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公开(公告)号：US10369493B2
公开(公告)日：2019-08-06
申请号：US14424639
申请日：2013-08-28
Applicant: CAP III B.V.
Inventor： Geert Ekkelenkamp , Johan Thomas Tinge , Pieter Vonk
Abstract: A continuous process for producing crystalline ammonium sulfate, said process comprising a start-up operation followed by a steady-state operation, wherein the start-up operation comprises: i) in a crystallizer, evaporating solvent from an approximately saturated ammonium sulfate solution; ii) replacing evaporated solvent with further approximately proximately saturated ammonium sulfate solution; iii) introducing to the crystallizer seed crystals of ammonium sulfate; iv) continuing to evaporate solvent, until a desired degree of supersaturation is reached; and v) recovering crystalline ammonium sulfate from ammonium sulfate solution in a recovery unit, and the steady-state operation comprises: vi) continuously feeding approximately saturated ammonium sulfate solution into the crystallizer and continuously withdrawing ammonium sulfate crystals from the crystallizer, such that the total combined volume of ammonium sulfate solution and ammonium sulfate crystals within the crystallizer remains constant; and vii) recovering crystalline ammonium sulfate from ammonium sulfate solution in a recovery unit, characterized in that the degree of supersaturation in the crystallizer during the start-up operation is maintained between 1.2% and the point at which primary nucleation occurs; and apparatus suitable for carrying out the process.
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公开(公告)号：US09676633B2
公开(公告)日：2017-06-13
申请号：US14425419
申请日：2013-09-12
Applicant: CAP III B.V.
Inventor： Geert Ekkelenkamp , Johan Thomas Tinge , Pieter Vonk
CPC classification number: C01C1/248 , B01D9/0031 , B01D9/0036 , B01D9/0063 , C01C1/24 , C05C3/005
Abstract: The invention relates to a process for preparing a crystalline ammonium sulfate product, which process comprises: a) subjecting in a crystallizer a feed solution of ammonium sulfate to crystallization to form a first slurry of ammonium sulfate crystals; b) subjecting the first slurry of ammonium sulfate crystals to a first size classification to yield a first coarse ammonium sulfate crystal fraction and a first fine ammonium sulfate crystal fraction; c) recycling at least part of the first fine ammonium sulfate crystal fraction to the feed solution of ammonium sulfate; and d) recovering a crystalline ammonium sulfate product from the first coarse ammonium sulfate crystal fraction, characterized in that: e) a second size classification is carried out on a second slurry of ammonium sulfate crystals to yield a second coarse ammonium sulfate crystal fraction and a second fine ammonium sulfate crystal fraction.
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