Outer-tower downcomer chlorination tower and running process thereof

Abstract

The invention provides an outer-tower downcomer chlorination tower and a running process thereof. Multiple tower sections are assembled into a whole body up and down; each tower section is provided with an empty cylinder, a tower tray is connected with the lower end of the empty cylinder, a riser and a vent cap are arranged in the empty cylinder, the vent cap covers the riser, surplus gas of a lower tower section penetrates through the riser and then enters the tower section, and multiple micro air holes are formed in the wall surface of the lower end of the vent cap; a liquid inlet is formed in the wall surface of one side of the empty cylinder, and liquid of an upper tower section penetrates through the liquid inlet and then enters the tower section; a liquid outlet is formed in the wall surface of the other side of the empty cylinder and is communicated with a connecting pipe, which is arranged vertically upwards, the connecting pipe is communicated with a downcomer, and the downcomer is communicated with a liquid inlet of the lower tower section; a balance air inlet is formed in the middle upper part of one side of the empty cylinder and is communicated with the upper end of the connecting pipe. The chlorination tower has the advantages that the structure is simple, the maintenance rate is low, the temperature and the pressure drop of a reaction system can be accurately controlled, and the purity of reaction products is high.

Description

technical field [0001] The invention relates to production equipment and a production process of trichloroacetaldehyde. Background technique [0002] Trichloroacetaldehyde (or chloral) is one of the important halogen derivatives of hydroxyl compounds. It is a colorless and volatile oily liquid with a pungent odor. The boiling point is 97.8°C, the melting point is -57.5°C, and the relative density is 1.5121. It can be dissolved in water, ethanol, ether and chloroform, and hydrated to form chloral hydrate (or chlorine oil). Chloral can be widely used in the production of pesticides, medicines and organic synthesis industries. Its production methods include ethanol chlorination and acetaldehyde chlorination. Now the industry mainly adopts ethanol tower chlorination. The raw material reacts with chlorine and water at 80-90°C to form chlorine oil, which is then reacted with concentrated sulfuric acid and obtained by distillation. [0003] The reaction mechanism of the ethanol ...

AI Technical Summary

Problems solved by technology

[0008] To overcome the problems of high failure rate and low yield of traditional ethanol chlorination equipment, and provide an external downflow chlorination tower with simple equipment structure, easy maintenance, flexible control, and reduced production costs and its operating process

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