GB586693A - Improvements in desiccation methods and apparatus - Google Patents

Improvements in desiccation methods and apparatus

Info

Publication number
GB586693A
GB586693A GB1719244A GB1719244A GB586693A GB 586693 A GB586693 A GB 586693A GB 1719244 A GB1719244 A GB 1719244A GB 1719244 A GB1719244 A GB 1719244A GB 586693 A GB586693 A GB 586693A
Authority
GB
United Kingdom
Prior art keywords
condenser
temperature
substance
receiver
solid
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
Application number
GB1719244A
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.)
National Research Corp
Original Assignee
National Research Corp
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 National Research Corp filed Critical National Research Corp
Priority to GB1719244A priority Critical patent/GB586693A/en
Publication of GB586693A publication Critical patent/GB586693A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/06—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum the process involving freezing

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Freezing, Cooling And Drying Of Foods (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Solid and liquid foods, chemicals and plasma are desiccated without deterioration by exposing the substance to reduced pressure at a temperature below 50 DEG C., condensing and freezing the vapours, which are evolved, upon a surface maintained at a temperature below 0 DEG C., and repeatedly removing the solidified condensate from the surface while the process is in operation. The pressure is preferably maintained between 0.1 and 10mm., and the temperature of the condensing surface between -40 DEG and -70 DEG C. The substance to be desiccated is introduced through a duct 12 into vessel 10 which is connected to a vacuum pump at 20 through port 18, condenser 26, receiver 62 and auxiliary condenser 92. The substance is agitated during desiccation and may be heated to prevent excessive lowering of its temperature which may occur owing to rapid vaporisation. The vapours evolved are condensed and solidified on the cylindrical inner surface of condenser 26 from <PICT:0586693/III/1> <PICT:0586693/III/2> which the solid is continuously removed by a rotary scraper 36, extending longitudinally through the condenser, and deposited into the refrigerated receiver 62 kept at a temperature less than 10 DEG C. above the temperature of condenser 26. The purpose of the auxiliary condenser 92, which is equipped with a rotary scraper 104, is to ensure that no vapour, sublimed from receiver 62, reaches the vacuum pump. A grinder may be placed in the inlet duct 12 before the valve 13 if it is desired to reduce a solid to small particles before desiccation. The substance may be heated by placing it between condenser plates connected to a high frequency electric current, or by the use of an infra red lamp.
GB1719244A 1944-09-08 1944-09-08 Improvements in desiccation methods and apparatus Expired GB586693A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1719244A GB586693A (en) 1944-09-08 1944-09-08 Improvements in desiccation methods and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1719244A GB586693A (en) 1944-09-08 1944-09-08 Improvements in desiccation methods and apparatus

Publications (1)

Publication Number Publication Date
GB586693A true GB586693A (en) 1947-03-27

Family

ID=10090864

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1719244A Expired GB586693A (en) 1944-09-08 1944-09-08 Improvements in desiccation methods and apparatus

Country Status (1)

Country Link
GB (1) GB586693A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1140875B (en) * 1961-08-30 1962-12-06 Leybold Hochvakuum Anlagen Process for vacuum drying or degassing of powdery substances
US3445247A (en) * 1964-10-08 1969-05-20 Basic Vegetable Products Inc Freeze dried product and process for producing the same
BE1005062A3 (en) * 1991-07-03 1993-04-06 Koeltechniek Louw Working method for the optimisation of the operation of a condenser to beused in freeze-drying techniques and device used for this
EP1706693A1 (en) * 2003-12-24 2006-10-04 Edward K. Alstat Method and apparatus for reclaiming effluent from a freeze-drying process, and uses for effluent

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1140875B (en) * 1961-08-30 1962-12-06 Leybold Hochvakuum Anlagen Process for vacuum drying or degassing of powdery substances
US3445247A (en) * 1964-10-08 1969-05-20 Basic Vegetable Products Inc Freeze dried product and process for producing the same
BE1005062A3 (en) * 1991-07-03 1993-04-06 Koeltechniek Louw Working method for the optimisation of the operation of a condenser to beused in freeze-drying techniques and device used for this
EP1706693A1 (en) * 2003-12-24 2006-10-04 Edward K. Alstat Method and apparatus for reclaiming effluent from a freeze-drying process, and uses for effluent
EP1706693A4 (en) * 2003-12-24 2009-01-14 Edward K Alstat Method and apparatus for reclaiming effluent from a freeze-drying process, and uses for effluent

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