 ,  C05G1/06 ,  B01D47/06 ,  B01D47/14

Abstract: Joint purification in a wash column using a washing liquid of waste gases and/or vapours formed in the production of inorganic fertilisers comprises supplying the waste gases and/or vapours to the wash column in at least two separate streams. One of the gas streams is preferably a collective waste gas stream containing the waste gases and/or vapours having a high water content and a high proportion of ammonia (NH3) and where another of the streams is a collective waste gas stream from granulation and drying having a low water content and a low content of ammonia (NH3). The separate streams are distributed using individual distributor systems under fittings in the wash column, the granulation and drying gas stream being distributed above the first stream in the wash column. The wash column (VII) is filled with filling or packing materials (VIIA) and 2 or more separate collective waste gases supply lines connected to separate distributors (IX, X) below the filling in the wash column.

公开(公告)号：DE3732526A1

公开(公告)日：1989-04-06

申请号：DE3732526

申请日：1987-09-26

Applicant: BASF AG

Inventor： SCHWAB EKKEHARD DR ,  ARNDT VOLKER DR ,  FESER RAINER DR ,  MEYER BERND DR

IPC: C01G49/06 ,  G11B5/706

Abstract: The invention relates to a process for preparing acicular alpha -iron(III) oxide hydroxide by reacting an aqueous solution of an iron(II) salt with aqueous solutions of alkali metal hydroxides at elevated temperature and oxidising the suspensions thus obtained of iron(II) hydroxide with oxygen-containing gases to give the alpha -iron(III) oxide hydroxide.

公开(公告)号：DE4209498A1

公开(公告)日：1993-09-30

申请号：DE4209498

申请日：1992-03-24

Applicant: BASF AG

Inventor： WUNDER RAINER DR ,  NITSCHMANN ROBERT E DR ,  MEYER BERND DR ,  KLING GEORG DR ,  MINX EKKEHARD DR ,  PURUCKER BERNHARD DR ,  GRIMMER KARL ,  JAEGER MICHAEL

IPC: B01D53/58 ,  C02F1/16 ,  B01D47/14 ,  B01D53/34

公开(公告)号：DE3765989D1

公开(公告)日：1990-12-13

申请号：DE3765989

申请日：1987-04-18

Applicant: BASF AG

Inventor： MELZER MILENA ,  MEYER BERND DR ,  SOMMERMANN FRIEDRICH DR ,  KLUMPP PETER ,  KREITNER LUDWIG DR ,  LENZ WERNER DR

IPC: C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  G11B5/708 ,  G11B5/71 ,  G11B5/72

公开(公告)号：DE3614148A1

公开(公告)日：1987-10-29

申请号：DE3614148

申请日：1986-04-26

Applicant: BASF AG

Inventor： MELZER MILENA ,  MEYER BERND DR ,  SOMMERMANN FRIEDRICH DR ,  KLUMPP PETER ,  KREITNER LUDWIG DR ,  LENZ WERNER DR

IPC: C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  G11B5/708 ,  G11B5/71 ,  G11B5/72 ,  B05D5/12

公开(公告)号：DE19731505A1

公开(公告)日：1998-01-29

申请号：DE19731505

申请日：1997-07-22

Applicant: BASF AG

Inventor： MEYER BERND DR ,  GRIMMER KARL ,  NITZSCHMANN ROBERT DR ,  JAEGER MICHAEL ,  REUVERS JOHANNES DR ,  KLING GEORG DR ,  PURUCKER BERNHARD DR ,  WUNDER RAINER DR ,  MECKL STEFAN DR

IPC: B01D53/58 ,  B01D53/78 ,  C05B11/06 ,  C05G1/06 ,  B01D47/06 ,  B01D47/14

Abstract: A process for purification of waste gases and vapours formed during the production of inorganic fertilizers comprises a wash column (VII) filled with packing material. A gas distributor (IX) placed below the wash column, has spray nozzles (XI) for introduction of a washing liquid (11) to the gas distributors. Also claimed is an apparatus for carrying out the process described above.

公开(公告)号：AT102847T

公开(公告)日：1994-04-15

申请号：AT90124073

申请日：1990-12-13

Applicant: BASF AG

Inventor： WUNDER RAINER DR ,  NITZSCHMANN ROBERT E DR ,  MEYER BERND DR

IPC: B01D53/34 ,  B01D53/58 ,  C05C1/00

公开(公告)号：DE3780048D1

公开(公告)日：1992-08-06

申请号：DE3780048

申请日：1987-03-11

Applicant: BASF AG

Inventor： ARNDT VOLKER DR ,  MEYER BERND DR ,  FESER RAINER DR ,  STECK WERNER DR ,  JAKUSCH HELMUT DR

IPC: C01G49/06 ,  C09C1/24 ,  G11B5/706 ,  H01F1/11

Abstract: The ferrite is formed by heating an alkaline, pH pref. 8.5-12, watery suspension of ferric-hydroxide, pref. after filtration and redispersion at 15-60 deg. C at least once, in soln. with at least one organic cpd., e.g. tartaric or citric acid, which forms complexes with ferric-ions. The reaction occurs, pref. after adding alpha-ferrite seedcrystals, in 2 steps with the first at 70-90 deg. C for 1/2 2 hours and the second consecutively for 20-60 hours at 90-100 deg. C. The alpha-ferrite is then converted into needle-shaped gamma-ferrite by reduction to magnetite and subsequent oxidation. Alternatively it can be converted into needle shaped magnetic crystals consisting essentially of Fe.