Method for separating and recovering lignin derivatives
AssigneeJapan Science and Technology Agency
InventorsMasamitsu Funaoka, Mitsuru Aoyagi
Life of this patent
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Abstract
An object of the present invention is to provide a technique for separation/collection of a lignin derivative which is useful for the separation of a lignin derivative having a 1,1-diphenylpropane unit and/or a unit derived from the 1,1-diphenylpropane unit from a mixture system containing the lignin derivative. In the Present invention, a lignin derivative having a 1,1-diphenylpropane unit and/or a unit derived from the 1,1-dipheylpropane unit is allowed to contact with a metal oxide in a liquid medium, thereby separating the lignin derivative in the form retained on the metal oxide.
Claims18
A method for separating a lignin derivative, the method comprising:
- contacting the lignin derivative with a metal oxide in a liquid medium,
- separating the metal oxide carrying the lignin derivative from the liquid medium, and
- recovering the lignin derivative from the metal oxide under an alkali condition to prevent alkali degradation of the lignin derivative,
- wherein the lignin derivative has a 1,1-diphenylpropane unit and/or a unit derived from the 1,1-diphenylpropane unit.
A method for producing a lignin derivative comprising:
- contacting the lignin derivative with a metal oxide in a liquid medium,
- separating the metal oxide carrying the lignin derivative from the liquid medium, and
- recovering the lignin derivative from the metal oxide under an alkali condition to prevent alkali degradation of the lignin derivative,
- wherein the lignin derivative has a 1,1-diphenylpropane unit and/or a unit derived from the 1,1-diphenylpropane unit.
A method of purifying a lignin derivative, the method comprising:
- contacting the lignin derivative with a metal oxide in a liquid medium,
- separating the metal oxide carrying the lignin derivative from the liquid medium, and
- recovering the lignin derivative from the metal oxide under an alkali condition to prevent alkali degradation of the lignin derivative,
- wherein the lignin derivative has a 1,1-diphenylpropane unit and/or a unit derived from the 1,1-diphenylpropane unit.
A method for recovering a lignin derivative from a composite material containing thereof, the method comprising:
- contacting the lignin derivative with a metal oxide in a liquid medium
- separating the metal oxide carrying the lignin derivative from the liquid medium, and
- recovering the lignin derivative from the metal oxide under an alkali condition to prevent alkali degradation of the lignin derivative,
- wherein the lignin derivative has a 1,1-diphenylpropane unit and/or a unit derived from the 1,1-diphenylpropane unit.
Dependencies are inferred from the claim text.