US 2026/0184674 A1Published application

Process to produce a melt of urea and biuret and system to produce such a melt

AssigneeYara International Asa

InventorsRuud VAN BELZEN, Anand MOHAN, Robert LAM, Tom VAN DE WALLE, Laura PIRRO, Pieter DE VRIES

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Abstract

A process and a system for producing a melt including urea, biuret, and a minor amount of N-containing compounds, the process including pumping a urea melt to one or more reactor vessels each having a headspace at a top part thereof and a bottom part, subjecting the urea melt in the one or more reactor vessels to a heating process with a temperature of between 150° C. to 180° C., during the heating process also subjecting the melt present in the reactor vessel(s) to a circulation process in and out of the one or more reactor vessels via a circulation loop arranged externally from each of the reactor vessels, wherein during formation of the melt, gaseous by-products are produced which are evacuated out of the respective reactor vessel via the top part thereof, and removing the melt out of the one or more reactor vessels via the bottom part thereof.

Claims25

Dependent claims

A process for producing a melt comprising urea, biuret, and N-containing compounds produced during a condensation process of urea, the process comprising the steps of:

pumping a urea melt to one or more reactor vessels each having a headspace at a top part thereof and a bottom part,
subjecting the urea melt in the one or more reactor vessels to a heating process with a temperature of between 150° C. to 180° C., wherein during the heating process the urea melt is converted to the melt comprising urea, biuret, and N-containing compounds;
wherein during formation of the melt comprising urea, biuret, and N-containing compounds, gaseous by-products are produced which are evacuated out of the respective reactor vessel via the top part thereof;
and
removing the melt comprising urea, biuret, and N-containing compounds out of the one or more reactor vessels via the bottom part thereof;
characterized in that, during the heating process, the melt present in the reactor vessel(s) is circulated in and out of the one or more reactor vessels via a circulation loop, wherein the circulation loop is arranged externally from each of the reactor vessels and equipped with a circulation pumping means.

3 more elements

A system for producing a melt comprising urea, biuret and N-containing compounds created during a urea condensation process, the system comprising

a pumping device to pump a urea melt to one or more reactor vessels each having a headspace located at a top part thereof, and a bottom part, wherein the one or more reactor vessels are configured to produce the melt comprising urea, biuret, and N-containing compounds therein, and wherein each of the reactor vessels comprise a heating device configured to heat the urea melt to a temperature of between 150° C. and 180° C., wherein during the heating process the urea melt is converted in the melt comprising urea, biuret, and N-containing compounds;
and
a valve arranged to evacuate gaseous by-products produced during the urea condensation process out of the respective reactor vessel(s) via the top part thereof;
and
a valve arranged to remove the melt out of the one or more reactor vessels at the bottom part thereof,
characterized in that each of the reactor vessels comprise a circulation loop arranged externally to each of the one or more reactor vessels and comprising a circulation pumping means to circulate the melt present in the one or more reactor vessel(s) in and out of the respective circulation loop.

3 more elements

Dependencies are inferred from the claim text.