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GB950195A - Improvements in and relating to freeze drying and similar processes - Google Patents

Improvements in and relating to freeze drying and similar processes

Info

Publication number
GB950195A
GB950195A GB2038260A GB2038260A GB950195A GB 950195 A GB950195 A GB 950195A GB 2038260 A GB2038260 A GB 2038260A GB 2038260 A GB2038260 A GB 2038260A GB 950195 A GB950195 A GB 950195A
Authority
GB
United Kingdom
Prior art keywords
substance
resistivity
desired value
freeze
june
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
GB2038260A
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.)
Centre National de la Recherche Scientifique CNRS
Original Assignee
Centre National de la Recherche Scientifique CNRS
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 Centre National de la Recherche Scientifique CNRS filed Critical Centre National de la Recherche Scientifique CNRS
Publication of GB950195A publication Critical patent/GB950195A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • G05D23/2401—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor using a heating element as a sensing element
    • 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)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

950,195. Measuring moisture content. CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE. June 9,1960 [June 11, 1959], No. 20382/60. Heading G1N. [Also in Divisions F4 and G3] A freeze-drying process for treating a watercontaining solid substance is controlled so as to cause a measured electric characteristic of the substance to be maintained constant or to vary in a predetermined manner. A sample of a perishable organic or inorganic solid substance to be freezedried is placed in a glass container 3, Fig. 1, which is, in turn, placed in a sealed enclosure 1 evacuated by a two-stage pump (not shown). The low pressure encourages sublimation of water contained in the substance and control is necessary to prevent an undue fall of temperature in consequence. Current from a D.C. source 5 to electrodes immersed in the substance passes through a device 11 which produces a signal corresponding in magnitude and sense to deviation of the resistivity of the substance from the desired value. The signal from device 11 controls a switching unit 13 to operate a cooler 15 and/or an electric heater 14 as necessary to maintain the resistivity at a desired value. The desired value may remain constant or vary with time according to the setting of a programme device 12. The resistivity is indicated and recorded by devices 9 and 10 respectively. A thermostat (not shown) responsive to the temperature of the substance operates an alarm and prevents further heating when resistivity rises due to lack of water when the substance has been substantially de-hydrated. The Specification refers to control in accordance with the average resistivity of a number of samples. Enclosure 1 may serve for freeze-drying of the main body of the substance itself. The dielectric constant of the substance may be used instead of its resistivity.
GB2038260A 1959-06-11 1960-06-09 Improvements in and relating to freeze drying and similar processes Expired GB950195A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR797164A FR1236607A (en) 1959-06-11 1959-06-11 Method and device for controlling and regulating the freezing and thawing of various substances, and in particular for controlling and regulating freezing-drying operations

Publications (1)

Publication Number Publication Date
GB950195A true GB950195A (en) 1964-02-19

Family

ID=8715864

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2038260A Expired GB950195A (en) 1959-06-11 1960-06-09 Improvements in and relating to freeze drying and similar processes

Country Status (4)

Country Link
BE (1) BE588025A (en)
DE (1) DE1178787B (en)
FR (1) FR1236607A (en)
GB (1) GB950195A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19719398A1 (en) * 1997-05-07 1998-11-12 Amsco Finn Aqua Gmbh Process for controlling a freeze-drying process
FR2836482A1 (en) * 2002-02-25 2003-08-29 Zedrys Zeolite Drying System PROCESS AND FACILITIES FOR OBTAINING DRIED LIVING CELLS
DE102011075651A1 (en) 2010-05-12 2012-07-12 Gea Pharma Systems Limited Method for monitoring and / or controlling process parameters of a lyophilization process
CN115900239A (en) * 2021-09-30 2023-04-04 江西晶浩光学有限公司 Current compensation circuit, current compensation method and piezoelectric water mist removal device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1286002A (en) * 1961-01-17 1962-03-02 Usifroid Process for the regulation of freezing-drying operations and installation for its implementation
CH542415A (en) * 1971-09-30 1973-09-30 Nestle Sa Freeze drying installation
CH561887A5 (en) * 1973-02-05 1975-05-15 Nestle Sa
DE102008030269A1 (en) * 2008-06-19 2009-12-24 Arzneimittel Gmbh Apotheker Vetter & Co. Ravensburg Device for serial freeze-drying

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE516664A (en) *
BE444842A (en) * 1941-03-19
DE967879C (en) * 1950-07-27 1957-12-27 Otto Kiefer Dipl Kfm Device for moisture measurement of stacked goods in drying chambers
DE960259C (en) * 1951-01-26 1957-03-21 Konrad Wieser Automatic control device on dryers for stacked wood
DE1038988B (en) * 1956-08-22 1958-09-11 Leybold Hochvakuum Anlagen Control method of a freeze-drying and device for its execution
DE1102653B (en) * 1958-01-28 1961-03-16 Dr Med Karlheinz Neumann Vacuum freezer dryer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19719398A1 (en) * 1997-05-07 1998-11-12 Amsco Finn Aqua Gmbh Process for controlling a freeze-drying process
FR2836482A1 (en) * 2002-02-25 2003-08-29 Zedrys Zeolite Drying System PROCESS AND FACILITIES FOR OBTAINING DRIED LIVING CELLS
DE102011075651A1 (en) 2010-05-12 2012-07-12 Gea Pharma Systems Limited Method for monitoring and / or controlling process parameters of a lyophilization process
DE102011075651B4 (en) 2010-05-12 2023-11-02 Gea Lyophil Gmbh Method for monitoring and/or controlling process parameters of a lyophilization process
CN115900239A (en) * 2021-09-30 2023-04-04 江西晶浩光学有限公司 Current compensation circuit, current compensation method and piezoelectric water mist removal device

Also Published As

Publication number Publication date
DE1178787B (en) 1964-09-24
BE588025A (en) 1960-06-16
FR1236607A (en) 1960-07-22

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