Stamicarbon B.v.

Willem Frederik Roos

Fredericus Henricus Maria Buitink

Johannes Henricus Mennen

Jozef Hubert Meessen

Johannes Lambertus Kursten

The invention provides a method and a plant for producing urea ammonium nitrate (UAN). The method involves the use of a condensation section, optionally in combination with a medium pressure decomposition section, between the dissociation and neutralization sections. The invention further provides a method of modifying an existing UAN plant. The advantages of the process of the invention are that the emission of COcan be reduced, the plant capacity can be increased and the high capital expenditure needed for COcompression equipment is reduced.

Method and plant for producing urea-ammonium nitrate (UAN)

The present invention relates to a process for the preparation of granules comprising the steps of: providing a granulation zone comprising particles, the particles being kept in motion; providing a first feed stream comprising a liquid composition into the granulation zone, the liquid composition being applied onto or over the moving particles in the granulation zone; withdrawing a product stream comprising granules from the granulation zone, the granules being the result of layered growth of the moving particles in the granulation zone; wherein a second feed stream comprising granulation nuclei is fed into the granulation zone, wherein the granulation nuclei have a particle size distribution characterized by a standard deviation of the particle size that is less than 15% of the mean particle size, and wherein the second feed stream comprises between 0.05 wt % and 50 wt % of the product stream.

Process for producing granules

The present invention relates to a process for the production of granules from a liquid composition with a decreased dust production, the process steps are as follows: applying the liquid composition onto solid particles that are kept in a continuous movement by a gas stream in a granulation zone of an oblong granulator, thereby depositing and solidifying liquid composition around the solid particles to increase the size of the particles and thereby form grown solid particles; discharging a stream of the grown solid particles from the granulation zone, dividing, in a size-sorting apparatus, the stream of grown solid particles into individual streams based on the size of the grown solid particles to thereby produce streams of undersized, oversized, and desired-sized grown solid particles; transferring the stream of oversized grown solid particles to a size-reducing apparatus; crushing the stream of oversized grown solid particles in the size-reducing apparatus, thereby reducing the particle size of the oversized grown solid particles and thereby producing a stream of crushed solid particles wherein that stream of crushed solid particles is introduced in the granulator at a place below the place where the gas stream leaves the granulator.

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Hoensbroek, Netherlands

Willem Frederik Roos