查询词典 distillation

The yield, chemical components and relative contents of essential oil extracted from Eupatorium adenophorum Spreng by Soxhlet extraction and steam distillation were compared. The volatile chemical constituents of essential soil extracted were analyzed by Gas Chromatography-Mass Spetrometry. The results showed that the constituents of the volatile from the same plant and the relative contents were significantly different due to different extraction methods.

采用索氏提取器及水蒸气蒸馏两种方法对采于不同时间、不同产地的紫茎泽兰Eupatorium adenophorum Spreng挥发性成分进行了提取，比较了两种方法的得油率、化学组成及其相对含量；采用GC-MS联用技术对其中的挥发性成分进行了分析。

In order to minimize the pollution of the environment with waste acids and/or waste acidic salt solution, following measures were taken:(1) Instead of using excess sulfuric acid, sulfonation reaction was carried out in the presence of excess toluene and the water produced during the sulphonation was removed by azeotropic distillation.

在CLT酸生产中，为了使废酸和酸性废盐水对环境的污染减少到最低程度，采取了如下的措施：(1)与使用过量硫酸相反，磺化反应是在过量甲苯的存在下进行，同时用共沸蒸馏方法移出了磺化过程中产生的水。

A desulfurization method is proposed for the removal of sulfur compounds from FCC gasoline by alkylation reaction of thiophenic sulfur with olefins over acid catalysts, and the higher boiling sulfur-containing products are removed by fractional distillation.

选择以噻吩的甲基取代衍生物(包括 2-甲基噻吩、3-甲基噻吩及 2，5-二甲基噻吩)与异丁烯的烷基化反应为模型反应，考察了经三氯化铝气相固载法改性的 CT175 树脂催化剂催化噻吩的甲基取代衍生物与烯烃的烷基化反应性能。

The number of components in steam distillation extraction for chafu was about 13,mainly containing Thymyl methyl ether,Beta-selinene and so on,which occupied over 18% in all components.

水蒸气蒸馏法和超临界萃取测定柴胡挥发油成分比较发现，鉴别峰的数量相对较少，水蒸汽蒸馏法提取的柴胡挥发油中鉴定出13个主要成分，占挥发油组分的18％以上，主要成分为百里基甲基醚、β—蛇床烯等；超临界萃取的柴胡低极性成分中鉴定出9个主要成分，占低极性组分的20％以上。

The extracts of Torreya grandis epispem were obtained by both supercritical CO2 extraction and steam distillation, and their chemical compositions were analyzed by GC-MS qualitatively and quantitatively.

分别采用超临界CO2萃取法和水蒸气蒸馏法提取香榧外种皮提取物，并采用GC-MS分析手段对提取物的化学组成进行了定性和定量测定。

Methods 0mit and alter some work procedure including distillation,store reagent that show color,either the order of reagent procedure or recycle of the waste trichloromethane.

方法有条件的简化蒸馏步骤、显色剂储存使用、改变显色剂与氯仿的加入顺序、氯仿废液回收循环使用。

Taking trimethylbenzene precise distillation for example,a new heat integration technology for energy saving was put forward.

以三甲苯精密精馏过程为实施案例，对多塔分离过程提出了热集成节能工艺。

Results showed that both baffled and unbaffled membrane contactors gave better, more productive separations than traditional packing in distillation, such as excellent Sulzer Gauze BX structured packing.

档板使气体流向发生改变，产生局部运行的错流状态，从而可以有效地减少目前实验中经常发现的壳程沟流现象，并促进管内液相流动以及两相沿膜的传质，提高膜填料的分离效果。

Rhododendron dauricuml ; Simultaneous distillation and extraction; Essential oil ; GC/MS ; Unblended cigarette ; Flavoring

满山红；同时蒸馏萃取；挥发油； GC/MS分析；单料烟；加香

The volatile oil of C. uncinata was extracted by steam distillation and its chemical composition was analyzed and identified by gas chromatography-mass spectrometry.

方法］采用水蒸汽蒸馏法提取柱果铁线莲挥发油，通过气相色谱-质谱联用技术对挥发油的化学成分进行分析、鉴定。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。