FR2123742A5 - Dielectrically heated freeze drying - at enchanced press to prevent gas ionisation losses - Google Patents

Dielectrically heated freeze drying - at enchanced press to prevent gas ionisation losses

Info

Publication number
FR2123742A5
FR2123742A5 FR7103008A FR7103008A FR2123742A5 FR 2123742 A5 FR2123742 A5 FR 2123742A5 FR 7103008 A FR7103008 A FR 7103008A FR 7103008 A FR7103008 A FR 7103008A FR 2123742 A5 FR2123742 A5 FR 2123742A5
Authority
FR
France
Prior art keywords
press
torr
enchanced
radiation
freeze drying
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
FR7103008A
Other languages
French (fr)
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Priority to FR7103008A priority Critical patent/FR2123742A5/en
Application granted granted Critical
Publication of FR2123742A5 publication Critical patent/FR2123742A5/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
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • 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)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

To avoid localised overheating, waer is sublimed from deep-frozen material by high frequency radiation to increase temp. to just below 0 degrees C, at is approx. 10-1 Torr, low enough for mean free path to be comparable with sepn. between material and condenser so that molecular distn. is possible, but high enough to prevent ionization of gas causing voltage breakdown. Pref. press. is reduced to 10-3 Torr and increased to 10-1 Torr by introduction of inert gas e.g. N2. Radiation may be fed through wave guide to expanded metal enclosure around evacuated vessel, from which water vapour passes through a metal grille shielding the condenser. Radiation generator may be under prod. temp. control.
FR7103008A 1971-01-29 1971-01-29 Dielectrically heated freeze drying - at enchanced press to prevent gas ionisation losses Expired FR2123742A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7103008A FR2123742A5 (en) 1971-01-29 1971-01-29 Dielectrically heated freeze drying - at enchanced press to prevent gas ionisation losses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7103008A FR2123742A5 (en) 1971-01-29 1971-01-29 Dielectrically heated freeze drying - at enchanced press to prevent gas ionisation losses

Publications (1)

Publication Number Publication Date
FR2123742A5 true FR2123742A5 (en) 1972-09-15

Family

ID=9071113

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7103008A Expired FR2123742A5 (en) 1971-01-29 1971-01-29 Dielectrically heated freeze drying - at enchanced press to prevent gas ionisation losses

Country Status (1)

Country Link
FR (1) FR2123742A5 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2358802A1 (en) * 1976-07-14 1978-02-10 Finlay Maxwell David HIGH FREQUENCY HEATING PROCESS
FR2585502A1 (en) * 1985-07-29 1987-01-30 Doryokuro Kakunenryo METHOD AND APPARATUS FOR TREATING A RADIOACTIVE LIQUID WASTE
WO2001036888A1 (en) * 1999-11-15 2001-05-25 Hull Corporation Microwave lyophilizer and microwave lyophilization method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2358802A1 (en) * 1976-07-14 1978-02-10 Finlay Maxwell David HIGH FREQUENCY HEATING PROCESS
FR2585502A1 (en) * 1985-07-29 1987-01-30 Doryokuro Kakunenryo METHOD AND APPARATUS FOR TREATING A RADIOACTIVE LIQUID WASTE
WO2001036888A1 (en) * 1999-11-15 2001-05-25 Hull Corporation Microwave lyophilizer and microwave lyophilization method

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