WO1997025145A1 - Catalytically active coating with an auxiliary carrier and method of applying this coating - Google Patents
Catalytically active coating with an auxiliary carrier and method of applying this coating Download PDFInfo
- Publication number
- WO1997025145A1 WO1997025145A1 PCT/EP1997/000101 EP9700101W WO9725145A1 WO 1997025145 A1 WO1997025145 A1 WO 1997025145A1 EP 9700101 W EP9700101 W EP 9700101W WO 9725145 A1 WO9725145 A1 WO 9725145A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coating
- catalytically active
- auxiliary carrier
- base body
- catalyst
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
Definitions
- the invention relates to a catalytically active coating on a base body, in particular the inside of a reaction tube, and to a method for suspending a catalytically active coating.
- Catalysts are widely used in industrial technology. In petrochemistry, for example, catalysts are used in connection with the splitting of hydrocarbons or hydrocarbon mixtures.
- Splitting processes can be subject to different objectives.
- Steam cracking usually serves for the production of lower olefins, in particular of ethylene.
- other processes for splitting hydrocarbons, such as steam reforming are also known, which are generally used in connection with the production of synthesis gas.
- cracking furnaces with at least one convection and radiation zone are known to be used.
- the thermal splitting is carried out in the burner-heated radiation zone, while in the convection zone the hydrocarbons and other fluids are heated against flue gas by heat exchangers arranged there.
- hydrocarbons and process steam are preheated in the heat exchangers of the convection zone and a hydrocarbon / steam mixture is fed to the coils arranged in the radiation zone.
- the cracked gases are rapidly cooled in the downstream quench cooler to interrupt the reactions.
- Such methods and cracking furnaces are known for example from DE-OS 28 30 824 and DE-PS 28 54 061.
- Catalysts in cracking processes can promote the cracking reactions and / or the gasification of coke with water vapor after the water gas reaction in CO, CO2 and H2.
- thermocatalytic cleavage of higher-boiling hydrocarbons is known from the patent specification DD-243 708 A1.
- a gasification catalyst is used which is based on calcium aluminate and is doped with an alkali alanadate such as potassium pyrovanadate. Such a gasification catalyst and a method for its production is described in the German patent specification DD-243 647 A1.
- the canned pipes can, for example, be at least partially filled with a gasification catalyst for thermocatalytic cracking.
- a gasification catalyst for thermocatalytic cracking It has been shown that the catalyst fillings in the conventional reaction tube coils of pyrolysis furnaces or steam crackers have a number of disadvantages.
- the catalyst fillings in the reaction tubes increase the pressure loss of the individual reaction tube coils considerably.
- the dead weight of the catalyst-filled reaction tubes is significantly increased compared to unfilled reaction tubes, as a result of which the mechanical load increases.
- the high pressure drop in the reaction tubes in turn requires that the wall thickness of the reaction tubes has to be increased, which has a negative effect on the heat transfer affects.
- DE 44 00 430 A1 describes a process for the thermocatalytic splitting of higher-boiling hydrocarbons and a cracking furnace, the problems arising due to the catalyst fillings being taken into account by the use of straight reaction tubes without pipe elbows.
- catalysts should enable the best possible course of the catalytic reaction with a maximum reaction area. An optimal flow of the fluid should be ensured.
- catalytic coatings meet these requirements better than beds or the like.
- the invention is based on the object of demonstrating a method and a device of the type mentioned at the outset which avoid the disadvantages mentioned.
- the catalytically active coating can also be used under different temperature stresses.
- the coating on the base body preferably on a metallic base body, comprises at least the constituents of auxiliary supports and a cover layer which contains catalyst material and has a catalytic action.
- the invention is based on the idea of not applying the catalytically active cover layer directly to the base body, but rather of providing an auxiliary carrier.
- the auxiliary carrier preferably has an external shape which at least substantially corresponds to the geometry of the surface of the base body to be coated.
- the coating according to the invention can surprisingly effectively overcome the disadvantages of the known coatings in a simple manner.
- the auxiliary carrier generally comprises a body, which is preferably composed of metal, metal alloys and / or metal compounds. At least the auxiliary carrier and preferably also only the auxiliary carrier is advantageously coated with the catalytically active cover layer and the coated auxiliary carrier is arranged on the base body.
- the auxiliary carrier can be non-positively, frictionally and / or positively arranged on the base body.
- the auxiliary carrier consists of a wire, a wire mesh or a wire mesh.
- the auxiliary carrier preferably contains a highly heat-resistant heating conductor wire.
- a wire with a diameter between 0.1 and 2 mm, for example with 0.5 or 1 mm, can be used.
- the invention is not restricted to certain catalyst materials and catalyst compositions.
- coatings are suitable in which the catalytically active top layer contains oxide-ceramic catalyst material.
- the catalytically active top layer can advantageously have metal oxide hydroxide and / or metal oxide hydroxide-containing compounds and / or metal oxides and / or metal oxide-containing compounds which tend to form hydroxides.
- the catalytically active top layer can contain a catalyst based on calcium aluminate, preferably with a doping of alkali vanadate, in particular potassium pyrovanadate.
- the base body can at least partially consist of essentially unprocessed centrifugal casting surfaces of pipes. This means a simplified and cheaper production of the reaction tubes. The expensive, previously customary reworking of the pipe inner surfaces was necessary, for example, in the case of reaction pipes for splitting hydrocarbons, in order not to favor or even accelerate the caking of coke particles.
- the coating according to the invention is not only suitable for the inner surfaces of straight pipes, but it can also be provided, for example, as a coating for bent pipes, pipe elbows, pipe collectors and / or transferline pipes.
- a coating can be provided within the scope of the invention, an adhesion promoter being arranged on the auxiliary carrier and a cover layer containing catalyst material and catalytically active on this adhesion promoter.
- the adhesion promoter can increase the adhesion of the catalytically active cover layer on the auxiliary carrier.
- the service life can be extended if an adhesion promoter is used.
- a suspension containing a catalyst is applied to at least one auxiliary carrier, preferably a metallic auxiliary carrier.
- the catalytically active layer can first be applied to the auxiliary carrier and the auxiliary carrier provided with the catalytically active layer can be arranged on the base body or, for example in the case of a tubular base body, inserted into it.
- the insertion can in particular be carried out by means of a screw movement.
- the insertion also enables use with bent pipes, pipe elbows, pipe collectors and / or transferline pipes.
- welding seams can also be provided with a catalytic coating in this way.
- the catalytically active layer can be applied in the atmosphere or in the low-pressure range, as well as at room temperature or elevated temperatures.
- the catalytically active coating can be applied by sponging, brushing, spinning, spraying and / or dipping.
- a coating in which the suspension is stabilized by a binder or a binder system has proven particularly useful. Binders or binder systems are suitable which contain metal oxide hydroxide phosphates and / or metal salts and / or eutectic compounds which melt at the operating temperature of the catalyst.
- the suspension can also be stabilized in a substantially pH-neutral range by adding acids and / or bases. For this purpose, the suspension can advantageously be adjusted to a pH between 5 and 9, preferably between 6 and 8. Special results can be achieved with the method according to the invention if the suspension has a high solids content of up to 90% by weight, preferably 50 to 80% by weight, with a low viscosity.
- the base body can be roughened by blasting with a blasting medium, in particular corundum, in order to support the adhesion of the auxiliary carrier.
- a blasting medium in particular corundum
- the catalytic coating can be produced by applying a slip containing a catalyst and then drying and sintering the coating. Drying takes place, for example, in a convection oven at about 120 ° C and is then sintered in a protective gas oven at about 900 ° C for about 20 h.
- the slip is advantageously poured into pipes and spun at speeds between 100 and 1000 rpm, preferably between 300 and 800 rpm.
- the cast slip material presses itself into the roughness of the surface a, whereby air bubbles are prevented due to the high centrifugal force.
- the slip can also be sprayed on.
- An adhesion promoter can also be provided on the auxiliary carrier, on which the cover layer containing the catalytic material and having a catalytic action is applied.
- the catalyst coating according to the invention can be renewed in that the old catalytically active top layer of the coating is at least substantially removed and a new catalytically active coating is applied by means of sponges, brushes, spinning, spraying and / or dipping.
- the removal of the old catalytically active top layer of the coating can be removed in particular by sandblasting or the like. In this way, the catalyst material can be removed in a simple manner.
- the catalytically active coating and the method for application according to the invention are suitable for use on pipe, pipe elbow, pipe collector, transfer line pipe and / or wall or surface of apparatus, in particular ovens, reactors or the like, wherein these at least partially have a coating according to the invention.
- the catalytically active coating and the method for application according to the invention can be used in particular in connection with the splitting of hydrocarbons or hydrocarbon mixtures.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Catalysts (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU13115/97A AU1311597A (en) | 1996-01-10 | 1997-01-10 | Catalytically active coating with an auxiliary carrier and method of applying this coating |
EP97900592A EP0920355A1 (en) | 1996-01-10 | 1997-01-10 | Catalytically active coating with an auxiliary carrier and method of applying this coating |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19600685.6 | 1996-01-10 | ||
DE1996100685 DE19600685C2 (en) | 1996-01-10 | 1996-01-10 | Catalytic coating, process for its production and its use |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997025145A1 true WO1997025145A1 (en) | 1997-07-17 |
Family
ID=7782467
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/000101 WO1997025145A1 (en) | 1996-01-10 | 1997-01-10 | Catalytically active coating with an auxiliary carrier and method of applying this coating |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0920355A1 (en) |
AU (1) | AU1311597A (en) |
DE (1) | DE19600685C2 (en) |
WO (1) | WO1997025145A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040188323A1 (en) * | 2003-03-24 | 2004-09-30 | Tzatzov Konstantin K. | Active coating system for reducing or eliminating coke build-up during petrochemical processes |
DE10332995A1 (en) * | 2003-07-18 | 2005-03-03 | Rhodius Gmbh | Catalyst substrate and process for its preparation |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2304351A1 (en) * | 1973-01-30 | 1974-08-01 | Kali Chemie Ag | Catalyst-coated metal structures for exhaust gas purifcn. |
EP0429994A1 (en) * | 1989-11-17 | 1991-06-05 | Matsushita Electric Industrial Co., Ltd. | A catalytic composite and a cooker having the same |
DE4234931A1 (en) * | 1992-10-16 | 1994-04-21 | Schwaebische Huettenwerke Gmbh | Catalytic converter for automotive and other fossil fuel applications - has roughened gas passage surfaces to disrupt laminar gas flow and maximising gas contact with catalytic material |
EP0633065A1 (en) * | 1993-06-28 | 1995-01-11 | MANNESMANN Aktiengesellschaft | Process for the cleaning of exhaust air containing noxious substances by heterogeneous catalysis |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6043175B2 (en) * | 1977-10-12 | 1985-09-26 | 株式会社日立製作所 | Manufacturing method of metal catalyst |
-
1996
- 1996-01-10 DE DE1996100685 patent/DE19600685C2/en not_active Expired - Fee Related
-
1997
- 1997-01-10 WO PCT/EP1997/000101 patent/WO1997025145A1/en not_active Application Discontinuation
- 1997-01-10 EP EP97900592A patent/EP0920355A1/en not_active Withdrawn
- 1997-01-10 AU AU13115/97A patent/AU1311597A/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2304351A1 (en) * | 1973-01-30 | 1974-08-01 | Kali Chemie Ag | Catalyst-coated metal structures for exhaust gas purifcn. |
EP0429994A1 (en) * | 1989-11-17 | 1991-06-05 | Matsushita Electric Industrial Co., Ltd. | A catalytic composite and a cooker having the same |
DE4234931A1 (en) * | 1992-10-16 | 1994-04-21 | Schwaebische Huettenwerke Gmbh | Catalytic converter for automotive and other fossil fuel applications - has roughened gas passage surfaces to disrupt laminar gas flow and maximising gas contact with catalytic material |
EP0633065A1 (en) * | 1993-06-28 | 1995-01-11 | MANNESMANN Aktiengesellschaft | Process for the cleaning of exhaust air containing noxious substances by heterogeneous catalysis |
Also Published As
Publication number | Publication date |
---|---|
AU1311597A (en) | 1997-08-01 |
DE19600685A1 (en) | 1997-07-17 |
EP0920355A1 (en) | 1999-06-09 |
DE19600685C2 (en) | 1999-01-14 |
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