Disclosed is a method for the integrated production of two different urea products. One is an aqueous urea solution suitable for use in NOx abatement (generally indicated as Diesel Exhaust Fluid DEF). The other is a solution used as a fertilizer, viz. Urea Ammonium Nitrate (UAN). The production of DEF and UAN are integrated as follows: ammonia recovered from the production of urea is used as a feed to the production of ammonium nitrate. At least part of an aqueous urea stream from urea production, is mixed with ammonium nitrate so as to obtain UAN.

The present application relates to a closed container containing ammonium nitrate (AN) particles in an amount of 91 to 99.75 weight % and desiccant in an amount of 0.25 and 9 weight %, wherein the AN particles have a water content of between 0 and 0.7 weight %, and the desiccant particles comprise between 50 and 95 weight % of AN and between 5 and 50 weight % of magnesium nitrate dispersed in the AN. The application furthermore relates to a method for producing of ammonium nitrate particles that are stored in a closed container and having improved anti-caking properties.

Disclosed is a method for the integrated production of two different urea products. One is an aqueous urea solution suitable for use in NOx abatement (generally indicated as Diesel Exhaust Fluid—DEF). The other is a solution used as a fertilizer, viz. Urea Ammonium Nitrate (UAN). The production of DEF and UAN are integrated as follows: ammonia recovered from the production of urea is used as a feed to the production of ammonium nitrate. At least part of an aqueous urea stream from urea prodution, is mixed with ammonium nitrate so as to obtain UAN.

A method for preparing urea ammonium nitrate solution from waste nitric acid after stripping tin from circuit board includes: causing the waste nitric acid after stripping tin and the ammonia water to undergo neutralizing and precipitating reaction through acid-base neutralization, filtering, thereby obtaining tin-containing filter mud and a primary filtrate; adding iron powders into to the primary filtrate to initiate copper-iron replacement reaction, filtering, thereby obtaining iron-containing coarse copper powders and a secondary filtrate; adding hydrogen peroxide to the secondary filtrate, filtering, thereby obtaining an iron-containing sludge and a tertiary filtrate; adding a heavy metal capturing agent to the tertiary filtrate, filtering, thereby obtaining a heavy metal sludge and an ammonium nitrate solution; measuring a concentration of the ammonium nitrate solution, adding urea and liquid fertilizer corrosion inhibitor to obtain a urea/ammonium nitrate dilute solution, evaporating and concentrating the urea/ammonium nitrate dilute solution, thereby obtaining the urea ammonium nitrate solution.

A method for preparing a cathode active material precursor for a secondary battery, including: moving a co-precipitation filtrate generated after a co-precipitation reaction to a co-precipitation filtrate storage tank; removing a metal hydroxide by passing the co-precipitation filtrate through a filter; reacting the co-precipitation filtrate from which the metal hydroxide is removed with sulfuric acid or nitric acid to produce an ammonium sulfate or an ammonium nitrate while removing ammonia from the co-precipitation filtrate from which the metal hydroxide is removed; cooling and crystallizing the co-precipitation filtrate from which the metal hydroxide and ammonia are removed to precipitate a sodium sulfate; filtering the precipitated sodium sulfate to separate the precipitated sodium sulfate from the co-precipitation filtrate from which the metal hydroxide and ammonia are removed; drying the sodium sulfate separated from the co-precipitation filtrate and moving the co-precipitation filtrate separated from the sodium sulfate to a circulation concentration tank; and heating the co-precipitation filtrate stored in the circulation concentration tank to a predetermined temperature for recycling and performing N.sub.2 purging or bubbling, is provided.

The invention relates to a process for the production of urea ammonium nitrate, a system and a method of modifying a plant. The process comprises subjecting ammonia-containing off-gas resulting from the production of ammonium nitrate (AN off-gas) to condensation under acidic conditions so as to form an acidic condensate, and using at least part of the acidic condensate as an acidic scrubbing liquid in a finishing treatment section having a gas inlet in fluid communication with a gas outlet of a finishing section of a urea production unit, wherein the finishing section is adapted to solidify urea liquid, and wherein said finishing treatment section is adapted to subject ammonia-containing off-gas of the finishing section to treatment with an acidic scrubbing liquid.

A production system for a product selected from a nitrogen-containing product and a fermented and cultured product that does not involve (or can minimize) the transport of liquid ammonia can include: an ammonia synthesis apparatus in which an ammonia-containing gas is synthesized by reaction of a source gas containing hydrogen and nitrogen in the presence of a supported metal catalyst containing as a support one or more selected from the group consisting of: i) a conductive mayenite compound; ii) a two-dimensional electride compound or a precursor thereof; and iii) a complex formed of a support base containing at least one metal oxide selected from ZrO.sub.2, TiO.sub.2, CeO.sub.2, and MgO and a metal amide represented by a formula M(NH.sub.2).sub.x (where M represents one or more selected from Li, Na, K, Be, Mg, Ca, Sr, Ba, and Eu; and x represents a valence number of M) supported by the support base.

The invention relates to a process for the production of urea ammonium nitrate, a system and a method of modifying a plant. The process comprises treating ammonia-containing off-gas resulting from the production of ammonium nitrate (AN off-gas) with acidic scrubbing liquid in a finishing treatment section having a gas inlet in fluid communication with a gas outlet of a finishing section of a urea production unit, wherein the finishing section is adapted to solidify urea liquid, and wherein said finishing treatment section is adapted to subject ammonia-containing off-gas of the finishing section to treatment with an acidic scrubbing liquid.

Integrated process for the production of urea and urea-ammonium nitrate, comprising: reacting ammonia and carbon dioxide to form a reaction mixture (4) containing urea and unconverted materials, and also comprising the recovery of unconverted materials in a first recovery stage at a first pressure and in a second recovery stage at a second pressure, wherein ammonia-containing offgas (19) released by said second recovery stage are condensed at said second pressure, and said condensed offgas (20) are recycled to said first recovery stage.

Method and fluidized bed reactor for the production of granules, such as granules of urea or ammonium nitrate. The reactor comprises at least one granulation compartment with air inlets, and an air moving device downstream the granulation compartment, e.g., downstream one or more scrubbers. The air moving device is configured to draw air through said one or more air inlets into the granulation compartment.