Improved methods for the synthesis of urea

    公开(公告)号:JP5378361B2

    公开(公告)日:2013-12-25

    申请号:JP2010508743

    申请日:2008-05-19

    Abstract: An enhanced process is described for the synthesis of urea from ammonia and carbon dioxide, at a high pressure and temperature, with the formation of ammonium carbamate as intermediate, which includes a high pressure synthesis section, comprising at least one separation step by decomposition-stripping with ammonia of the non-converted ammonium carbamate, carried out in a vertical apparatus, commonly called stripper, characterized in that said step also comprises a feeding, in the lower part of said stripper, of a stream of CO2, heated to a temperature ranging from 130 to 230° C., in a quantity of 1 to 15% by weight with respect to the total weight of the fresh CO2 fed to the process, containing a passivating agent in such a quantity that its equivalent content of O2 in moles varies from 0.05% to 0.80% with respect to the moles of CO2 of said stream.

    Method and apparatus for recovering ammonia from the gas stream

    公开(公告)号:JP2013500230A

    公开(公告)日:2013-01-07

    申请号:JP2012522033

    申请日:2010-07-27

    Abstract: 本発明は、ガス流中に含まれるアンモニアを回収するための方法に係り、該方法は、以下の段階:(a) アンモニアを含む該ガス流を、7.0よりも低いpHを持つ水性洗浄溶液による洗浄処理に付して、精製されたガス流およびアンモニウム塩を含む水性溶液を生成する段階;(b) 前記段階(a)を由来とする、該アンモニウム塩を含む水性溶液を、縦型の落下液膜式熱交換器内で、50〜250℃なる範囲の温度および50KPa〜4MPaなる範囲の絶対圧力にて処理して、再生された洗浄溶液およびNH
    3 とH
    2 Oとを含むガス流を生成する段階;および(c) 該再生された洗浄溶液を前記段階(a)に再循環する段階を含む。 本発明は、また上記方法を実施するための装置にも係る。

    AN ARRANGEMENT AND A METHOD FOR THE INSTALLATION OF DATA AND ELECTRICAL TRANSMISSION LINES ON A STEEL LAZY WAVE RISER (SLWR)

    公开(公告)号:US20240287855A1

    公开(公告)日:2024-08-29

    申请号:US18569153

    申请日:2022-04-07

    Applicant: SAIPEM S.P.A.

    CPC classification number: E21B17/015

    Abstract: An arrangement of an umbilical of data communication lines and/or electrical energy transmission lines is mounted on a lazy wave catenary riser. The umbilical has a first section extending from an upper hang off location of the riser continuously downward to a first installation point at the riser and a second section extending from a second installation point at the riser continuously downward to the sea bed at a riser touch down location. The first installation point is positioned in an installation region of the riser between a lowest sag bend point and a highest hog bend point of the lazy wave catenary riser extension. The first 1 section is tensioned to a flatter catenary shape than a catenary shape of the riser between the upper hang off location and the first installation point, so that a portion of the first section extends detached from the riser.

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