| 摘要 |
A process for the removal and recovery of ammonia from liquid waste, characterized essentially by the following operations: reacting the liquid waste with pure carbon dioxide, or with a gaseous mixture rich in carbon dioxide, or with at least one carbonate, to give ammonium carbonate reacting the resulting ammonium carbonate with calcium chloride to give calcium carbonate and ammonium chloride; causing the resulting calcium carbonate to undergo thermal decomposition to give calcium oxide and carbon dioxide; using, optionally, the carbon dioxide formed after thermal decomposition of calcium carbonate for said reaction with the liquid waste; and using the calcium oxide, formed after thermal decomposition of calcium carbonate, for the production of pure ammonia, by reaction with the ammonium chloride obtained in said reaction between ammonium carbonate and calcium chloride. The figure shows a flow sheet of a plant allowing the operations of an embodiment of the above process.
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