Abstract: A two step process for concentrating and desalting dilute sulfuric acid including, first indirectly countercurrently contacting and heating the dilute acid with steam from a second step, removing overhead water vapor and withdrawing concentrated acid, and second further concentrating the acid by directly countercurrently contacting and heating the acid with superheated steam, removing overhead steam and additional water vapor, which is used in the first heating step. Acid of a higher concentration is withdrawn and cooled to crystallize and remove salts and the more highly concentrated sulphuric acid recovered.
Type:
Grant
Filed:
October 17, 1974
Date of Patent:
November 16, 1976
Assignee:
Hoechst Aktiengesellschaft
Inventors:
Kurt Bodenbenner, Gerhard Muller, Heinrich Muller