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Methods for treating lignocellulosic materials

  • US 9,631,246 B2
  • Filed: 11/10/2014
  • Issued: 04/25/2017
  • Est. Priority Date: 05/03/2012
  • Status: Active Grant
First Claim
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1. A method of fractionating a hemicellulose sugar mixture, the method comprising:

  • (i) fractionating the hemicellulose sugar mixture with a sequential simulated moving bed chromatography sequence, wherein the sequential simulated moving bed chromatography sequence comprises;

    (1) passing a feed stream into an adsorbent, thereby flushing a first raffinate stream from the adsorbent;

    (2) flushing a second raffinate stream from the adsorbent with a desorbent stream; and

    (3) recycling the desorbent stream back to the adsorbent; and

    (ii) recovering a first product stream and a second product stream from the sequential simulated moving bed chromatography sequence, wherein the first product stream is extracted in (1) and the second product stream is extracted in (2), and wherein the hemicellulose sugar mixture is thereby fractionated to produce a xylose-enriched stream and a xylose-removed hemicellulose sugar mixture,wherein the first product stream and the second product stream are each enriched in xylose relative to the feed stream.

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