公开(公告)号：DE19628009A1

公开(公告)日：1998-01-15

申请号：DE19628009

申请日：1996-07-11

Applicant: BASF AG

Inventor： JAEGER MICHAEL ,  GRIMMER KARL ,  ROTTENSTEINER ALEXANDER ,  NITZSCHMANN ROBERT DR ,  PURUCKER BERNHARD DR

IPC: C05G1/00 ,  C05G1/06 ,  C05G3/00 ,  C05G5/00 ,  F28D9/00 ,  F28F3/14 ,  F28F3/00

Abstract: Aqueous salt solutions, especially acidic salt solutions, produced in the manufacture of mineral fertiliser granulates, are evaporated in a plate heat exchanger in which the solutions are heated by steam conducted in separate directions of flow.

公开(公告)号：FI931277A

公开(公告)日：1993-09-25

申请号：FI931277

申请日：1993-03-23

Applicant: BASF AG

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

IPC: B01D53/58

公开(公告)号：GB2315435A

公开(公告)日：1998-02-04

申请号：GB9715376

申请日：1997-07-22

Applicant: BASF AG

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

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

Abstract: In a process and an apparatus for the joint purification in a wash column (VII) by means of a washing liquid (5) of the waste gases (1,3) and/or vapors (2) formed in the production of inorganic fertilizers, the waste gases (1,2,3) introduced into the wash column are sprayed with a wash liquid (11) after their entry into the lower part of the wash column. The column is typically a filled column with waste gas distribution elements disposed below the filler and spray nozzles near the distributors.

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：NO931059L

公开(公告)日：1993-09-27

申请号：NO931059

申请日：1993-03-23

Applicant: BASF AG

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

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

公开(公告)号：DE3868360D1

公开(公告)日：1992-03-26

申请号：DE3868360

申请日：1988-06-24

Applicant: BASF AG

Inventor： KRABETZ RICHARD DR ,  DUEMBGEN GERD DR ,  MERGER FRANZ DR ,  JAEGER MICHAEL ,  THIESSEN FRITZ DR ,  VOGEL HERBERT DR

IPC: B01J27/19 ,  C07B63/04 ,  C07C51/00 ,  C07C51/235 ,  C07C51/25 ,  C07C57/05 ,  C07C57/055 ,  C07C57/07 ,  C07C67/00

Abstract: Prodn. of methacrylic acid (I) by gas phase oxidn. of methacrolein (IIA) or isobutyraldehyde (IIB) with gas mixts. contg. O2 and steam is carried out on catalysts (III) contg. Mo and P at 250-400 deg.C. The hot reaction gas is cooled to under 100 deg.C and passed to an absorption column operating with water below 100 deg.C for absorption of the (I) formed, then partly recycled to the reactor after adding the reqd. amt. of (II) and O2. The novel features are that: (a) (II) in an amt. equal to the amt. consumed is added in liq. form to the reaction gas in the lower two-thirds of the absorption column, in conjunction with polymerisation inhibitors (IV); and (b) a side stream of the reactor gas is taken before addn. of (II) or after the absorption column, and scrubbed in a scrubbing column operating with water at 0 to under 10 deg.C to remove unreacted (II) and this is passed to the top of the absorption column as aq. soln.

公开(公告)号：DE3721865A1

公开(公告)日：1989-01-12

申请号：DE3721865

申请日：1987-07-02

Applicant: BASF AG

Inventor： KRABETZ RICHARD DR ,  DUEMBGEN GERD DR ,  MERGER FRANZ DR ,  JAEGER MICHAEL ,  THIESSEN FRITZ DR ,  VOGEL HERBERT DR

IPC: B01J27/19 ,  C07B63/04 ,  C07C51/00 ,  C07C51/235 ,  C07C51/25 ,  C07C57/05 ,  C07C57/055 ,  C07C57/07 ,  C07C67/00

Abstract: Methacrylic acid can be prepared with advantage by gas phase oxidation of methacrolein or isobutyraldehyde over Mo- and P-containing catalysts at from 250 DEG to 400 DEG C. with cooling of the hot reaction gas to below 100 DEG C., absorption of the methacrylic acid in a water-operated absorption column, at below 100 DEG C. and partial recycling into the oxidation reactor after admixture of methacrolein or isobutyraldehyde and oxygen by feeding a quantity of methacrolein or isobutyraldehyde equal to the quantity of methacrolein or isobutyraldehyde consumed in the reaction in liquid form together with a polymerization inhibitor into the reactor gas in the lower two-thirds of the absorber column and upstream of the feed point for the fresh methacrolein or isobutyraldehyde or down-stream of the absorption column splitting off the reactor off-gas a side stream which is washed in a wash column operated with water at