Ammonia → Sulfuric acid diammonium salt, compd. with urea

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WO 01/51429 relates to a method for producing a fertilizer containing ammonium sulphate and urea. An aqueous urea solution is provided which, with regard to the total weight of the solution, contains 0.1 to 50 wt. % of free ammonia and/or of ammonia that is bound in the form of ammonium carbamate. Said aqueous urea solution is reacted with sulphuric acid and, optionally, with ammonia at a temperature ranging from 25 to 250° C. and at a pressure ranging from 0.1 to 250 bar. A urea-ammonium sulphate solution or suspension is formed in quantities that result in a weight ratio of ammonium sulphate to urea in this urea-ammonium sulphate solution or suspension that ranges from 10:90 up to 65:35. Carbon dioxide and ammonia expelled under these conditions are returned to the urea synthesis. Afterwards, this urea-ammonium sulphate solution or suspension is subjected to a subsequent processing in order to produce solid or liquid fertilizers.

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