Acid tar recovery and treatment method

Abstract

The invention discloses an acid tar recovery and treatment method. The method comprises the steps of adding acid tar and ammonia water which are at the weight ratio of (1 to 6) to (1 to 2) into a reactor to obtain a mixed solution; enabling the acid tar and the ammonia water to be subjected to neutral reaction under the condition of 85-90 DEG C; when the pH value of the mixed solution is up to 7-8, introducing the mixed solution to a vertical tar and ammonia water separation device containing a mixture of the tar, the ammonia water and tar residues, mixing the mixture of the tar, the ammonia water and the tar residues with the mixed solution, and separating a mixture composed of the mixture of the tar, the ammonia water and the tar residues as well as the mixed solution. The mixture composed of the mixture of the tar, the ammonia water and the tar residues as well as the mixed solution is separated by the vertical tar and ammonia water separation device, so that the mixture containing the tar and benzene insoluble substances in the mixed solution is located at a lower layer, and a mixture containing the ammonia water and ammonium sulfate in the mixed solution is located at an upper layer.

Description

technical field [0001] The invention relates to a recovery and treatment method of acid tar, in particular to a recovery and treatment method of acid tar which avoids secondary pollution to the environment. Background technique [0002] During the production of ammonium sulfate (ammonium sulfate) from coke oven gas, due to the reaction of the tar mist entrained in the gas with about 3% to 5% of the free acid contained in the mother liquor of ammonium sulfate, a complex polymerization mixture will be produced. Namely sour tar. Relevant detection data shows, acid tar can comprise the sulfuric acid of 2.22%~3.82%, the ammonium sulfate of 18%~22% (such as 20%), the ash content of 0.71%~0.84%, 50%~52% (such as 51%) of benzene insolubles and 28% to 36.5% of water. The acid tar formed by contacting the tar entrained in the gas with the sprayed sulfuric acid solution is bonded with the entrained coal powder and the ammonium sulfate crystal grains in the ammonium sulfate mother liq...

AI Technical Summary

Problems solved by technology

Although the incineration treatment can completely destroy the harmful components in the acid tar, the direct incineration of the acid tar will cause the sulfuric acid in the acid tar to decompose at high temperature, and produce a large amount of SO2, which will cause environmental pollution if it is directly discharged.

In addition, since the acid tar is directly incinerated, the benzene insoluble matter in the acid tar cannot be recycled, resulting in a waste of resources

Images