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Method and pulping composition for the selective delignification of lignocellulosic materials with an aqueous amine-alcohol mixture in the presence of a catalyst

  • US 4,597,830 A
  • Filed: 06/20/1983
  • Issued: 07/01/1986
  • Est. Priority Date: 06/20/1983
  • Status: Expired due to Fees
First Claim
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1. A pulping liquor for the delignification of lignocellulosic material consisting essentially of:

  • (A) a low molecular weight aliphatic alcohol selected from the group consisting of methanol, ethanol, butanol, pentanol and mixtures thereof;

    (B) an aliphatic amine selected from the group consisting of ethylene diamine, propylene diamine, hexamethylene diamine, methylaniline, ethylamine and mixtures thereof; and

    (C) water, wherein each of (A), (B), and (C) are present in amounts of 1-12 parts by volume, said liquor further comprising a catalyst selected from the group consisting of anthraquinone, benzoquinone, napthaquinone, phenazine, derivatives thereof and mixtures thereof present in amounts of grams of catalyst per milliliter of pulping liquor in a range of about 0.1;

    4 to 0.001;

    15.

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