Trichloroethylene rectifying tower

Abstract

The invention discloses a trichloroethylene rectifying tower. The rectifying tower comprises a rectifying tower body and a plurality of manholes formed in the rectifying tower body, a spraying passivation device for preventing the inner wall of the rectifying tower body from reacting with oxygen in trichloroethylene is arranged in the rectifying tower body, the spraying passivation device comprises a supporting plate which is arranged between the two fillers and is positioned at the bottom end of the top filler, according to the trichloroethylene rectifying tower, the spraying passivation device is arranged on the inner wall of a rectifying tower body, namely the outer side of a filler layer, according to the spraying passivation device, before a trichloroethylene reaction is carried out in the rectifying tower body, spraying passivation coating can be carried out on the inner wall of the steel rectifying tower, or after the rectifying tower body is used for a certain number of times,the inner wall of the rectifying tower body can be sprayed, so that the inner wall of the steel rectifying tower body is in a passivated state, meanwhile, the inner wall is kept smooth, oxygen is prevented from reacting with the inner wall of the rectifying tower, the preparation efficiency of trichloroethylene is improved, and impurities such as black spots are prevented from being contained during trichloroethylene preparation.

Description

technical field [0001] The invention relates to the technical field of rectification towers, in particular to a trichlorethylene rectification tower. Background technique [0002] The rectification tower is a tower-type gas-liquid contact device for rectification. Utilizing the different volatility of each component in the mixture, that is, the property that the vapor pressure of each component is different at the same temperature, the light components (low boilers) in the liquid phase are transferred to the gas phase, and the light components in the gas phase are transferred to the gas phase. The heavy components (high boilers) are transferred to the liquid phase, thus achieving the purpose of separation. Distillation tower is also a mass transfer and heat transfer device widely used in petrochemical production; [0003] At present, the internal temperature control range of the rectification tower used in the existing trichlorethylene production is 32~34°C, so the rectifi...

AI Technical Summary

Problems solved by technology

[0003] At present, the internal temperature control range of the rectification tower used in the existing trichlorethylene production is 32~34°C, so the rectification low-boiling tower is used for rectification. However, during the rectification process, along the interior of the rectification tower The crude trichlorethylene fed often contains hydrogen chloride and a small amount of oxygen. Since the rectification tower is made of steel, a small amount of oxygen is likely to cause corrosion of the inner wall of the tower and produce iron ions. The existence of monomeric iron ions, It will lead to impurities such as black spots in the production process of trichlorethylene, which will further affect the uniformity and precision of hydrogen trichloride preparation

Images