Microwave-assisted separations using volatiles

  • US 5,884,417 A
  • Filed: 09/11/1997
  • Issued: 03/23/1999
  • Est. Priority Date: 02/10/1992
  • Status: Expired due to Term
First Claim
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1. In a method for the microwave extraction of at least one natural product from a biological material, said method consisting in:

  • placing said biological material in an enclosure without any solvent,making said biological material present in said enclosure undergo microwave irradiation in order to prompt the evaporation of at least a part of the water contained in said biological material, so as to enable the release of at least a part of said natural product,separating the residual biological material from the extracted natural product,the improvement wherein said method includes the steps ofcyclically intermittently applying reduced pressure within said enclosure during said step for the application of microwaves,heating said enclosure during at least the essential part of said step for the application of microwaves, the combination of said steps for the application of the microwaves, the application of reduced pressure within the enclosure and the heating of the enclosure permitting the volatilization of said natural product from said biological material.

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