By microwave irradiation, the citral was obtained from Litea cubeba fruits, the yield was risen in average 36.5% than by traditional distillation in a current of steam.
采用微波辐照技术从山苍子中提取制备柠檬醛，使山苍子精油的提取率较传统的直接水蒸气蒸馏法平均提高36.5%以上。
A black or dark brown shale containing hydrocarbons that yield petroleum by distillation.
一种黑色或深褐色的页岩，含有碳氢化合物，通过提炼可产石油。
This article is to be discussed at a factory for the production by decompressing distillation process to extract onion oil, in order to improve the yield and quality.
本论文拟探讨一条适宜于工厂化生产的减压蒸馏提取洋葱油的工艺，以提高洋葱油的得率和质量。
Experiment results indicated that the vacuum distillation by using two flask vacuum collectors can make product yield higher.
实验证明采用双瓶采集的真空间歇精馏操作能得到较高的产品收率。
The product was purified by distillation in vacuum. The total yield was 87.4% based on PCl_3.
产物通过减压蒸馏纯化，以三氯化磷计，总收率达87.4%。
The product was purified by distillation in vacuum. The total yield was 87.4% based on PCl_3.
产物通过减压蒸馏纯化，以三氯化磷计，总收率达87.4%。
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