METHOD AND DEVICE FOR CONCENTRATING MATERIAL SOLUTIONS
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United States of America Patent
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Issued Date -
Sep 20, 2012
app pub date -
Sep 8, 2010
filing date -
Sep 11, 2009
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Abstract
A method is provided for concentrating a material solution using at least two consecutive membrane separating stages, each stage for separating the material solution into a retentate and a permeate. The cut-off of the membranes used in the separating stages is higher than that of the membrane used in the previous stage. The retentate of each separating stage, with the exception of the last stage, is fed to the following separating stage as a feed, and the permeate from at least one separating stage is fed back to a preceding separating stage and introduced into the feed thereof. The fed-back permeate has a concentration and viscosity that substantially corresponds to the concentration and viscosity of the preceding separating stage into which the permeate is introduced.
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