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WO1986003479A1 - Garnitures de captage - Google Patents

Garnitures de captage Download PDF

Info

Publication number
WO1986003479A1
WO1986003479A1 PCT/GB1984/000428 GB8400428W WO8603479A1 WO 1986003479 A1 WO1986003479 A1 WO 1986003479A1 GB 8400428 W GB8400428 W GB 8400428W WO 8603479 A1 WO8603479 A1 WO 8603479A1
Authority
WO
WIPO (PCT)
Prior art keywords
pack
segments
catchment
catchment pack
wire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB1984/000428
Other languages
English (en)
Inventor
David Cyril Bishop
Alan Edward Heywood
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Johnson Matthey PLC
Original Assignee
Johnson Matthey PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB838307086A external-priority patent/GB8307086D0/en
Application filed by Johnson Matthey PLC filed Critical Johnson Matthey PLC
Priority to BR8407375A priority Critical patent/BR8407375A/pt
Priority to PCT/GB1984/000428 priority patent/WO1986003479A1/fr
Priority to JP60500263A priority patent/JPS62501411A/ja
Priority to EP85900154A priority patent/EP0204696A1/fr
Publication of WO1986003479A1 publication Critical patent/WO1986003479A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
    • C01B21/24—Nitric oxide (NO)
    • C01B21/26—Preparation by catalytic or non-catalytic oxidation of ammonia
    • C01B21/267—Means for preventing deterioration or loss of catalyst or for recovering lost catalyst
    • 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
    • B01J12/00—Chemical processes in general for reacting gaseous media with gaseous media; Apparatus specially adapted therefor
    • B01J12/007—Chemical processes in general for reacting gaseous media with gaseous media; Apparatus specially adapted therefor in the presence of catalytically active bodies, e.g. porous plates
    • 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
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/58—Fabrics or filaments

Definitions

  • This invention relates to a catchment pack containing layers of material such as are typically used as catalyst catchment or getter means in nitric acid production plants.
  • nitric acid In the industrial production of nitric acid, it is common practice first to prepare nitric oxide by passing a mixture of ammonia and air at elevated temperature through an oxidation catalyst comprising one or more gauzes woven from wire comprising an alloy of platinum and rhodium.
  • platinum and, to a lesser extent, rhodium are themselves converted to their oxides when are volatile at the plant operating temperatures obtaining and are, in consequence, carried away in the nitric oxide stream to be eventually deposited on cooler parts of the plant downstream of the catalyst or lost altogether to atmosphere.
  • gauze packs In order to reduce these losses of platinum and rhodium to an acceptable leve catchment gauze packs have been developed for insertion in the catalytic reactor immediately downstream of the catalytic gauze or gauzes.
  • such packs consist of interleaved gauzes woven from, respectively, a getter material and a support material.
  • a suitable and commonly-used getter material is an alloy of palladium and gold, for example 20% gold-palladium
  • a suitable support material is an oxidation-resistant stainless steel such gg Megapyr 2 (Registered Trade Mark).
  • FIG. X A sectional view of a typical ammonia oxidation reactor is shown in Figure X of the accompanying drawings.
  • the catalytic platinum-rhodium gauzes are shown at 1 supported on a catchment pack 2 of interleaved stainless steel support and gold/palladium getter gauzes.
  • the entire catalyst/catchment gauze assembly is clamped together with a gasket 3 between reactor flanges 4.
  • Heavy support bars 5 are provided across the area of the reactor.
  • FIG Y of the accompanying drawings shows a detail of an alternative means of assembling and supporting a catchment gauze pack in which the gauzes are slightly smaller in diameter than the reactor, thus allowing a peripheral expansion space 6, and are supported on a coarse gauze 7 fabricated from, for example, "Iconel" (Trade Mark) steel itself supported on the heavy support bars. Additionally, in this arrangement, the uppermost stainless steel gauze is oversize relative to the remaind ⁇ er of the getter and support gauzes and is folded over peripherally and beneath the said remainder of the gauzes at 8 so that the entire catchment gauze pack may then be handled as a unit.
  • the uppermost stainless steel gauze is oversize relative to the remaind ⁇ er of the getter and support gauzes and is folded over peripherally and beneath the said remainder of the gauzes at 8 so that the entire catchment gauze pack may then be handled as a unit.
  • the getter material is capable of retaining its gettering activity over a period amounting to twice or more times the useful lifetime of the cataly ⁇ tic gauzes,(known in the art as a "campaign"), in use the getter material suffers embrittlement leading to failure of the gauze on movement which usually means in practice that it needs to he discarded early, that is, at the end of a campaign when the reactor is dismantled to renew the catalytic gauzes, or earlier if there is some other reason requiring the reactor to be dismantled.
  • catchment gauze pack suitable for such a large diameter reactor is a particularly heavy and bulky item to store in security, to transport and generally to handle.
  • an object of the invention to provide a catchment pack which is substantially rigid, is easy to store and transport and may readily be removed from and replaced in a catalytic reactor such as an ammonia oxidation reactor without failure of the getter material.
  • catchment packs may comprise a plurality of pack segments, for example sectors, which may be located in contiguous relationship one with another in a reactor to provide together in effect a catchment pack extending over substantially the entire surface area of the catalytic gauze.
  • a catch ⁇ ment pack segment suitable for use in an ammonia oxidation reactor and adapted to be located in planar edge-to-edge relationship with one or more further catchment pack segments to form a composite catchment pack having a predetermined geometric shape, the pack segment comprising support gauze segments interleaved with one or more pads of wire formed from a getter material.
  • a catchment pack segment comprising interleaving support gauze segments of a required shape with one or more pads of wire formed from a getter material and of a required shape, and securing the segments and the or each pad together.
  • This invention also includes a catchment pack when made from a plurality of segments according to the first or second aspects of the invention, wherein the predetermined shape is preferably regular.
  • the wire pad may be in the form of knitted wire or randomly oriented wire either of which can be compressed.
  • knitted wire is meant interlocked loops of wire. If the pad is in the form of knitted wire, this may be formed as a continuous tube, which can be slit longitudinally, and opened out to form a single knitted layer.
  • the weight of metal of a single such knitted layer can be in the range 50 to 1500 g/m 2 , preferably 150 to 1300 g/m 2 .
  • the catchment pack segment comprises at least two gauze segments made of a support material such as oxidation-resistant stainless steel, for example
  • one or more wire pads made of a getter material such as an alloy of palladium and gold, for example 20% gold-palladium, although other getter materials may be used, particularly less robust materials or materials which in use become less robust.
  • a getter material such as an alloy of palladium and gold, for example 20% gold-palladium, although other getter materials may be used, particularly less robust materials or materials which in use become less robust.
  • each pad is preferably of different gauge wire and of different voidage.
  • the upstream portion or portions of the catchment pack absorb relatively more of the platinum and rhodium and therefore need to be more robust; they also tend to swell more in use. Also, the downstream portion or portions should have
  • the diameter of the wire should be in the range 0.05mm to
  • the preferred range is from 0.06 to 0.25 mm for metal
  • ammonia oxidation reactor particularly using more than one pad
  • the upstream pad is formed from wire typically having a diameter in the range 150-250 microns and the downstream pad is formed from wire typically having a diameter in the range 50-100 microns Intermediate pads may be formed from wire typically having a diameter in the range 100 to 150 microns.
  • the thickness of each pad and of the total catchment pack is dependent upon the operating pressure and other parameters of the particular ammonia oxidation plant.
  • a pack segment according to the invention may have the form of a sector, for example a semi-circle or a quadrant, or another shape which, when located in planar contiguous relationship with one or more further pack segments (which further segment or segments may or may not have the same or similar shape to the first segment) provides a catchment pack having a predetermined, e.g. regular, geometric shape. It is normally preferred that the regular shape is circular, and other shapes may be used for example rectangular, square or polygonal, for example hexagonal.
  • a catchment pack segment according to the invention may be made by assembling or superposing segments of the required material and shape in the required order and securing them together to form a pack. Securing may be achieved for example by folding one or more marginal portions of an outermost support gauze over an edge of the assembly (in which case at least one support gauze segment should be oversize relative to the remainder to provide a suitable marginal portion), or by welding, riveting, tying with wire and the like.
  • Individual pack segments according to the invention may be located in planar contiguous relationship one with another to form a circular or other regular shaped arrangement for location in a catalyst reactor, although we have found that for many purposes it is convenient to hingeably connect the segments in such a way that they can themselves be folded for transportation and storage so that the entire catchment pack assumes the shape and area of the individual segments thereof.
  • individual segments may be temporarily held one with another in the reactor, hingeably or otherwise.
  • the folded pack is placed on the the support bars or other support means with the peripheral edge of the folded pack adjacent to the inner edge of the reactor body and the pack is unfolded so that individual catchment pack segments lie in planar contiguous relationship one with another to substantially cover (except for a peripheral expansion gap and small gaps between hinged edges of adjacent pack segments and the like) the dross-rseetional area of the reactor.
  • Figures 1 to 3 of the drawings show a perspective view of a catchment pack segment in the form of a quadrant, partly cut away to show a section through the pack;
  • Figures 2A to 2E show how four quadrants as shown in Figure 1 may be hingeably connected and folded; and, Figures 3A to 3 show various ways of assembling catchment pack segments to form catchment packs having a regular geometric shape.
  • a catchment pack segment 10 has the form of a quadrant. It consists of outermost support gauzes 11, 12 secured between which are three wire pads 13, 14 and 15 formed from knitted and compressed wire formed from a getter material such as palladium gold alloy. Pad 13 is formed from the heaviest gauge (200 microns) wire and is lightly compressed; pad 14 in turn is formed from lighter gauge (125 microns) wire and is relatively more compressed. Pad 15 is formed from the lightest gauge wire (75 microns) and is compressed the most.
  • the pads and support gauzes are secured together with staples
  • Pad 13 is the upstream pad when located in the reactor next to the catalyst gauzes.
  • One way of higeably connecting four catchment pack segments such as shown in Figure 1 is shown in Figures 2A to 2E.
  • Figures 2A to 2E One way of higeably connecting four catchment pack segments such as shown in Figure 1 is shown in Figures 2A to 2E.
  • FIGyre 2A four catchment pack segments SI, S2, S3 and S4 are shown hingeably connected at mutually adjacent edges SI and S2, SI and S4, and S3 and S4 of the segments respectively. Hingeable connection are shown at SS.
  • Figure 2B illustrates the first fold (i.e. segments SI and S2 together folded on segments S3 and S4) and
  • Figure 2C illustrates the second and third folds (i.e. segments
  • S3 and S2 are respectively folded back upon segments S4 and SI).
  • Figure 2D illustrates the resulting folded catchment pack segments
  • Figure 2E shows the pack segments unfolded to provide a catch ⁇ ment pack as located in, for example, a catalylst reactor.
  • the segments S2 and S3 can be held together, for example by stitc as shown in Figure 2E at SS (the original hingeable connections being omitted for the sake of clarity.
  • One pack segment according to the invention may be hingeably connected with another by any convenient method, for example by stitchi by use of hoops or by hoops and rods.
  • the material from which hoops or other hingeing means are made should obviously be capable of with ⁇ standing conditions obtaining in whatever use the catchment pack is to be put and should preferably be reasonably flexible for ease of folding and non-interference with, for example, adjacent catalyst gauze
  • hingeable connections may be made or broken, e.g. by inserting or removing a rod from a series of hoops, on site.
  • Catchment packs may have diameters of up to several metres and their provision in segments optionally hingeably connected together as above described saves a considerable amount of space during transportation from a manufacturer to the site, for example a nitric acid plant. Furthermore, in certain cases, transportation costs are calculated on the "girth" of the article and the invention results in a considerable reduction in girth.
  • a catchment pack consisting of segments according to the invention may be readily installed in a plant and may also be readily removed, either by removing individual pack segments or by folding segments if they are hingeably connected and removing the entire pack, without damaging the getter material. The removed pack may easily be handled, stored in security during plant mainten ⁇ ance and the like, or transported for the purpose of refining and platinum recovery.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Catalysts (AREA)
  • Information Transfer Systems (AREA)
  • Bus Control (AREA)

Abstract

Une garniture de captage indiquée pour être utilisée dans un réacteur d'oxydation d'ammoniac présente une forme géométrique prédéterminée et comprend deux ou plusieurs segments de garniture de captage (10) disposés à plat bord à bord, chacun de ces segments de garniture de captage (10) comprenant des segments de toile métallique de support (11, 12) entrelacés avec un ou plusieurs coussinets (13, 14, 15) de fil métallique composé d'un matériau getter, tel qu'un alliage de palladium-or.
PCT/GB1984/000428 1983-03-15 1984-12-11 Garnitures de captage Ceased WO1986003479A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BR8407375A BR8407375A (pt) 1983-03-15 1984-12-11 Segmento de pacote de retencao,processo para sua fabricacao,e pacote de retencao
PCT/GB1984/000428 WO1986003479A1 (fr) 1983-03-15 1984-12-11 Garnitures de captage
JP60500263A JPS62501411A (ja) 1983-03-15 1984-12-11 捕集パック
EP85900154A EP0204696A1 (fr) 1983-03-15 1984-12-11 Garnitures de captage

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB838307086A GB8307086D0 (en) 1979-05-03 1983-03-15 Laminar articles
GB08406363A GB2141042B (en) 1983-03-15 1984-03-12 Gauze/wire pad pack segments for catalytic reactor
PCT/GB1984/000428 WO1986003479A1 (fr) 1983-03-15 1984-12-11 Garnitures de captage

Publications (1)

Publication Number Publication Date
WO1986003479A1 true WO1986003479A1 (fr) 1986-06-19

Family

ID=26285515

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1984/000428 Ceased WO1986003479A1 (fr) 1983-03-15 1984-12-11 Garnitures de captage

Country Status (5)

Country Link
EP (1) EP0204696A1 (fr)
JP (1) JPS62501411A (fr)
BR (1) BR8407375A (fr)
GB (1) GB2141042B (fr)
WO (1) WO1986003479A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991008982A1 (fr) * 1989-12-13 1991-06-27 Norsk Hydro A.S Support de bloc catalyseur pour bruleur a oxydation d'ammoniaque
US5266293A (en) * 1988-10-12 1993-11-30 Johnson Matthey Public Limited Company Metal fabrics
WO1994015711A1 (fr) * 1993-01-06 1994-07-21 Pgp Industries, Inc. Piles de catalyseurs
RU2154020C1 (ru) * 1999-08-25 2000-08-10 Оао "Екатеринбургский Завод По Обработке Цветных Металлов" Устройство для улавливания платиноидов при каталитическом окислении аммиака
WO2004005187A1 (fr) * 2002-07-03 2004-01-15 Yara International Asa Procede et dispositif de maintien de gazes catalytiques dans un dans un bruleur d'oxydation par l'ammoniac
US6713478B2 (en) 1999-05-04 2004-03-30 Wyeth Cyclocarbamate derivatives as progesterone receptor modulators
RU2678681C1 (ru) * 2015-02-12 2019-01-30 ЮМИКОР АГ энд КО.КГ Катализаторная сетка и установка для каталитического окисления аммиака
CN111530114A (zh) * 2020-06-16 2020-08-14 上海化工研究院有限公司 精馏系统、半连续精馏方法和其用途
CN111659149A (zh) * 2020-06-16 2020-09-15 上海化工研究院有限公司 精馏塔、精馏系统及其用途

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2141042B (en) * 1983-03-15 1986-12-31 Johnson Matthey Plc Gauze/wire pad pack segments for catalytic reactor
GB8431364D0 (en) * 1984-12-12 1985-01-23 Johnson Matthey Plc Catchment packs
GB9302531D0 (en) * 1993-02-09 1993-03-24 Johnson Matthey Plc Improvements in pt recovery
GB2294419A (en) * 1994-10-24 1996-05-01 Pgp Ind Inc Handling foraminous sheets in industrial catalysis

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2050189A (en) * 1979-05-03 1981-01-07 Johnson Matthey Co Ltd Gauze/wire pack segments for catalytic reactors
GB2141042A (en) * 1983-03-15 1984-12-12 Johnson Matthey Plc Gauze/wire pad pack segments for catalytic reactor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2353640C3 (de) * 1973-10-26 1979-01-11 Uop Inc., Des Plaines, Ill. (V.St.A.) Katalysatorträger
GB1567593A (en) * 1976-10-20 1980-05-21 Matsushita Electric Industrial Co Ltd Exhaust gas control equipment
GB2064975B (en) * 1979-10-18 1984-03-14 Johnson Matthey Co Ltd Fibrous catalytic materials
JPS5939768B2 (ja) * 1980-10-01 1984-09-26 富士通株式会社 入出力システム
JPS5762438A (en) * 1980-10-03 1982-04-15 Toshiba Corp Control system for fifo memory
JPS57120144A (en) * 1981-01-16 1982-07-27 Toshiba Corp Data transfer system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2050189A (en) * 1979-05-03 1981-01-07 Johnson Matthey Co Ltd Gauze/wire pack segments for catalytic reactors
GB2141042A (en) * 1983-03-15 1984-12-12 Johnson Matthey Plc Gauze/wire pad pack segments for catalytic reactor

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5266293A (en) * 1988-10-12 1993-11-30 Johnson Matthey Public Limited Company Metal fabrics
WO1991008982A1 (fr) * 1989-12-13 1991-06-27 Norsk Hydro A.S Support de bloc catalyseur pour bruleur a oxydation d'ammoniaque
WO1994015711A1 (fr) * 1993-01-06 1994-07-21 Pgp Industries, Inc. Piles de catalyseurs
US6713478B2 (en) 1999-05-04 2004-03-30 Wyeth Cyclocarbamate derivatives as progesterone receptor modulators
RU2154020C1 (ru) * 1999-08-25 2000-08-10 Оао "Екатеринбургский Завод По Обработке Цветных Металлов" Устройство для улавливания платиноидов при каталитическом окислении аммиака
RU2284291C2 (ru) * 2002-07-03 2006-09-27 Яра Интернэшнл Аса Способ и устройство для поддерживания каталитических сеток в горелках для окисления аммиака
WO2004005187A1 (fr) * 2002-07-03 2004-01-15 Yara International Asa Procede et dispositif de maintien de gazes catalytiques dans un dans un bruleur d'oxydation par l'ammoniac
US7563419B2 (en) 2002-07-03 2009-07-21 Yara International Asa Method and device for supporting catalyst gauzes in an ammonia oxidation burner
RU2678681C1 (ru) * 2015-02-12 2019-01-30 ЮМИКОР АГ энд КО.КГ Катализаторная сетка и установка для каталитического окисления аммиака
US10258966B2 (en) 2015-02-12 2019-04-16 Umicore Ag & Co. Kg Catalyst gauze and installation for the catalytic oxidation of ammonia
CN111530114A (zh) * 2020-06-16 2020-08-14 上海化工研究院有限公司 精馏系统、半连续精馏方法和其用途
CN111659149A (zh) * 2020-06-16 2020-09-15 上海化工研究院有限公司 精馏塔、精馏系统及其用途
CN111659149B (zh) * 2020-06-16 2021-10-08 上海化工研究院有限公司 精馏塔、精馏系统及其用途

Also Published As

Publication number Publication date
GB2141042B (en) 1986-12-31
JPS62501411A (ja) 1987-06-11
EP0204696A1 (fr) 1986-12-17
GB2141042A (en) 1984-12-12
BR8407375A (pt) 1987-03-10
GB8406363D0 (en) 1984-04-18

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