公开(公告)号：AU2034299A

公开(公告)日：1999-09-23

申请号：AU2034299

申请日：1999-03-10

Applicant: DEGUSSA

Inventor： FOERSTER MARTIN ,  SCHAFER ROBERT ,  HASSELMANN WOLFGANG ,  HOFFMANN MICHAEL ,  MERGNER BERND ,  LEIBOLD WALTER ,  BIRTIGH GERHARD ,  DITTRICH EWALD

IPC: B01D53/86 ,  B01J35/04 ,  B01J37/02 ,  B05D7/22 ,  B28B11/04 ,  C04B41/45 ,  F01N3/28 ,  B05D7/24 ,  B05C19/04 ,  B05C7/04

Abstract: The channels (1) are filled (11) from below, with a quantity up to 10% greater than their empty volume, until the dispersion rises above the upper surface (17). The excess is removed (8, 9) before emptying the channels. Impulsive suction from a low pressure vessel (5) connected with the lower end face of the substrate (1), then clears the passages. The interval between starting to fill and completion of emptying, is no longer than 5 seconds. Preferred Features: The (partial) vacuum vessel (5) has an initial pressure of 150 mbar and a volume 100-1000 times that of the catalyst substrate. During suction, a minimum air velocity of 5 m/s is maintained in the channels. The open flow cross section to the vacuum vessel is adjustable from 0 to a maximum value. When thixotropic or intrinsically-viscous dispersions are used, the interval between filling and sucking-out is so short, that the limit of flowability cannot set in. The substrate is moistened before coating and may be pre-impregnated with acids, bases or salt solutions. Following emptying of the flow channels, before firing, a flow of heated dry air at 50-80 degrees C is passed. This is delivered against the direction of emptying, at a speed of 2-10 m/s, over an interval of 2-60 seconds.

公开(公告)号：PL331816A1

公开(公告)日：1999-09-13

申请号：PL33181699

申请日：1999-03-08

Applicant: DEGUSSA

Inventor： FOERSTER MARTIN ,  DITTRICH EWALD ,  BIRTIGH GERHARD ,  LEIBOLD WALTER ,  MERGNER BERND ,  HOFFMANN MICHAEL ,  HASSELMANN WOLFGANG ,  SCHAEFER ROBERT

IPC: B01J35/04 ,  B01D53/86 ,  B01J37/02 ,  B05D7/22 ,  B28B11/04 ,  C04B41/45 ,  F01N3/28

Abstract: The channels (1) are filled (11) from below, with a quantity up to 10% greater than their empty volume, until the dispersion rises above the upper surface (17). The excess is removed (8, 9) before emptying the channels. Impulsive suction from a low pressure vessel (5) connected with the lower end face of the substrate (1), then clears the passages. The interval between starting to fill and completion of emptying, is no longer than 5 seconds. Preferred Features: The (partial) vacuum vessel (5) has an initial pressure of 150 mbar and a volume 100-1000 times that of the catalyst substrate. During suction, a minimum air velocity of 5 m/s is maintained in the channels. The open flow cross section to the vacuum vessel is adjustable from 0 to a maximum value. When thixotropic or intrinsically-viscous dispersions are used, the interval between filling and sucking-out is so short, that the limit of flowability cannot set in. The substrate is moistened before coating and may be pre-impregnated with acids, bases or salt solutions. Following emptying of the flow channels, before firing, a flow of heated dry air at 50-80 degrees C is passed. This is delivered against the direction of emptying, at a speed of 2-10 m/s, over an interval of 2-60 seconds.

公开(公告)号：CA2265071A1

公开(公告)日：1999-09-10

申请号：CA2265071

申请日：1999-03-09

Applicant: DEGUSSA

Inventor： LEIBOLD WALTER ,  HOFFMANN MICHAEL ,  HASSELMANN WOLFGANG ,  MERGNER BERND ,  BIRTIGH GERHARD ,  SCHAEFER ROBERT ,  DITTRICH EWALD ,  FOERSTER MARTIN

IPC: B01D53/86 ,  B01J35/04 ,  B01J37/02 ,  B05D7/22 ,  B28B11/04 ,  C04B41/45 ,  F01N3/28

Abstract: A process for the coating of the flow channels of a cylindrical, honeycomb form catalyst carrier with a dispersion coating through filling of the vertically oriented flow channels with a fill quantity of the coating dispersion through the bottom face of the catalyst carrier and subsequent downward emptying and clearance extraction of the flow channels, as well as drying and calcination of the catalyst carrier, by the following steps: a) filling of the flow channels with a fill quantity that is about 10% greater than the empty volume of the flow channels, so that the coating dispersion goes over the upper face of the catalyst carrier after completion of the filling cycle, b) removal of the excess coating dispersion at the top before emptying of the flow channels and c) emptying and clearance extraction of the flow channels through an extraction impulse, which is generated by connection of a vacuum tank with the bottom face of the catalyst carrier, whereby the time between the beginning of the fill cycle and the end of the emptying and clearance extraction amounts to no more than 5 seconds.

公开(公告)号：ZA91899B

公开(公告)日：1991-11-27

申请号：ZA91899

申请日：1991-02-06

Applicant: DEGUSSA

Inventor： BRAND REINHOLD ,  REINHOLD BRAND ,  FOERSTER MARTIN ,  MARTIN FOERSTER ,  KLEINSCHMIT PETER ,  PETER KLEINSCHMIT ,  OHMER JOHANNES ,  JOHANNES OHMER ,  ENGLER BERND ,  BERND ENGLER ,  HARTMANN WERNER ,  WERNER HARTMANN ,  KOBERSTEIN EDGAR ,  EDGAR KOBERSTEIN ,  SCHWARZ RUDOLF ,  RUDOLF SCHWARZ

IPC: B01J21/06 ,  B01J35/10 ,  B01J37/00 ,  B28B3/20 ,  C04B35/46 ,  C01G ,  B01J ,  C04B

Abstract: Pressed titanium dioxide is produced by intensively mixing pyrogenically prepared titanium dioxide in the presence of deionised water with a humectant and/or a base and/or, if appropriate, a binder and/or, if appropriate, a forming aid and/or, if appropriate, a pore former, extruding the resulting mass at pressures of between 5 and 100 bar to give mouldings, drying the mouldings at temperatures between 50 and 120 DEG C and then calcining them for 1 to 5 hours in ambient air at temperatures from 400 to 700 DEG C.

公开(公告)号：CA2265071C

公开(公告)日：2004-11-16

申请号：CA2265071

申请日：1999-03-09

Applicant: DEGUSSA

Inventor： DITTRICH EWALD ,  HASSELMANN WOLFGANG ,  LEIBOLD WALTER ,  SCHAFER ROBERT ,  BIRTIGH GERHARD ,  MERGNER BERND ,  FOERSTER MARTIN ,  HOFFMANN MICHAEL

IPC: B01D53/86 ,  B01J35/04 ,  B01J37/02 ,  B05D7/22 ,  B28B11/04 ,  C04B41/45 ,  F01N3/28

Abstract: A process for the coating of the flow channels of a cylindrical, honeycomb form catalyst carrier with a dispersion coating through filling of the vertically oriented flow channels with a fill quantity of the coating dispersion through the bottom face of the catalyst carrier and subsequent downward emptying and clearance extraction of the flow channels, as well as drying and calcination of the catalyst carrier, by the following steps: a) filling of the flow channels with a fill quantity that is about 10% greater than the empty volume of the flow channels, so that the coating dispersion goes over the upper face of the catalyst carrier after completion of the filling cycle, b) removal of the excess coating dispersion at the top before emptying of the flow channels and c) emptying and clearance extraction of the flow channels through an extraction impulse, which is generated by connection of a vacuum tank with the bottom face of the catalyst carrier, whereby the time between the beginning of the fill cycle and the end of the emptying and clearance extraction amounts to no more than 5 seconds.

公开(公告)号：DE19909029A1

公开(公告)日：2000-09-21

申请号：DE19909029

申请日：1999-03-02

Applicant: DEGUSSA

Inventor： FOERSTER MARTIN ,  HOHENTHANNER CLAUS-RUPERT ,  HARRIS MICHAEL ,  GIESHOFF JUERGEN

IPC: B01D53/94 ,  B01J37/02 ,  B01J37/08 ,  B01J37/16

Abstract: Production of a catalytically active layer on a monolithic support uses a coating dispersion or an impregnated solution with precursor compounds of catalytically active or promoting components, in which the monolithic support has flow paths for gases from an inlet front surface to an outlet front surface. The flow paths are filled with the coating dispersion or with the impregnated solution, dried by heating the body, and calcined to convert the precursor compounds into catalytically active or promoting components, which are then reduced.

公开(公告)号：MX9907580A

公开(公告)日：2000-08-01

申请号：MX9907580

申请日：1999-08-17

Applicant: DEGUSSA

Inventor： FOERSTER MARTIN ,  PIROTH JOSEF ,  SCHLACHTER ULRICH ,  DOMESLE RAINER ,  KRAMPE WILLI

IPC: B05D7/24 ,  B01J37/02 ,  F01N3/10

Abstract: The coating dispersion is sucked through the flow channels of a monolithic catalyst support at a rate of 0.1-1 m/s. Excess dispersion is removed from the channels by applying a suction impulse from below. Extraction air is sucked at a rate of 40-1 m/s through the channels and the excess coating dispersion removed from the air stream is removed from the air stream within a time from less than 100 ms after leaving the catalyst support. Process for coating the flow channels of a monolithic cylindrical catalyst support with a coating dispersion comprises vertically directing the cylindrical axis, charging a predetermined amount of dispersion from a storage vessel to the upper front surface of the support, sucking the dispersion through the flow channels, removing excess dispersion from the channels, returning the excess dispersion to the storage vessel and fixing the dispersion by calcining. The coating dispersion is sucked through the flow channels of a monolithic catalyst support at a rate of 0.1-1 m/s. Excess dispersion is removed from the channels by applying a suction impulse from below. Extraction air is sucked at a rate of 40-1 m/s through the channels and the excess coating dispersion removed from the air stream is removed from the air stream within a time from less than 100 ms after leaving the catalyst support.

公开(公告)号：AU4455499A

公开(公告)日：2000-03-09

申请号：AU4455499

申请日：1999-08-18

Applicant: DEGUSSA

Inventor： FOERSTER MARTIN ,  KRAMPE WILLI ,  DOMESLE RAINER ,  SCHLACHTER ULRICH ,  PIROTH JOSEF

IPC: B05D7/24 ,  B01J37/02 ,  F01N3/10 ,  B01J37/00

Abstract: The coating dispersion is sucked through the flow channels of a monolithic catalyst support at a rate of 0.1-1 m/s. Excess dispersion is removed from the channels by applying a suction impulse from below. Extraction air is sucked at a rate of 40-1 m/s through the channels and the excess coating dispersion removed from the air stream is removed from the air stream within a time from less than 100 ms after leaving the catalyst support. Process for coating the flow channels of a monolithic cylindrical catalyst support with a coating dispersion comprises vertically directing the cylindrical axis, charging a predetermined amount of dispersion from a storage vessel to the upper front surface of the support, sucking the dispersion through the flow channels, removing excess dispersion from the channels, returning the excess dispersion to the storage vessel and fixing the dispersion by calcining. The coating dispersion is sucked through the flow channels of a monolithic catalyst support at a rate of 0.1-1 m/s. Excess dispersion is removed from the channels by applying a suction impulse from below. Extraction air is sucked at a rate of 40-1 m/s through the channels and the excess coating dispersion removed from the air stream is removed from the air stream within a time from less than 100 ms after leaving the catalyst support.

公开(公告)号：DE19837731A1

公开(公告)日：2000-02-24

申请号：DE19837731

申请日：1998-08-20

Applicant: DEGUSSA

Inventor： FOERSTER MARTIN ,  PIROTH JOSEF ,  SCHLACHTER ULRICH ,  DOMESLE RAINER ,  KRAMPE WILLI

IPC: B05D7/24 ,  B01J37/02 ,  F01N3/10 ,  B01J23/38

Abstract: The coating dispersion is sucked through the flow channels of a monolithic catalyst support at a rate of 0.1-1 m/s. Excess dispersion is removed from the channels by applying a suction impulse from below. Extraction air is sucked at a rate of 40-1 m/s through the channels and the excess coating dispersion removed from the air stream is removed from the air stream within a time from less than 100 ms after leaving the catalyst support. Process for coating the flow channels of a monolithic cylindrical catalyst support with a coating dispersion comprises vertically directing the cylindrical axis, charging a predetermined amount of dispersion from a storage vessel to the upper front surface of the support, sucking the dispersion through the flow channels, removing excess dispersion from the channels, returning the excess dispersion to the storage vessel and fixing the dispersion by calcining. The coating dispersion is sucked through the flow channels of a monolithic catalyst support at a rate of 0.1-1 m/s. Excess dispersion is removed from the channels by applying a suction impulse from below. Extraction air is sucked at a rate of 40-1 m/s through the channels and the excess coating dispersion removed from the air stream is removed from the air stream within a time from less than 100 ms after leaving the catalyst support.

公开(公告)号：CA2280597A1

公开(公告)日：2000-02-20

申请号：CA2280597

申请日：1999-08-19

Applicant: DEGUSSA

Inventor： PIROTH JOSEF ,  SCHLACHTER ULRICH ,  KRAMPE WILLI ,  DOMESLE RAINER ,  FOERSTER MARTIN

IPC: B05D7/24 ,  B01J37/02 ,  F01N3/10

Abstract: The invention relates to a process for coating the flow channels in a monolithic, cylindrically shaped catalyst carrier with a coating dispersion, wherein the carrier has two end faces which are connected to each other by flow channels arranged parallel to the axis of the cylinder, by vertically aligning the axis of the cylindrical carrier, placing a predetermined amount of coating dispersion from a storage container on the upper end face of the carrier and drawing the dispersion through the flow channels under suction, removing excess coating dispersion from the flow channels by emptying the flow channels under suction, returning the excess dispersion to the storage container and fixing the dispersion coating by calcination. The process is characterised in that the coating dispersion is drawn through the flow channels under suction at a rate of flow of 0.1 to 1 m/s and that after completion of passage under suction the excess coating dispersion is removed from the flow channels by applying a suction impulse from below, wherein the suction air is drawn through the flow channels under suction at a rate of flow between 40 and 1 m/s and the excess coating dispersion discharged with the air stream is separated from the air stream within a time of less than 100 ms after discharge from the catalyst carrier.