Subcritical gas assisted drying of biopolymer material
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United States of America Patent
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Aug 11, 2015
Grant Date -
Dec 13, 2012
app pub date -
Feb 18, 2011
filing date -
Feb 19, 2010
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Abstract
A method is provided for producing a dehydrated biopolymer powder, said method comprising the successive steps of: a) providing a filter cake comprising biopolymer material and 30 to 60 wt. % of water; b) contacting said filter cake with a pressurized gas to extract water from the filter cake, said pressurized gas having a pressure and a temperature below the critical point of the gas; c) separating water-containing pressurized gas from the dehydrated filter cake; and d) collecting a dehydrated biopolymer powder wherein the pressurized gas has a pressure of at least 0.6 MPa (6 bar) and up to 6 MPa (60 bar), and a temperature of 10 to 40° C.
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