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Supercritical delignification of wood

  • US 5,041,192 A
  • Filed: 09/16/1988
  • Issued: 08/20/1991
  • Est. Priority Date: 09/16/1988
  • Status: Expired due to Term
First Claim
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1. Process for converting wood to pulp which comprises contacting wood with a supercritical fluid that contains a delignification agent comprising sodium hydroxide and/or sodium sulfide and/or sodium bisulfate under supercritical conditions sufficient to remove lignin, extractive and hemicellulose from the wood thereby making a full chemical pulp.

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