WASTE GAS DISPOSAL AND METHOD FOR PREPARATION OF DISPOSAL BY-PRODUCT

摘要

PURPOSE: Are provided a waste gas disposal and the method for the preparation of disposal by-product, which divides toxic substance such as SOx or NOx contained in waste gas as each ingredient by using neutralization and oxidation reaction and can use the by-product as chemicals. CONSTITUTION: The waste gas disposal and the method for preparation of disposal by-product comprises; the first process of collecting the whole quantity of SOx and the portion quantity of NOx as neutralization by surface contact to apply waste gas to the first absorption column(10) sprayed sodium hydroxide solution, and obtaining liqueified SO2 through compressing and cooling after dividing the solution, if SOx is changed into acidic sodium sulfite, heating and drying to discharge as sulfur dioxide; the second process of making nitrogen dioxide by oxidation reaction the gas mixture removed SO2 at the catalytic reactor(40) and obtaining nitric acid by dissolving in water at the second column(70); and the third process of recovery of and crystallizing Na2CO3 solution by neutralization reaction at the third absorption column(80) spraying the other mixture exhausted from the second absorption column(70) on the sodium hydroxide solution and discharging remained gas to atmosphere.