JOINT PRODUCTION OF METHANOL, AMMONIA AND UREA Russian patent published in 2022 - IPC C07C29/151 C01C1/04 C07C273/10 C01B3/02 C07C31/04 

FIELD: gas industry.

SUBSTANCE: present invention relates to a method for the joint production of methanol, ammonia and urea from hydrocarbon raw materials. The method includes following stages: a) obtaining from the first direct-flow methanol process, including the first stage of reforming and the first stage of methanol synthesis, the first outlet stream containing methanol and the first exhaust gas containing hydrogen, nitrogen and unconverted carbon oxides, and obtaining from the second direct-flow methanol process, including the second stage of reforming and the second stage of methanol synthesis, the second outlet stream containing methanol and the second exhaust gas containing hydrogen, nitrogen and unconverted carbon oxides; wherein the first stage of methanol synthesis is carried out in parallel with the second stage of methanol synthesis; b) production of ammonia synthesis gas from the first and/or the second exhaust gas at the general stage of catalytic methanation, and extraction of the specified ammonia synthesis gas preferably having a molar ratio of H₂:N₂ equal to about 3:1; c) catalytic conversion of nitrogen and hydrogen of ammonia synthesis gas at the general stage of ammonia synthesis, and extraction of the outlet stream containing ammonia and a purge gas stream containing hydrogen, nitrogen and/or methane; and d) interaction of at least part of the exhaust stream containing ammonia with at least part of exhaust gas containing CO₂ from at least one of the first and the second stages of reforming to produce urea.

EFFECT: present invention allows for avoiding emissions into the atmosphere of carbon dioxide captured from synthesis gas of methanol and ammonia, and using expensive stages of water gas conversion and carbon dioxide removal.

12 cl, 1 dwg, 1 tbl