The present invention is a urea production method, including: a first concentration step of concentrating an aqueous urea solution; a granulation step of producing solid urea from the concentrated urea solution generated in the first concentration step; a urea recovery step of treating exhaust gas from the granulation step and recovering urea dust in the exhaust gas to generate a recovered aqueous urea solution, the granulation step being configured so as to treat a concentrated urea solution containing an additive; and a second concentration step of concentrating the recovered aqueous urea solution as an additional concentration step, wherein the concentrated recovered urea solution generated in the second concentration step is joined to the concentrated urea solution in the downstream of the first concentration step, and an additive is added downstream of the first concentration step. The present invention can produce a urea solution containing no additive for producing solid urea, while using the additive.

The present invention is a urea production method, including: a first concentration step of concentrating an aqueous urea solution; a granulation step of producing solid urea from the concentrated urea solution generated in the first concentration step; a urea recovery step of treating exhaust gas from the granulation step and recovering urea dust in the exhaust gas to generate a recovered aqueous urea solution, the granulation step being configured so as to treat a concentrated urea solution containing an additive; and a second concentration step of concentrating the recovered aqueous urea solution as an additional concentration step, wherein the concentrated recovered urea solution generated in the second concentration step is joined to the concentrated urea solution in the downstream of the first concentration step, and an additive is added downstream of the first concentration step. The present invention can produce a urea solution containing no additive for producing solid urea, while using the additive.

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.

A method for producing a SNCR/SCR solution, comprising the steps of: a) reacting ammonia and carbon dioxide in a high pressure section, thereby obtaining an aqueous composition comprising urea and ammonium salts; b) processing the aqueous composition obtained in step a), thereby obtaining a first aqueous solution comprising urea, and a second aqueous solution comprising ammonium salts; and c) diluting the second aqueous solution comprising ammonium salts obtained in step b) with a third aqueous solution, thereby producing the SNCR/SCR solution. The present disclosure also provides the use of an aqueous stream comprising ammonium salts from a urea-producing plant for producing a SNCR/SCR solution.

A method for producing a SNCR/SCR solution, comprising the steps of: a) reacting ammonia and carbon dioxide in a high pressure section, thereby obtaining an aqueous composition comprising urea and ammonium salts; b) processing the aqueous composition obtained in step a), thereby obtaining a first aqueous solution comprising urea, and a second aqueous solution comprising ammonium salts; and c) diluting the second aqueous solution comprising ammonium salts obtained in step b) with a third aqueous solution, thereby producing the SNCR/SCR solution. The present disclosure also provides the use of an aqueous stream comprising ammonium salts from a urea-producing plant for producing a SNCR/SCR solution.

Method for producing solid urea by granulation, wherein the granulation is fed with liquid urea having a purity greater than 98% by weight and not containing formaldehyde.

Method for producing solid urea by granulation, wherein the granulation is fed with liquid urea having a purity greater than 98% by weight and not containing formaldehyde.

A process for the co-production of methanol and ammonia is described comprising the steps of: (a) forming a first synthesis gas stream by reacting a first portion of a hydrocarbon feedstock and steam in a steam reformer, (b) forming a second synthesis gas stream in parallel to the first synthesis gas stream by reacting a second portion of the hydrocarbon feedstock with an oxygen-containing gas and steam in an autothermal reformer, (c) synthesising methanol from a first process gas comprising the first synthesis gas stream, and (d) synthesising ammonia from a second process gas prepared from the second synthesis gas stream, wherein a purge stream containing hydrogen is recovered from the methanol synthesis step (c) and a portion of the purge gas stream is fed to the autothermal reformer and/or the second synthesis gas in step (b).