Molecular weight reduction of polysaccharides by electron beams
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United States of America Patent
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Aug 21, 2007
Grant Date -
Apr 15, 2004
app pub date -
Jun 24, 2003
filing date -
Jun 25, 2002
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Abstract
A method of depolymerizing galactomannan-type polysaccharide polymers and xanthan, preferably galactomannans, to a pre-selected lower molecular weight by irradiation with high energy electron beams. The preferred galactomannans for treatment according to this method are guar gum, guar splits and hydroxypropyl guar. In a preferred embodiment the guar gum is depolymerized preferably to a molecular weight of about 150,000 Daltons to about 200,000 Daltons. The depolymerized guar has a polydispersity of less than about 3.0 and is useful in oil well fracturing to enhance oil production.
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