Production device for preparing benzenesulfonyl chloride and diphenyl sulfone by distilling benzenesulfonyl chloride crude product

Abstract

The invention relates to a production device for preparing benzenesulfonyl chloride and diphenyl sulfone by distilling a benzenesulfonyl chloride crude product. The production device comprises a distillation kettle, a rectifying column group, a condenser group, a material receiving system and a vacuumizing system which are sequentially connected through a pipeline; the rectifying column group comprises a large rectifying column and a small rectifying column, and the top end of the small rectifying column is communicated with a head and tail material storage tank; the condenser group comprisesa first pre-cooling pipe, a second pre-cooling pipe and a condenser which are sequentially communicated with one another; the material receiving system comprises a benzenesulfonyl chloride receiving tank and a diphenyl sulfone receiving tank; the benzenesulfonyl chloride receiving tank is communicated with a discharge port through a first discharge pipe, and the diphenyl sulfone receiving tank isconnected to the first discharge pipe through a second discharge pipe; according to the invention, a first condenser pipe and a second condenser pipe with smaller volumes are preset in front of the condenser, so that benzenesulfonyl chloride immediately enters the first pre-cooling pipe and the second pre-cooling pipe after being separated by the large rectifying column, and benzenesulfonyl chloride gas with high temperature is precooled, thereby reducing the thermal decomposition of benzenesulfonyl chloride, realizing efficient fractionation and improving the purity of fractions.

Description

technical field [0001] The invention relates to the technical field of benzenesulfonyl chloride production, and more specifically relates to a production device for preparing benzenesulfonyl chloride and diphenyl sulfone by distillation of crude benzenesulfonyl chloride. Background technique [0002] Benzenesulfonyl chloride is a kind of dye and pharmaceutical intermediate. Distillation is the key process to produce high-quality benzenesulfonyl chloride. However, the following problems often occur in distillation operation. First of all, the distillation temperature mainly depends on the absolute pressure in the still. When the absolute pressure is too high, if you want to absolutely separate the substances, the heating temperature will often be too high. At high temperatures, benzenesulfonyl chloride is prone to local decomposition. And some high-boiling-point impurities are vaporized, making the produced benzenesulfonyl chloride impure, and even causing the product to turn...

AI Technical Summary

Problems solved by technology

First of all, the distillation temperature mainly depends on the absolute pressure in the still. When the absolute pressure is too high, if you want to absolutely separate the substances, the heating temperature will often be too high. At high temperatures, benzenesulfonyl chloride is prone to local decomposition. And make some impurities with high boiling point vaporized, so that the produced benzenesulfonyl chloride is impure, and even cause the color of the product to turn yellow, failing to achieve the expected distillation effect

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