US3090732A - Construction and arrangement of wipers in thin-film evaporators - Google Patents

Construction and arrangement of wipers in thin-film evaporators Download PDF

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Publication number
US3090732A
US3090732A US811099A US81109959A US3090732A US 3090732 A US3090732 A US 3090732A US 811099 A US811099 A US 811099A US 81109959 A US81109959 A US 81109959A US 3090732 A US3090732 A US 3090732A
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United States
Prior art keywords
evaporator
vane
drum
thin
condenser
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Expired - Lifetime
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US811099A
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English (en)
Inventor
Pinkwart Dieter
Schneider Rudolf
Strittmatter Werner
Gruber Emil
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Bayer AG
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Bayer AG
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
    • B01D1/222—In rotating vessels; vessels with movable parts
    • B01D1/223—In rotating vessels; vessels with movable parts containing a rotor
    • B01D1/225—In rotating vessels; vessels with movable parts containing a rotor with blades or scrapers

Definitions

  • the invention relates to the construction and arrangement of wipers in thin-film evaporators, in which the blade-shaped wipers for spreading the liquid to be treated over a heated wall are arranged on a stirrer mechanism.
  • stirrer vanes With an evaporator having a built-in condenser, those edges of the stirrer vanes which face the evaporation surface extend rearwardiy in relation to those edges facing the condensation surface, when seen in the direction of rotation, and the vanes overlap in louvre formation or in form of reales with such a spacing that it is not possible from any position on the condenser surface to see any point of the evaporator surface.
  • the stirrer vanes can be constructed as wipers pivotally a1- rangcd about pins or as stirrer vanes secured fast to the stirrer mechanism and they can be given an arcuate curvature, so as to aerodynamically improve the rotation of the vapour column ascending inside the evaporator vessel.
  • the blade-shaped stirrer vanes are preferably formed with radial incision at their longitudinal sides; the lugs between the incisions are bent out of the plane of the vane.
  • the lugs or flaps form separate helical elements for spreading the liquid, the edges of these eicrnents sweeping past close to the inside wall of the evaporator or rubbing thereon if the wipers are pivotally arranged.
  • Each vane has a relatively large number of such flaps, all of which are bent out in the same direction from the plane of the vane.
  • the flaps of a stirrer vane or alternately the adjacent stirrer vanes can be set at such an inclination that they wipe the liquid downwardly or upwardly. If a long residence time is desired, all fiaps are set with an upward inclination, so that they have a conveying effect opposite to the liquid running down because of gravity. Por shortening the residence time, all flaps are set with a downward inclination.
  • evaporators having fittings in louvre formation are known, but these fittings serve as condenser surfaces and have no wiper action.
  • Louvre-type fittings are also known which serve as spray separators. These fittings also have no wiper action and give no complete protection against radiation.
  • FIGURE 1 is a longitudinal section through the evaporator with a condenser arranged outside the evaporator.
  • FIGURES 2, 3 and 4 represent ci'osssections through wiper-type stirrers the pivoted wiper blades of which are of different shapes.
  • FIGURE 5 is a longitudinal section through the evaporator with a built-in condenser and having pivotally arranged stirrer vanes acting as wipers, and
  • FIGURE 6 is a cross-section through this evaporator on the line a--b.
  • FIGURES 7 and 8 show cross-sections of an evaporator with rigid stirrer vanes.
  • FIGURE 9 shows a part of the edge of a stirrer vane, seen in a direction radially towards the axis.
  • FIGURE 10 illustrates an evaporator cross-section with stirrer vanes constructed as eccentrically mounted angular vanes.
  • FIGURE 1
  • Wipers 10 pivotally arranged about pins 9 are mounted on the shaft 7 in rings 8 secured concentrically of the shaft, these wipers sweeping over the internal wall of the vessel 3 and thereby distributing the film of liquid running down the Wall.
  • a slide surface which is for example constructed as a bearing ring 33 sliding on the internal surface of the vessel and ensuring a centering of the shaft.
  • the pins 9 of the wipers 10 are so closely arranged louvre-fashion that those edges of the wipers which slide on the cylindrical surface 3 are concealed behind the pivot edge of the following wiper in each case, when seen from the centre of the shaft.
  • FIGURE 3 shows blades with an arcuate curvature, whereby more favourable flow conditions are obtained for the resulting vapour and at the same time the vapour stream rising in the evaporator is caused to rotate. Due to the rotation of the vapour, any entrained drops are again thrown back on to the heated wall.
  • FIGURE 4 shows another possible arrangement in which the pivot point 9 of each wiper 10 is not at the leading edge of the wiper, but positioned towards the centre of the latter. Such blades ensure the strong rotation of the ascending vapour column.
  • 16 is the discharge union for the gases which cannot be condensed, which union communicates with the vacuum device (not shown).
  • Rings 18, which are connected to reinforcing rods 18a, are fixed concentrically on the shaft 17 and carry the stirrer vanes which are movable about pins 19 and which are in the form of Wipers 20. the latter sweeping over the inside of the vessel 13 and thus distributing the liquid film running down thereon.
  • Located at the end of the shaft is a slide surface in form of a bearing ring 21 which slides on the internal surface of the vessel and ensures centering of the shaft.
  • the wipers are so arranged in louvre formation that those edges of the wipers which slide on the surface of rotation are concealed behind the edge of the following wiper in each case, when seen from the centre 26 of the shaft and also from any point 22:; of the condenser 22 arranged inside the evaporator.
  • FIGURES 7, 8 and 9 illustrate cross-sections through an evaporator, the vanes 27 of which are secured fast to the rings 18 of the stirrer mechanism.
  • the vanes 20 or 27 are formed at their outer edges with flaps or lugs 28 (FIG. 8) which are bent out from the plane of the vanes 20 or 27 between the incisions 29 (FIG. 9) in such a way that they form helically curved small blades, the edges of which sweep past the internal wall 13 of the evaporator.
  • the wiper vanes are in the form of eccentrically mounted pivoted angular vanes 20.
  • the longer wiper arm 31, which sweeps along the evaporator wall, serves for spreading the liquid on the heated wall and as a protection against radiation, while the shorter arm 32 serves as a stripper for the condensation film on the condenser surface 22.
  • a thin-film evaporator apparatus comprising a drum means, and a plurality of vane means disposed within said drum means and mounted for rotation therewithin, said drum means having an inner wall evaporator surface adapted for maintaining a thin film of liquid to be evaporated thereon, said vane means being axially disposed in said drum means in sliding abutment with said evaporator surface along a portion of their radially outermost edges and in closely overlapping spaced relation to one another at an angle with respect to the plane of the radius of the drum at any point to form an overlapping vane arrangement annular in cross-section circumferentially closing off direct radial communication between the drum axis and said evaporator surface, whereby with respect to said evaporator surface said vane means are positioned such that any line passing radially from the axis of said drum means to said evaporator surface intersects at least one vane means.
  • a thin-film evaporator apparatus comprising a drum means, a plurality of vane means disposed within said drum means and mounted for rotation therewithin, and a condenser surface means positioned in said drum means axially with respect to said vane means, said drum means having an inner wall evaporator surface adapted for maintaining a thin film of liquid to bc evaporated thereon, said vane means being axially disposed in said drum means in sliding abutment with said evaporator surface along a portion of their radically outermost edges and in closely overlapping spaced relation to one another at an angle with respect to the plane of the radius of the drum at any point to form intermediate said evaporator surface and the condenser surface of said condenser surface means an overlapping vane arrangement annular in crosssection circumferentially closing off direct radial communication between the condenser surface and said evaporator surface, whereby with respect to said evapora tor surface and said condenser surface said vane means are positioned such that any line passing
  • a thin-film evaporator apparatus comprising a drum means, a plurality of vane means disposed Within said drum means and mounted for rotation therewithin, and a condenser surface means positioned in said drum means axially with respect to said vane means, said drum means having an inner wall evaporator surface adapted for main taining a thin-film of liquid to be evaporated therein, said vane means being disposed in said drum means in overlapping spaced relation to one another and mounted for rotation intermediate said evaporator surface and the condenser surface of said condenser surface means such that with respect to said evaporator surface and said condenser surface any line passing from the axis of said drum means through said condenser surface to said evaporator surface intersects at least one vane means, said vane means including a radially outer edge in sliding abutment with said evaporator surface and a radial y inner edge in sliding abutment with said condenser surface.
  • a thin-film evaporator apparatus according to claim 1 wherein said vane means are mounted on a shaft for rotation therewith.
  • a thin-film evaporator apparatus wherein said shaft is provided with radial extension means for seating said vane means in radially displaced relation with respect to said shaft and in sliding abutment with said evaporator surface.
  • a thin-film evaporator apparatus according to claim 5 wherein said radial extension means are disc means mounted on said shaft and said vane means are seated on said disc means for rotation therewith.
  • a thin-film evaporator apparatus according to claim 1 wherein said vane means are substantially arcuate in shape.
  • a thin-film evaporator apparatus according to claim 1 wherein said vane means are substantially fiat in shape.
  • a thin-film evaporator apparatus according to claim 5 wherein said vane means are fixedly seated on said extension means.
  • a thin-film evaporator apparatus according to to claim 5 wherein said vane means are pivotally seated on said extension means.
  • a thin-film evaporator apparatus according to claim 10 wherein said vane means are arcuate in shape, having a leading and a trailing edge portion, and are pivotally seated at a point intermediate the leading and trailing edge portions.
  • a thimfilm evaporator apparatus according to claim 2 wherein said evaporator is provided with collection means for collecting condensate formed on said condenser surface.
  • a thin-film evaporator apparatus wherein said vane means are mounted for rotation with a rotatable shaft and are fixedly seated to an annular ring interposed between said evaporator surface and said condenser means to maintain said vane means in overlapping spaced relation.
  • a thin-film evaporator apparatus according to claim 1 wherein said vane means include in their outer edges in sliding abutment with said evaporator surface a plurality of extension flaps diverging from the plane of said van means, the outer edges of said extension flaps slidably abutting said evaporator surface.
  • a thin-film evaporator appartus comprising a drum means, a plurality of vane means disposed within said drum means and mounted for rotation therewithin, and
  • a condenser surface means positioned in said drum means axially with respect to said vane means, said drum means having an inner wall evaporator surface adapted for maintaining a thin-film of liquid to be evaporated thereon, said vane means being disposed in said drum means in overlapping spaced relation to one another and mounted for rotation intermediate said evaporator surface and the condenser surface of said condenser surface means, such that, with respect to said evaporator surface and said condenser surface, any line passing from the axis of said drum means through said condenser surface to said evaporator surface intersects at least one vane means, said vane means being angularin shape and pivotally mounted intermediate said evaporator surface and said condenser surface with a radially outer edge in sliding abutment with said evaporator surface and radially inner edge in sliding abutment with said condenser surface.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
US811099A 1958-05-07 1959-05-05 Construction and arrangement of wipers in thin-film evaporators Expired - Lifetime US3090732A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEF25709A DE1061293B (de) 1958-05-07 1958-05-07 Ausbildung und Anordnung von Wischern in Duennschichtverdampfern
DEF0026402 1958-08-14

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US3090732A true US3090732A (en) 1963-05-21

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US (1) US3090732A (enrdf_load_stackoverflow)
BE (1) BE578447A (enrdf_load_stackoverflow)
CH (1) CH374366A (enrdf_load_stackoverflow)
DE (2) DE1061293B (enrdf_load_stackoverflow)
FR (1) FR1223731A (enrdf_load_stackoverflow)
GB (1) GB923889A (enrdf_load_stackoverflow)
NL (2) NL238808A (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3170852A (en) * 1962-06-22 1965-02-23 Clyde S Barnhart Proximity surface still
US3332855A (en) * 1963-01-02 1967-07-25 Vitamins Ltd Molecular still of the rotary wiped film type
US3393133A (en) * 1965-06-16 1968-07-16 Artisan Ind Short path, molecular fractional distillation apparatus and method therefor
US3695327A (en) * 1969-03-21 1972-10-03 Luwa Ag Wiped thin film evaporation and treatment apparatus
US4065346A (en) * 1975-11-26 1977-12-27 Ivan Frolovich Evkin Roter thin-film evaporator
US4282058A (en) * 1979-05-03 1981-08-04 Luwa Ag Apparatus for thermal treatment of flowable materials
US20090134369A1 (en) * 2007-11-26 2009-05-28 Applied Nanoworks, Inc. Metal alkoxides, apparatus for manufacturing metal alkoxides, related methods and uses thereof
US20120037488A1 (en) * 2010-07-21 2012-02-16 Aquaback Technologies Inc. Distiller
CN104801055A (zh) * 2015-04-07 2015-07-29 于胜宾 一种柔性刮板式蒸发装置
CN105879419A (zh) * 2016-05-30 2016-08-24 无锡科技职业学院 一种双段刮板式蒸发器
WO2021126783A1 (en) * 2019-12-17 2021-06-24 Wiley Organics, Inc. Processing system and method
US20220161153A1 (en) * 2019-06-12 2022-05-26 Aurotec Gmbh Thin-layer treatment device

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USB382815I5 (enrdf_load_stackoverflow) * 1959-03-24
US3130108A (en) * 1960-11-07 1964-04-21 Blaw Knox Co Rotating blade type evaporators
CH390222A (de) * 1960-11-14 1965-04-15 Luwa Ag Dünnschichtbehandlungsapparat
US3180398A (en) * 1961-10-05 1965-04-27 Rodney Hunt Machine Co Thin film thermal processor
US3180399A (en) * 1961-10-27 1965-04-27 Rodney Hunt Machine Co Thin film thermal processor
CH416557A (de) * 1962-10-10 1966-07-15 Bayer Ag Rührwerke für Dünnschichtverdampfer
DE1619713A1 (de) * 1967-03-29 1970-12-17 Leybold Heraeus Gmbh & Co Kg Vorrichtung zur Vakuum- und Kurzwegdestillation
JPS5267048A (en) * 1975-11-27 1977-06-03 Furorouitsuchi Efukin Iwan Rotor thin film evaporator
AT516504B1 (de) * 2015-06-12 2016-06-15 Gig Karasek Gmbh Dünnschichtverdampfer
CN105233514B (zh) * 2015-11-10 2017-10-24 李书龙 一种基于分离式热管的薄膜蒸发器及其使用方法

Citations (6)

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US2403978A (en) * 1944-09-12 1946-07-16 Distillation Products Inc Vacuum distillation apparatus
US2500900A (en) * 1946-11-21 1950-03-14 Goodrich Co B F Apparatus for film-type distillation
US2546381A (en) * 1947-03-03 1951-03-27 Hurd Corp Apparatus for concentrating liquids
US2766193A (en) * 1952-04-07 1956-10-09 Bayer Ag Apparatus for distilling or evaporating liquids
US2848388A (en) * 1954-08-27 1958-08-19 Bueche Walter Apparatus for the rectification of multicomponent mixtures
US2974725A (en) * 1954-05-04 1961-03-14 Bayer Ag Process and apparatus for continuously obtaining dry materials

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2403978A (en) * 1944-09-12 1946-07-16 Distillation Products Inc Vacuum distillation apparatus
US2500900A (en) * 1946-11-21 1950-03-14 Goodrich Co B F Apparatus for film-type distillation
US2546381A (en) * 1947-03-03 1951-03-27 Hurd Corp Apparatus for concentrating liquids
US2766193A (en) * 1952-04-07 1956-10-09 Bayer Ag Apparatus for distilling or evaporating liquids
US2974725A (en) * 1954-05-04 1961-03-14 Bayer Ag Process and apparatus for continuously obtaining dry materials
US2848388A (en) * 1954-08-27 1958-08-19 Bueche Walter Apparatus for the rectification of multicomponent mixtures

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3170852A (en) * 1962-06-22 1965-02-23 Clyde S Barnhart Proximity surface still
US3332855A (en) * 1963-01-02 1967-07-25 Vitamins Ltd Molecular still of the rotary wiped film type
US3393133A (en) * 1965-06-16 1968-07-16 Artisan Ind Short path, molecular fractional distillation apparatus and method therefor
US3695327A (en) * 1969-03-21 1972-10-03 Luwa Ag Wiped thin film evaporation and treatment apparatus
US4065346A (en) * 1975-11-26 1977-12-27 Ivan Frolovich Evkin Roter thin-film evaporator
US4282058A (en) * 1979-05-03 1981-08-04 Luwa Ag Apparatus for thermal treatment of flowable materials
US8877131B2 (en) 2007-11-26 2014-11-04 Auterra, Inc. Metal alkoxides, apparatus for manufacturing metal alkoxides, related methods and uses thereof
US20090134369A1 (en) * 2007-11-26 2009-05-28 Applied Nanoworks, Inc. Metal alkoxides, apparatus for manufacturing metal alkoxides, related methods and uses thereof
US20100178218A1 (en) * 2007-11-26 2010-07-15 Auterra, Inc. Metal alkoxides, apparatus for manufacturing metal alkoxides, related methods and uses thereof
US20100178220A1 (en) * 2007-11-26 2010-07-15 Auterra, Inc. Metal alkoxides, apparatus for manufacturing metal alkoxides, related methods and uses thereof
US9028768B2 (en) * 2007-11-26 2015-05-12 Auterra, Inc. Metal alkoxides, apparatus for manufacturing metal alkoxides, related methods and uses thereof
US8858758B2 (en) * 2010-07-21 2014-10-14 Aquaback Technologies, Inc. Distiller
US20120037488A1 (en) * 2010-07-21 2012-02-16 Aquaback Technologies Inc. Distiller
US9770676B2 (en) 2010-07-21 2017-09-26 Aquaback Technologies, Inc. Distiller
CN104801055A (zh) * 2015-04-07 2015-07-29 于胜宾 一种柔性刮板式蒸发装置
CN105879419A (zh) * 2016-05-30 2016-08-24 无锡科技职业学院 一种双段刮板式蒸发器
US20220161153A1 (en) * 2019-06-12 2022-05-26 Aurotec Gmbh Thin-layer treatment device
US12102939B2 (en) * 2019-06-12 2024-10-01 Aurotec Gmbh Thin-layer treatment device
WO2021126783A1 (en) * 2019-12-17 2021-06-24 Wiley Organics, Inc. Processing system and method
US11406974B2 (en) 2019-12-17 2022-08-09 Wiley Organics, Inc. Processing system and method
US11872553B2 (en) 2019-12-17 2024-01-16 Wiley Organics, Inc. Processing system and method

Also Published As

Publication number Publication date
FR1223731A (fr) 1960-06-20
BE578447A (fr) 1959-08-31
CH374366A (de) 1964-01-15
NL238808A (enrdf_load_stackoverflow)
DE1061293B (de) 1959-07-16
DE1068219B (de) 1959-11-05
NL122352C (enrdf_load_stackoverflow)
GB923889A (en) 1963-04-18

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