US2360445A - Evaporating apparatus - Google Patents

Evaporating apparatus Download PDF

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Publication number
US2360445A
US2360445A US502256A US50225643A US2360445A US 2360445 A US2360445 A US 2360445A US 502256 A US502256 A US 502256A US 50225643 A US50225643 A US 50225643A US 2360445 A US2360445 A US 2360445A
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US
United States
Prior art keywords
tank
evaporator
latex
tanks
preheater
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
US502256A
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English (en)
Inventor
Kurt Hans Quasebarth
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to US502256A priority Critical patent/US2360445A/en
Application granted granted Critical
Publication of US2360445A publication Critical patent/US2360445A/en
Priority to BE463523A priority patent/BE463523A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
    • C08C1/00—Treatment of rubber latex
    • C08C1/02—Chemical or physical treatment of rubber latex before or during concentration
    • C08C1/075—Concentrating
    • C08C1/12—Concentrating by evaporation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/16—Evaporating by spraying
    • 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
    • B01D3/06—Flash distillation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S159/00—Concentrating evaporators
    • Y10S159/10—Organic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S159/00—Concentrating evaporators
    • Y10S159/20—Additive
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S528/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S528/931—Physical treatment of natural rubber or natural rubber containing material or chemical treatment of non-rubber portion thereof, e.g. extraction of rubber from milk weed
    • Y10S528/934—Latex
    • Y10S528/937—Concentrating, e.g. creaming

Definitions

  • the present invention pertains to improvements in apparatus for concentrating. rubber latex by evaporation.
  • They include an evaporator operated under reduced pressure, into which preheated latex is fed in a finely divided state.
  • the apparatus described in the aforesaid patent has one undesirable feature; that is, the vacuum prevailing in the evaporator must be interrupted every time the finished concentrate is to be withdrawn. This feature is particularly inconvenient when the circulation of latex in the apparatus is to be effected without a pump.
  • An object of the present invention is to devise an improved apparatus which may be continuously operated Without interruption and in which the circulation is effected by a pump or, preferably, by means of differential pressure.
  • one of the principal features of the present invention is to employ a pluralityof tanks with the evaporator.
  • Each of these tanks serves, alternatingly, as a source of supply of latex to be fed to the evaporator or as a return reservoir for concentrated latex returning from the same.
  • each tank feeding the evaporator communicates with the atmosphere or a source of gas under increased pressure, while the pressure in each return tank is reduced to a value similar to thatprevailing in the evaporator.
  • FIG. 1 is a schematic section of an apparatus according to the present invention in which the through conduits 8 to and from tanks 2, 3,
  • each tank 4 is controlled by valves 20., 2b, 3a., 3b, 4a and 4b, respectively. Furthermore, each tank has four valve controlled outlets for communication with the atmosphere and supply of latex (2d, 3d, 46,),
  • the admission of latex into evaporator I is controlled by a valve I3.
  • Vacuum is produced wherever required in the apparatus by oneor more-conventional pumps (not shown) which communicate with the evaporator I through conduit I4 and with tanks 24 through manifold I2.
  • a deflector I5, a condenser I6 and a storage tank for condensate H are interposed in conduit I4.
  • tank 2 is, for instance, filled with dilute latex while tank 4 is empty.
  • Tank 2 is, then, placed in communication with manifold I I and tank 4 with manifold I2.
  • valves 2b and 4a are opened while valves 20,, 3a, 3b and 4b are closed. Accordingly, the contents of tank 2 will pass into evaporator I and the resulting concentrate will be drained into tank 4.
  • tank 2 is empty the valves will be actuated so that the contents of tank 4 pass through evaporator I into tank 3 which is placed under vacuum in advance.
  • This circulation from one tank into another through evaporator I is repeated until the concentrate in one of the tanks has the desired final concentration. Thereupon, the contents of that tank is withdrawn while another one is refilled with raw latex.
  • This arrangement has an advantage in that there is always one of the three tanks available which may be evacuated in advance so that no time is lost when evaporator I is switched from one tank to another. Also, when a charge of latex has reached the approximate final concentration, the idle tank may be refilled with raw latex while the circulation continues between the two other tanks and, while end products are withdrawn from one tank, the refilled tank can be switched-on to the preheater so that the operation of the apparatus is at no time interrupted.
  • the operation of the apparatus may be started with two full and one empty tanks. In that case, there will be a slight delay during the first passages of liquid from one tank to another, before the receiving tank is evacuated and can be placed in direct communication with the evaporator. However, the latter so that the third tank may assume the function of the idle tank described above.
  • the number of tanks may be reduced to two, although more than three may be provided.
  • Tank [1 may be provided with a measuring device, such as a gauge glass [8, so that the amount of evaporated water can be easily determined. This makes it easy to ascertain the right time for withdrawing a charge of finished concentrate.
  • a measuring device such as a gauge glass [8, so that the amount of evaporated water can be easily determined. This makes it easy to ascertain the right time for withdrawing a charge of finished concentrate.
  • Fig. 2 The apparatus shown in Fig. 2 is similar to that of Fig. 1 except for the omission of tank 4 and the addition of a pump 20 for the circulation of latex.
  • tank 2 for instance, is filled with raw latex.
  • Valves 2a and 3b are closed, while 2?) and 3a are open. Both tanksare placed in communication with vacuum manifold 12.
  • Pump 2-0 will, then, cause the contents of tank 2 to pass into evaporator I, whence it returns, concentrated, into tank 3.
  • tank 2 is empty the valves are reversed so that latex flows from tank 3 through evaporator I into tank 2.
  • the cycle of operations is repeated until the latex has reached the desired concentration.
  • the tank containing the concentrate for example tank 3, is then cut off from the evaporator, the pump and manifold l2, the tank is opened to the atmosphere and the contents withdrawn.
  • fresh dilute latex is supplied to the other tank 2 and, thence, fed to evaporator l.
  • the refilling with fresh latex can be so rapidly effected that no interruption in the operation of pump 20, preheater l and evaporator l is necessary.
  • tank 3 is again evacuated and ready to receive a fresh portion of concentrate.
  • a certain amount of latex may be allowed to accumulate in evaporator I or a third tan-k may be added, as in the apparatus according to Fig. 1.
  • the apparatus in which a pump is included has the advantage that latex may be circulated from one tank to the other through the evaporator while both tanks are under vacuum.
  • the tank to be drained may be cut off from the vacuum manifold and opened to the atmosphere. In the latter case, the differential pressure in the tanks will assist in causing circulation.
  • the apparatus according to Fig. 1 is, in many cases, more advantageous since it is frequently observed that a latex cannot be passed through a pump without risk of coagulation.
  • An apparatus for concentration of liquid, such as latex or the like, by evaporation under vacuum which comprises an evaporator, a source of vacuum, a preheater connected to said evaporator for heating said liquid prior to feeding the same to said evaporator, a plurality of tanks, conduits to connect said tanks to said evaporator and to said preheater, respectively, means to reduce' the pressure in each said tank to a value similar to that prevailing in said evaporator, a pump to cause said liquid to flow from said tanks to said preheater, and valve means in said conduits adapted to afford, alternatingly, flow of said liquid from one said tank through said preheater and said evaporator into another said tank;
  • An, apparatus for concentration of liquids, such as latex or the like, by evaporation under vacuum which comprises an evaporator, a source of vacuum, a preheater connected to said evaporatorfor heating said liquid prior to feeding the same tosaid evaporator, a plurality of tanks, conduits to connect said tanks to said evaporator and to said preheater, respectively, means to alternatingly reduce the pressure in each said tank to a value similar to that prevailing insaid evaporatorand to increase the same to a substantially higher value, and valve means in said conduits adapted alternatingly to afford flow of said liquid from one said tank through said preheater and said evaporator into another said tank.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
US502256A 1943-09-14 1943-09-14 Evaporating apparatus Expired - Lifetime US2360445A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US502256A US2360445A (en) 1943-09-14 1943-09-14 Evaporating apparatus
BE463523A BE463523A (fr) 1943-09-14 1944-11-16 Appareils pour la liquides,notamment de latex du caoutchouc.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US502256A US2360445A (en) 1943-09-14 1943-09-14 Evaporating apparatus

Publications (1)

Publication Number Publication Date
US2360445A true US2360445A (en) 1944-10-17

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ID=115594

Family Applications (1)

Application Number Title Priority Date Filing Date
US502256A Expired - Lifetime US2360445A (en) 1943-09-14 1943-09-14 Evaporating apparatus

Country Status (2)

Country Link
US (1) US2360445A (fr)
BE (1) BE463523A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3290153A (en) * 1964-09-18 1966-12-06 Schlitz Brewing Co J Process and apparatus for concentrating wort
US4117978A (en) * 1976-01-29 1978-10-03 Ruthner Industrieanlagen-Aktiengesellschaft System for feeding solutions and suspensions

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3290153A (en) * 1964-09-18 1966-12-06 Schlitz Brewing Co J Process and apparatus for concentrating wort
US4117978A (en) * 1976-01-29 1978-10-03 Ruthner Industrieanlagen-Aktiengesellschaft System for feeding solutions and suspensions

Also Published As

Publication number Publication date
BE463523A (fr) 1948-02-28

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