Method of producing a softwood lignin derivative

摘要

The present invention relates to softwood lignin derivatives having an aliphatic hydroxyl content of from about 2.5 mmol/g to about 7 mmol/g lignin, and the preparation method thereof. The preparation method comprises: pulping a fibrous biomass, heating the biomass, maintaining the elevated temperature for 1 minute or longer, separating the cellulosic pulp to form a lignin-rich material, and recovering derivatives of native lignin. The lignin derivatives have a desired antioxidant activity characterized by radical scavenging index (RSI). Another aspect of the invention relates to compositions comprising the softwood lignin derivative. Another aspect of the invention relates to a use of the softwood lignin derivatives comprising incorporating the softwood lignin derivatives into polymer compositions.

主权项

1. A method of producing a softwood lignin derivative, comprising:
a. pulping a fibrous biomass; b. heating the biomass; c. maintaining the elevated temperature for 1 minute or longer; d. separating the cellulosic pulp to form a lignin-rich material; and e. recovering derivatives of native lignin, wherein the derivatives have an aliphatic hydroxyl content of from 2.5 mmol/g to about 7 mmol/g, phenolic hydroxyl content of from about 2 mmol/g to about 8 mmol/g, and a normalized RSI of 10 or greater;wherein the pulping process is selected from the group consisting of: steam explosion, dilute acid hydrolysis, ammonia fiber expansion, autohydrolysis, soda pulping or modifications thereof, and organosolv process.