BR112022024331A2 - Produção limitante de ácido acético no processo de odh de etano - Google Patents

Produção limitante de ácido acético no processo de odh de etano

Info

Publication number
BR112022024331A2
BR112022024331A2 BR112022024331A BR112022024331A BR112022024331A2 BR 112022024331 A2 BR112022024331 A2 BR 112022024331A2 BR 112022024331 A BR112022024331 A BR 112022024331A BR 112022024331 A BR112022024331 A BR 112022024331A BR 112022024331 A2 BR112022024331 A2 BR 112022024331A2
Authority
BR
Brazil
Prior art keywords
acetic acid
ethane
ethylene
oxidative dehydrogenation
limiting
Prior art date
Application number
BR112022024331A
Other languages
English (en)
Inventor
Olayiwola Bolaji
GOODARZNIA Shahin
Simanzhenkov Vasily
Aiffa Mohamed
SERHAL Kamal
Ladd Robert
Gent David
Original Assignee
Nova Chem Int Sa
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 Nova Chem Int Sa filed Critical Nova Chem Int Sa
Publication of BR112022024331A2 publication Critical patent/BR112022024331A2/pt

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/15—Preparation of carboxylic acids or their salts, halides or anhydrides by reaction of organic compounds with carbon dioxide, e.g. Kolbe-Schmitt synthesis
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C11/00—Aliphatic unsaturated hydrocarbons
    • C07C11/02—Alkenes
    • C07C11/04—Ethene
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
    • C07C5/42—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with a hydrogen acceptor
    • C07C5/48—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with a hydrogen acceptor with oxygen as an acceptor
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C53/00—Saturated compounds having only one carboxyl group bound to an acyclic carbon atom or hydrogen
    • C07C53/08—Acetic acid
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2523/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00
    • C07C2523/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • C07C2523/20—Vanadium, niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2523/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00
    • C07C2523/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • C07C2523/20—Vanadium, niobium or tantalum
    • C07C2523/22—Vanadium
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2523/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00
    • C07C2523/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • C07C2523/24—Chromium, molybdenum or tungsten
    • C07C2523/28—Molybdenum
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2527/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • C07C2527/02—Sulfur, selenium or tellurium; Compounds thereof
    • C07C2527/057—Selenium or tellurium; Compounds thereof
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Abstract

PRODUÇÃO LIMITANTE DE ÁCIDO ACÉTICO NO PROCESSO DE ODH DE ETANO. A presente revelação se refere a limitar a produção de ácido acético em um processo de desidrogenação oxidativa para converter etano em etileno. O processo de desidrogenação oxidativa inclui alimentar ácido acético, juntamente com etano e oxigênio em um reator de desidrogenação oxidativa em que o contato com um catalisador leva à conversão do etano em etileno e ácido acético. Ao incluir ácido acético na alimentação, a quantidade de ácido acético produzida pode ser limitada e a razão de etileno produzido para etano consumido pode aumentar.
BR112022024331A 2020-06-09 2021-05-25 Produção limitante de ácido acético no processo de odh de etano BR112022024331A2 (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202063036471P 2020-06-09 2020-06-09
PCT/IB2021/054554 WO2021250495A1 (en) 2020-06-09 2021-05-25 Limiting acetic acid production in ethane odh process

Publications (1)

Publication Number Publication Date
BR112022024331A2 true BR112022024331A2 (pt) 2022-12-27

Family

ID=76197517

Family Applications (1)

Application Number Title Priority Date Filing Date
BR112022024331A BR112022024331A2 (pt) 2020-06-09 2021-05-25 Produção limitante de ácido acético no processo de odh de etano

Country Status (9)

Country Link
US (1) US12325684B2 (pt)
EP (1) EP4161897A1 (pt)
JP (1) JP7684332B2 (pt)
KR (1) KR102908238B1 (pt)
CN (1) CN115667203A (pt)
BR (1) BR112022024331A2 (pt)
CA (1) CA3181387A1 (pt)
MX (1) MX2022014701A (pt)
WO (1) WO2021250495A1 (pt)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3181387A1 (en) 2020-06-09 2021-12-16 Nova Chemicals Corporation Limiting acetic acid production in ethane odh process
WO2025068905A1 (en) * 2023-09-26 2025-04-03 Nova Chemicals (International) S.A. Systems and methods to alter ethylene or acetic acid selectivity using reactor space velocity
WO2026069107A1 (en) * 2024-09-25 2026-04-02 Nova Chemicals (International) S.A. Systems and methods to alter ethylene or acetic acid selectivity using reactor space velocity

Family Cites Families (76)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6909851A (pt) 1968-07-05 1970-01-07
US3509115A (en) 1968-12-11 1970-04-28 Nat Distillers Chem Corp Process of preparing ethylene-vinyl acetate copolymers
US3715389A (en) 1971-03-01 1973-02-06 Halcon International Inc Process for preparing glycol esters from olefinically unsaturated compounds
PL111486B1 (en) 1977-08-11 1980-08-30 Os Bad Rozwojowy Syst Mech Protection system for power network with insulated neutral
US4899003A (en) 1985-07-11 1990-02-06 Union Carbide Chemicals And Plastics Company Inc. Process for oxydehydrogenation of ethane to ethylene
JPH0625080B2 (ja) * 1986-10-08 1994-04-06 ユニオン、カ−バイド、コ−ポレ−シヨン エタンのエチレンへのオキシ脱水素化方法
US5162578A (en) 1987-06-12 1992-11-10 Union Carbide Chemicals & Plastics Technology Corporation Acetic acid from ethane, ethylene and oxygen
CA2035426A1 (en) 1990-02-09 1991-08-10 David W. Smith Catalytic carbonylation process
GB9314514D0 (en) 1993-07-13 1993-08-25 Ici Plc Hydrocarbon processing
US7189377B1 (en) 1996-08-07 2007-03-13 Bp Chemicals Limited Apparatus for performing integrated process for reproduction of vinyl acetate and/or acetic acid using a fluidized bed
DE19717075A1 (de) 1997-04-23 1998-10-29 Hoechst Ag Verfahren zur Herstellung von Essigsäure in einer Reaktorkaskade
DE19745902A1 (de) * 1997-10-17 1999-04-22 Hoechst Ag Verfahren zur selektiven Herstellung von Essigsäure durch katalytische Oxidation von Ethan
GB9807142D0 (en) 1998-04-02 1998-06-03 Bp Chem Int Ltd Catalyst and process utilising the catalyst
GB9819221D0 (en) 1998-09-04 1998-10-28 Bp Chem Int Ltd Process for the production of acetic acid
US6417422B1 (en) 1999-02-22 2002-07-09 Symyx Technologies, Inc. Ni catalysts and methods for alkane dehydrogenation
US6573409B1 (en) 1999-07-02 2003-06-03 The Nutrasweet Company Process for the preparation of 3,3-dimethylbutanal
DE60029642T2 (de) 2000-05-19 2007-02-22 Celanese International Corp., Dallas Verfahren zur herstellung von vinylacetat
US6403523B1 (en) 2000-09-18 2002-06-11 Union Carbide Chemicals & Plastics Technology Corporation Catalysts for the oxidative dehydrogenation of hydrocarbons
GB0026243D0 (en) 2000-10-26 2000-12-13 Bp Chem Int Ltd Process
JP2003071299A (ja) 2001-06-19 2003-03-11 Showa Denko Kk 低級脂肪族カルボン酸エステル製造用触媒の再生方法、該再生方法による低級脂肪族カルボン酸エステル製造用触媒の製造方法、該再生方法により再生した低級脂肪族カルボン酸エステル製造用触媒及び該触媒を用いた低級脂肪族カルボン酸エステルの製造方法
GB0200021D0 (en) 2002-01-02 2002-02-13 Bp Chem Int Ltd Process
GB0205014D0 (en) 2002-03-04 2002-04-17 Bp Chem Int Ltd Process
GB0205016D0 (en) 2002-03-04 2002-04-17 Bp Chem Int Ltd Process
GB0312965D0 (en) 2003-06-05 2003-07-09 Bp Chem Int Ltd Process
DE10359815A1 (de) 2003-12-19 2005-07-28 Clariant Gmbh Verfahren zur Herstellung von Dialkylphosphinsäure-Salzen
BRPI0500615B1 (pt) 2004-03-10 2015-07-14 Rohm And Haas Company Catalisador modificado, e, sistema de catalisador modificado
BRPI0500616A (pt) 2004-03-10 2007-07-10 Rohm & Haas processos para aperfeiçoar uma ou mais caracterìsticas de desempenho de um ou mais catalisadores de óxido metálico, e para produzir ácidos carboxìlicos insaturados
BRPI0500609A (pt) 2004-03-10 2007-07-10 Rohm & Haas processos para preparar um ou mais catalisadores modificados, e, para a criotrituração de um ou mais catalisadores de óxido metálico
US20080221374A1 (en) 2005-01-05 2008-09-11 Basf Aktiengesellschaft Method for the Production of Propene from Propane
BRPI0611208A2 (pt) * 2005-06-01 2010-08-24 Celanese Int Corp processo para preparar etileno a partir de alimentaÇço gasosa que compreende etano e oxigÊnio e processo para oxidar etano para produzir etileno e Ácido acÉtico
JP5060493B2 (ja) 2006-02-07 2012-10-31 セラニーズ・インターナショナル・コーポレーション エタンの酢酸／エチレンへの酸化方法における予備脱水塔の使用
EP1993727A4 (en) 2006-02-07 2012-07-04 Celanese Int Corp USE OF A CHEMICAL REACTION TO SEPARATE ETHYLENE FROM ETHANE IN ETHANE-BASED PROCESSES FOR THE PRODUCTION OF ACETIC ACID
CN101479215B (zh) 2006-06-23 2013-05-29 埃克森美孚化学专利公司 从甲烷生产芳族烃与合成气
US20080132723A1 (en) 2006-12-04 2008-06-05 Celanese International Corporation Process for the production of ethylene, acetic acid and carbon monoxide from ethane
US20090043141A1 (en) 2007-05-30 2009-02-12 Terry Mazanec Oxidative coupling of methane
BRPI1004975A2 (pt) 2009-12-08 2013-04-02 Haldor Topsoe A/S processo integrado para a produÇço de Ácido acÉtico, etileno e monâmero de acetato de vinila
CN101774912B (zh) 2010-02-21 2013-01-02 南京荣欣化工有限公司 一种生产醋酸酯的工艺
TW201634701A (zh) 2010-04-15 2016-10-01 安堤格里斯公司 廢棄印刷電路板之回收利用方法
CN103764614A (zh) 2011-08-31 2014-04-30 巴斯夫欧洲公司 Eddn或edmn氢化反应出料的后处理方法
US20130261348A1 (en) 2012-03-28 2013-10-03 Celanese International Corporation Process for Producing Ethanol by Alkane Oxidation and Hydrogenation or Hydration
WO2013148006A1 (en) * 2012-03-28 2013-10-03 Rohm And Haas Company Process for making ethylene and acetic acid
CN102731469B (zh) 2012-07-04 2013-12-25 宁波九胜创新医药科技有限公司 一种高纯度1,4-二氧六环-2-酮的制备方法
US9409156B2 (en) * 2012-10-19 2016-08-09 Instituto Mexicano Del Petroleo Oxidative dehydrogenation of ethane to ethylene and preparation of multimetallic mixed oxide catalyst for such process
US9545610B2 (en) 2013-03-04 2017-01-17 Nova Chemicals (International) S.A. Complex comprising oxidative dehydrogenation unit
US20140275619A1 (en) 2013-03-15 2014-09-18 Celanese International Corporation Process for Producing Acetic Acid and/or Ethanol By Methane Oxidation
CN104277021B (zh) 2013-07-02 2016-05-18 中国科学院大连化学物理研究所 催化转化5-羟甲基糠醛制备2,5-呋喃二酰胺的方法
US9238193B2 (en) 2013-07-23 2016-01-19 Chevron Phillips Chemical Company Lp Separations with ionic liquid solvents
WO2015059275A1 (en) 2013-10-25 2015-04-30 Shell Internationale Research Maatschappij B.V. Process for the oxidative dehydrogenation of ethane to ethylene
CA2833822C (en) 2013-11-21 2020-08-04 Nova Chemicals Corporation Inherently safe odh operation
WO2016149507A1 (en) 2015-03-17 2016-09-22 Siluria Technologies, Inc. Oxidative coupling of methane methods and systems
CN104672046B (zh) 2015-03-20 2017-01-11 中国石油大学(华东) 一种将碳四烯烃分离后回炼在催化裂化或裂解过程中增产乙烯和丙烯的方法
US10329222B2 (en) 2015-09-18 2019-06-25 Shell Oil Company Alkane oxidative dehydrogenation
CA3001434C (en) 2015-10-26 2023-10-03 Shell Internationale Research Maatschappij B.V. Ethane oxidative dehydrogenation and acetic acid recovery
WO2017114816A1 (en) 2015-12-29 2017-07-06 Shell Internationale Research Maatschappij B.V. Acetic acid extraction from aqueous streams
WO2017114826A1 (en) 2015-12-29 2017-07-06 Shell Internationale Research Maatschappij B.V. Acetic acid absorption from vaporous aqueous streams
WO2017114831A1 (en) 2015-12-29 2017-07-06 Shell Internationale Research Maatschappij B.V. Process for converting alkanes and/or alkenes to alkenes and carboxylic acids
WO2017114820A1 (en) 2015-12-29 2017-07-06 Shell Internationale Research Maatschappij B.V. Acetic acid extraction from liquid and vaporous aqueous streams
CN109071380B (zh) 2016-02-04 2022-03-29 国际壳牌研究有限公司 混合甲烷/乙烷流的转化
CA2935564A1 (en) 2016-07-07 2018-01-07 Nova Chemicals Corporation Inherently safe oxygen/hydrocarbon gas mixer
EP3548456A4 (en) 2016-12-02 2020-10-28 Lummus Technology LLC SYSTEMS AND METHODS FOR CONVERTING ETHYLENE INTO LIQUIDS
AU2017384130B2 (en) 2016-12-19 2020-03-05 Shell Internationale Research Maatschappij B.V. Ethane oxidative dehydrogenation with co-production of vinyl acetate
WO2018114900A1 (en) 2016-12-20 2018-06-28 Shell Internationale Research Maatschappij B.V. Oxidative dehydrogenation (odh) of ethane
FR3064630B1 (fr) 2017-04-04 2019-09-13 Arkema France Procede de purification d'acide (meth)acrylique incluant une colonne de distillation a paroi separatrice
CN107011169B (zh) 2017-04-25 2018-07-10 天津大学 一种乙炔法合成的醋酸乙烯的精制方法及装置
CN107089644A (zh) 2017-05-22 2017-08-25 南京百润化工有限公司 一种二氧化碳减排及综合利用的装置和方法
CN207451978U (zh) 2017-05-22 2018-06-05 南京百润化工有限公司 一种利用二氧化碳生产醋酸正丙酯的装置
CN107245034A (zh) 2017-05-22 2017-10-13 南京百润化工有限公司 一种利用二氧化碳生产醋酸正丙酯的装置和方法
AU2018273972B2 (en) 2017-05-25 2020-10-29 Hyconix, Inc. Oxidation of alkane to alkene
JP2020531444A (ja) 2017-08-16 2020-11-05 シエル・インターナシヨナル・リサーチ・マートスハツペイ・ベー・ヴエー エタンの酸化脱水素
CN111032600A (zh) 2017-08-16 2020-04-17 国际壳牌研究有限公司 乙烷氧化脱氢
TW201943709A (zh) 2018-04-09 2019-11-16 荷蘭商蜆殼國際研究公司 用於生產環氧乙烷之方法
CN110963879A (zh) * 2018-09-28 2020-04-07 中国科学院大连化学物理研究所 水作为原料气稀释剂的乙烷催化氧化制乙烯和乙酸的联产工艺方法
WO2020072163A1 (en) 2018-10-02 2020-04-09 Exxonmobil Chemical Patents Inc. Converting ethane to ethylene oxide using series reactors
US11447704B2 (en) 2018-10-11 2022-09-20 Nova Chemicals (International) S.A. Oxygenate separation using a metal salt
CN110256186A (zh) * 2019-06-19 2019-09-20 惠生工程（中国）有限公司 一种低碳烷烃氧化脱氢制烯烃的方法
CA3181387A1 (en) 2020-06-09 2021-12-16 Nova Chemicals Corporation Limiting acetic acid production in ethane odh process

Also Published As

Publication number Publication date
WO2021250495A1 (en) 2021-12-16
CA3181387A1 (en) 2021-12-16
CN115667203A (zh) 2023-01-31
US12325684B2 (en) 2025-06-10
JP2023529391A (ja) 2023-07-10
KR20230008195A (ko) 2023-01-13
EP4161897A1 (en) 2023-04-12
JP7684332B2 (ja) 2025-05-27
KR102908238B1 (ko) 2026-01-06
MX2022014701A (es) 2022-12-16
US20230202958A1 (en) 2023-06-29

Similar Documents

Publication Publication Date Title
BR112022024331A2 (pt) Produção limitante de ácido acético no processo de odh de etano
CL2011002085A1 (es) Proceso para produccion de quimicos a partir de lignina, que comprende la depolimerizacion de la lignina mediante hidrogenacion catalitica para obtener hidrocraburos ciclicos, que luego se someten a reaccion catalitica de desoxigenacion y deshidrogenacion para convertir los hidrocarburos ciclicos en compuestos aromaticos.
WO2015031357A3 (en) Catalytic alkane conversion
AR073939A1 (es) Proceso para producir monomero de estireno sobre la base de la deshidrogenacion oxidativa de etilbenceno usando co2 como un oxidante suave
BR112012010816A2 (pt) processo contínuo para fabricação de policarbonato alifático a partir de dióxido de carbono e compostos epóxido
WO2010024975A8 (en) Process for producing phenol
BR0014325A (pt) Processo para a produção de ciclohexano pela hidrogenação de benzeno
ES2127253T5 (es) Procedimiento para la produccion de fenol, acetona y alfa-metilestireno.
ES2192739T3 (es) Produccion de gas de sintesis con membranas mixtas conductoras.
BR112012024024A2 (pt) método para produzir cumeno a partir da alquilação do benzeno com propileno
BRPI1010906A8 (pt) Processo para produzir óxido de propileno.
MX2022002215A (es) Coproduccion en deshidrogenacion oxidativa.
BR112015024556A2 (pt) Método e planta para produção de metano
CN103159592A (zh) 二-（2-羟基异丙基）苯的生产方法
BR112013007087A2 (pt) aperfeiçoado controle de processo para a produção de óxido de olefina
Qin et al. Reaction coupling in the new processes for producing styrene from ethylbenzene
BR112023006247A2 (pt) Processo para a produção de formaldeído, e, uso de um catalisador
CN104876894B (zh) 环氧丙烷chppo装置副产过氧化二异丙苯dcp的方法
CN116354798B (zh) 一种可见光介导的环己基苯一步法制苯酚和环己酮的方法
WO2009114970A1 (zh) 一种催化氧化含异丙基芳烃制备过氧化氢物的方法
BR112013009788A2 (pt) processo contínuo para produção de acroleína por desidratação catalítica de glicerol ou glicerina na presença de um catalisador ácido, processo para fabricação, a partir de acroleina, de
BRPI0418869A (pt) métodos para a produção de ácido (met) acrìlico ou (met) acroleìna
SG171665A1 (en) Use of chemical reaction to separate ethylene from ethane in ethane-based processes to produce acetic acid
BR112023005254A2 (pt) Processo de desidrogenação oxidativa
BR112022012132A2 (pt) Remoção de monóxido de carbono, oxigênio e acetileno de um processo de desidrogenação oxidativo

Legal Events

Date Code Title Description
B06W Patent application suspended after preliminary examination (for patents with searches from other patent authorities) chapter 6.23 patent gazette]