| 摘要 |
1529264 Purifying and concentrating phosphoric acid PROREA SA 19 Feb 1976 [25 Feb 1975] 06674/76 Heading BIB [Also in Division Cl] Impure H 3 PO 4 is purified of fluorine and concentrated by mixing with water and product acid, contacted with a countercurrent flow of hot gas to remove fluorine-containing impurities overhead, and using part of the product acid to provide further initial mixture. Thus impure acid (F2) and water (F3) are mixed in 2 with some of the product acid (via 7), the mixture is sprayed via 4 and contacted with hot gases from burner 8; product acid collects at 6 and the part not passed to 2 is removed (F4). |
