Improvements in the regeneration of carbonated ammoniacal solutions

摘要

306,947. Soc. L'Air Liquide, Soc. Anon. pour I'Etude et l'Exploitation des ProcÚdÚs G. Claude, (Assignees of Soc. Chimique de la Grande Paroisse Azote et Produits Chimiques). Feb. 29, 1928, [Convention date]. Purifier waste, revivifying. - In regenerating carbonated ammoniacal solutions by first heating crude liquor by means of regenerated solution to a temperature below that required to free carbon dioxide, and then to a higher temperature, the regenerated solution is heated immediately after regeneration and is brought in counter-current into indirect contact with the crude solution. The carbonated solution heated to about 65‹ C. by the regenerated solution in a heat exchanger D enters at G a rectification column A. Imperforate steam pipes I heat the regenerated solution, which is raised by a pump C through double-bottomed plates B in the column to heat indirectly the descending solution and then passes by pipes K, L to be cooled in the heat exchanger. Vapours, including carbon dioxide and hydrogen sulphide, rising above the inlet G are washed by cold untreated liquor added at N and further cooled by water circulated through pipes 0, P. Carbon dioxide liberated at R may be used to combine with any free ammonia in an untreated solution.