Method for vapor phase pulping with alcohol, sulfur dioxide and ammonia
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United States of America Patent
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Oct 18, 2011
Grant Date -
May 12, 2011
app pub date -
Jan 11, 2011
filing date -
Mar 24, 2008
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Abstract
A method for the fractionation of lignocellulosic materials into cellulose, hemicelluloses and lignin in a batch or continuous process in a treatment with vaporous mixture of aliphatic alcohol, sulfur dioxide and water. Cooking conditions are varied to get different proportions of cellulose, hemicelluloses and lignin. Chemical recovery through pressure release is described.
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