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US 4,899,813 AGranted
Process and apparatus for the synthesis of urea and material used in it
AssigneeSnamprogetti S.p.A.
InventorsSergio Menicatti, Cesare Miola, Franco Granelli
Life of this patent
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Abstract
Process and apparatus for the production of urea, wherein the carbamate decomposers and/or condensers are equipped with stainless steel tubes internally lined with zirconium.
Claims4
An apparatus for use in an ammonium carbamate decomposer and/or a condenser in the synthesis of urea, comprising a nest of stainless steel tubes internally lined with a foil made of unalloyed zirconium which is not welded to said stainless steel tubes, wherein the thickness of said zirconium foil is less than about 0.8 mm.
Dependencies are inferred from the claim text.