Results 121 to 130 of about 169 (166)

Freeze drying - vacuum sublimation

Journal of Scientific Instruments, 1951
A short account is given of the principles involved in the dehydration of heat sensitive materials by sublimation from the frozen state. References are made to drying rates and important design features of commercial apparatus.
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Modeling of Vacuum Desorption in Freeze-Drying Process

Drying Technology, 2005
Abstract A mathematical model of multicomponent vacuum desorption, which occurs in vacuum freeze-drying process, was developed. In freeze-drying porous biomaterials and pharmaceuticals are considered and the vacuum freeze-drying process, especially the moisture desorption in its final stage, is investigated.
J. F. Nastaj, B. Ambrożek
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EFFECTS OF HEATING METHODS ON VACUUM FREEZE DRYING

Drying Technology, 1997
ABSTRACT The heat and mass transfer during freeze drying of raw beef by different heating methods is studied theoretically and experimentally. The difference between radiant heating and microwave heating in freeze drying process has been analyzed. The results obtained are important for the selection of the heating methods in practical freeze dryers.
Zhao Hui Wang, Ming Heng Shi
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Vacuum-Induced Nucleation as a Method for Freeze-Drying Cycle Optimization

Industrial & Engineering Chemistry Research, 2014
A new method using vacuum-induced nucleation to control the freezing process as a means of reducing the freeze-drying cycle and promoting batch homogeneity is proposed. Emphasis was also given to the primary drying stage performed by using in-line monitoring and control.
ODDONE, IRENE, PISANO, ROBERTO, Bullich R., Stewart P.   +3 more
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Vacuum techniques in freeze-drying pilot plants

Vacuum, 1967
Abstract Pilot plant scale operations are described in relation to the process requirements of the freeze-dried food industry. The principles of the freeze-drying process are outlined with examples of the currently available equipment and some techniques of product evaluation from the points of view of process economy and marketing feasibility.
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A comparison between vacuum freeze-drying and atmospheric freeze-drying

1990
International ...
Wolff, Estelle, Gibert, Hugo
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Vacuum Distillation and Freeze Drying

1979
Vacuum distillation is based on the fact that under vacuum the boiling point of the materials is lower than at normal atmospheric pressure. The use of vacuum distillation for distilling off solvents is required where elevated temperatures would destroy the resolved components. Working with some biologically active materials which are dissolved in water,
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Freeze-drying of Streptococcus thermophilus: A comparison between the vacuum and the atmospheric method

Cryobiology, 1990
Frozen suspensions of Streptococcus thermophilus were freeze-dried in a vacuum or a fluidized adsorbent bed at atmospheric pressure. Optimum operating conditions for each process were defined. For the duration of processing and survival rate of bacteria, in each case vacuum freeze-drying seemed more satisfactory than atmospheric pressure freeze-drying.
Wolff, Estelle, Delisle, B., Corrieu, Georges, Gibert, Hugo   +3 more
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Freeze drying and vacuum drying

2023
Carlos Eduardo Orrego, Natalia Salgado, Luisa Fernanda Sarmiento   +2 more
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Application and prospect of vacuum freeze drying technology in environmental field

Review of Scientific Instruments
Vacuum freeze-drying (VFD) technology has gained extensive application across various sectors, particularly in environmental applications, where it is primarily utilized for the fabrication of environmental functional materials and the conservation of environmental organisms. This technology is applicable to soil enhancement, the remediation of aquatic
Qingdan Liao, Dahua Yu, Xitong Li
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