Abstract In order to improve students’ ability of experimental innovation and independent problem-solving, further expand their knowledge, cultivate students’ awareness of environmental protection and team spirit, through open experiments, let students participate in the design of the experiment, the selection of experimental materials and equipment, waste recovery and reuse, data analysis and result discussion. In the open experiment, 1,4-butanediol aqueous solution was used as solvent to extract lignin from carrot by high boiling solvent (HBS). The optimum extraction conditions were explored and the reasons were analyzed. The results show that when the dry carrot powder is put into the aqueous solution of 1,4-butanediol with a mass fraction of 80%, the lignin yield can reach 17.14% after cooking for 2 hours at 210 ℃ and the ratio of material to liquid is 1:6, and the recovered high boiling alcohol and water can be recycled. The open experiment is not only of reference significance for the extraction of carrot lignin by high boiling solvent, but also provides a new idea for the teaching reform of environmental chemistry experiment in colleges and universities.
TANG Xiao-Hong. Open Experimental Study on Extraction of Carrot Lignin by High Boiling Solvent[J]. Chinese Journal of Chemical Education, 2024, 45(18): 91-97.
