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公开(公告)号：US20180201551A1
公开(公告)日：2018-07-19
申请号：US15742488
申请日：2016-07-06
Applicant: STAMICARBON B.V.
Inventor： Petrus Catharina Gerlach SOONS , Stefan H. SCHAAFSMA
Abstract: Disclosed is a method of making a granulate of a urea product comprising urea and a salt, such as urea ammonium sulfate, having a high content of the salt. The high content is such as to provide an amount of the salt above the limit of solubility of the salt in urea. The granulate of the invention is characterized by having a smooth surface, which, e.g. in the event of urea ammonium sulfate, is not normally the case for granulate having the aforementioned high ammonium sulfate content. According to the invention this is realized by dividing the feed liquids to granulation. This division is based on non-final granulation liquids of a sufficiently high content of the salt, and a final granulation liquid (determining the surface) having a salt content of below the solubility limit of the salt, or no salt at all. E.g. in the event of urea ammonium sulfate, the non-final granulation liquids possibly are a slurry of urea and more than 20 wt. % of ammonium sulfate. The final granulation liquid then has 0-20 wt. % of ammonium sulfate, i.e. below the solubility limit.
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公开(公告)号：US20190134554A1
公开(公告)日：2019-05-09
申请号：US16236097
申请日：2018-12-28
Applicant: Stamicarbon B.V.
IPC: B01D47/10 , B01D47/06 , C07C273/02
Abstract: Disclosed is a method for the removal of urea dust from the off-gas of a finishing section of a urea production plant. the method comprises subjecting the off-gas to quenching with water so as to produce quenched off-gas, and subjecting the quenched off-gas to scrubbing using at least one venturi scrubber. As a result, a lower pressure drop over the scrubber is attained, and a more efficient growth of urea particles, facilitating the removal thereof.
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公开(公告)号：US20160184758A1
公开(公告)日：2016-06-30
申请号：US14902831
申请日：2014-07-04
Applicant: STAMICARBON B.V.
IPC: B01D47/10
CPC classification number: B01D47/10 , B01D47/06 , C07C273/02
Abstract: Disclosed is a method for the removal of urea dust from the off- gas of a finishing section (1) of a urea production plant, the method comprises subjecting the off-gas to quenching with water (06) so as to produce quenched off-gas, and subjecting the quenched off-gas to scrubbing using at least one venturi scrubber (11). As a result, a lower pressure drop over the scrubber is attained, and a more efficient growth of urea particles, facilitating the removal thereof.
Abstract translation: 公开了一种从尿素生产设备的精加工部分（1）的废气中除去尿素灰尘的方法，该方法包括使废气用水淬火（06），以产生骤冷的， 气体，并使用至少一个文丘里洗涤器（11）对骤冷的废气进行洗涤。 因此，可以获得比洗涤器更低的压降，更有效地生长尿素颗粒，便于其去除。
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