Method of manufacturing phenols from lignin
AssigneesJgc Corporation, Japan Pulp & Paper Research Institute, Inc.
InventorsGohki Kakemoto, Hiroshi Sagara, Noriyuki Suzuki, Shogo Kachi
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Abstract
Phenols such as cresol, phenol and xylenol etc. are obtained by thermal decomposition of a lignin-containing material in a state of a mixture of the lignin-containing material and a double ring aromatic hydrocarbon solvent. Spent liquid of a solvolysis pulping process can be used as the lignin-containing raw material in the present invention for manufacturing phenols, and the phenols obtained can be utilized as the solvent in the solvolysis process resulting in cost reduction in the pulp production process by self-supplying the necessary solvent in the solvolysis process.
Claims9
A method of manufacturing phenols from lignin which comprises the following steps:
- dissolving plant lignin-cellulosic material in an organic or inorganic lignin removing solvent resulting in a lignin-containing material, said lignin-containing material being a lignin solution or by separating said lignin from said solution, a solid lignin-containing residue;
- mixing said lignin-containing material with a double ring aromatic hydrocarbon solvent;
- and
- decomposing said mixture at a temperature of 260.degree.-400.degree. C., under a pressure of 5-100 kg/cm.sup.2 G, for a time period of 5-180 minutes.
Dependencies are inferred from the claim text.