Effect of initially unsaturated porous frozen material on freeze-drying

Kai Yu, Wei Wang, Yanqiu Pan, Wei Wang, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


To overcome disadvantages of freeze-drying that is usually lengthy and expensive, a novel idea, freeze-drying of initially unsaturated porous frozen material, was proposed. An experimental investigation was performed to verify the effect of unsaturated frozen materials with a certain initial porosity on freeze-drying of liquid materials. A multifunctional freeze-drying apparatus on the lab scale was designed, made and assembled. Mannitol was selected as the primary solute in the solution. Liquid nitrogen ice-cream making method was used to prepare frozen materials with different initial saturations. Results show that the unsaturated frozen material can enhance the freeze-drying process significantly and the drying time is reduced substantially compared to conventional freeze-drying for the same material quantity and initial moisture content under the same operating conditions. The drying time with the unsaturated material (initial saturation=0.28) was 36.4% shorter than that with the conventional one(initial saturation=1.00). The smaller the initial saturation is, the shorter the drying time is and the lower the moisture content of dried products is.
Original languageEnglish
Pages (from-to)3110-3116
Number of pages7
JournalHuagong Xuebao/CIESC Journal
Issue number9
Publication statusPublished - 1 Sept 2013
Externally publishedYes


  • Drying curve
  • Freeze-drying
  • Initial saturation
  • Liquid material
  • Unsaturated

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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