查询词典 petroleum ether

Bellflower to soil and acetone in petroleum ether 10-Soxhlet extraction in the extraction, extracts of the scale centrifuge tube in a concentrated sulphuric acid purification.

土壤和桔梗以石油醚十丙酮在索氏提取器中提取，提取液在刻度离心试管中以浓硫酸净化。

The products were recrystallized by petroleum ether. The purity of 1,2 bis chlormethyl benzol was beyond 98%.

考察了邻二-苯在ZnSO4 催化剂存在下反应条件对合成邻苯二甲醛的影响。

The content of carotenoid and petroleum ether extract reduced at three months of aging and then increased.

类胡萝卜素和石油醚提取物含量在陈化三个月时降低，之后上升。

Chloropicrin in vegetables and fruits was determined by gas chromatography with ECD after extracted with petroleum ether under ultrasonic.

采用石油醚对蔬菜、水果样品进行超声波提取，以气相色谱电子捕获检测器测定氯化苦残留。

Also the molecular structure and functional effects of this active component were studied in detail. 1 Extraction, separation, purification and structural identification of the functional component in Chufa After initial handling of waste slurry to solid powder, ethanol was used to lixiviate it followed by the extraction with petroleum ether,ethyl acetate,n-butyl alcohol one by one, the polarity of three organic reagents being changed from low to high.

荸荠功能因子的提取、分离、纯化及结构鉴定以马蹄粉厂产粉废浆为原料，经过实验室初处理成固态原料粉后，用乙醇浸提，再将浸提物以水悬浮，依次通过极性从小到大的石油醚、乙酸乙酯、正丁醇三种有机溶剂两相萃取分部，并以金黄葡萄球菌、枯草芽孢杆菌和致病大肠杆菌为指示菌，检测上述各部分提取物的功能效果。

Cottonseed oil and cottonseed meal with good quality could be obtained from cottonseed kernel by a two - phase extraction system which was composed of petroleum ether and methanol.

采用石油醚和甲醇的双液相溶剂浸取棉仁可以得到高质量的棉籽油和棉籽粕，棉仁中的棉酚大部分被甲醇溶解。

The appropriate temperature of diazotization was-10～-5℃,and the diazotizating fluoborate was decomposed in petroleum ether to get 2-chloro-3-fluoropyridine with 64% yield.

以2-氯-3-氨基吡啶为原料，在40%的氟硼酸溶液中，采用饱和的亚硝酸钠为重氮化剂，在-10~-5℃下进行重氮化反应制得重氮盐，在石油醚中热分解得到2-氯-3-氟吡啶，收率为64%。

Electropolar solvent such as THF may destroy the polyetherimide layer,while non-electropolar solvent such as petroleum ether cannot solve vinyl acetic acid cobalt.

极性溶剂如四氢呋喃会溶解PEI层，而非极性溶剂如石油醚又不能溶解丁烯酸钴。

The optimun conditions were pressure 300 Mpa,temperature 45 celsius degree,extraction time 3h and the entrainer was petroleum ether.

确定工艺条件为：压力30MPa，萃取温度45℃，萃取时间3 h，携带剂为石油醚。

Object: The antimicrobial effects of the water, 60% alcohol, 90% alcohol extract and petroleum ether, ethyl acetate, n-butanol components from Pomegranate rind against 3 kind of pathogenesis bacterial and 14 kind of epiphyte were accomplished.

目的：对石榴皮的水、60%乙醇、90%乙醇提取物以及石油醚、乙酸乙酯、正丁醇萃取物对3种细菌和14种真菌的体外抗菌试验进行了研究。

He and Nina moved to California and lived at 2005 Ivar Street, Apt.

他和Nina搬到加州，并在2005年伊瓦尔街，公寓生活。

Droperidol （ potently inhibits transfected HERGchannels and this is the probable mechanism for QT prolongation.

氟哌利多有效地抑制了转染的 HERG 钾通道，可能是 QT 间期延长的机制。