| 摘要 |
1294749 Conc. HNO 3 SUMITOMO CHEMICAL CO Ltd 27 April 1970 [30 April 1969 3 July 1969] 20158/70 Heading C1A In a process for the production of HNO 3 in which dilute nitric acid 1 and air 11 are fed in countercurrent flow to a reactor 6 where they react together with liquid NO 2 7, the acid leaving the reactor via 9 is scrubbed, preferably in countercurrent flow, with feed air in 10 and the off gases 4 are scrubbed, preferably in countercurrent flow, with feed dilute nitric acid in 2, thereby transferring unreacted NO 2 from off gases and product nitric acid back to the reactor together with said feed air and feed nitric acid. |
