JP6514885B2 - 顆粒 - Google Patents
顆粒 Download PDFInfo
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- JP6514885B2 JP6514885B2 JP2014250840A JP2014250840A JP6514885B2 JP 6514885 B2 JP6514885 B2 JP 6514885B2 JP 2014250840 A JP2014250840 A JP 2014250840A JP 2014250840 A JP2014250840 A JP 2014250840A JP 6514885 B2 JP6514885 B2 JP 6514885B2
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- JP
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- Prior art keywords
- granulation
- particles
- granulator
- granules
- approximately
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000008187 granular material Substances 0.000 title claims description 63
- 239000004202 carbamide Substances 0.000 claims description 41
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea group Chemical group NC(=O)N XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 41
- 239000002245 particle Substances 0.000 description 142
- 238000005469 granulation Methods 0.000 description 82
- 230000003179 granulation Effects 0.000 description 82
- 238000000034 method Methods 0.000 description 66
- 230000008569 process Effects 0.000 description 59
- 239000007789 gas Substances 0.000 description 32
- 239000000428 dust Substances 0.000 description 28
- 239000000047 product Substances 0.000 description 28
- 238000009826 distribution Methods 0.000 description 23
- 239000007788 liquid Substances 0.000 description 20
- 239000000203 mixture Substances 0.000 description 20
- 239000003570 air Substances 0.000 description 18
- 239000007787 solid Substances 0.000 description 18
- 238000003860 storage Methods 0.000 description 14
- 239000012530 fluid Substances 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 8
- 239000011148 porous material Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- 238000005549 size reduction Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 5
- 239000003337 fertilizer Substances 0.000 description 5
- 238000004513 sizing Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000012216 screening Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004254 Ammonium phosphate Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 229910000148 ammonium phosphate Inorganic materials 0.000 description 2
- 235000019289 ammonium phosphates Nutrition 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 2
- 235000011130 ammonium sulphate Nutrition 0.000 description 2
- NGLMYMJASOJOJY-UHFFFAOYSA-O azanium;calcium;nitrate Chemical compound [NH4+].[Ca].[O-][N+]([O-])=O NGLMYMJASOJOJY-UHFFFAOYSA-O 0.000 description 2
- INIZPXBLAMXMBJ-UHFFFAOYSA-O azanium;magnesium;nitrate Chemical compound [NH4+].[Mg].[O-][N+]([O-])=O INIZPXBLAMXMBJ-UHFFFAOYSA-O 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000112 cooling gas Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 2
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000005201 scrubbing Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229930185605 Bisphenol Natural products 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229940095686 granule product Drugs 0.000 description 1
- 239000006166 lysate Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 235000020030 perry Nutrition 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/006—Coating of the granules without description of the process or the device by which the granules are obtained
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/16—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fertilizers (AREA)
- Glanulating (AREA)
- Medicinal Preparation (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Description
‐ 粒子を備えた造粒領域を提供するステップ(粒子は動かされ続けている)と、
‐ 液状組成物を備えた第一の供給流を造粒領域内に提供するステップ(液状組成物は、造粒領域内を動いている粒子の上又は上方に適用される)と、
‐ 顆粒を備えた生成物流を造粒領域から回収するステップ(顆粒は、造粒領域内を動いている粒子の層状成長の結果である)とを備える。
‐ 動かされ続けている粒子を備えた造粒領域を提供するステップと、
‐ 造粒領域内を動いている粒子の上又は上方に適用される液状組成物を備えた第一の供給流を造粒領域内に提供するステップと、
‐ 造粒領域内を動いている粒子の層状成長の結果である顆粒を備えた生成物流を造粒領域から回収するステップとを備え、
造粒核を備えた第二の供給流が造粒領域内に供給され、造粒核が平均粒径の15%未満である粒径の標準偏差を有する粒径分布を有し、第二の供給流が生成物流の0.05質量%から50質量%を構成することを特徴とする方法によって達成される。
μは、平均粒径、
Wtotは、粒子の全質量、
Wiは、i番目の分画の粒子の質量、
xiは、(pi−1+pi)/2に等しいi番目の分画の平均粒径、
n+1は、分画の総数である。
試験設定においては、尿素を、流動層造粒機内において略110℃の温度で、直径45cmのシリンダー状流動層で造粒した。流動層の下側は、その6%が直径1.8mmの孔で構成された多孔質プレートによって、境界付けられていた。冷却空気は、略2m/sの表面速度で孔を通って流動層に流れ込んでいた。オーバーフローが、底部プレート上方70cmの層の上側に提供された。特許文献2に記載されるような液体分配デバイスを、底部プレートの中央に配置した。
硝酸アンモニウムを、噴流層造粒機の試験設定で造粒した。噴流層を、直径45cmのシリンダー状容器内に配置し、その容器の下側には、垂直線に対して30度の角度で下方に収束していて、空気供給パイプで終端されている円錐セクションが設けられていた。略35℃の空気が、略400kg/hの割合、及び略40m/sの速度で装置に入った。噴流層内の顆粒は略100℃の温度を有していた。オーバーフローは、円錐セクションからシリンダー状セクションの移行部上方30cmの噴流層のシリンダー状セクションに配置された。
比較例Aに係る試験設定で、流動層造粒機において、略110℃の温度で尿素を造粒した。冷却空気が、略2m/sの表面速度で孔を通って流動層内に流れ込んだ。オーバーフローを、底部プレートの上方70cmで層の上側に提供した。略90kg/hの割合で供給される空気で液体分配デバイスを略140℃で作動させながら、略1.5質量%の水を含有する略140℃の尿素溶解物を、尿素貯蔵容器から流動層造粒機に略190kg/hの割合で供給した。1mmから1.4mmの間の粒径を有する固体尿素の錠剤(生成されたままのものであり、μ=1.2mm、σ=(1.4−1)/6=0.067mm、σ/μ=0.056(5.6%))を備えた第二の供給流を、10kg/hの割合で流動層造粒機に加えた。層から出て行く尿素顆粒を、冷却器において冷却ガスを用いて略40℃に冷却して、その後、平台スクリーンでスクリーニングした。
比較例Aに係る試験設定で、流動層造粒機において、略110℃の温度で尿素を造粒した。冷却空気が、略2m/sの表面速度で孔を通って流動層内に流れ込んだ。オーバーフローを、底部プレートの上方70cmで層の上側に提供した。略90kg/hの割合で供給される空気で液体分配デバイスを略140℃で作動させながら、略1.5質量%の水を含有する略140℃の尿素溶解物を、尿素貯蔵容器から流動層造粒機に略190kg/hの割合で供給した。略1.7mmから2.2mmの間の粒径を有する固体尿素の錠剤(生成されたままのものであり、μ=1.95mm、σ=(2.2−1.7)/6=0.083mm、σ/μ=0.043(4.3%))を備えた第二の供給流を、50kg/hの割合で流動層造粒機に加えた。層から出て行く尿素顆粒を、冷却器において、冷却ガスを用いて略40℃に冷却し、その後、平台スクリーンでスクリーニングした。
2 ライン
3 ガス流
4 造粒機
5 ライン
6 ライン
7 ガス/固体分離装置
8 ライン
9 ライン
21 ライン
25 第二の供給流
26 貯蔵容器
Claims (1)
- コア及びシェルを備えた顆粒であって、前記コアが第一の成分を備え、前記シェルが、該顆粒のコアの周囲に第二の成分の層状構造を備え、前記第一の成分及び前記第二の成分が尿素を備え、前記顆粒の密度が1330kg/m3未満であり、前記顆粒の前記コアの密度が前記顆粒の前記シェルの密度よりも低く、前記コアが半球形状を有する、顆粒。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09169913A EP2305371A1 (en) | 2009-09-10 | 2009-09-10 | Process for producing granules |
EP09169913.2 | 2009-09-10 |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2012528294A Division JP2013504410A (ja) | 2009-09-10 | 2010-08-10 | 顆粒を生成する方法 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2017153993A Division JP6517889B2 (ja) | 2009-09-10 | 2017-08-09 | 顆粒を生成する方法 |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2015062904A JP2015062904A (ja) | 2015-04-09 |
JP2015062904A5 JP2015062904A5 (ja) | 2018-12-13 |
JP6514885B2 true JP6514885B2 (ja) | 2019-05-15 |
Family
ID=41217563
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2012528294A Pending JP2013504410A (ja) | 2009-09-10 | 2010-08-10 | 顆粒を生成する方法 |
JP2014250840A Active JP6514885B2 (ja) | 2009-09-10 | 2014-12-11 | 顆粒 |
JP2017153993A Active JP6517889B2 (ja) | 2009-09-10 | 2017-08-09 | 顆粒を生成する方法 |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2012528294A Pending JP2013504410A (ja) | 2009-09-10 | 2010-08-10 | 顆粒を生成する方法 |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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JP2017153993A Active JP6517889B2 (ja) | 2009-09-10 | 2017-08-09 | 顆粒を生成する方法 |
Country Status (11)
Country | Link |
---|---|
US (1) | US8835005B2 (ja) |
EP (2) | EP2305371A1 (ja) |
JP (3) | JP2013504410A (ja) |
CN (1) | CN102596383B (ja) |
AR (1) | AR078348A1 (ja) |
BR (1) | BR112012005418B1 (ja) |
CA (1) | CA2773498C (ja) |
EA (1) | EA025143B1 (ja) |
HR (1) | HRP20191749T1 (ja) |
PL (1) | PL2475455T3 (ja) |
WO (1) | WO2011029682A1 (ja) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2489429A1 (en) | 2011-02-21 | 2012-08-22 | Urea Casale S.A. | Fluid bed granulation of urea and related apparatus |
EP2497567A1 (en) * | 2011-03-10 | 2012-09-12 | Urea Casale S.A. | Process and apparatus for production of a granular urea product |
US9856381B2 (en) | 2013-08-22 | 2018-01-02 | Empire Technology Development Llc | Structured endothermic fire-retardant agents |
DE102015108344A1 (de) | 2015-05-27 | 2016-12-01 | Thyssenkrupp Ag | Granulation von Ammoniumsulfat |
US9878467B2 (en) * | 2015-06-19 | 2018-01-30 | The Procter & Gamble Company | Apparatus and process for forming particles |
CN105139897B (zh) * | 2015-07-23 | 2017-08-11 | 清华大学 | 一种大规模连续制备包覆颗粒的*** |
DE102016220648A1 (de) | 2016-10-20 | 2018-04-26 | Thyssenkrupp Ag | Ammoniumsulfat enthaltendes Granulat |
DE102017201182A1 (de) | 2017-01-25 | 2018-07-26 | Thyssenkrupp Ag | Verfahren und Anlage zur Wärmerückgewinnung bei der Fließbettgranulation |
DE102017207035A1 (de) | 2017-04-26 | 2018-10-31 | Thyssenkrupp Ag | Verfahren und Vorrichtung zur Herstellung eines Granulats |
EP3398676A1 (en) * | 2017-05-05 | 2018-11-07 | Casale Sa | Production of a solid chemical product |
EP3593898B1 (en) | 2018-07-13 | 2021-09-01 | thyssenkrupp Fertilizer Technology GmbH | Producing fertilizer granules with a defined size distribution |
JP7355690B2 (ja) * | 2020-03-30 | 2023-10-03 | 太平洋マテリアル株式会社 | 尿素を含むモルタルまたはコンクリート組成物 |
Family Cites Families (19)
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US3903333A (en) * | 1973-03-30 | 1975-09-02 | Tennessee Valley Authority | Production of slow release nitrogen fertilizers by improved method of coating urea with sulfur |
GB1581761A (en) * | 1977-06-09 | 1980-12-17 | Azote Sa Cie Neerlandaise | Urea granulation |
CA1101641A (en) | 1977-06-09 | 1981-05-26 | Anton Niks | Urea granulation |
JPS6034517B2 (ja) * | 1978-03-03 | 1985-08-09 | 宇部興産株式会社 | 流動層で尿素を造粒する方法 |
NL8302999A (nl) * | 1983-08-27 | 1985-03-18 | Unie Van Kunstmestfab Bv | Werkwijze voor het bereiden van granules. |
NL8303000A (nl) * | 1983-08-27 | 1985-03-18 | Unie Van Kunstmestfab Bv | Werkwijze voor het bereiden van granules. |
JPS61216725A (ja) * | 1985-03-20 | 1986-09-26 | Mitsui Toatsu Chem Inc | 尿素の造粒方法 |
DE69303284T2 (de) * | 1992-08-07 | 1997-02-06 | Hydro Agri Sluiskil B.V., Sluiskil | Verfahren zur herstellung von harnstoffgranulaten |
JPH07222920A (ja) | 1994-02-16 | 1995-08-22 | Japan Synthetic Rubber Co Ltd | 基材粒子の被覆方法 |
NL1002862C2 (nl) | 1996-04-15 | 1997-10-17 | Dsm Nv | Werkwijze voor het bereiden van granules. |
NZ331531A (en) * | 1997-09-04 | 2000-01-28 | Toyo Engineering Corp | method for granulation and granulator |
ES2355123T3 (es) * | 1998-11-13 | 2011-03-23 | Danisco Us Inc. | Gránulo de baja densidad en lecho fluidizado. |
CA2440902C (en) * | 2001-03-21 | 2009-11-03 | Urea Casale S.A. | Fluid bed granulation process |
US6716015B2 (en) | 2001-11-26 | 2004-04-06 | Enersul, Inc. | Distribution system for a pastillation machine |
JP2006193345A (ja) * | 2005-01-11 | 2006-07-27 | Tosoh Corp | セラミックス微小球およびその製造方法 |
AU2006237137B8 (en) | 2005-04-18 | 2011-12-22 | Stamicarbon B.V. | Process for the production of urea-comprising particles |
JP4852270B2 (ja) * | 2005-07-13 | 2012-01-11 | 東洋エンジニアリング株式会社 | 顆粒尿素製品の製造方法 |
DE102005037750A1 (de) * | 2005-08-10 | 2007-02-22 | Glatt Ingenieurtechnik Gmbh | Verfahren zur Herstellung von Harnstoffpellets |
EP2077147A1 (en) | 2008-01-04 | 2009-07-08 | Urea Casale S.A. | Fluid bed granulation process and apparatus |
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2009
- 2009-09-10 EP EP09169913A patent/EP2305371A1/en not_active Withdrawn
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2010
- 2010-08-10 CN CN201080046735.8A patent/CN102596383B/zh active Active
- 2010-08-10 PL PL10742817T patent/PL2475455T3/pl unknown
- 2010-08-10 EA EA201270402A patent/EA025143B1/ru not_active IP Right Cessation
- 2010-08-10 US US13/394,800 patent/US8835005B2/en active Active
- 2010-08-10 WO PCT/EP2010/061620 patent/WO2011029682A1/en active Application Filing
- 2010-08-10 JP JP2012528294A patent/JP2013504410A/ja active Pending
- 2010-08-10 CA CA2773498A patent/CA2773498C/en active Active
- 2010-08-10 EP EP10742817.9A patent/EP2475455B1/en not_active Revoked
- 2010-08-10 BR BR112012005418-0A patent/BR112012005418B1/pt active IP Right Grant
- 2010-09-08 AR ARP100103296A patent/AR078348A1/es active IP Right Grant
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2014
- 2014-12-11 JP JP2014250840A patent/JP6514885B2/ja active Active
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2017
- 2017-08-09 JP JP2017153993A patent/JP6517889B2/ja active Active
-
2019
- 2019-09-26 HR HRP20191749TT patent/HRP20191749T1/hr unknown
Also Published As
Publication number | Publication date |
---|---|
CA2773498C (en) | 2016-05-17 |
EA025143B1 (ru) | 2016-11-30 |
JP2015062904A (ja) | 2015-04-09 |
PL2475455T3 (pl) | 2020-03-31 |
CN102596383B (zh) | 2015-09-09 |
CN102596383A (zh) | 2012-07-18 |
WO2011029682A1 (en) | 2011-03-17 |
AR078348A1 (es) | 2011-11-02 |
BR112012005418B1 (pt) | 2019-01-22 |
US20120231277A1 (en) | 2012-09-13 |
EP2475455A1 (en) | 2012-07-18 |
HRP20191749T1 (hr) | 2019-12-27 |
EP2305371A1 (en) | 2011-04-06 |
JP2013504410A (ja) | 2013-02-07 |
BR112012005418A2 (pt) | 2016-04-12 |
JP2017200695A (ja) | 2017-11-09 |
JP6517889B2 (ja) | 2019-05-22 |
EA201270402A1 (ru) | 2012-09-28 |
US8835005B2 (en) | 2014-09-16 |
EP2475455B1 (en) | 2019-09-11 |
CA2773498A1 (en) | 2011-03-17 |
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