US2523042A - Rotor for centrifugal stills - Google Patents

Rotor for centrifugal stills Download PDF

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Publication number
US2523042A
US2523042A US730126A US73012647A US2523042A US 2523042 A US2523042 A US 2523042A US 730126 A US730126 A US 730126A US 73012647 A US73012647 A US 73012647A US 2523042 A US2523042 A US 2523042A
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US
United States
Prior art keywords
rotor
centrifugal
aluminum
thickness
metal
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.)
Expired - Lifetime
Application number
US730126A
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English (en)
Inventor
Eric K Mclean
Russell H Ives
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 to FR961538D priority Critical patent/FR961538A/fr
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to US730126A priority patent/US2523042A/en
Priority to GB3611/48A priority patent/GB644631A/en
Application granted granted Critical
Publication of US2523042A publication Critical patent/US2523042A/en
Priority to DEE2984A priority patent/DE871296C/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/08—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping in rotating vessels; Atomisation on rotating discs

Definitions

  • This invention relates to animproved apparatus for vacuum distillation of thermally decomposable substances while in .the form of a thin film and particularly to a rotating vaporizing surface which will have uniform temperature.
  • lT-his invention has for its object to avoid a portion of the decomposition which takes place in centrifugal highvacuum "unobstructed-path distillation. Another object is to provide an improvedvaporizing surface for a centrifugal, highvacuum, unobstructed-path still. A further object is to provide a vaporizing surface for a centrifugal, high-vacuum, unobstructed-path still in whic'h the surface temperatureis nearly uniform at all points. Another 'object'isto improve the state of the art; Other obje-cts'will' appear hereinafter.
  • Vacuum distillation apparatus wherein a rotatable vaporizing surface is constructedrin comparatively thick form of a metal of high .thermal conductivity.
  • Comiparatively massive construction for example, heavy construction considerably in excess of the scale required in ord'er "for the rotor to have sufficient structural strength to function without breakdowmprovides a metal heat-reservoir whichgives the rotor, or vaporizing surface, a more uniform surface temperature than is the case where a thin metal rotor -.is used.
  • Fig. l is a partial top view of the rotorshown in-cross section in Fig. 2.
  • Fig. 2 is a sectional viewof .a rotorused in a small centrifugal still.
  • Fig. 3 is a sectional view of a cup-shaped rotor of a type used in a large centrifugal still.
  • numeral Ill desig nates the flat .area on which work liquid (not shown) is introduced.
  • Numeral 'll designates the area from which vaporization takes place.
  • Numeral I2 designates the center hole which is used to secure the rotor to the shaft (not shown). on which it rotates.
  • In'thepast rotors were made of aluminum or steel spinnings. A thin sheet of metal wasattached to a vwood or metal chuck of the shape desired for the rotor. The chuck was then. r0 tated and a tool held against the spinning metal until it conformedto the contours of the chuck. A very thin sheet of metal was used as it was easy to work into shape and offered less re-. sistance .tothe flow of heat from the heating element'located beneath the rotor.
  • thermal conductivity is usuually expressed as the B. t. u.s which will flow through a cubic foot of the metal in an hour where the temperature differential on two opposing sides is 1 F. The coefficient varies slightly at various temperatures.
  • the following table of thermal conductivity coeflicients at 212 F. is
  • the rotor thickness at the vaporizing surface will be as much as 1 /2 inches, that is, the ratio of the thickness to the diameter is 1/80.
  • a medium-size rotor e. g. in diameter
  • Combinations of metals of high thermal conductivity may be used.
  • copper is a very desirable material of construction but it has a destructive effect upon certain vitamins.
  • Silver is a desirable material of construction but it is expensive.
  • a rotor constructed of copper with a silver coating would be comparatively inexpensive and would have excellent performance characteristics.
  • Alloys may be used provided their coeiiicient of thermal conductivity is sufficiently high.
  • An alloy with a coefficient of 90 (B. t. u./(hr.) (sq. ft.) (F. per ft.)) or better would be substantially as effective as magnesium,
  • the surface area was the same for both the steel and aluminum rotors used in the test but the aluminum rotor was thicker.
  • the loss is approximately 16% as opposed to a 33% loss on a steel rotor.
  • Other improvements are decreased power consumption, less vibration, reduced and more uniform charring on the distillation surface, and easier cleaning.
  • the concentrate is of improved quality and is sufficiently bland to use in margarine fortification.
  • an aluminum rotor at least 30 inches in diameter and having a wall thickness in the region of the vaporizing surface at least of the diameter of the rotor, which thickness is substantially greater than the wall thickness necessary for structural strength.
  • an aluminum rotor having a diameter of 30 to 120 inches and a wall thickness in the region of the vaporizing surface of /120 to /60 the diameter of said rotor with the minimum thickness being not less than inch and the maximum thickness not more than 1 /2 inches, which wall thickness is substantially greater than the wall thickness necessary for structural strength of said rotor.
  • a cast aluminum rotor having a diameter not less than about 60 inches and a wall thickness in the region of the vaporizing surface of at least /120 the diameter of said rotor, which thickness is substantially greater than the wall thickness necessary for structural strength.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Centrifugal Separators (AREA)
US730126A 1947-02-21 1947-02-21 Rotor for centrifugal stills Expired - Lifetime US2523042A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR961538D FR961538A (is") 1947-02-21
US730126A US2523042A (en) 1947-02-21 1947-02-21 Rotor for centrifugal stills
GB3611/48A GB644631A (en) 1947-02-21 1948-02-07 Improvements in or relating to rotors for centrifugal stills
DEE2984A DE871296C (de) 1947-02-21 1950-10-01 Rotoren fuer Zentrifugal-Destillierapparate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US730126A US2523042A (en) 1947-02-21 1947-02-21 Rotor for centrifugal stills

Publications (1)

Publication Number Publication Date
US2523042A true US2523042A (en) 1950-09-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US730126A Expired - Lifetime US2523042A (en) 1947-02-21 1947-02-21 Rotor for centrifugal stills

Country Status (4)

Country Link
US (1) US2523042A (is")
DE (1) DE871296C (is")
FR (1) FR961538A (is")
GB (1) GB644631A (is")

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5334290A (en) * 1990-11-21 1994-08-02 Expanchimie S.A.R.L. Molecular distillation apparatus having induction-heating

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2343667A (en) * 1941-09-17 1944-03-07 Distillation Products Inc Centrifugal still

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2343667A (en) * 1941-09-17 1944-03-07 Distillation Products Inc Centrifugal still

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5334290A (en) * 1990-11-21 1994-08-02 Expanchimie S.A.R.L. Molecular distillation apparatus having induction-heating

Also Published As

Publication number Publication date
FR961538A (is") 1950-05-13
DE871296C (de) 1953-03-23
GB644631A (en) 1950-10-18

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