| 摘要 |
A continuous procedure is disclosed for the wet-process manufacture of phosphoric acid in a reaction zone and continuously cooled by means of evaporation into air circulating at the surface of the reaction zone. The evaporated gases are scrubbed by using part of the water needed for the methodic washing of the calcium sulfate, whereby the solution obtained is collected and passed into the reaction zone in such a way as to cause the soluble gaseous products to return to the reaction medium, from which they are collected with strong acid, which constitutes production. The procedure gives rise to no liquid pollutants, particularly fluorine, and does not increase the amount of water consumed. |
