Rectification system and method of aluminium ethyl crude product

Abstract

The invention provides a rectification system and method of an aluminium ethyl crude product. The rectification method comprises the following steps: firstly, adding a certain quantity of white oil in a mixing and rectifying kettle by adopting a rectifying system, and heating the white oil to 120 DEG C-140 DEG C by adopting a rectifying system; then, adding an aluminium ethyl crude product generated by reaction continuously; vaporizing the aluminium ethyl crude product added under a vacuum state, and adding the gaseous aluminium ethyl continuously into a rectifying tower; feeding in a condenser after rectification, wherein a part of cooled aluminium ethyl is taken as reflux and returns to the rectification tower by a backflow system, and the rest of cooled aluminium ethyl is fed into an aluminium ethyl storage tank by a valve I; bringing trace white oil in the rectification tower, and guiding a material at the bottom of the rectification tower back to a mixing and distilling still for distilling when the concentration of white oil at the bottom of the distilling still reaches 30-50%. According to the invention, aluminium ethyl and fixed impurities in the aluminium ethyl crude product can be separated once simply before rectification; the pollution to the environment is reduced and the product yield is also improved by 2-3%.

Description

technical field [0001] The invention mainly relates to a system and method for filtering and then rectifying crude triethylaluminum. Background technique [0002] During the production of triethylaluminum, due to reasons such as the oxidation of aluminum powder and the incomplete reaction of aluminum powder, the produced triethylaluminum reaction solution contains impurities such as aluminum powder and alumina. In order to separate triethylaluminum from impurities, the current production process adopts rectification separation, which effectively separates triethylaluminum from solids and achieves the effect of storage. But at the same time of separation, part of triethylaluminum and by-product tri-n-butylaluminum are also left in impurities. These impurities are cumbersome to deal with. The hydrolysis process was first used in the Liaohua triethyl aluminum plant to decompose the resulting impurity mixture into safe gases, but this process is relatively dangerous. Afterward...

AI Technical Summary

Problems solved by technology

Afterwards, the triethylaluminum plants in Tianjin and Jiaxing began to use incineration to treat the residual liquid in the tower kettle. This process has been proved by practice to be more polluting.

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