Phosphorus trichloride tail gas treatment process

Abstract

The invention discloses a phosphorus trichloride tail gas treatment process. Phosphorus trichloride tail gas is introduced into two sets of process routes to be treated. According to the first process route, the phosphorus trichloride tail gas is introduced into a water absorption tower, and unabsorbed tail gas is introduced into an alkali absorption tower; according to the second process route, the phosphorus trichloride tail gas is introduced into a reaction kettle, a mixture of absolute ethyl alcohol, ortho-dichlorobenzene and N,N-dimethylaniline is added into the reaction kettle, and unabsorbed tail gas is introduced into the alkali absorption tower. According to the phosphorus trichloride tail gas treatment process, a traditional process is optimized, the phosphorus trichloride tail gas is treated, byproducts of phosphorous acid and triethyl phosphite are obtained, the utilization rate of phosphorus trichloride of the phosphorus trichloride tail gas is increased, and the probability of discharging the phosphorus trichloride into the atmosphere is extremely decreased. By means of the phosphorus trichloride tail gas treatment process, the production benefit is guaranteed, and the natural environment is protected.

Description

technical field [0001] The invention relates to the field of chemicals, in particular to a phosphorus trichloride tail gas treatment process. Background technique [0002] Phosphorus trichloride, the molecular formula is PCl3, the relative molecular weight is 137.33, the density is 1.574, the melting point is -112°C, the boiling point is 76°C, and the appearance is colorless and clear liquid. There will be 1,800 tons in the 100,000-ton phosphorus trichloride production device per year Phosphorus trichloride is discharged along with the tail gas, which not only causes waste in production, but also destroys the natural environment. Contents of the invention [0003] The purpose of the present invention is to provide a process for treating phosphorus trichloride tail gas. [0004] The present invention is realized through the following technical solutions: [0005] A phosphorus trichloride tail gas treatment process, the phosphorus trichloride tail gas is simultaneously pas...

AI Technical Summary

Problems solved by technology

[0002] Phosphorus trichloride, the molecular formula is PCl3, the relative molecular weight is 137.33, the density is 1.574, the melting point is -112°C, the boiling point is 76°C, and the appearance is colorless and clear liquid. There will be 1,800 tons in the 100,000-ton phosphorus trichloride production device per year Phosphorus trichloride is discharged along with the tail gas, which not only causes waste in production, but also destroys the natural environment