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- The test is a research on the extraction of distilling essential oil from leaves by comparing efficiency of extraction by three reagents.Those are ether, ethyl acetate and ether from Petroleum. 本试验对树叶中提取精油萃取液进行了研究,通过三种不同试剂萃取,对水蒸汽蒸馏产物所得的萃取率来研究其适合度。
- A chemical derived from petroleum or natural gas. 石油化学制品从石油或天然气中提炼出的化学产品
- Substitutes for rubber can be made from petroleum. 橡胶的代用品可由石油制取。
- Of, relating to, or derived from petroleum. 汽油的汽油的、与汽油有关的或从汽油中提取的
- Methods The extracted liquid with petroleum ether from the geochemical samples in the north of Shaanxi was spectrally analyzed by using the optimized measurement condition. 方法用优化后的条件对陕北地区化探样品中芳烃的石油醚萃取液进行了光谱分析。
- On contrast, the anti-feeding effects of the extracts from petroleum ether and ethyl acetate to small vegetable-moth are smaller than those to armyworm. 但对小菜蛾而言，石油醚萃取物和乙酸乙酯萃取物的拒食作用不如对粘虫作用明显。
- ether from petroleum 石油醚
- At that time, a method was found to make kerosene fuel from petroleum. 在当时，一种从石油中提取煤油燃料的方法被发明出来了。
- A pitch mesophase can be prepared from petroleum pitch andcoal tar pitch. 从石油沥青和煤沥青中制取沥青中间相物质。
- Recent advances in the direct synthesis of dimethyl ether from syngas in three-phase reactors are reviewed with emphasis placed on the cases in China. 综述了国内外特别是国内三相床反应器中由合成气直接合成二甲醚的研究和开发新进展。
- The chemical power released from petroleum and coal is of great economic value . 从石油和煤中释放出来的化学能有重大的经济价值。
- Methods:The extracted mixture of Veronicastrum caulopterum(Hance)Yamazaki from petroleum ether,purified water and 95% ethanol were studied by test tube method. 方法:采用试管法,对四方麻的石油醚、水、95%25乙醇提取物进行研究,通过多种指示剂和显色剂的沉淀反应或颜色反应,初步推断四方麻中可能含有的化学成分。
- Chemical equilibrium in direct synthesis of dimethyl ether from syngas was calculated and analyzed by using an appropriate thermodynamic model. 选用合适的热力学模型,对合成气直接合成二甲醚的反应进行了化学平衡分析。
- In this paper,the preparation of 1,2-cyclohexanediol diglycidyle ether from 1,2-cyclohexanediol with epichorohydrin was discussed. 对用1,2-环己二醇制备1,2-环己二醇二缩水甘油醚做了较全面的探讨。
- How to get more gasoline from petroleum is a problem which has been explored for a long time . 如何从石油中提取更多的汽油是一个经长期探索的问题。
- Any of three colorless,flammable isomeric hydrocarbons,C5H12,derived from petroleum and used as solvents. 戊烷有三种同分异构体的无色可燃烷烃，C5H12，从石油中提炼，可用做溶剂
- A flammable gas,CH3CH: CH2,derived from petroleum hydrocarbon cracking and used in organic synthesis. 丙烯一种易燃气体，化学式为CH3CH：CH2，提炼于石油的碳氢化合物裂化蒸馏，用于有机合成
- A flammable gas, CH3CH:CH2, derived from petroleum hydrocarbon cracking and used in organic synthesis. 丙烯一种易燃气体，化学式为CH3CH：CH2，提炼于石油的碳氢化合物裂化蒸馏，用于有机合成
- As the name implies, petrochemicals are chemicals made from petroleum, from hydrocarbons found in the latter. 顾名思义，石油化工产品是从石油中，从石油的碳氢化合物中提炼出来的化学制品。
- Some scientists believe it possible to create food from petroleum which may be more healthful than any food we eat now. 有些科学家相信有可能从石油中提炼食物,这种食物可能比我们现在吃的食物更富有营养。
