[Production Version] Daily Question 2018-2-22 (Short Answer)

Classified by operation mode: batch distillation, continuous distillation. Classified by operating conditions: pressure distillation, atmospheric distillation, and vacuum distillation. Classified by principle: normal distillation, special distillation.

Classified by operation mode: batch distillation, continuous distillation. Classified by operating conditions: pressure distillation, atmospheric distillation, and vacuum distillation. Classified by principle: normal distillation, special distillation.

There are various types of distillation towers. (1) Classified by material. Classified by material, there are three common types: quartz glass distillation towers, stainless steel distillation towers, and stainless steel with PTFE lining distillation towers. ① Quartz glass distillation tower. A quartz glass distillation tower refers to a distillation tower made of quartz glass material. Quartz glass has excellent corrosion resistance; the use of quartz glass distillation towers for the distillation and purification of silicon tetrachloride or trichlorosilane results in less contamination of the equipment, allowing for the production of higher-purity products. Therefore, quartz glass sieve tray towers are widely used in the production of electronic materials in our country. Generally, for quartz glass distillation columns with high productivity, a stainless steel column bottom is still used. If the quality requirements for the distillation product are too high and stainless steel reactor vessels cannot meet them, the approach of using one tower with multiple vessels can be employed to solve the issue. ② Stainless steel distillation tower. With the rapid development of the electronics industry, there is an increasing demand for silicon materials, which places higher requirements on the materials used in distillation towers. Due to the fragile nature of quartz glass, which limits its use to the manufacture of small distillation columns, it is difficult to meet the demands of large-scale industrial production; as a result, quartz glass distillation columns have gradually been replaced by high-purity stainless steel. ③ Stainless steel polytetrafluoroethylene-lined distillation tower. To overcome the drawback of stainless steel distillation columns being prone to contamination by the substances being purified, distillation columns lined with stainless steel and polytetrafluoroethylene were developed. Because polytetrafluoroplastic is sensitive to silicon tetrachloride or silicon trichlorohydride...

Classified by operation mode: batch distillation, continuous distillation. Classified by operating conditions: pressure distillation, atmospheric distillation, and vacuum distillation. Classified by principle: normal distillation, special distillation

Based on the operation mode, it is divided into batch distillation and continuous distillation. Based on operating conditions, it is divided into: pressure distillation, atmospheric distillation, and vacuum distillation. Classified by separation principle: normal distillation, special distillation

Intermittent distillation, continuous distillation. Classified by operating conditions: pressure distillation, atmospheric distillation, and vacuum distillation. Classified by principle: normal distillation, special distillation.

Classified by operation mode: batch distillation, continuous distillation. Classified by operating conditions: pressure distillation, atmospheric distillation, and vacuum distillation. Classified by principle: normal distillation, special distillation.

Based on the operation mode, it is divided into batch distillation and continuous distillation. Based on operating conditions, it is divided into: pressure distillation, atmospheric distillation, and vacuum distillation. Classified by separation principle: normal distillation, special distillation

Based on the operation mode, distillation can be divided into continuous distillation and batch distillation； Based on the number of components in the mixture, it can be divided into binary distillation and multi-component distillation ； Based on whether additives that affect the gas-liquid equilibrium are added to the mixture, it can be divided into normal distillation and special distillation (including extractive distillation, azeotropic distillation, and salting-in distillation). If a chemical reaction is involved, it is called reactive distillation. In non-ferrous metal metallurgy, distillation is successfully used for the refining of crude zinc. In industry, metals are also often converted into chlorides and then distilled

Based on the operation mode, it is divided into batch distillation and continuous distillation. Based on operating conditions, it is divided into: pressure distillation, atmospheric distillation, and vacuum distillation. Classified by separation principle: normal distillation, special distillation