Gradient cooling falling film dynamic crystallizer and falling film crystallization separation method of mixture

Abstract

Aiming at solving the problems of the existing dynamic crystallization device, the invention provides a gradient cooling falling-film dynamic crystallizer and a falling-film crystallization separationmethod of a mixture, and belongs to the technical field of chemical equipment. The gradient cooling falling film dynamic crystallizer sequentially comprises a feeding unit, a falling film crystallization unit and a discharging unit from top to bottom, the upper part of the feeding unit is a slow flow groove, and the lower part is a raw material groove; a plurality of falling film pipes are arranged in the falling film crystallization unit, jacketed pipes sleeve the outer walls of the falling film pipes, and circulating water inlets and circulating water outlets are formed in the side walls ofthe falling film pipes; the falling film crystallization unit base is fixedly connected with the top of the discharging unit, and a material outlet is formed in the side wall of the lower portion ofthe falling film crystallization unit. By arranging the flow slowing groove, the stability and uniformity of materials entering the dynamic crystallizer are achieved; crystallization and scale deposition in the initial stage are avoided by improving the uniformity of material spraying on the inner wall of the falling film tube pass; and the crystallization efficiency of the tube pass is improved by improving the heat exchange efficiency.

Description

technical field [0001] The invention belongs to the technical field of chemical equipment, and in particular relates to purification equipment and a purification method for easily crystallized substances in petrochemical and coal chemical industries. Background technique [0002] In the production of refined naphthalene and refined anthracene in the petrochemical industry and coal chemical industry, there are substances such as thioindenes, methylindene, and phenanthrene with similar boiling points. It is difficult to obtain products with higher purity by distillation, so the usual method is According to the difference of crystallization point, it is prepared by crystallization method. [0003] At present, there are many static crystallization technologies in China. The static crystallizer technology is mainly: the cooling medium is used in the tube side, and the material is used in the shell side. Most of the inner tube walls of the shell side are equipped with fins to incr...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the existing dynamic crystallization device, and to provide a gradient cooling falling film dynamic crystallizer and a falling film crystallization separation method for the mixture

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