沸程

用气相色谱法同时测定石油苯的结晶点、密度、沸程及纯度

Simultaneous Determination of Crystallization Point . Density . Boiling Range and Purity of Petroleum Benzene by Gas Chromatography

研究中还找到一个简便有效的对β-胡萝卜素的提取方法，选用盐酸-热处理法进行细胞破壁，并选用沸程为60～90℃的石油醚进行萃取。

In the extracting study , it has showed hydrochloric acid-heat treatment is a simple , convenient and effective extracting methods is which was used to destroy the cell wall , and the extracting organic solvent is petroleum ether whose boiling range is 60 ~ 90 ℃ .

GB/T615-1988化学试剂沸程测定通用方法

Chemical reagent & General method for the determination of distillation range

GB/T7534-1987工业用挥发性有机液体沸程的测定

Volatile organic liquids for industrial use & Determination of boiling range

一种预测重质油沸程的方法

A method for prediction of distillation range of heavy oils

结果显示，随着馏分沸程的增加，硫、氮等杂原子含量以及碱性氮和非碱性氮含量的增加。

The results showed that the amounts of sulfur , total nitrogen , basic nitrogen and non-basic nitrogen increased with the fraction boiling ranges .

环烷酸的分子量分布情况与馏分的沸程趋势相一致，随着馏分变重、酸值增加，环烷酸的平均分子量增大、分布变宽、碳数范围增大；

As fraction becomes heavier and acid value increases , the average molecular weight of naphthenic acid increases , its distribution gets wider and the carbon number range increases .

催化剂内部的结焦前驱物主要为芳香族碳氢化合物，这些化合物的沸程范围在350~650℃。

The results indicates that precursors of coke deposited inside the pore of the molecular sieve are mainly aromatic hydrocarbons with the boiling points ranging from 350 ° C to 650 ° C.

由于流经稳定塔重沸器壳程的介质中含有大量硫化物，致使20号钢管束腐蚀严重，最短的仅运行7天即发生了泄漏。

As the media flowing through the shell pass of the stabilizer reboiler contained large amount of sulfides , the 20 # steel tubes were severely corroded and some tubes leaked only 7 days after the operation .

萃取精馏主要用于分离共沸物和近沸程物系。

Extractive distillation is mainly used to separate azeotrope and components of narrow boiling range .