| 摘要 |
1385926 Concentrating sulphuric acid NEW JERSEY ZINC CO 23 Nov 1972 [6 Dec 1971] 54294/72 Heading BIB Dilute aqueous solutions containing sulphuric acid and metal sulphates are evaporated and condensed under condition that the acid is not decomposed and less than all the water evaporated is condensed. The acid is not decomposed if the final temperature does not exceed 350‹-400‹C and is achieved in a very short time. The concentration of water in the final product will depend upon the degree of cooling. This effect can be enhanced by evaporating and condensing in stages. |
