ZA9916B - Process for purifying air by adsorption before cryogenic distillation. - Google Patents

Process for purifying air by adsorption before cryogenic distillation.

Info

Publication number
ZA9916B
ZA9916B ZA9900016A ZA9916A ZA9916B ZA 9916 B ZA9916 B ZA 9916B ZA 9900016 A ZA9900016 A ZA 9900016A ZA 9916 A ZA9916 A ZA 9916A ZA 9916 B ZA9916 B ZA 9916B
Authority
ZA
South Africa
Prior art keywords
purifying air
cryogenic distillation
adsorption before
before cryogenic
adsorption
Prior art date
Application number
ZA9900016A
Other languages
English (en)
Inventor
Cyrille Millet
Philippe Bourgeois
Georges Kraus
Jean-Pierre Gabillard
Original Assignee
Air Liquide
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Air Liquide filed Critical Air Liquide
Publication of ZA9916B publication Critical patent/ZA9916B/xx

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/16Alumino-silicates
    • B01J20/18Synthetic zeolitic molecular sieves
    • B01J20/186Chemical treatments in view of modifying the properties of the sieve, e.g. increasing the stability or the activity, also decreasing the activity
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2253/00Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10Inorganic adsorbents
    • B01D2253/106Silica or silicates
    • B01D2253/108Zeolites
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2253/00Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10Inorganic adsorbents
    • B01D2253/106Silica or silicates
    • B01D2253/108Zeolites
    • B01D2253/1085Zeolites characterized by a silicon-aluminium ratio
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2256/00Main component in the product gas stream after treatment
    • B01D2256/10Nitrogen
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2256/00Main component in the product gas stream after treatment
    • B01D2256/12Oxygen
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/50Carbon oxides
    • B01D2257/504Carbon dioxide
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/70Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702Hydrocarbons
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/40Further details for adsorption processes and devices
    • B01D2259/416Further details for adsorption processes and devices involving cryogenic temperature treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0462Temperature swing adsorption
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/047Pressure swing adsorption
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02CCAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00Capture or disposal of greenhouse gases
    • Y02C20/40Capture or disposal of greenhouse gases of CO2
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S95/00Gas separation: processes
    • Y10S95/90Solid sorbent
    • Y10S95/902Molecular sieve

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Separation By Low-Temperature Treatments (AREA)
ZA9900016A 1998-01-14 1999-01-04 Process for purifying air by adsorption before cryogenic distillation. ZA9916B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9800303A FR2773499B1 (fr) 1998-01-14 1998-01-14 Procede de purification par adsorption de l'air avant distillation cryogenique

Publications (1)

Publication Number Publication Date
ZA9916B true ZA9916B (en) 1999-07-05

Family

ID=9521749

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA9900016A ZA9916B (en) 1998-01-14 1999-01-04 Process for purifying air by adsorption before cryogenic distillation.

Country Status (7)

Country Link
US (1) US6270557B1 (de)
EP (1) EP0930089B1 (de)
JP (1) JPH11253736A (de)
CN (1) CN1107529C (de)
DE (1) DE69902409T2 (de)
FR (1) FR2773499B1 (de)
ZA (1) ZA9916B (de)

Families Citing this family (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2775617B1 (fr) * 1998-03-09 2000-04-07 Ceca Sa Decarbonatation de flux gazeux au moyen d'adsorbants zeolitiques
FR2795657B1 (fr) * 1999-07-02 2001-09-14 Air Liquide Procede de purification d'air par adsorption sur zeolite echangee au baryum
DE19935383A1 (de) * 1999-07-29 2001-02-01 Linde Ag Verfahren und Vorrichtung zur Reinigung von Luft
JP4755328B2 (ja) * 1999-07-29 2011-08-24 リンデ アクチエンゲゼルシヤフト 空気浄化方法及び装置
FR2800995B1 (fr) * 1999-10-05 2002-01-04 Ceca Sa Adsorbants zeolitiques, leur procede d'obtention et leur utilisation pour la decarbonation de flux gazeux
FR2799390B1 (fr) * 1999-10-08 2002-06-07 Air Liquide Procede de traitement d'un gaz par adsorption a temperature modulee
US6391092B1 (en) 1999-10-12 2002-05-21 The Boc Group, Inc. Thermal swing adsorption process for the removal of dinitrogen oxide, hydrocarbons and other trace impurities from air
US6478854B1 (en) * 1999-11-25 2002-11-12 Tosoh Corporation High purity, low silica X-type zeolite binderless shaped product and gas separation method employing it
EP1142622B1 (de) * 2000-04-04 2006-06-21 Tosoh Corporation Verfahren zur adsorptiven Trennung von Kohlendioxid
FR2811241B1 (fr) * 2000-07-07 2002-12-13 Ceca Sa Procede pour la purification de melanges gazeux a base d'hydrogene utilisant une zeolite x au calcium
US6432171B1 (en) * 2000-08-28 2002-08-13 The Boc Group, Inc. Thermal swing adsorption process
US6409800B1 (en) * 2000-08-28 2002-06-25 The Boc Group, Inc. Temperature swing adsorption process
US6824590B2 (en) * 2000-11-07 2004-11-30 Air Products And Chemicals, Inc. Use of lithium-containing fau in air separation processes including water and/or carbon dioxide removal
EP1249264A1 (de) * 2001-04-11 2002-10-16 Ammonia Casale S.A. Verfahren zur Abscheidung und Zurückgewinnung von Kohldioxid aus Abgas oder Rauchgas von Brennstoffoxidation
JP3545377B2 (ja) * 2001-08-07 2004-07-21 日本酸素株式会社 空気液化分離用空気の精製装置および方法
FR2832077B1 (fr) * 2001-11-12 2004-08-27 Air Liquide Adsorbant zeolitique au baryum et calcium pour la purification de gaz, en particulier de l'air
FR2832141B1 (fr) * 2001-11-14 2004-10-01 Ceca Sa Procede de purification de gaz de synthese
US7300899B2 (en) * 2002-01-22 2007-11-27 Zeochem, Llc Lithium exchanged zeolite X adsorbent blends
US20050119112A1 (en) * 2002-01-22 2005-06-02 Zeochem, Llc Process for production of molecular sieve adsorbent blends
US6916359B2 (en) * 2002-04-25 2005-07-12 The Boc Group, Inc. Ozone production processes
FR2863909B1 (fr) * 2003-12-22 2006-05-26 Ceca Sa Methode de purification de flux gazeux pollue par co2 et hydrocarbure(s) et/ou oxyde(s) d'azote par adsorbant zeolitique agglomere
EP1736237A4 (de) 2004-03-30 2009-05-06 Taiyo Nippon Sanso Corp Vorbehandlung eines reinigungsmittels für eine luftverflüssigigungstrennvorrichtung und kohlenwasserstoffabsorptionsmittel zur verwendung darin sowie verfahren zur vorbehandlung von rohluft
DE102004034885A1 (de) * 2004-07-19 2006-02-16 Uhde Gmbh Silber-Gasdiffusionselektrode für den Einsatz in CO2-haltiger Luft
EA021006B1 (ru) 2009-04-20 2015-03-31 Эксонмобил Апстрим Рисерч Компани Способ удаления кислотных газов из потока углеводородного газа
US8680344B2 (en) 2011-01-25 2014-03-25 Zeochem Llc Molecular sieve adsorbent blends and uses thereof
JP5684898B2 (ja) * 2011-03-31 2015-03-18 大陽日酸株式会社 ガス精製方法
JP6068912B2 (ja) 2011-10-28 2017-01-25 日本碍子株式会社 Co2選択吸収部材を備えた金属−空気電池システム及びその運転方法
EP2628523A1 (de) 2012-02-14 2013-08-21 Air Liquide Medical G.m.b.H. Anlage zur Vor-Ort-Erzeugung von medizinischem Gas, und entsprechendes Steuerverfahren
EP2628521A1 (de) 2012-02-14 2013-08-21 Air Liquide Medical G.m.b.H. Anlage zur Vor-Ort-Erzeugung von medizinischem Gas, die über ein 3-Wege-Sicherheitsventil verbunden mit einer Ablassleitung verfügt
EP2628522A1 (de) 2012-02-14 2013-08-21 Air Liquide Medical G.m.b.H. Anlage mit mehreren in Reihe geschalteten Vorratsbehältern zur Vor-Ort-Erzeugung von medizinischem Gas, und Ablassleitung
EP2628524B1 (de) 2012-02-14 2019-05-29 Air Liquide Medical G.m.b.H. Vor Ort Produktionsanlage von medizinischem Gas
WO2013142100A1 (en) 2012-03-21 2013-09-26 Exxonmobil Upstream Research Company Separating carbon dioxide and ethane from a mixed stream
US9108145B2 (en) * 2013-05-16 2015-08-18 Air Products And Chemicals, Inc. Purification of air
CA2829060C (en) 2013-09-27 2015-02-03 Vitalaire Canada Inc. On-site medical gas production plant and associated operating method
CA2829065A1 (en) 2013-09-27 2015-03-27 Vitalaire Canada Inc. On-site medical gas production plant and associated operating method
MX363766B (es) 2013-12-06 2019-04-02 Exxonmobil Upstream Res Co Metodo y dispositivo para separar hidrocarburos y contaminantes con un mecanismo de calentamiento para desestabilizar y/o prevenir la adhesion de solidos.
US9823016B2 (en) 2013-12-06 2017-11-21 Exxonmobil Upstream Research Company Method and system of modifying a liquid level during start-up operations
US9874395B2 (en) 2013-12-06 2018-01-23 Exxonmobil Upstream Research Company Method and system for preventing accumulation of solids in a distillation tower
US9562719B2 (en) 2013-12-06 2017-02-07 Exxonmobil Upstream Research Company Method of removing solids by modifying a liquid level in a distillation tower
CA2925404C (en) 2013-12-06 2018-02-06 Exxonmobil Upstream Research Company Method and system of dehydrating a feed stream processed in a distillation tower
AU2014357665B2 (en) 2013-12-06 2017-06-22 Exxonmobil Upstream Research Company Method and device for separating a feed stream using radiation detectors
US10139158B2 (en) 2013-12-06 2018-11-27 Exxonmobil Upstream Research Company Method and system for separating a feed stream with a feed stream distribution mechanism
CA2931409C (en) 2013-12-06 2017-08-01 Exxonmobil Upstream Research Company Method and device for separating hydrocarbons and contaminants with a spray assembly
WO2015084495A2 (en) 2013-12-06 2015-06-11 Exxonmobil Upstream Research Company Method and system of maintaining a liquid level in a distillation tower
KR102255235B1 (ko) 2014-04-28 2021-05-21 삼성전자주식회사 알칼리금속 복염을 포함하는 이산화탄소 흡착제 및 그 제조 방법
CA2863543C (en) 2014-09-11 2015-11-03 Vitalaire Canada Inc. On-site medical gas production plant and associated operating method
WO2016137591A1 (en) 2015-02-27 2016-09-01 Exxonmobil Upstream Research Company Reducing refrigeration and dehydration load for a feed stream entering a cryogenic distillation process
AU2016323618B2 (en) 2015-09-18 2019-06-13 Exxonmobil Upsteam Research Company Heating component to reduce solidification in a cryogenic distillation system
US11255603B2 (en) 2015-09-24 2022-02-22 Exxonmobil Upstream Research Company Treatment plant for hydrocarbon gas having variable contaminant levels
US10323495B2 (en) 2016-03-30 2019-06-18 Exxonmobil Upstream Research Company Self-sourced reservoir fluid for enhanced oil recovery
CN105858611B (zh) * 2016-03-31 2018-07-10 四川天采科技有限责任公司 一种制纯氧的全温程变压吸附方法
US11306267B2 (en) 2018-06-29 2022-04-19 Exxonmobil Upstream Research Company Hybrid tray for introducing a low CO2 feed stream into a distillation tower
WO2020005553A1 (en) 2018-06-29 2020-01-02 Exxonmobil Upstream Research Company (Emhc-N1.4A.607) Mixing and heat integration of melt tray liquids in a cryogenic distillation tower
CN113828274B (zh) * 2021-10-08 2023-12-08 中国地质科学院郑州矿产综合利用研究所 一种低压下吸附二氧化碳的BaSrNaLSX制备方法

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3078639A (en) * 1960-01-06 1963-02-26 Union Carbide Corp Carbon dioxide removal from vapor mixtures
US3078644A (en) * 1960-01-19 1963-02-26 Union Carbide Corp Method for adsorbing and separating unsaturated aliphatic hydrocarbons
CH623748A5 (en) * 1975-12-15 1981-06-30 Sergei Zinovievich Vasiliev Process for purifying gas mixtures
GB1589213A (en) * 1977-09-23 1981-05-07 Uop Inc Method of manufacturing a zeolitic adsorbent
US4249915A (en) * 1979-05-30 1981-02-10 Air Products And Chemicals, Inc. Removal of water and carbon dioxide from air
DE3143993A1 (de) * 1981-11-05 1983-05-11 Bayer Ag, 5090 Leverkusen Molekularsieb-zeolith fuer die gewinnung von wasserstoff mit der druckwechsel-adsorptions-technik
DE3702190A1 (de) * 1987-01-26 1988-08-04 Linde Ag Adsorptionsverfahren
US4775396A (en) * 1987-11-05 1988-10-04 Union Carbide Corporation Selective adsorption of CO2 on zeolites
US4935580A (en) * 1988-06-14 1990-06-19 Uop Process for purification of hydrocarbons using metal exchanged clinoptilolite to remove carbon dioxide
US5156657A (en) * 1990-03-29 1992-10-20 The Boc Group, Inc. Process for pre-purification of air for separation
US5551257A (en) * 1992-10-01 1996-09-03 The Boc Group, Inc. Production of ultrahigh purity nitrogen
US5258058A (en) * 1992-10-05 1993-11-02 Air Products And Chemicals, Inc. Nitrogen adsorption with a divalent cation exchanged lithium X-zeolite
IL112027A (en) * 1994-02-14 1999-03-12 Boc Group Inc A method for separating nitrogen from other gases
US5454857A (en) * 1994-03-18 1995-10-03 Uop Air separation process
US5531808A (en) * 1994-12-23 1996-07-02 The Boc Group, Inc. Removal of carbon dioxide from gas streams
US5587003A (en) * 1995-03-21 1996-12-24 The Boc Group, Inc. Removal of carbon dioxide from gas streams
US5560763A (en) * 1995-05-24 1996-10-01 The Boc Group, Inc. Integrated air separation process
US5938819A (en) * 1997-06-25 1999-08-17 Gas Separation Technology Llc Bulk separation of carbon dioxide from methane using natural clinoptilolite
US5855650A (en) * 1997-09-09 1999-01-05 Air Products And Chemicals, Inc. Purification of gases using solid adsorbents
US5980611A (en) * 1997-09-25 1999-11-09 The Boc Group, Inc. Air purification process
US5906675A (en) * 1997-09-30 1999-05-25 The Boc Group, Inc. Air purification process

Also Published As

Publication number Publication date
JPH11253736A (ja) 1999-09-21
DE69902409T2 (de) 2003-05-22
CN1229907A (zh) 1999-09-29
EP0930089B1 (de) 2002-08-07
US6270557B1 (en) 2001-08-07
DE69902409D1 (de) 2002-09-12
FR2773499B1 (fr) 2000-02-11
EP0930089A1 (de) 1999-07-21
CN1107529C (zh) 2003-05-07
FR2773499A1 (fr) 1999-07-16

Similar Documents

Publication Publication Date Title
ZA9916B (en) Process for purifying air by adsorption before cryogenic distillation.
ZA968321B (en) Adsorbents for ozone recovery from gas mixtures.
AU5389999A (en) Apparatus for providing benefits to respiratory gases
SG65098A1 (en) Getter system for purifying the work atmosphere in the processes of physical vapor deposition
IL144985A0 (en) Agglomerated zeolitic adsorbents, method for obtaining same and uses thereof
ZA991844B (en) Decarbonation of gas flows using zeolite adsorbents.
GC0000299A (en) Process for purifying carbon dioxide-containing gas streams
ZA9811117B (en) Process for producing saw strips.
HUP0103325A3 (en) Method for chromatographically purifying insulins
ZA966081B (en) Adsorption process.
DE59200748D1 (de) Sorptionskolonne zur Abgasreinigung.
ZA978880B (en) Process for purifying hydroxide compounds.
ZA9811527B (en) Process for gas separation by adsorption with variable production rate
ZA200105820B (en) Method for stopping purifying column.
AU2001274137A1 (en) Method for purifying lactams
SG65043A1 (en) Process for purifying crude 1,4-butanediol
AU2860001A (en) Method for purifying lactames
GB9821970D0 (en) Process for purifying a process system
AUPP806999A0 (en) Process for purifying immunoglobulins
EP0682118A3 (de) Verfahren zum Reinigen cyclischer Inulooligosaccharide.
GB2335263B (en) Process and plant for separating air by cryogenic distillation
ZA976025B (en) Process for the adsorptive separation of air.
GB9810387D0 (en) Process for adsorbing gas
EP0678498A3 (de) Verfahren zur Reinigung von Ethylenglykolcarbonat (EGC) durch Adsorption an Aktivkohle.
EP1142864A4 (de) Verfahren zur herstellung von l-erythro-(1r,2s)-2-amino-1-phenylpropan-1-ol