公开(公告)号：US11027984B2

公开(公告)日：2021-06-08

申请号：US16482864

申请日：2018-03-07

Applicant: Haldor Topsøe A/S

Inventor： Christian Henrik Speth ,  Per Juul Dahl ,  Annette E. Kroll Jensen ,  Niels Christian Schjødt ,  Marcus Symreng

IPC: C01C1/04 ,  C01B3/02 ,  B01D19/00 ,  B01J23/80 ,  C01B3/48 ,  C01B3/52 ,  C07C273/10

Abstract: A process for producing urea with controlled excess of CO2 and/or NH3. The process includes the steps of: reforming the hydrocarbon feed gas, thereby obtaining a synthesis gas comprising CH4, CO, CO2, H2 and H2O, shifting the synthesis gas, removing CO2 from the synthesis gas, removing residual H2O and/or CO2 from the synthesis gas, removing CH4, CO, Ar and/or He, and adding stoichiometric nitrogen to produce NH3 to the synthesis gas, synthesizing NH3 to obtain a NH3 product, and adding at least part of the product CO2 and at least part of the NH3 product to a urea synthesis step to make a urea product. The amount of excess CO2 and/or NH3 is controlled by adjusting the steam/carbon in the reforming step and/or the H2O addition upstream the shift step and/or adjusting the inlet temperature to at least one or more shift steps.

公开(公告)号：US20200231456A1

公开(公告)日：2020-07-23

申请号：US16482864

申请日：2018-03-07

Applicant: Haldor Topsøe A/S

Inventor： Christian Henrik Speth ,  Per Juul Dahl ,  Annette E. Kroll Jensen ,  Niels Christian Schjødt ,  Marcus Symreng

IPC: C01C1/04 ,  C01B3/02 ,  C01B3/48 ,  C01B3/52 ,  B01D19/00 ,  B01J23/80

Abstract: A process for producing UREA, said process comprising the steps of:—purification of a hydrocarbon feed gas removing Sulphur and/or chloride components if present, —reforming the hydrocarbon feed gas in a reforming step where the steam/carbon ratio is less than 2.6 thereby obtaining a synthesis gas comprising CH4, CO, CO2, H2 and H2O, —optionally adding H2O to the synthesis gas from the reforming step maintaining an overall steam/carbon less than 2.6, —shifting the synthesis gas in a shift section comprising one or more shift steps preferably in series, —optionally washing the synthesis gas leaving the shift section with water, —removing CO2 from the synthesis gas from the shift section in a CO2 removal step to obtain a synthesis gas with less than 500 ppm CO2, preferably less than 20 ppm CO2 and a CO2 product gas, —removing residual H2O and/or CO2 from the synthesis gas preferably in an absorbent step, —removing CH4, CO, Ar and/or He preferably in a nitrogen wash unit and adding stoichiometric nitrogen to produce NH3 to the synthesis gas, —synthesizing NH3 to obtain a NH3 product, —adding at least part of the product CO2 and at least part of the NH3 product to a UREA synthesis step to make a UREA product, Wherein the amount of excess CO2 and/or NH3 is controlled by adjusting the steam/carbon in the reforming step and/or the H2O addition upstream the shift step and/or adjusting the inlet temperature to at least one of the one or more shift steps.