The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 22, 2016
Filed:
Mar. 10, 2015
E I Du Pont DE Nemours and Company, Wilmington, DE (US);
Hasan Dindi, Wilmington, DE (US);
EI DU PONT DE NEMOURS AND COMPANY, Wilmington, DE (US);
Abstract
This disclosure relates to a process for producing sulfuric acid with reduced levels of niter. The process involves (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), and (iii) a temperature greater than 100° C.; and (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.