Apparatus and method used for purifying chloropentafluorobenzene

Abstract

The invention discloses an apparatus and a method used for purifying chloropentafluorobenzene. A double-crystallizer type fusion crystallization apparatus is employed, a raw material is firstly subjected to fusion crystallization in a crystallizer, and then the obtained mother liquor is transferred to another crystallizer for mother-liquid crystallization recovery. The method for purifying chloropentafluorobenzene by utilizing the apparatus comprises the following steps: (a) analyzing impurities; (b) designing a purification scheme; (c) preparing purification; (d) measuring a freezing point; (e) feeding; (f) crystallizing; (g) discharging a first mother liquor; (f) performing first-stage sweating; (i) performing first-stage discharging; (j) performing crystallization recovery on the first mother liquor; (k) performing second-stage sweating; and (l) performing second-stage discharging. According to the method, fully analysis is performed on the chloropentafluorobenzene raw material before fusion crystallization, the physical properties and the chemical properties of chloropentafluorobenzene and impurities thereof are mastered, thereby facilitating a worker to suit the remedy to the case and design a fusion crystallization technology matched with the physical and chemical properties, and the obtained product is high in purity, and great economic benefit is provided.

Description

technical field [0001] The invention relates to a device and method for purifying pentafluorochlorobenzene. Background technique [0002] Pentafluorochlorobenzene is a transparent, colorless, clear liquid with a pungent odor. It has the following physical properties: [0003] [0004] During the preparation process, due to the accompanying side reactions, the pentafluorochlorobenzene product often contains some impurities, and pentafluorochlorobenzene needs to be refined before it can be put into use. In the actual production process, due to the generated C 8 f 10 The boiling points of other impurities are very close to those of chloropentafluorobenzene. Purification of chloropentafluorobenzene by rectification method not only consumes a lot of energy, but also takes a lot of time and effort. Moreover, the purity of the refined product is not ideal, and it is difficult to meet the use requirements of the product. Therefore, the method of melting and crystallization is...

AI Technical Summary

Problems solved by technology

In the actual production process, due to the generated C 8 f 10 The boiling point of impurities such as pentafluorochlorobenzene is very close to that of chloropentafluorobenzene. Purification of pentafluorochlorobenzene by rectification method not only consumes a lot of energy, is time-consuming and laborious, but also the purity of the refined product is not ideal, and it is difficult to meet the requirements of the product.

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