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。
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