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- Keywords nafronyl oxalate;impurity;HPLC;column chromatography;high vacuum distillation;single crystal structure; 关键词萘呋胺酯草酸盐;杂质;HPLC;柱层析;高真空蒸馏;单晶结构;
- high vacuum distillation 高真空蒸馏
- The refined product with high purity is obtained by vacuum distillation of crude benzal chloride. 将制得的苄叉二氯粗品进行真空精馏得到高纯度的精品;
- The whole apparatus operates under high vacuum. 整个装置在高真空下运转。
- Inflammable ether was not used and vacuum distillation was omitted. 不使用易燃性乙醚作溶剂,省略高真空蒸馏。
- Methods: Second-hydrogenation, distillation under high vacuum, recrystallization, hydrolyza-tion under acid condition, and oxidation. 方法:再次氢化、酯化物高真空蒸馏、成盐后重结晶、酸性条件下水解、氧气破坏性氧化。
- The new liquid distributor has been already applied in revamping of the washing zone in crude vacuum distillation tower with high temperature,small flowrate,dirt and easy-coking material. 新型液体分布器已应用到温度高、液量小、物系脏、易结焦的原油减压蒸馏塔洗涤段的改造中。
- The resultsshow that it is a valid way for making high - pure metal terbium adopting preducing fluoride with low temperature and vacuum distillation, and we engage in investigation to influence facts. 结果表明:采用低温氟化,真空蒸馏是制备高纯金属铽的有效方法,并对其影响因素作了探讨。
- Some methods for high purity indium preparation are described, including sublimation, zone melting, vacuum distillation, metal organics, ionicexchange, extraction and electrolytic refining. 介绍了由粗铟生产制备高纯铟的几种方法,包括升华法、区域熔炼法、真空蒸馏法、金属有机物法、离子交换法、萃取法、电解精炼法等。
- To preserve(food,for example) by rapid freezing and drying in a high vacuum. 使冷冻干燥通过在高度真空状态下迅速冷冻并干燥来保存(如食物)。
- Setting up the vacuum distillation apparatus for the Essential Oils experiment. (Photo by Chemistry laboratory staff. 为了做精油实验而搭建的真空蒸馏装置(摄影:化学实验室职员)。
- To preserve(food, for example) by rapid freezing and drying in a high vacuum. 使冷冻干燥通过在高度真空状态下迅速冷冻并干燥来保存(如食物)
- The purifcation of Dy, Ho and Er metals has been studied by the method of vacuum distillation. 本文研究了金属镝、、的真空蒸馏提纯效果。
- In high vacuum state,the damp water in leather can be largly pumped. 由于皮张处于高真空状态,水分抽出量增大,可缩短干燥时间令产量上升;
- The cubage of the tube is small and high vacuum will be got very quickly. 计算结果表明:二极管的工作场强低于真空闪络场强;
- Fatty acid is made from spent material in production of ricinus oil by acidification, washing, and vacuum distillation. 蓖麻油下脚料经酸化水洗,减压蒸馏等工序分离制取脂肪酸。
- It is a guide for the vacuum deep cut revamping on atmospheric and vacuum distillation unit. 结果表明对常减压装置减压深拔技术改造有一定的指导意义。
- This paper discuss the technology of separating zinc-tin alloy to recover zinc and tin by vacuum distillation. 研究了真空蒸馏法分离废杂锌锡合金回收锌锡金属的工艺。
- The combined vacuum distillation and melt crystallization technology was used to purify DDHI from artificial musk. 通过减压精馏-熔融结晶耦合技术研究提高人造麝香(DDHI)含量的原理和工艺流程。
- Atmospheric distillation,vacuum distillation and azeotropic distillation processes were used to separate 1,2-dichloropropane from the waste liquor. 采用常压精馏、减压精馏、共沸精馏工艺分离环氧丙烷生产废液中的1,2-二氯丙烷。