Butadiene rectification system and its rectification method in butadiene rubber synthesis process

Abstract

The invention relates to a method for rectifying butadiene in a butadiene rubber synthesis process, comprising: washing the crude butadiene with desalted water, extracting a first intermediate product, and washing the first intermediate product with a sub-salt solution , extract the second intermediate product, use alkaline solution to wash the second intermediate product, extract the third intermediate product, and then extract the fourth intermediate product after standing and layering, and mix the fourth intermediate product with an organic solvent Then carry out rectification treatment to extract the fifth intermediate product, and then extract the mixture of butadiene and organic solvent after condensation and standing layering. The mixture is mixed with the polymerization inhibitor and then refluxed to obtain the Butter oil. The invention also relates to a butadiene rectification system in the butadiene rubber synthesis process. By adopting the rectification method and rectification system of the present invention, the recovered amount of butadiene can be increased, the safety risk of equipment operation can be reduced, the maintenance cycle and operation time of the equipment can be prolonged, and energy consumption can also be reduced.

Description

Butadiene rectification system and rectification method in butadiene synthesis process technical field The present invention relates to cis-butadiene rubber production technical field, particularly relate to butadiene in the cis-butadiene rubber synthesis technique. Distillation system and its rectification method. Background technique The recovery unit of butadiene rubber production unit comprises butadiene dehydration tower, butadiene recovery tower and solvent weight removal tower, Separate the unreacted butadiene and solvent oil in the production of cis-butadiene rubber, and the solvent oil is recycled after refining, and the unreacted butadiene After the diene is recovered, it is sent to the rectification system for processing, and its main process is: (1), the butadiene crude product that is recovered is first in the butadiene In the water washing tower, polar substances such as DMF, dimethylamine, CAN and trace oxygen are treated with sodium nitrite or sodium ...

AI Technical Summary

Problems solved by technology

[0003] However, in this process, due to the influence of temperature, oxygen content and other factors, in the gaseous state, butadiene is prone to produce butadiene self-polymer in the water washing tower, dehydration tower and weight removal tower, mainly Including butadiene peroxide, butadiene dimer, terminal polymer, and butadiene colloidal polymer, these butadiene self-polymers will seriously affect the recovery of butadiene, and will also clog the meter In equipment such as ports and tube bundles, there are great potential safety hazards

Images