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Liquid substances freeze-drying systems and methods

  • US 5,208,998 A
  • Filed: 10/03/1991
  • Issued: 05/11/1993
  • Est. Priority Date: 02/25/1991
  • Status: Expired due to Fees
First Claim
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1. In a system for the spray-freeze-drying of a fluid substance having a substantial content of solids dissolved in a liquid that includes a vertically elongated vessel having top, bottom and central portions, atomizing means including a nozzle positioned centrally in said vessel adjacent said top portion to deliver atomized particles of said fluid substance into said vessel, fluidizing means in said bottom portion to fluidize particles of frozen product formed in said vessel by upward flow of process gas into said vessel including a bottom opening in said bottom portion, cooling means to cool gas circulating in said system, heating means to heat gas circulating in said system and gas circulation means for introducing and withdrawing process gas into and from said vessel, the improvement which comprises:

  • a top opening in said top portion of said vessel,said gas circulation means comprising conduit means connecting said top opening to said bottom opening,pump means associated with said conduit means to move said process gas thorough said conduit means,a heat pump including a hot side and a cold side,a hot tank connected to said hot side,a cold tank connected to said cold side,first plumbing means connecting said hot tank to said heating means for circulation of heat exchange fluid between said hot tank and said heating means, andsecond plumbing means connecting said cold tank to said cooling means for circulation of heat exchange fluid between said cold tank and said cooling means.

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