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1. 发明申请

WO2017093387A1 METHOD OF REMOVING CO2 FROM A CONTAMINATED HYDROCARBON STREAM 审中-公开
标题翻译：从污染的烃流中去除CO2的方法
公开(公告)号：WO2017093387A1
公开(公告)日：2017-06-08
申请号：PCT/EP2016/079403
申请日：2016-12-01
申请人： SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. , SHELL OIL COMPANY
发明人： POORTE, Raimo, Edwin, Gregor , VAN AKEN, Michiel, Gijsbert , VAN CAMPEN, Laurens, Joseph, Arnold, Marie , VAN SANTEN, Helmar
IPC分类号： F25J3/06 , F25J1/00
CPC分类号： F25J3/061 , B01D43/00 , B01D53/002 , B01D2256/245 , B01D2257/504 , F25J1/0022 , F25J1/0035 , F25J1/0037 , F25J1/004 , F25J1/0202 , F25J3/0635 , F25J3/067 , F25J2205/10 , F25J2205/20 , F25J2205/84 , F25J2210/04 , F25J2215/04 , F25J2220/66 , F25J2230/30 , F25J2230/60 , F25J2235/60 , F25J2240/02 , F25J2245/02 , F25J2245/90 , F25J2270/04 , F25J2270/88 , Y02C10/12
摘要： The present invention provides a method to separate CO2 from a contaminated hydrocarbon-containing stream. The method comprises obtaining a multiphase contaminated hydrocarbon-containing stream (100) containing at least a vapour phase, a liquid phase and a solid phase, creating a slurry stream (120) from the multiphase stream. The slurry stream is fed to a crystallization chamber comprising CO2 seed particles. A liquid hydrocarbon stream (170) is obtained from the crystallization chamber (91) and a concentrated slurry (140) is obtained. The concentrated slurry (140) is removed from the crystallization chamber (91) by means of an extruder (142), thereby obtaining solid CO2. A feedback stream (141) is obtained from the solid CO2 comprising CO2 seed particles having an average size greater than 100 micron. The feedback stream (141) is passed into the crystallization chamber (91).
摘要翻译：本发明提供了从受污染的含烃流中分离CO 2的方法。该方法包括获得包含至少气相，液相和固相的多相污染的含烃流（100），从多相流产生淤浆流（120）。将浆料流进料至包含CO 2种子颗粒的结晶室。从结晶室（91）获得液态烃料流（170）并获得浓缩浆料（140）。通过挤出机（142）将浓缩浆料（140）从结晶室（91）中移出，由此获得固体CO 2。反馈流（141）从包含平均尺寸大于100微米的CO 2种子颗粒的固体CO 2获得。反馈流（141）被送入结晶室（91）。

2. 发明申请

WO2013041545A1 SYSTEM AND METHOD FOR REMOVING CONTAMINANTS FROM A CONTAMINATED GAS STREAM 审中-公开
标题翻译：从污染气流中去除污染物的系统和方法
公开(公告)号：WO2013041545A1
公开(公告)日：2013-03-28
申请号：PCT/EP2012/068390
申请日：2012-09-19
申请人： SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. , SHELL OIL COMPANY
发明人： HAMRE, Hans Christian , VAN SANTEN, Helmar
IPC分类号： B01D53/14 , B01D53/18 , B04C3/04 , B04C5/26 , B04C5/30
CPC分类号： B01D53/1406 , B01D53/1456 , B01D53/18 , B04C5/26 , B04C5/30
摘要： The present invention provides a system (1) for removing contaminants from a contaminated gas stream (10) using a liquid absorbent, the system (1) at least comprising a first and a second separation unit (2A,2B), wherein the first separation unit (2A) comprises: • - a first separator (21A) having an inlet (22A) for a contaminated gas stream to be separated, a first outlet (23A) for separated gas and a second outlet (24A) for separated liquid absorbent; • - a rising conduit (20A) for transporting the contaminated gas stream to the inlet (22A) of the first separator (21A); • - a conduit (30A) for removing the separated gas at the first outlet (23A) of the first separator (21A); and • - a conduit (40A) for removing separated liquid absorbent at the second outlet (23A) of the first separator (21A); wherein the second separation unit (2B) comprises features corresponding to those of the first separation unit (2A).
摘要翻译：本发明提供了一种用于使用液体吸收剂从污染气流（10）除去污染物的系统（1），该系统（1）至少包括第一和第二分离单元（2A，2B），其中第一分离单元（2A）包括：。 - 第一分离器（21A），其具有用于待分离的污染气体流的入口（22A），用于分离气体的第一出口（23A）和用于分离的液体吸收剂的第二出口（24A）。 - 用于将污染的气体流输送到第一分离器（21A）的入口（22A）的上升管道（20A）; 。 - 用于去除第一分离器（21A）的第一出口（23A）处的分离气体的导管（30A）; 和。 - 用于在第一分离器（21A）的第二出口（23A）处去除分离的液体吸收剂的导管（40A）; 其中所述第二分离单元（2B）包括与所述第一分离单元（2A）相对应的特征。

3. 发明申请

WO2010079177A2 PROCESS AND APPARATUS FOR REMOVING GASEOUS CONTAMINANTS FROM GAS STREAM COMPRISING GASEOUS CONTAMINANTS 审中-公开
标题翻译：从包含气体污染物的气体流中除去气体污染物的工艺和装置
公开(公告)号：WO2010079177A2
公开(公告)日：2010-07-15
申请号：PCT/EP2010/050070
申请日：2010-01-06
申请人： SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. , VAN SANTEN, Helmar , SCHELLEKENS, Cornelius, Johannes
发明人： VAN SANTEN, Helmar , SCHELLEKENS, Cornelius, Johannes
IPC分类号： F25J3/06 , B01D53/00 , C10L3/10
CPC分类号： F25J3/061 , B01D53/002 , B01D53/1431 , B01D53/1462 , B01D53/261 , B01D53/263 , B01D53/265 , B01D53/75 , B01D2256/24 , B01D2257/304 , B01D2257/7022 , B01D2258/06 , C10L3/10 , C10L3/102 , F25J3/0625 , F25J3/0635 , F25J3/067 , F25J3/0675 , F25J2205/20 , F25J2210/70 , F25J2215/04 , F25J2220/64 , F25J2220/66 , F25J2240/02 , F25J2240/40 , F25J2240/60 , F25J2245/02 , F25J2270/12 , F25J2270/60 , F25J2270/66 , F25J2290/42 , Y02C10/12
摘要： The invention provides a process for removing gaseous contaminants from a feed gas stream which comprises methane and gaseous contaminants, in which process the feed gas stream is cooled to obtain a slurry which comprises solid contaminant, liquid phase contaminant and a methane enriched gaseous phase, the slurry so obtained is introduced into a cryogenic separation device in which from the top part the methane enriched gaseous phase is removed, the slurry is diluted with liquid phase contaminant and passed through a heat exchanger wherein solid contaminant is melted into liquid phase contaminant, at least part of the liquid phase contaminant so obtained is recycled to dilute the slurry inside the separation device, a stream comprising liquid phase contaminant is removed from the separation device at a position below the slurry level in the separation device by means of a pump, preferably an eductor and at least part of the removed liquid phase contaminant is recovered as a stream product and at least part is recycled to the eductor for use as a motive fluid in case an eductor is used and subsequently introduced into the separation device to dilute the slurry inside the separation device. The invention further concerns a device for carrying out the present process, the purified gas stream, and a process for liquefying a feed gas stream.
摘要翻译：本发明提供了一种从包含甲烷和气态污染物的进料气流中除去气态污染物的方法，在该方法中，将进料气流冷却以获得包含固体污染物，液相污染物和富甲烷气相的浆料，将如此获得的浆液引入低温分离装置中，其中从顶部部分除去富含甲烷的气相，浆液用液相污染物稀释并通过热交换器，其中固体污染物熔化成液相污染物，至少如此获得的液相污染物的一部分被再循环以稀释分离装置内的浆料，包含液相污染物的流在分离装置中低于浆料水平的位置处通过泵从分离装置移除，优选地为喷射器和至少部分去除的液相污染物作为流产物回收并且至少部分被再循环到喷射器以用作动力流体，以便在使用喷射器并随后引入分离装置中以稀释分离装置内的浆料。本发明还涉及用于实施本发明方法的装置，纯化气流以及用于液化进料气流的方法。

4. 发明申请

WO2010079175A2 PROCESS AND APPARATUS FOR SEPARATING A GASEOUS PRODUCT FROM A FEED STREAM COMPRISING CONTAMINANTS 审中-公开
标题翻译：从包含污染物的进料流分离气态产品的方法和装置
公开(公告)号：WO2010079175A2
公开(公告)日：2010-07-15
申请号：PCT/EP2010/050066
申请日：2010-01-06
申请人： SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. , VAN SANTEN, Helmar , SCHELLEKENS, Cornelius Johannes , VEENSTRA, Peter
发明人： VAN SANTEN, Helmar , SCHELLEKENS, Cornelius Johannes , VEENSTRA, Peter
IPC分类号： F25J3/06 , B04C5/04 , C10L3/10 , B01D53/00 , B01D53/24 , B01D45/12 , F25J3/02
CPC分类号： F25J3/061 , B01D45/12 , B01D53/002 , B01D2256/16 , B01D2256/20 , B01D2257/304 , B01D2257/504 , C10L3/10 , C10L3/102 , F25J3/0625 , F25J3/0635 , F25J3/067 , F25J3/0675 , F25J2205/20 , F25J2210/70 , F25J2215/04 , F25J2220/64 , F25J2220/66 , F25J2240/02 , F25J2240/40 , F25J2240/60 , F25J2245/02 , F25J2270/12 , F25J2270/60 , F25J2270/66 , F25J2290/42 , Y02C10/12 , Y02E60/324
摘要： The invention provides a process for separating at least part of a gaseous product from a feed stream which comprises contaminants, the process comprising: 1) providing the feed stream; 2) cooling the feed stream to a temperature at which a slurry stream is formed which comprises solid contaminant, liquid phase contaminant and the gaseous product; 3) introducing the slurry stream as obtained in step 2) via a plurality of tangentially directed inlet means, with a small inlet angle, into an upper part of a separation device, thereby creating a swirl of the slurry stream which allows at least part of the gaseous product to flow upwardly and solid contaminant and liquid phase contaminant to flow downwardly; 4) removing at least part of the gaseous product from the upper part of the device; and 5) removing a stream comprising liquid phase contaminant from a lower part of the device. The invention further relates to a cryogenic separation device for carrying out the process according to the present invention.
摘要翻译：本发明提供了一种从包含污染物的进料流中分离至少部分气态产物的方法，该方法包括：1）提供进料流; 2）将进料流冷却到形成浆料流的温度，其中包括固体污染物，液相污染物和气态产物; 3）将通过步骤2）中获得的浆料流通过多个具有小入口角度的切向入口装置引入分离装置的上部，由此产生浆料流的漩涡，其允许至少部分气态产物向上流动，固体污染物和液相污染物向下流动; 4）从装置的上部去除至少部分气体产物; 和5）从装置的下部去除包含液相污染物的物流。本发明还涉及一种用于实施本发明方法的低温分离装置。

5. 发明申请

WO2010023238A1 PROCESS AND APPARATUS FOR REMOVING GASEOUS CONTAMINANTS FROM GAS STREAM COMPRISING GASEOUS CONTAMINANTS 审中-公开
标题翻译：从包含气体污染物的气体流中除去气体污染物的工艺和装置
公开(公告)号：WO2010023238A1
公开(公告)日：2010-03-04
申请号：PCT/EP2009/061042
申请日：2009-08-27
申请人： SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. , GEERS, Henricus Abraham , VAN SANTEN, Helmar
发明人： GEERS, Henricus Abraham , VAN SANTEN, Helmar
IPC分类号： F25J3/06 , B01D21/24 , B01D53/00 , C10L3/10
CPC分类号： H01F5/04 , B01D53/002 , B01D2256/24 , C10L3/10 , C10L3/102 , C10L3/104 , F25J3/061 , F25J3/0635 , F25J3/067 , F25J2205/02 , F25J2205/20 , F25J2210/60 , F25J2215/04 , F25J2215/60 , F25J2215/80 , F25J2220/64 , F25J2220/66 , F25J2240/02 , F25J2240/40 , F25J2240/60 , F25J2245/02 , F25J2270/12 , F25J2270/60 , F25J2270/66 , F25J2290/42 , H01F27/2895 , H01R13/6633 , H01R13/6658 , H01R24/64
摘要： The invention provides a process and a device for removing gaseous contaminants from a feed gas stream which comprises methane and gaseous contaminants, in which process the feed gas stream is cooled to obtain a slurry which comprises solid contaminant, liquid phase contaminant and a methane enriched gaseous phase, the slurry so obtained is introduced into a cryogenic separation device (4) in which from the top the methane enriched gaseous phase is removed (5), the slurry is diluted with liquid phase contaminant (6) and introduced as suction fluid into an ejector (9) via which it is passed into a heat exchanger (10) arranged outside the separation device and wherein solid contaminant is melted into liquid phase contaminant, part of the liquid phase contaminant so obtained is recycled (6) to dilute the slurry of contaminants inside the separation device and part (13) is introduced into the bottom part of the separation device, liquid phase is withdrawn (14) from the bottom part of the separation device, and part of the withdrawn liquid phase contaminant is recovered as a stream product (16) and part is recycled (17) to the ejector for use a motive fluid.
摘要翻译：本发明提供一种用于从包含甲烷和气态污染物的进料气流中除去气态污染物的方法和装置，在该方法中，将进料气流冷却以获得包含固体污染物，液相污染物和富甲烷气体的浆料将如此获得的浆液引入低温分离装置（4），其中从顶部除去甲烷富集的气相（5），将浆液用液相污染物（6）稀释并作为抽吸流体引入喷射器（9）通过其被传送到布置在分离装置外部的热交换器（10）中，并且其中固体污染物被熔化成液相污染物，所得到的部分液相污染物被再循环（6）以稀释分离装置和部件（13）内的污染物被引入分离装置的底部，液相从罐底部排出（14）回收的液相污染物的一部分作为流产物（16）回收并且部分被再循环（17）到喷射器以使用运动流体。

6. 发明申请

WO2008000753A1 CYCLONIC LIQUID DEGASSING SEPARATOR AND METHOD FOR DEGASSING A FLUID MIXTURE 审中-公开
标题翻译：循环液体分解器和液体混合物的分解方法
公开(公告)号：WO2008000753A1
公开(公告)日：2008-01-03
申请号：PCT/EP2007/056392
申请日：2007-06-27
申请人： SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. , SHELL CANADA LIMITED , BETTING, Marco , PRAST, Bart , VAN SANTEN, Helmar , SCHELLEKENS, Cornelius Johannes , VERBEEK, Paulus Henricus Joannes , WILKINSON, Peter Mervyn
发明人： BETTING, Marco , PRAST, Bart , VAN SANTEN, Helmar , SCHELLEKENS, Cornelius Johannes , VERBEEK, Paulus Henricus Joannes , WILKINSON, Peter Mervyn
IPC分类号： B04C3/00 , B04C3/06 , B04C5/06 , B04C5/13 , B04C5/103 , B04C5/181 , B04C5/16 , B01D19/00
CPC分类号： B01D17/0217 , B04C3/00 , B04C3/06 , B04C5/06 , B04C5/103 , B04C5/13 , B04C5/16 , B04C5/181
摘要： A method and cyclonic separator are disclosed for degassing a fluid mixture comprising a carrier liquid and gaseous and/or vaporizable components, wherein: the fluid mixture is accelerated in a throat section (6, 21) of a vortex tube (1, 20) such that the static pressure of the fluid mixture is decreased and vaporizable components evaporate into a gaseous phase and the fluid mixture flows as a substantially homogeneously dispersed gas-liquid mixture through the throat section; the accelerated fluid mixture is induced to swirl within a tubular mid section of the vortex tube such that the fluid mixture is separated by centrifugal forces into a degassed liquid fraction and a gas enriched fraction; the degassed liquid fraction is induced to flow into a annular liquid outlet conduit (4, 21); and the gas enriched fraction is induced to flow into a central gas outlet conduit(3, 24). An advantage of inducing the fluid mixture to flow as a substantially homogeneously dispersed gas-liquid mixture through the throat section is that the velocity of sound in such a mixture is low, thereby increasing the Mach number and the pressure reduction in the throat section and enhancing evaporation of gas bubbles in the mixture.
摘要翻译：公开了一种方法和气旋分离器，其用于对包含载体液体和气体和/或可蒸发组分的流体混合物进行脱气，其中：流体混合物在涡流管（1,20）的喉部（6,21）中被加速，流体混合物的静压力降低，并且可蒸发组分蒸发成气相，并且流体混合物作为基本均匀分散的气液混合物流过喉部; 加速的流体混合物在涡流管的管状中间部分内引起涡流，使得流体混合物通过离心力分离成脱气的液体馏分和富含气体的馏分; 致动脱气的液体部分流入环形液体出口导管（4,21）中; 并且气体富集部分被诱导流入中心气体出口导管（3,44）。引起流体混合物作为基本上均匀分散的气液混合物通过喉部分流动的优点是这种混合物中的声速低，从而增加了喉部的马赫数和压力降低，并增强了混合物中气泡的蒸发。

7. 发明公开

EP2747874A1 SYSTEM AND METHOD FOR REMOVING CONTAMINANTS FROM A CONTAMINATED GAS STREAM 有权
标题翻译：系统和方法有灰尘微粒从污染的气体断电
公开(公告)号：EP2747874A1
公开(公告)日：2014-07-02
申请号：EP12759471.1
申请日：2012-09-19
申请人： Shell Internationale Research Maatschappij B.V.
发明人： HAMRE, Hans Christian , VAN SANTEN, Helmar
IPC分类号： B01D53/14 , B01D53/18 , B04C3/04 , B04C5/26 , B04C5/30
CPC分类号： B01D53/1406 , B01D53/1456 , B01D53/18 , B04C5/26 , B04C5/30
摘要： The present invention provides a system (1) for removing contaminants from a contaminated gas stream (10) using a liquid absorbent, the system (1) at least comprising a first and a second separation unit (2A,2B), wherein the first separation unit (2A) comprises: • - a first separator (21A) having an inlet (22A) for a contaminated gas stream to be separated, a first outlet (23A) for separated gas and a second outlet (24A) for separated liquid absorbent; • - a rising conduit (20A) for transporting the contaminated gas stream to the inlet (22A) of the first separator (21A); • - a conduit (30A) for removing the separated gas at the first outlet (23A) of the first separator (21A); and • - a conduit (40A) for removing separated liquid absorbent at the second outlet (23A) of the first separator (21A); wherein the second separation unit (2B) comprises features corresponding to those of the first separation unit (2A).

8. 发明公开

EP2032265A1 CYCLONIC LIQUID DEGASSING SEPARATOR AND METHOD FOR DEGASSING A FLUID MIXTURE 有权
标题翻译：旋风FLÜSSIGKEITSENTGASUNGSSEPARATOR和方法进行脱气处理的流体混合物
公开(公告)号：EP2032265A1
公开(公告)日：2009-03-11
申请号：EP07786854.5
申请日：2007-06-27
申请人： Shell Internationale Research Maatschappij B.V.
发明人： BETTING, Marco , PRAST, Bart , VAN SANTEN, Helmar , SCHELLEKENS, Cornelius Johannes , VERBEEK, Paulus Henricus Joannes , WILKINSON, Peter Mervyn
IPC分类号： B04C3/00 , B04C3/06 , B04C5/06 , B04C5/13 , B04C5/103 , B04C5/181 , B04C5/16 , B01D19/00
CPC分类号： B01D17/0217 , B04C3/00 , B04C3/06 , B04C5/06 , B04C5/103 , B04C5/13 , B04C5/16 , B04C5/181
摘要： A method and cyclonic separator are disclosed for degassing a fluid mixture comprising a carrier liquid and gaseous and/or vaporizable components, wherein: the fluid mixture is accelerated in a throat section (6, 21) of a vortex tube (1, 20) such that the static pressure of the fluid mixture is decreased and vaporizable components evaporate into a gaseous phase and the fluid mixture flows as a substantially homogeneously dispersed gas-liquid mixture through the throat section; the accelerated fluid mixture is induced to swirl within a tubular mid section of the vortex tube such that the fluid mixture is separated by centrifugal forces into a degassed liquid fraction and a gas enriched fraction; the degassed liquid fraction is induced to flow into a annular liquid outlet conduit (4, 21); and the gas enriched fraction is induced to flow into a central gas outlet conduit(3, 24). An advantage of inducing the fluid mixture to flow as a substantially homogeneously dispersed gas-liquid mixture through the throat section is that the velocity of sound in such a mixture is low, thereby increasing the Mach number and the pressure reduction in the throat section and enhancing evaporation of gas bubbles in the mixture.

9. 发明授权

EP2032265B1 CYCLONIC LIQUID DEGASSING SEPARATOR AND METHOD FOR DEGASSING A FLUID MIXTURE 有权
标题翻译：旋风FLÜSSIGKEITSENTGASUNGSSEPARATOR和方法进行脱气处理的流体混合物
公开(公告)号：EP2032265B1
公开(公告)日：2011-08-31
申请号：EP07786854.5
申请日：2007-06-27
申请人： Shell Internationale Research Maatschappij B.V.
发明人： BETTING, Marco , PRAST, Bart , VAN SANTEN, Helmar , SCHELLEKENS, Cornelius Johannes , VERBEEK, Paulus Henricus Joannes , WILKINSON, Peter Mervyn
IPC分类号： B04C3/00 , B04C3/06 , B04C5/06 , B04C5/13 , B04C5/103 , B04C5/181 , B04C5/16 , B01D19/00
CPC分类号： B01D17/0217 , B04C3/00 , B04C3/06 , B04C5/06 , B04C5/103 , B04C5/13 , B04C5/16 , B04C5/181
摘要： A method and cyclonic separator are disclosed for degassing a fluid mixture comprising a carrier liquid and gaseous and/or vaporizable components, wherein: the fluid mixture is accelerated in a throat section (6, 21) of a vortex tube (1, 20) such that the static pressure of the fluid mixture is decreased and vaporizable components evaporate into a gaseous phase and the fluid mixture flows as a substantially homogeneously dispersed gas-liquid mixture through the throat section; the accelerated fluid mixture is induced to swirl within a tubular mid section of the vortex tube such that the fluid mixture is separated by centrifugal forces into a degassed liquid fraction and a gas enriched fraction; the degassed liquid fraction is induced to flow into a annular liquid outlet conduit (4, 21); and the gas enriched fraction is induced to flow into a central gas outlet conduit(3, 24). An advantage of inducing the fluid mixture to flow as a substantially homogeneously dispersed gas-liquid mixture through the throat section is that the velocity of sound in such a mixture is low, thereby increasing the Mach number and the pressure reduction in the throat section and enhancing evaporation of gas bubbles in the mixture.

10. 发明公开

EP3384217A1 METHOD OF REMOVING CO2 FROM A CONTAMINATED HYDROCARBON STREAM 审中-公开
公开(公告)号：EP3384217A1
公开(公告)日：2018-10-10
申请号：EP16805787.5
申请日：2016-12-01
申请人： Shell Internationale Research Maatschappij B.V.
发明人： POORTE, Raimo Edwin Gregor , VAN AKEN, Michiel, Gijsbert , VAN CAMPEN, Laurens, Joseph, Arnold, Marie , VAN SANTEN, Helmar
IPC分类号： F25J3/06 , F25J1/00
CPC分类号： F25J3/0635 , B01D43/00 , B01D53/002 , B01D2256/245 , B01D2257/504 , F25J1/0022 , F25J1/0035 , F25J1/0037 , F25J1/004 , F25J1/0202 , F25J3/061 , F25J3/067 , F25J2205/10 , F25J2205/20 , F25J2205/84 , F25J2210/04 , F25J2215/04 , F25J2220/66 , F25J2230/30 , F25J2230/60 , F25J2235/60 , F25J2240/02 , F25J2245/02 , F25J2245/90 , F25J2270/04 , F25J2270/88 , Y02C10/12
摘要： The present invention provides a method to separate CO2 from a contaminated hydrocarbon-containing stream. The method comprises obtaining a multiphase contaminated hydrocarbon-containing stream (100) containing at least a vapour phase, a liquid phase and a solid phase, creating a slurry stream (120) from the multiphase stream. The slurry stream is fed to a crystallization chamber comprising CO2 seed particles. A liquid hydrocarbon stream (170) is obtained from the crystallization chamber (91) and a concentrated slurry (140) is obtained. The concentrated slurry (140) is removed from the crystallization chamber (91) by means of an extruder (142), thereby obtaining solid CO2. A feedback stream (141) is obtained from the solid CO2 comprising CO2 seed particles having an average size greater than 100 micron. The feedback stream (141) is passed into the crystallization chamber (91).

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