Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1975-02-21
1978-08-15
Lieberman, Allan
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
106163R, 260124R, C07G 100, C08H 502, C08L 9700
Patent
active
041071115
ABSTRACT:
This invention relates to a three-dimensional, aromatic, sulfur-containing polymer based on lignin. The polymer is characterized in that it is amorphous, practically insoluble in water and conventional organic solvents; it contains thioether bonds and possibly sulfoxide and/or sulfone groups formed by oxidizing of thioether bonds, and possibly carbon-carbon bonds between aromatic rings and/or side chains and possibly other bonds typical to lignin, depending on reaction conditions. Its thermostability is at least 200.degree. C.; and it has been obtained from lignin which is dissolved or undissolved, chlorinated or unchlorinated, purified or containing other components of spent pulp liquor, by heating at about 160.degree.-350.degree. C., preferably in an atmosphere substantially of nitrogen and/or water vapor, for a time sufficient to form the polymer, with sulfur and/or inorganic or organic sulfur compounds so that degradation products of lignin, containing aromatic rings, or corresponding aromatic compounds, with an activating substituent have possibly been added.
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Hortling Bo
Lindberg Jarl Johan
Turunen Johannes
Lieberman Allan
Rauma-Repola Oy
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