Patent · US Expired

Method and apparatus for making sulphuric acid

US4591494A · kind A · utility

3Cited by

4References

7Claims

0Family size

Assignee

C-I-L, Inc. · CA

Inventors

Gordon M. Cameron · Vaughan, CA
Edward G. C. Lyne · Scarborough, CA

Key dates

Filing date	Apr 23, 1985
Grant date	May 27, 1986
Priority date	—
Expiry date	Apr 23, 2005

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01B17/7655
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

In a system using the double absorption process for sulphuric acid manufacture, a single acid circulation system and a single cooler are employed. Acid from the exit of the air drying tower is circulated to and flows through the final absorber where it absorbs the inlet SO.sub.3 gas before joining with the acid from the intermediate absorber. The mixed stream is then cooled and split between the drying tower and the intermediate absorber. The circulation arrangement reduces the cooling to one relatively high temperature location, eliminates the transfer of SO.sub.2 to the effluent gas from acid in the normal single system, and simplifies acid strength and level control.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.