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    • 2. 发明申请
    • PROCESS FOR THE PRODUCTION OF FORMALDEHYDE-STABILISED UREA
    • 生产甲醛稳定的尿素的方法
    • WO2018078318A1
    • 2018-05-03
    • PCT/GB2017/052965
    • 2017-10-03
    • JOHNSON MATTHEY PUBLIC LIMITED COMPANY
    • DAVISON, ThomasPACH, John David
    • C07C273/02C07C273/04
    • 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.
    • 描述了一种用于生产甲醛稳定的尿素的综合方法,其包括以下步骤:(a)在合成气体中生成包含氢气,氮气,一氧化碳,二氧化碳和蒸汽的合成气体 发电单位; (b)将合成气分成第一合成气流和较小的第二合成气流; (c)使第一合成气流在一个或多个水煤气变换反应器中经历一个或多个水煤气变换阶段以形成变换气体; (d)将转化的气体冷却至露点以下并回收冷凝物以形成干燥的转化气体; (e)在二氧化碳脱除单元中从干燥的转化气体中回收二氧化碳以形成贫二氧化碳的合成气; (f)使贫二氧化碳合成气在一个或多个甲烷化反应器中进行甲烷化阶段以形成氨合成气; (g)在氨生产装置中从氨合成气合成氨并回收氨; (h)使一部分氨和至少一部分回收的二氧化碳流在尿素生产单元中反应以形成尿素流; 和(i)通过混合尿素流和使用甲醛制备的稳定剂以形成稳定的脲来稳定尿素,其中所述甲醛通过以下步骤产生: (1)使合成气的第二部分通过洗涤器以从其中除去污染物并形成洗涤过的合成气; (2)在甲醇合成装置中从洗涤过的合成气合成甲醇,并回收甲醇和甲醇合成废气; (3)将甲醇合成废气与变换气体合并,以及(4)使至少一部分回收的甲醇在空气中在甲醛稳定剂生产单元中氧化以产生甲醛。