Patent ID: 9499405
Filing Date: 2016-11-22
CPC Classification: C01B

Claim Text:
1. A process for producing sulfuric acid with reduced levels of niter, comprising: a) providing an absorption tower wherein sulfur trioxide is absorbed in a sulfuric acid feed having a first sulfuric acid solution to produce a sulfuric acid effluent having i) a second sulfuric acid solution which has a higher concentration than the first sulfuric acid solution, ii) a niter concentration greater than about 5 ppm (as NO b) contacting a first purifying agent comprising sulfamic acid and a second purifying agent comprising hydrogen peroxide with the sulfuric acid effluent to form a treated sulfuric acid effluent, the treated sulfuric acid effluent being maintained at a temperature of greater than 100° C. for a maintenance period of at least about 1 minute; wherein the first purifying agent and the second purifying agent are added to the sub-surface of the sulfuric acid effluent.