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    Process for the production of formaldehyde-stabilized urea
    3.
    发明授权
    Process for the production of formaldehyde-stabilized urea 有权

    公开(公告)号：US10759744B2

    公开(公告)日：2020-09-01

    申请号：US16500441

    申请日：2018-03-22

    申请人： JOHNSON MATTHEY PUBLIC LIMITED COMPANY

    发明人： Sam Barker ,  Thomas Davison ,  John David Pach

    IPC分类号： C07C273/02 ,  C07C29/151 ,  C01C1/04 ,  C07C45/38 ,  C01B3/34

    摘要： A process for the production of formaldehyde-stabilised urea is described comprising the steps of: (a) generating a synthesis gas; (b) subjecting the synthesis gas to one or more stages of water-gas shift in one or more water-gas shift reactors to form a shifted gas; (c) cooling the shifted gas to below the dew point and recovering condensate to form a dried shifted gas; (d) recovering carbon dioxide from the dried shifted gas in a carbon dioxide removal unit to form a carbon dioxide-depleted synthesis gas; (e) synthesising methanol from the carbon dioxide-depleted synthesis gas in a methanol synthesis unit and recovering the methanol and a methanol synthesis off-gas; (f) subjecting at least a portion of the recovered methanol to oxidation with air to form formaldehyde in a stabiliser production unit; (g) subjecting the methanol synthesis off-gas to methanation in a methanation reactor containing a methanation catalyst to form an ammonia synthesis gas; (h) synthesising ammonia from the ammonia synthesis gas in an ammonia production unit and recovering the ammonia; (i) reacting a portion of the ammonia and at least a portion of the recovered carbon dioxide stream in a urea production unit to form a urea stream; and (j) stabilising the urea by mixing the urea stream and a stabiliser prepared using the formaldehyde produced in the stabiliser production unit, wherein the carbon dioxide removal unit operates by means of absorption using a liquid absorbent and comprises an absorbent regeneration unit, wherein the process includes recovering a carbon dioxide-containing gas stream from the absorbent regeneration unit, compressing at least a portion of the recovered carbon dioxide-containing gas stream to form a compressed carbon dioxide-containing gas stream and passing the compressed carbon dioxide-containing gas stream to the methanol synthesis unit.

    Process for revamping an ammonia plant
    4.
    发明授权
    Process for revamping an ammonia plant 有权

    公开(公告)号：US11097944B2

    公开(公告)日：2021-08-24

    申请号：US16078846

    申请日：2017-02-06

    申请人： JOHNSON MATTHEY PUBLIC LIMITED COMPANY

    发明人： John David Pach ,  Colin William Park

    IPC分类号： C01B3/02 ,  C01B3/48 ,  C01C1/04 ,  C10K3/04 ,  B01J35/10 ,  B01J35/02 ,  B01J23/86 ,  B01J23/745 ,  C10G35/02 ,  C10G59/02

    摘要： A method is described for revamping an ammonia production facility said ammonia production facility having a front end comprising one or more reformers fed with a hydrocarbon feedstock at a hydrocarbon feed stock feed rate and a high-temperature shift reactor fed with a reformed gas obtained from said one or more reformers and containing a fixed bed of iron-containing water-gas shift catalyst, said front end operating at a first steam-to-carbon ratio and a first pressure drop, said method comprising the steps of (i) replacing the iron-containing water-gas shift catalyst with a low-steam water-gas shift catalyst to form a modified front end, (ii) operating the modified front end at a second steam-to-carbon ratio and a second pressure drop, wherein the second steam-to-carbon ratio is at least 0.2 less than the first steam-to-carbon ratio and the second pressure drop is less than the first pressure drop, and (iii) increasing the hydrocarbon feed stock feed rate to said one or more reformers.

    Process for the production of formaldehyde-stabilized urea
    5.
    发明授权
    Process for the production of formaldehyde-stabilized urea 有权

    公开(公告)号：US10479761B2

    公开(公告)日：2019-11-19

    申请号：US16344610

    申请日：2017-10-03

    申请人： JOHNSON MATTHEY PUBLIC LIMITED COMPANY

    发明人： Thomas Davison ,  John David Pach

    IPC分类号： C07C273/02 ,  C07C273/04 ,  C07C273/16 ,  C07C31/04 ,  C01C1/04 ,  C01B3/02 ,  C07C29/151

    摘要： An integrated process for the production of a formaldehyde-stabilised urea is described comprising the steps of: (a) generating a synthesis gas comprising hydrogen, nitrogen, carbon monoxide, carbon dioxide and steam in a synthesis gas generation unit; (b) dividing the synthesis gas into a first synthesis gas stream and a smaller second synthesis gas stream; (c) subjecting the first synthesis gas stream to one or more stages of water-gas shift in one or more water-gas shift reactors to form a shifted gas; (d) cooling the shifted gas to below the dew point and recovering condensate to form a dried shifted gas; (e) recovering carbon dioxide from the dried shifted gas in a carbon dioxide removal unit to form a carbon dioxide-depleted synthesis gas; (f) subjecting the carbon dioxide-depleted synthesis gas to a stage of methanation in one or more methanation reactors to form an ammonia synthesis gas; (g) synthesising ammonia from the ammonia synthesis gas in an ammonia production unit and recovering the ammonia; (h) reacting a portion of the ammonia and at least a portion of the recovered carbon dioxide stream in a urea production unit to form a urea stream; and (i) stabilising the urea by mixing the urea stream and a stabiliser prepared using formaldehyde to form a stabilised urea, wherein the formaldehyde is generated by steps comprising; (1) passing the second portion of synthesis gas through a scrubber to remove contaminants therefrom and form a scrubbed synthesis gas; (2) synthesising methanol from the scrubbed synthesis gas in a methanol synthesis unit, and recovering the methanol and a methanol synthesis off-gas; (3) combining the methanol synthesis off-gas with the shifted gas and (4) subjecting at least a portion of the recovered methanol to oxidation with air in a formaldehyde stabiliser production unit to produce formaldehyde.

    Process for making ammonia
    7.
    发明授权
    Process for making ammonia 有权

    公开(公告)号：US10435304B2

    公开(公告)日：2019-10-08

    申请号：US15541406

    申请日：2016-01-11

    申请人： JOHNSON MATTHEY PUBLIC LIMITED COMPANY

    发明人： John David Pach ,  Daniel Sheldon ,  David Wails

    IPC分类号： C01C1/04 ,  B01J23/89 ,  C01B3/02 ,  B01J23/56

    摘要： A process for production of ammonia includes: providing a reaction stream including carbon monoxide and hydrogen; passing the reaction stream and steam over a water gas shift catalyst in a catalytic shift reactor, forming a shifted gas mixture depleted in carbon monoxide and enriched in hydrogen; passing the shifted gas mixture with an oxygen-containing gas over a selective oxidation catalyst at ≥175° C., forming a selectively oxidized gas stream with a portion of the carbon monoxide converted to carbon dioxide; removing some of the carbon dioxide from the selectively oxidized gas stream in a carbon dioxide removal unit; passing the carbon dioxide depleted stream over a methanation catalyst in a methanator to form a methanated gas stream, optionally adjusting its hydrogen:nitrogen molar ratio to form an ammonia synthesis gas; and passing the ammonia synthesis gas over an ammonia synthesis catalyst in an ammonia converter to form ammonia.