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；
Meanwhile the refining process was improved, using crystallization from petroleum-benzene instead of high vacuum distillation. The process was simplified for the benefit of industry production.
同时改进了精制工艺，用石油醚-苯进行结晶代替高真空蒸馏，简化了工艺，有利于工业化生产。
The three main methods for high purity zinc preparation, including electrolytic method, vacuum distillation, zone refining, are summarized and compared in this paper.
本文对目前高纯锌的三种主要制备方法(电解法、真空蒸馏法、区域熔炼法)进行了综述和比较。
Mixed diisopropyl benzene was chose as the materials to compose high purity resorcinol by shape selective catalysis decomposition and vacuum distillation.
以混合二异丙苯为原料经择形催化裂解和减压蒸馏，制备了高含量的间二异丙苯。
The results showed that the heavy metal cadmium could be effectively separated by vacuum distillation to produce high purity cadmium (>99%).
实验结果表明：利用真空蒸馏可以实现镍镉电池中镉与其它金属的有效分离，并得到纯度大于99%的金属镉；
The molecular distillation (short-path distillation or unobstructed distillation) is a special separation technique of liquid-liquid and a special distillation technique under the high vacuum.
分子蒸馏是一种在高真空下进行的特殊蒸馏技术。
Analyze features of corrosion of pipeline for high acidic crude oil of atmospheric and vacuum distillation unit, probe major principle for selection of piping material.
分析加工高酸值原油常减压蒸馏装置管道腐蚀的特点，探讨其主要管道的选材原则。
The vacuum membrane distillation units, the device and the method have the advantages of high heat recovery rate, energy saving, high equipment integration degree, low operation cost and the like.
本发明的减压膜蒸馏组件单元及其装置和方法具有热回收率高、节能、设备集成化程度高、操作成本低等优点。
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。
A vacuum distillation method and a vacuum distillation device are disclosed, for inhibiting frothover in a distillation boiler and recycling high pure solvent in free of impurities.
提供一种减压蒸馏方法以及减压蒸馏装置，其抑制蒸馏锅内的突沸，回收不含杂质的高纯度溶剂。
The invention can be used as a heating vacuum reaction furnace which can carry out the continuous production or a vacuum distillation furnace. The production efficiency is high.
它既可作为一种可连续生产的加热真空反应炉，也可以用作真空蒸馏炉，且生产效率较高。
The invention can be used as a heating vacuum reaction furnace which can carry out the continuous production or a vacuum distillation furnace. The production efficiency is high.
它既可作为一种可连续生产的加热真空反应炉，也可以用作真空蒸馏炉，且生产效率较高。
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