US2570612A - Method and apparatus for removing the crusts of the cooling elements of a continuously operating crystallizer - Google Patents

Method and apparatus for removing the crusts of the cooling elements of a continuously operating crystallizer Download PDF

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Publication number
US2570612A
US2570612A US30394A US3039448A US2570612A US 2570612 A US2570612 A US 2570612A US 30394 A US30394 A US 30394A US 3039448 A US3039448 A US 3039448A US 2570612 A US2570612 A US 2570612A
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United States
Prior art keywords
cooling elements
crusts
continuously operating
crystallizing
container
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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.)
Expired - Lifetime
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US30394A
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English (en)
Inventor
Vahl Laszlo
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.)
Werkspoor NV
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Werkspoor NV
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0004—Crystallisation cooling by heat exchange
    • B01D9/0013—Crystallisation cooling by heat exchange by indirect heat exchange
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/005—Selection of auxiliary, e.g. for control of crystallisation nuclei, of crystal growth, of adherence to walls; Arrangements for introduction thereof

Definitions

  • the invention has for its object to remove the drawbacks of said known methods and to deal with the formation of crusts or scale on the cooling elements of continuously operating crystallizers in simple manner.
  • the crust is periodically molten by'heating means operating on the outer surface of the cooling elements in such a manner that the molten mass flows back into the crystallizing mass.
  • the crystals preferably should have a melting point less than 100 centigrade.
  • the heating means for melting the crusts on the discs may be formed as heated scrapers which are periodically brought to their operative position relative to the discs.
  • the heating means may also direct jets of hot air or steam on the.
  • the drawing illustrates an embodiment of a device according to the invention as applied to a crystallizing apparatus of the kind described in Patent 1,868,406.
  • Fig. 1 is a cross section of the crystallization trough and Fig. 2 shows a plan view of a cooling disc and the cooperating heating element formed as a scraper.
  • a rotary hollow shaft 2 is mounted on which sector-shaped cooling discs 3 are secured.
  • a heating element 4 is adapted to cooperate which from time to time is brought into its operative position shown in full lines in Fig. 1.
  • the element 4 which is formed as a scraper is hollow and is heated e. g. by an electric resistance 5 or by steam.
  • the element 4 is normally held in its inoperative position as shown in dotted lines in Fig. 1 and to this end the element l is secured to a shaft 6 in order to be swung by means of lever 1.
  • the heating elements may be actuated automatically or manually.
  • the element 4 Whenever the crusts on the cooling discs have grown too thick the element 4 is brought into its operative position and thus acts on the surface of the disc portion extending above the level of the crystallizing mass in order to melt the crusts thereon. During said operation the rotary speed of the discs is preferably reduced. The molten mass flows back into the trough.
  • the solution to be crystallized may be fed to the surface of the cooling elements whereby the melting and removing of the crusts is facilitated.
  • a continuously operable crystallization apparatus comprising a container for crystallizing liquid, a plurality of hollow disc-like cooling elements journalled in said container on a substantially horizontal axis for rotative movement through the liquid and with their upper portions above the normal level of the crystallizing mass, and a plurality of scraper members respectively cooperative with said cooling elements and mounted on said container adjacent the upper portions of said cooling elements and for movement between inoperative positions beyond said cooling elements and operative positions adjacent said upper portions of said cooling elements for removing crystallized crusts therefrom.
  • scraper members comprise arms pivotally mounted at one end to extend radially along the sides of said cooling elements when in operative position.
  • scraper members comprise heating means to supply heat from said scraper members to said cooling elements for melting at least a part of the crusts thereon.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacture And Refinement Of Metals (AREA)
US30394A 1947-06-05 1948-06-01 Method and apparatus for removing the crusts of the cooling elements of a continuously operating crystallizer Expired - Lifetime US2570612A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2570612X 1947-06-05

Publications (1)

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US2570612A true US2570612A (en) 1951-10-09

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US30394A Expired - Lifetime US2570612A (en) 1947-06-05 1948-06-01 Method and apparatus for removing the crusts of the cooling elements of a continuously operating crystallizer

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US (1) US2570612A (en, 2012)
NL (1) NL63332C (en, 2012)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701266A (en) * 1949-08-12 1955-02-01 Ici Ltd Separation of p-xylene by crystallization
US3908001A (en) * 1971-11-18 1975-09-23 Energy Dev Ass Manufacture of chlorine hydrate
US4486395A (en) * 1979-12-19 1984-12-04 Goudsche Machinefabriek B.V. Continuously working crystallizer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1430900A (en) * 1920-10-28 1922-10-03 Diamond Match Co Apparatus for the production of crystals
GB291035A (en) * 1927-05-24 1929-04-04 Alois Rolz Improvements in cooling devices for mashing vessels for crystallisable material, more particularly for the sugar industry
US1755059A (en) * 1929-02-21 1930-04-15 Jr Edward J Gallagher Windshield wiper
US1790544A (en) * 1931-01-27 Automobile windshield scraper
US1868406A (en) * 1928-10-11 1932-07-19 Werkspoor Nv Apparatus for the heat treatment of sugar solutions either completely or partly crystallized
US2255393A (en) * 1940-03-28 1941-09-09 Osborn Charles Lee Windshield cleaner

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1790544A (en) * 1931-01-27 Automobile windshield scraper
US1430900A (en) * 1920-10-28 1922-10-03 Diamond Match Co Apparatus for the production of crystals
GB291035A (en) * 1927-05-24 1929-04-04 Alois Rolz Improvements in cooling devices for mashing vessels for crystallisable material, more particularly for the sugar industry
US1868406A (en) * 1928-10-11 1932-07-19 Werkspoor Nv Apparatus for the heat treatment of sugar solutions either completely or partly crystallized
US1755059A (en) * 1929-02-21 1930-04-15 Jr Edward J Gallagher Windshield wiper
US2255393A (en) * 1940-03-28 1941-09-09 Osborn Charles Lee Windshield cleaner

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701266A (en) * 1949-08-12 1955-02-01 Ici Ltd Separation of p-xylene by crystallization
US3908001A (en) * 1971-11-18 1975-09-23 Energy Dev Ass Manufacture of chlorine hydrate
US4486395A (en) * 1979-12-19 1984-12-04 Goudsche Machinefabriek B.V. Continuously working crystallizer

Also Published As

Publication number Publication date
NL63332C (en, 2012)

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