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1. 发明申请

WO2023030997A1 A PLANT AND PROCESS FOR SEPARATING AN AMMONIA AND CARBON DIOXIDE CONTAINING WASTEWATER STREAM TO A CONCENTRATED AQUEOUS AMMONIA SOLUTION AND A PURIFIED WASTEWATER STREAM 审中-公开
公开(公告)号：WO2023030997A1
公开(公告)日：2023-03-09
申请号：PCT/EP2022/073608
申请日：2022-08-24
申请人： SULZER MANAGEMENT AG
发明人： RAISER, Thomas , LUCKE, Martin , MAZZOTTI, Marco , PÉREZ CALVO, José Francisco , OTGONBAYAR, Tuvshinjargal , NEGRI, Valentina
IPC分类号： B01D53/58 , C02F1/20 , C02F101/16 , C02F103/30 , C02F11/04
摘要： A process of treating an ammonia and carbon dioxide containing wastewater stream so as to produce a concentrated aqueous ammonia solution containing at least 5% by weight of dissolved ammonia and at most 20% by weight of dissolved carbon dioxide and a purified wastewater stream containing at most 1.000 ppm dissolved ammonia, wherein the process comprises the following steps: a) feeding the wastewater stream into a carbon dioxide degasser column comprising at least one bed of one or more random packings, at least one bed of one or more structured packings or at least one tray, wherein a first portion of the wastewater stream is fed at a position above at least one bed of one or more random packings, at least one bed of one or more structured packings or at least one tray and a second portion of the wastewater stream optionally in admixture with a portion of a liquid carbon dioxide depleted stream being withdrawn as bottom fraction from the carbon dioxide degasser column having a higher temperature than the first portion is fed at a position below at least one bed of one or more random packings, at least one bed of one or more structured packings or at least one tray the carbon dioxide degasser column, wherein the mass flow ratio of the first portion of the wastewater stream to the total wastewater stream fed into the carbon dioxide degasser column is 0.01 to 0.6, b) withdrawing a gaseous carbon dioxide rich stream containing less than 10% by weight of the ammonia contained in the wastewater stream as overhead fraction and the liquid carbon dioxide depleted stream having a pH value of 9.0 or higher as bottom fraction from the carbon dioxide degasser column, c) feeding the liquid carbon dioxide depleted stream into an ammonia stripper column, d) withdrawing a gaseous ammonia rich stream as overhead fraction and the purified wastewater stream containing at most 1.000 ppm dissolved ammonia as bottom fraction from the ammonia stripper column, wherein at least a portion of the liquid purified wastewater stream withdrawn from the ammonia stripper column is evaporated, wherein all or a portion of the evaporated portion is fed back into the ammonia stripper column, e) feeding the gaseous ammonia rich stream and separately therefrom water into a quencher column and withdrawing concentrated aqueous ammonia solution containing at least 5% by weight of dissolved ammonia and at most 20% by weight of dissolved carbon dioxide as bottom fraction from the quencher column.

2. 发明公开

EP4140566A1 A PLANT AND PROCESS FOR SEPARATING AN AMMONIA AND CARBON DIOXIDE CONTAINING WASTEWATER STREAM TO A CONCENTRATED AQUEOUS AMMONIA SOLUTION AND A PURIFIED WASTEWATER STREAM 无效
公开(公告)号：EP4140566A1
公开(公告)日：2023-03-01
申请号：EP21194125.7
申请日：2021-08-31
申请人： Sulzer Management AG
发明人： RAISER, Thomas , LUCKE, Martin , MAZZOTTI, Marco , PÉREZ CALVO, José Francisco , OTGONBAYAR, Tuvshinjargal , NEGRI, Valentina
IPC分类号： B01D53/58 , C02F1/20 , C02F101/16 , C02F103/30 , C02F11/04
摘要： A process of treating an ammonia and carbon dioxide containing wastewater stream so as to produce a concentrated aqueous ammonia solution containing at least 5% by weight of dissolved ammonia and at most 20% by weight of dissolved carbon dioxide and a purified wastewater stream containing at most 1.000 ppm dissolved ammonia, wherein the process comprises the following steps:
a) feeding the wastewater stream into a carbon dioxide degasser column comprising at least one bed of one or more random packings, at least one bed of one or more structured packings or at least one tray, wherein a first portion of the wastewater stream is fed at a position above at least one bed of one or more random packings, at least one bed of one or more structured packings or at least one tray and a second portion of the wastewater stream optionally in admixture with a portion of a liquid carbon dioxide depleted stream being withdrawn as bottom fraction from the carbon dioxide degasser column having a higher temperature than the first portion is fed at a position below at least one bed of one or more random packings, at least one bed of one or more structured packings or at least one tray the carbon dioxide degasser column, wherein the mass flow ratio of the first portion of the wastewater stream to the total wastewater stream fed into the carbon dioxide degasser column is 0.01 to 0.6,
b) withdrawing a gaseous carbon dioxide rich stream containing less than 10% by weight of the ammonia contained in the wastewater stream as overhead fraction and the liquid carbon dioxide depleted stream as bottom fraction from the carbon dioxide degasser column,
c) feeding the liquid carbon dioxide depleted stream into an ammonia stripper column,
d) withdrawing a gaseous ammonia rich stream as overhead fraction and the purified wastewater stream containing at most 1.000 ppm dissolved ammonia as bottom fraction from the ammonia stripper column,
e) feeding the gaseous ammonia rich stream and separately therefrom water into a quencher column and withdrawing concentrated aqueous ammonia solution containing at least 5% by weight of dissolved ammonia and at most 20% by weight of dissolved carbon dioxide as bottom fraction from the quencher column.

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