Experiment result of brown ring, diphenylamine and Kjeldahl method confirm that SN accelerate the esterification of BTCA with cellulose, and without consumption and character change itself in the whole reaction.

• 并且由棕色环、二苯胺和克氏定氮实验结果表明：硝酸钠在反应前后既没有消耗也没有发生性质的改变，只是在体系中起到了加速BTCA与纤维素酯化反应速率的作用。