US3617038A - Apparatus for the continuous dehydration of aluminum fluoride hydrates - Google Patents

Apparatus for the continuous dehydration of aluminum fluoride hydrates Download PDF

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Publication number
US3617038A
US3617038A US877772A US3617038DA US3617038A US 3617038 A US3617038 A US 3617038A US 877772 A US877772 A US 877772A US 3617038D A US3617038D A US 3617038DA US 3617038 A US3617038 A US 3617038A
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United States
Prior art keywords
jacket
furnace
gas
tube
product
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Expired - Lifetime
Application number
US877772A
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English (en)
Inventor
Alfred Schmidt
Ferdinand Weinrotter
Roland Glotzl
Rudolf Staudigl
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Patheon Austria GmbH and Co KG
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Chemie Linz AG
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Publication date
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/48—Halides, with or without other cations besides aluminium
    • C01F7/50—Fluorides

Definitions

  • I'NVENTORS ALFRED SCHMIDT FERDINAND WEINROTTER ROLAND GLC'DTZL RUDOLF STAUDIGL BY Wm MWZW ATTORNEYS APPARATUS FOR THE CONTINUOUS DEIIYDRATION F ALUMINUM FLUORIDE IIYDRATES
  • This invention relates to an apparatus for the continuous dehydration of aluminum fluoride hydrates.
  • the calcination of moist aluminum fluoride hydrate requires an amount of heat of about 1,150 Kcal. per kilogram of final product. Since the requisite final temperature during the calcination is about 600 C. it is necessary for the walls, which after all are intended to transfer the heat to the fluidized bed particles, to be at a temperature of 650 to 800 C.
  • a device for the calcination of aluminum fluoride has to meet the requirement of accommodating the requisite heating surface while the volume is as small as possible and hence the residence time of the product is short, and has to take into account the properties of the available materials.
  • Jacket radiant tubes have become known in the metal industry for heat treatment furnaces, for example, flow-through furnaces, that is to say for heating the atmosphere of the furnace.
  • a jacket radiant tube consists of a tube closed at one end, inside which a second tube is arranged concentrically in such a way that an annular space is formed between the two tubes.
  • the burner provided in the interior of the inner tube is so constructed that it simultaneously serves as a recuperator, and the combustion gases are led in such a way that their direction is changed through 180 at the end of the inner tube and that they flow back in the annular space, flush round the recuperator burner and hence prewarm the air used for combustion.
  • the temperature remains practically constant over the length of the tube because nowhere does a directly heated surface serve as an outer wall; rather, the outer wall is internally flushed by the combustion gases.
  • jacket radiant tubes are particularly suitable for the rapid and uniform heating of fluidized beds to a very high temperature, as is required for the successful calcination of aluminum fluoride hydrates.
  • an apparatus for the continuous dehydration of aluminum fluoride hydrates which comprises one or more fluidized bed furnaces, the furnaces being arranged in series when there are more than one, each individual furnace consisting of a cylindrical furnace jacket which is provided, just above the base, with a porous perforated plate or sintered plate, and has a furnace lid to which gas-heated jacket radiant tubes are fixed which project vertically into the interior of the furnace and reach almost to the perforated or porous sintered plate, each of the radiant tubes being closed at one end and having arranged in the interior a concentric inner tube which is open at the bottom and is of almost the same length as the jacket radiant tube, so that an annular space is formed between the two tubes through which combustion gas issuing from a burner arranged in the interior of the concentric inner tube flows upwards after a change of direction of in the tip of the outer tube, so that both the fluidized bed located outside the jacket radiant tube and also, via a recuperator, the air passed to the burner are warmed.
  • a particularly preferred apparatus is one in which there are several jacket radiant tubes which are of the same diameter and are spaced equally from one another and are arranged in the furnace in one or more circles concentric with the furnace jacket. A uniform distribution of heat in the fluidized bed is thereby achieved.
  • FIG. 1 and FIG. 2 schematically illustrate a particularly preferred embodiment of the apparatus according to the invention.
  • FIG. 1 represents the elevation and FIG. 2 the corresponding plan view.
  • each individual fluidized bed furnace essentially consists of a cylindrical furnace jacket 1.
  • the fluidized bed furnace is closed at the top by a flat lid 2 with apertures for the product inlet tube 6, for one or more jacket radiant tubes 5 and for a gas outlet tube 7.
  • the apparatus includes an inlet tube 13 for the heating gas, an inlet tube 12 for the combustion air, and a gas discharge pipeline 14 for the combustion gas.
  • the jacket radiant tube 5, has a burner 11 which is surrounded by a recuperator 15. The direction of the combustion gases is changed through 180 at the end of the inner tube 16, and the combustion gases flow back in the direction of the arrow and flush round the recuperator.
  • three or four jacket radiant tubes 5 are arranged in a circle which is concentric with the furnace jacket.
  • the furnace is closed at the bottom by a base 3 in which is set a perforated or porous sintered plate 4.
  • the blowing gas enters at 9.
  • Screening sheet 10 is a gastight sheet, preferably of metal, positioned to channel only that product which has reached the bottom of the furnace. Therefore, as will be apparent from the drawings, only that product which has undergone the entire process may be discharged.
  • the blowing gas which flows in through the porous sintered plate 4 is used to create a fluidized bed of anhydrous aluminum fluoride in the apparatus according to the invention, this bed being kept at a temperature of 580 to 600 C. with the aid of the jacket radiant tubes 5 if the calcination is being carried out in a single fluidized bed furnace.
  • the moist aluminum fluoride hydrate is introduced into the furnace from above through the product inlet tube 6 built into the lid 2 and reaches the desired final temperature extremely rapidly because, as a result of being introduced from above, it immediately comes into contact with the hot fluidized bed and with the jacket radiant tubes.
  • the product outlet tube 8 is so screened by the screening sheet 10 that only products which were already in the lowest part of the fluidized bed can be expelled. If a battery of, for example, two fluidized bed furnaces are employed for the dehydration, it is advisable to carry out the dehydration in two stages, with the first fluidized bed furnace for example being kept at about 220 C., corresponding to a partial dehydration of the trihydrate with the release of 2.5 moles of water, and only the second furnace being kept at 580 to 600 C., the temperature for complete dehydration. in both furnaces the product is brought to the desired temperature within a few seconds. The product outlet tube 8 of the first furnace is then connected to the product inlet tube 6 of the second furnace.
  • An apparatus for the continuous dehydration of aluminum fluoride hydrates comprising a fluidized bed furnace consisting of a cylindrical furnace jacket having a base; a gas-permeable plate positioned within said jacket immediately above said base, a fluidized bed adapted to be positioned within said jacket above said base; a furnace lid over the top of said jacket; at least one gas-heated jacket radiant tube extending through said lid and projecting vertically downwardly into the interior of said furnace and reaching almost to said gaspermeable plate; each of said gas-heated jacket radiant tubes consisting of an outer tube closed at the lower end near said gas-permeable plate, an inner tube concentrically arranged within said outer tube, the upper part of said inner tube being constructed to serve as a recuperator, said inner tube being open at the lower end thereof and reaching almost the closed end of said outer tube, and a burner positioned within said inner tube, whereby an annular space is formed between said outer tube and said inner tube; a source of heating gas connected to said burner; a source of combustion air connected to the interior
  • said apparatus comprises a plurality of said fluidized-bed furnaces, each of said furnaces having a product inlet and a product outlet, said plurality of furnaces being serially connected such that the product outlet of a first of said furnaces is connected to the product inlet of a second of said furnaces.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
US877772A 1968-11-18 1969-11-18 Apparatus for the continuous dehydration of aluminum fluoride hydrates Expired - Lifetime US3617038A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT1117368A AT285533B (de) 1968-11-18 1968-11-18 Vorrichtung zur kontinuierlichen Entwässerung von Aluminiumfluoridhydraten

Publications (1)

Publication Number Publication Date
US3617038A true US3617038A (en) 1971-11-02

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US877772A Expired - Lifetime US3617038A (en) 1968-11-18 1969-11-18 Apparatus for the continuous dehydration of aluminum fluoride hydrates

Country Status (8)

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US (1) US3617038A (de)
AT (1) AT285533B (de)
BE (1) BE741810A (de)
FR (1) FR2023503A1 (de)
GB (1) GB1236506A (de)
NL (1) NL6915748A (de)
RO (1) RO56586A (de)
ZA (1) ZA697855B (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855993A (en) * 1973-03-17 1974-12-24 Ipsen Ind Int Gmbh Radiating tube burner
US3973884A (en) * 1974-10-23 1976-08-10 Basf Wyandotte Corporation Manufacture of high-density foamed polymer
US4585051A (en) * 1983-05-13 1986-04-29 University Of Queensland Heat exchange between solids
US20100308985A1 (en) * 2007-09-20 2010-12-09 Magna Steyr Fahrzeugtechnik Ag & Co. Kg Spacer lamp in passenger and/or goods traffic
CN105540629A (zh) * 2016-01-22 2016-05-04 峨眉山长庆化工新材料有限公司 无水三氯化铝沸腾式连续升华装置
US20180135854A1 (en) * 2015-06-05 2018-05-17 E.T.I.A. - Evaluation Technologique, Ingenierie Et Applications Cracking furnace

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IE49127B1 (en) * 1979-01-08 1985-08-07 Bpb Industries Ltd Calcination method and apparatus
CN108840358B (zh) * 2018-09-13 2023-07-18 衢州市鼎盛化工科技有限公司 一种制备无水氟化铝的装置及其方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2953365A (en) * 1956-12-17 1960-09-20 Jr Frank J Mcentee Process and apparatus for continuous calcination of gypsum and the like
GB911837A (en) * 1960-02-18 1962-11-28 Chemie Linz Ag Improvements in or relating to the dehydration of aluminium fluoride hydrates
US3264751A (en) * 1960-07-11 1966-08-09 Frank J Mcentee Jr Heat-exchange method and apparatus
US3285240A (en) * 1963-07-10 1966-11-15 Indugas Ges Fur Ind Gasverwend Industrial gas burner
US3495654A (en) * 1966-01-19 1970-02-17 Heurtey Sa Device for setting in motion powdery materials forming a fluidized bed

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2953365A (en) * 1956-12-17 1960-09-20 Jr Frank J Mcentee Process and apparatus for continuous calcination of gypsum and the like
GB911837A (en) * 1960-02-18 1962-11-28 Chemie Linz Ag Improvements in or relating to the dehydration of aluminium fluoride hydrates
US3264751A (en) * 1960-07-11 1966-08-09 Frank J Mcentee Jr Heat-exchange method and apparatus
US3285240A (en) * 1963-07-10 1966-11-15 Indugas Ges Fur Ind Gasverwend Industrial gas burner
US3495654A (en) * 1966-01-19 1970-02-17 Heurtey Sa Device for setting in motion powdery materials forming a fluidized bed

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855993A (en) * 1973-03-17 1974-12-24 Ipsen Ind Int Gmbh Radiating tube burner
US3973884A (en) * 1974-10-23 1976-08-10 Basf Wyandotte Corporation Manufacture of high-density foamed polymer
US4585051A (en) * 1983-05-13 1986-04-29 University Of Queensland Heat exchange between solids
US20100308985A1 (en) * 2007-09-20 2010-12-09 Magna Steyr Fahrzeugtechnik Ag & Co. Kg Spacer lamp in passenger and/or goods traffic
US8400286B2 (en) * 2007-09-20 2013-03-19 Magna Steyr Fahrzeugtechnik Ag & Co. Kg Spacer lamp in passenger and/or goods traffic
US20180135854A1 (en) * 2015-06-05 2018-05-17 E.T.I.A. - Evaluation Technologique, Ingenierie Et Applications Cracking furnace
US10670264B2 (en) * 2015-06-05 2020-06-02 E.T.I.A.—Evaluation Technologique, Ingenierie et Applications Cracking furnace
CN105540629A (zh) * 2016-01-22 2016-05-04 峨眉山长庆化工新材料有限公司 无水三氯化铝沸腾式连续升华装置
CN105540629B (zh) * 2016-01-22 2017-12-22 峨眉山长庆新材料有限公司 无水三氯化铝沸腾式连续升华装置

Also Published As

Publication number Publication date
RO56586A (de) 1974-06-01
BE741810A (de) 1970-05-19
GB1236506A (en) 1971-06-23
NL6915748A (de) 1970-05-20
ZA697855B (en) 1971-06-30
AT285533B (de) 1970-10-27
FR2023503A1 (de) 1970-08-21

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