Process for the co-production of methanol and ammonia together with urea production from a hydrocarbon feed without venting to the atmosphere carbon dioxide captured from the methanol or ammonia synthesis gas and without using expensive air separation units and water gas shift. Carbon dioxide removal from flue gas from reforming section to convert partially or fully all ammonia into urea. Synergi of having methanol, ammonia and urea production to produce coating material for the urea production.

Process for the co-production of methanol and ammonia together with urea production from a hydrocarbon feed without venting to the atmosphere carbon dioxide captured from the methanol or ammonia synthesis gas and without using expensive air separation units and water gas shift. Carbon dioxide removal from flue gas from reforming section to convert partially or fully all ammonia into urea. Synergi of having methanol, ammonia and urea production to produce coating material for the urea production.

A process for producing formaldehyde-stabilised urea is described comprising generating a synthesis gas, subjecting the synthesis gas to water-gas shift to form a shifted gas; recovering carbon dioxide from the shifted gas; synthesising methanol from the carbon dioxide-depleted synthesis gas; subjecting recovered methanol to oxidation; subjecting the methanol synthesis off-gas to methanation; synthesising ammonia from the ammonia synthesis gas and recovering the ammonia; reacting ammonia and recovered carbon dioxide stream to form a urea stream; and stabilising the urea by mixing the urea stream and a stabiliser prepared using the recovered formaldehyde, wherein a portion of the synthesis gas by-passes either the one or more of the water-gas shift reactors, carbon dioxide removal unit, or water-gas shift reactors and the carbon dioxide removal unit used in the process.

A process for producing formaldehyde-stabilised urea is described comprising generating a synthesis gas, subjecting the synthesis gas to water-gas shift to form a shifted gas; recovering carbon dioxide from the shifted gas; synthesising methanol from the carbon dioxide-depleted synthesis gas; subjecting recovered methanol to oxidation; subjecting the methanol synthesis off-gas to methanation; synthesising ammonia from the ammonia synthesis gas and recovering the ammonia; reacting ammonia and recovered carbon dioxide stream to form a urea stream; and stabilising the urea by mixing the urea stream and a stabiliser prepared using the recovered formaldehyde, wherein a portion of the synthesis gas by-passes either the one or more of the water-gas shift reactors, carbon dioxide removal unit, or water-gas shift reactors and the carbon dioxide removal unit used in the process.

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.

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.

A process for the production of ammonia and urea in an ammonia-urea integrated plant comprising an ammonia section and a tied-in urea section, wherein a hydrocarbon is reformed to produce ammonia make-up synthesis gas; said make-up gas is purified by shift conversion and removal of carbon dioxide; carbon dioxide is removed from the make-up gas by a first and a second CO2 removal sections;the first section removes CO2 by absorption with a suitable medium, and the second section removes CO2 by washing with a carbamate solution taken from the urea section; the make-up gas is reacted to produce ammonia; the CO2 removed from the make-up gas and at least part of the ammonia are used to produce urea.

A process for the production of ammonia and urea in an ammonia-urea integrated plant comprising an ammonia section and a tied-in urea section, wherein a hydrocarbon is reformed to produce ammonia make-up synthesis gas; said make-up gas is purified by shift conversion and removal of carbon dioxide; carbon dioxide is removed from the make-up gas by a first and a second CO2 removal sections;the first section removes CO2 by absorption with a suitable medium, and the second section removes CO2 by washing with a carbamate solution taken from the urea section; the make-up gas is reacted to produce ammonia; the CO2 removed from the make-up gas and at least part of the ammonia are used to produce urea.

The invention relates to a process for preparing ammonia gas and CO.sub.2 for urea synthesis. In the process of the invention, a process gas containing nitrogen, hydrogen and carbon dioxide as main components is produced from a metallurgical gas. The metallurgical gas consists of blast furnace gas, or contains blast furnace gas at least as a mixing component. The process gas is fractionated to give a gas stream containing the CO.sub.2 component and a gas mixture consisting primarily of N.sub.2 and H.sub.2. An ammonia gas suitable for the urea synthesis is produced from the gas mixture by means of ammonia synthesis. CO.sub.2 is branched off from the CO.sub.2-containing gas stream in a purity and amount suitable for the urea synthesis.

The invention relates to a process for preparing ammonia gas and CO.sub.2 for urea synthesis. In the process of the invention, a process gas containing nitrogen, hydrogen and carbon dioxide as main components is produced from a metallurgical gas. The metallurgical gas consists of blast furnace gas, or contains blast furnace gas at least as a mixing component. The process gas is fractionated to give a gas stream containing the CO.sub.2 component and a gas mixture consisting primarily of N.sub.2 and H.sub.2. An ammonia gas suitable for the urea synthesis is produced from the gas mixture by means of ammonia synthesis. CO.sub.2 is branched off from the CO.sub.2-containing gas stream in a purity and amount suitable for the urea synthesis.