从杉木油中分离柏木醇的研究

Study on separation cedrol from Chinese fi r oil

采用减压精馏技术和结晶技术相结合从杉木油中分离柏木醇。结果表明：采用变回流比操作，回流比为1～7，系统压力为2．27kPa，塔釜温度小于225℃，高沸点馏分收集阶段塔顶温度为164～166℃，高沸点馏分中柏木醇含量为58％左右，柏木醇的收率为90％左右。溶剂结晶法从高沸点馏分中分离柏木醇的最佳工艺为：结晶时间为5h、结晶终温为4℃、乙醇浓度为85％、料液比为1：2，此时，柏木醇的纯度为92．81％，柏木醇的收率为79．03％。经重结晶后，柏木醇纯度达到98％以上。

Vacuum rectification and crystallization were used to separation cedrol from Chinese fir oil. The results show that the reflux ratio was 1-7, the system pressure was 2.27 kPa, the temperature of tower bottom was below 225 ℃ ; In the optimum condition, the temperature of tower top was between 164 and 166 ℃ , the yield rate of cedrol reached 90% and the content of cedrol reached 58%. The optimum technics conditions separating cedrol from the high boiling point fractions are as follows： crystallizing temperature 4℃ ethanol concentration 85%, solid-liquid ratio 1 ： 2. With the optimum technics, the yield of cedrol reached 79.03% and the purity of cedrol reached 92.81%. After recrvstallization, the Duritv of cedrol reached 98%.