Casale Sa

Alberto Benedetti

Leonardo Marrone

Paolo Bertini

Pierdomenico Biasi

Cristina Pizzolitto

A process for purifying a urea-containing aqueous stream, such as the aqueous stream from the recovery section of a urea plant, comprising a step of removing biuret from the urea-containing stream by reverse osmosis in one or more reverse osmosis stages.

Process for producing low-biuret urea

A process for the production of urea wherein: production of pure urea (U) includes the concentration of an aqueous urea solution () by crystallization; a urea crystallization purge aqueous phase () comprising urea, water and biuret, which is purged from the urea crystallization process, is used in a high-biuret urea processing section () for additional production of urea with a high content of biuret.

Process for producing urea and biuret

A process for the production of biuret from urea wherein: a urea aqueous solution () withdrawn from the recovery section of a urea plant is processed to remove water and obtain a concentrated urea melt (); said urea melt is processed under biuret-forming conditions to decompose urea into biuret and ammonia and obtain a high-biuret urea melt (); said high-biuret urea melt () is diluted with water or with an aqueous stream obtaining a solution (); the solution () is subject to crystallization and precipitation of a solid phase containing biuret which is separated from the aqueous phase.

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Como, Italy

Alberto Benedetti