2010•Anhui nongye kexueRequires access
Study on Separation of Cellulose and Lignin in Straw by Lactic Acid
Liyan Zhu
Open publisher page 0 citations
Abstract
[Objective] The study was to provide the technical guidance for further use of cellulose and lignin in straw.[Method] The cellulose and lignin in straw were separated by lactic acid.The influence of temperature on separation effect was studied,and the composition and properties of acid treated cellulose in different temperatures were analyzed.[Results] When the temperature was below 115 ℃,the yield rate of acid treated fiber was decreased rapidly with the increase of temperature.The yield rate of lactic acid lignin was firstly increased and then decreased with the increase of temperature,but when the temperature was above 130 ℃,the yield rate of lactic acid lignin was decreased.The content of cellulose in acid treated fiber was firstly increased and then decreased with the increase of temperature,and the cellulose content was the highest at 125 ℃.When the temperature was below 110 ℃,the content of lignin in acid treated fiber showed decreasing trend with the increase of temperature,when temperature was higher than 110 ℃,the increase of temperature had little effect on lignin content.The analysis results of infrared spectrum showed that the isolated lactic acid lignin contained a lot of polar groups.[Conclusion] Under the experimental condition in this study,the optimum preservation temperature was 125 ℃.