Chemistry: physical processes – Physical processes – Crystallization
Reexamination Certificate
2008-07-29
2008-07-29
Johnson, Edward M (Department: 1793)
Chemistry: physical processes
Physical processes
Crystallization
Reexamination Certificate
active
07404828
ABSTRACT:
A method of preparing particles of a substance, for example selected from a flavor, fragrance, pigment, dye, biologically active compound or a plastics material, comprises contacting the substance of a formulation (which may include the substance in conjunction with a second solvent) with a first solvent which comprises a C1-C4 hydrofluorocarbon, especially tetrafluoroethane, and subjecting the resultant mixture to a separation process, for example, by allowing the mixture to be sprayed as a mist (14) from a high pressure environment in a first vessel (2) to a low pressure environment in a second vessel (8), thereby to cause separation of a least some of the substance from the first solvent and the formation of fine particles (20) of the substance.
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Burke Andrea W.
Furman Theodore R.
Glaxo Group Limited
Johnson Edward M
Kinzig Charles M.
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