Rectification system and solvent purification system

Abstract

The invention discloses a rectification system and a solvent purification system, and relates to the technical field of chemical product purification. The rectification system comprises a rectification kettle, a rectification tower, a condenser, and a reflux tank which are connected in sequence, wherein a first temperature sensor is arranged at the top of the rectification tower, and a second temperature sensor is arranged at the bottom of the reflux tank. The second temperature sensor can precisely measure temperature of condensed liquid in the reflux tank; the first temperature sensor can precisely measure temperature of the top of the rectification tower; the amount of the condensed liquid refluxing to the tower top is determined according to the temperature condition of the condensed liquid and the temperature condition of the top of the rectification tower, so that the temperature of the tower top can be kept at a relatively constant range to guarantee a rectification effect. Equipment of the rectification system is simple and convenient to operate; a reflux ratio is precisely controlled by the temperature serving as a control index, thus meeting a rectification requirement of fine chemical engineering. The solvent purification system comprises the rectification system. Equipment of the solvent purification system is simple and convenient to operate, and the reflux ratio can be precisely controlled to achieve a better purification effect.

Description

technical field [0001] The invention relates to the technical field of chemical product purification, in particular to a rectification system and a solvent purification system. Background technique [0002] Rectification is a distillation method that uses reflux to separate liquid mixtures with high purity. It is the most widely used liquid mixture separation operation in industry, and is widely used in petroleum, chemical, light industry, food, metallurgy and other departments. In the rectification operation, the ratio of the reflux liquid flow L returned to the column from the top of the rectification tower to the top product flow D is the reflux ratio. The size of the reflux ratio has an important impact on the separation effect and economy of the rectification process. Therefore, in the distillation design, the reflux ratio is a parameter that needs to be carefully selected. [0003] However, in the prior art, in order to have a more precise control on the reflux ratio...

AI Technical Summary

Problems solved by technology

[0003] However, in the prior art, in order to have a more precise control of the reflux ratio, a complex control system is required, resulting in high production costs

Limited by the cost problem, the reflux ratio can only be controlled within a rough range in many cases, which is far from meeting the requirements for fine chemicals

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