Ⅳ.单词拼写（共10小题.计10分）根据下列句子及所给字母提示,在句子右边的横线上写出空缺处各单词的正确形式。76.As he was very thirsty,he d<sub> a lot of water. 76.<sub>77.There being no lift,we had to climb six...Ⅳ.单词拼写（共10小题.计10分）根据下列句子及所给字母提示,在句子右边的横线上写出空缺处各单词的正确形式。76.As he was very thirsty,he d<sub> a lot of water. 76.<sub>77.There being no lift,we had to climb six f<sub> of stairs. 77. __展开更多
Purification of original crude glycerol obtained from biodiesel production was conducted in a laboratory scale equipment by means of a combined chemical and physical treatment method based upon repeated cycles of acid...Purification of original crude glycerol obtained from biodiesel production was conducted in a laboratory scale equipment by means of a combined chemical and physical treatment method based upon repeated cycles of acidification of liquid phase to the desired pH value by using 5.85% H3PO4 solution for pH value adjustment, and the mixture was kept at 70 ℃ for 60 rain to make phase separation for obtaining a glycerol-rich middle phase. The yield of crude glycerol reached 81.2%. Subsequently, upon reaction of the obtained glycerol phase with 0.03% of sodium oxalate at 80 ℃ for 30 min the impurity removal rate was equal to 19.8%. The fraction boiling between 164 ℃ and 200 ℃ was collected by vacuum distil- lation followed by decolorization with 2% of active carbon at 80 ℃ for two times to yield the product glycerol with an ac- ceptable purity of 98.10%.展开更多
文摘Ⅳ.单词拼写（共10小题.计10分）根据下列句子及所给字母提示,在句子右边的横线上写出空缺处各单词的正确形式。76.As he was very thirsty,he d<sub> a lot of water. 76.<sub>77.There being no lift,we had to climb six f<sub> of stairs. 77. __
基金the financial support from Scientific Research Foundation for Doctoral Program of Liaoning Province(20081104)
文摘Purification of original crude glycerol obtained from biodiesel production was conducted in a laboratory scale equipment by means of a combined chemical and physical treatment method based upon repeated cycles of acidification of liquid phase to the desired pH value by using 5.85% H3PO4 solution for pH value adjustment, and the mixture was kept at 70 ℃ for 60 rain to make phase separation for obtaining a glycerol-rich middle phase. The yield of crude glycerol reached 81.2%. Subsequently, upon reaction of the obtained glycerol phase with 0.03% of sodium oxalate at 80 ℃ for 30 min the impurity removal rate was equal to 19.8%. The fraction boiling between 164 ℃ and 200 ℃ was collected by vacuum distil- lation followed by decolorization with 2% of active carbon at 80 ℃ for two times to yield the product glycerol with an ac- ceptable purity of 98.10%.
