公开(公告)号：US09199926B2

公开(公告)日：2015-12-01

申请号：US14371144

申请日：2013-01-09

Applicant: SAIPEM S.p.A.

Inventor： Lino Carlessi ,  Alessandro Gianazza

IPC: C07C273/04 ,  B01D3/00

CPC classification number: C07C273/04 ,  B01D3/009 ,  Y02P20/142 ,  Y02P20/582

Abstract: A process for the direct synthesis of urea from ammonia and carbon dioxide with increased corrosion resistance, comprising, in the high-pressure synthesis section, a reaction step in a vertical reactor fed with at least one stream of fresh carbon dioxide containing a passivating agent and a decomposition-stripping step of the non-converted reagents, wherein the gas-liquid mixture collected at the head of the reactor is separated into a gaseous stream and a liquid stream fed to the tail and head of the stripper, respectively.

Abstract translation: 一种用于从具有增加的耐腐蚀性的氨和二氧化碳直接合成尿素的方法，包括在高压合成段中在垂直反应器中的反应步骤，该反应器供应至少一种含有钝化剂的新鲜二氧化碳流和 未转化试剂的分解汽提步骤，其中在反应器头部收集的气液混合物分离成气态物流和分别送入汽提塔尾部和头部的液体流。

公开(公告)号：US09669360B2

公开(公告)日：2017-06-06

申请号：US14960662

申请日：2015-12-07

Applicant: SAIPEM S.p.A

Inventor： Paolo Casara ,  Alessandro Gianazza

IPC: C02F1/02 ,  B01D3/02 ,  B01D3/14 ,  B01D35/18 ,  B01D61/36 ,  C01C1/10 ,  C07C273/04 ,  C02F1/04 ,  C02F1/44 ,  C02F101/10 ,  C02F101/16 ,  C02F103/36

CPC classification number: B01D61/364 ,  B01D2313/22 ,  C01C1/10 ,  C02F1/04 ,  C02F1/44 ,  C02F1/447 ,  C02F2101/10 ,  C02F2101/16 ,  C02F2103/36 ,  C07C273/04

Abstract: The present invention relates to a method for contemporaneously recovering ammonia and carbon dioxide from an aqueous solution thereof, possibly comprising their condensates, in a synthesis process of urea, characterized in that it comprises a hydrophobic microporous membrane distillation phase of an aqueous solution comprising ammonia, carbon dioxide and their saline compounds or condensates, said distillation being carried out at a temperature ranging from 50 to 250° C. and a pressure ranging from 50 KPa to 20 MPa absolute, with the formation of a residual aqueous solution, possibly comprising urea, and a gaseous permeate stream, comprising ammonia, carbon dioxide and water. The present invention also relates to an apparatus for effecting the above method and a production process of urea which comprises the above method.

公开(公告)号：US20150025273A1

公开(公告)日：2015-01-22

申请号：US14371144

申请日：2013-01-09

Applicant: SAIPEM S.p.A.

Inventor： Lino Carlessi ,  Alessandro Gianazza

IPC: C07C273/04 ,  B01D3/00

CPC classification number: C07C273/04 ,  B01D3/009 ,  Y02P20/142 ,  Y02P20/582

Abstract: A process for the direct synthesis of urea from ammonia and carbon dioxide with increased corrosion resistance, comprising, in the high-pressure synthesis section, a reaction step in a vertical reactor fed with at least one stream of fresh carbon dioxide containing a passivating agent and a decomposition-stripping step of the non-converted reagents, wherein the gas-liquid mixture collected at the head of the reactor is separated into a gaseous stream and a liquid stream fed to the tail and head of the stripper, respectively.

Abstract translation: 一种用于从具有增加的耐腐蚀性的氨和二氧化碳直接合成尿素的方法，包括在高压合成段中在垂直反应器中的反应步骤，该反应器供应至少一种含有钝化剂的新鲜二氧化碳流和 未转化试剂的分解汽提步骤，其中在反应器头部收集的气液混合物分离成气态物流和分别送入汽提塔尾部和头部的液体流。

公开(公告)号：US20140081046A1

公开(公告)日：2014-03-20

申请号：US14116258

申请日：2012-05-03

Applicant: Saipem S.P.A.

Inventor： Lino Carlessi ,  Alessandro Gianazza

IPC: C07C273/04

CPC classification number: C07C273/04 ,  B01J2219/00006 ,  B01J2219/00024 ,  C07C213/04 ,  Y10T29/49716

Abstract: A process for the direct synthesis of urea from ammonia and carbon dioxide at high pressures and temperatures, with the formation of ammonium carbamate as intermediate, comprising a decomposition step of the ammonium carbamate and stripping of the gases formed, operating substantially at the same pressure as the synthesis step, wherein the recycled liquid streams are fed, at least partially, to the same decomposition and stripping step after being preheated by heat exchange with a stream included in the high-pressure synthesis cycle.

Abstract translation: 一种在高压和高温下从氨和二氧化碳直接合成尿素的方法，其中形成氨基甲酸铵作为中间体，包括氨基甲酸铵的分解步骤和汽提形成的气体，其操作基本上与 合成步骤，其中在通过与包括在高压合成循环中的流的热交换进行预热之后，将再循环的液体流至少部分地进料至相同的分解和汽提步骤。