RS20060284A - Catalyst and use thereof in the production of vinyl acetate - Google Patents

Catalyst and use thereof in the production of vinyl acetate

Info

Publication number
RS20060284A
RS20060284A YUP-2006/0284A YUP20060284A RS20060284A RS 20060284 A RS20060284 A RS 20060284A YU P20060284 A YUP20060284 A YU P20060284A RS 20060284 A RS20060284 A RS 20060284A
Authority
RS
Serbia
Prior art keywords
catalyst
vinyl acetate
production
promoter
acid
Prior art date
Application number
YUP-2006/0284A
Other languages
English (en)
Inventor
Simon James Kitchen
Daiyi Qin
Original Assignee
Bp Chemical Limited,
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 Bp Chemical Limited, filed Critical Bp Chemical Limited,
Publication of RS20060284A publication Critical patent/RS20060284A/sr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00—Polymerisation catalysts
    • C08F4/06—Metallic compounds other than hydrides and other than metallo-organic compounds; Boron halide or aluminium halide complexes with organic compounds containing oxygen
    • C08F4/26—Metallic compounds other than hydrides and other than metallo-organic compounds; Boron halide or aluminium halide complexes with organic compounds containing oxygen of manganese, iron group metals or platinum group metals
    • 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
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/66—Silver or gold
    • 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
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B01J23/44—Palladium
    • 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
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/48—Silver or gold
    • B01J23/52—Gold
    • 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
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56—Platinum group metals
    • 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
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56—Platinum group metals
    • B01J23/58—Platinum group metals with alkali- or alkaline earth metals
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00—Preparation of carboxylic acid esters
    • C07C67/04—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides onto unsaturated carbon-to-carbon bonds
    • C07C67/05—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides onto unsaturated carbon-to-carbon bonds with oxidation
    • C07C67/055—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides onto unsaturated carbon-to-carbon bonds with oxidation in the presence of platinum group metals or their compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Catalysts (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Abstract

Katalizator za korišćenje u proizvodnji vinilacetata koji se sastoji od (1) nosača katalizatora, (2) paladijuma, (3) kiseline, (4) najmanje jednog promotera kazalizatora sirćetne kiseline i (5) najmanje jednog promotera vinilacetata i/ili ko-promotera. Postupak za proizvodnju vinilacetata koji se sastoji u reagovanju etilena sa gasom koji sadrži kiseonik u prisustvu katalizatora.
YUP-2006/0284A 1998-05-22 1999-09-08 Catalyst and use thereof in the production of vinyl acetate RS20060284A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB9810928.3A GB9810928D0 (en) 1998-05-22 1998-05-22 Catalyst and process

Publications (1)

Publication Number Publication Date
RS20060284A true RS20060284A (en) 2007-09-21

Family

ID=10832459

Family Applications (1)

Application Number Title Priority Date Filing Date
YUP-2006/0284A RS20060284A (en) 1998-05-22 1999-09-08 Catalyst and use thereof in the production of vinyl acetate

Country Status (20)

Country Link
US (2) US6376706B2 (sr)
EP (1) EP0967009B1 (sr)
JP (1) JP4491063B2 (sr)
KR (2) KR19990088442A (sr)
CN (1) CN1149126C (sr)
BR (1) BR9917059B1 (sr)
CA (1) CA2272223A1 (sr)
DE (1) DE69935473T2 (sr)
ES (1) ES2284237T3 (sr)
GB (1) GB9810928D0 (sr)
ID (1) ID23346A (sr)
MY (1) MY129792A (sr)
NO (1) NO317804B1 (sr)
RS (1) RS20060284A (sr)
RU (1) RU2225254C2 (sr)
SA (1) SA99200490B1 (sr)
SG (1) SG83716A1 (sr)
TW (1) TWI258389B (sr)
UA (1) UA60322C2 (sr)
ZA (1) ZA993400B (sr)

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010040654A (ko) * 1998-02-05 2001-05-15 스티븐 아이. 밀러 Ｐｄ-Ａｕ 비닐 아세테이트 모노머 촉매의 노화 방지
EP1038578A3 (en) * 1999-03-26 2002-01-30 President of Shizuoka University, a government agency of Japan Method of producing formaldehyde directly from methane
DE19920390C2 (de) * 1999-05-04 2002-08-01 Celanese Chem Europe Gmbh Katalysator und Verfahren zur Herstellung von Vinylacetat
US6534438B1 (en) * 2000-07-26 2003-03-18 Bp Chemicals Limited Catalyst composition
JP2002079089A (ja) * 2000-09-07 2002-03-19 Showa Denko Kk 低級脂肪族カルボン酸エステル製造用触媒、該触媒の製造方法、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
DE10048844A1 (de) * 2000-10-02 2002-04-11 Basf Ag Verfahren zur Herstellung von Platinmetall-Katalysatoren
GB0026241D0 (en) * 2000-10-26 2000-12-13 Bp Chem Int Ltd Process
CA2448322A1 (en) 2001-03-30 2002-10-10 Shell Internationale Research Maatschappij B.V. Process for preparing a group viii-metal containing catalyst, use thereof for preparing an alkenyl carboxylate
DE10124600A1 (de) * 2001-05-21 2002-11-28 Basf Ag Ni/Ti02-Hydrierkatalysator
JP4421201B2 (ja) 2002-03-27 2010-02-24 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 触媒を調製する方法、触媒、および触媒の使用
TW200539941A (en) 2003-12-19 2005-12-16 Celanese Int Corp Methods of making alkenyl alkanoates
US7468455B2 (en) 2004-11-03 2008-12-23 Velocys, Inc. Process and apparatus for improved methods for making vinyl acetate monomer (VAM)
UA95442C2 (ru) * 2004-12-20 2011-08-10 Селаниз Интернешнл Корпорейшн Модифицированные материалы носителей для катализаторов
US8227369B2 (en) 2005-05-25 2012-07-24 Celanese International Corp. Layered composition and processes for preparing and using the composition
WO2007145151A1 (en) * 2006-06-13 2007-12-21 Showa Denko K.K. Process for production of supported catalyst for acetic acid production
JP4963922B2 (ja) * 2006-10-04 2012-06-27 昭和電工株式会社 酢酸アルケニル製造用触媒の製造方法
US7825204B2 (en) * 2006-12-19 2010-11-02 Lyondell Chemical Technology, L.P. Inorganic oxide extrudates
JP4969501B2 (ja) * 2007-04-13 2012-07-04 昭和電工株式会社 酢酸アリル製造用触媒の製造方法
US7811968B2 (en) * 2007-05-11 2010-10-12 Lyondell Chemical Technology, L.P. Preparation of palladium-gold catalysts
TW200934581A (en) * 2007-11-07 2009-08-16 Sumitomo Chemical Co Method for preparing ketone compound
US20100121100A1 (en) * 2008-11-12 2010-05-13 Daniel Travis Shay Supported palladium-gold catalysts and preparation of vinyl acetate therewith
WO2011033689A1 (en) 2009-09-18 2011-03-24 Nippon Kayaku Kabushiki Kaisha Catalyst and process for preparing acrolein and/or acrylic acid by dehydration reaction of glycerin
US8440855B2 (en) * 2009-12-08 2013-05-14 Haldor Topsoe A/S Process for the production of acetic acid ethylene and vinyl acetate monomer
US8273682B2 (en) * 2009-12-16 2012-09-25 Lyondell Chemical Technology, L.P. Preparation of palladium-gold catalyst
US8329611B2 (en) * 2009-12-16 2012-12-11 Lyondell Chemical Technology, L,P. Titania-containing extrudate
US8507720B2 (en) * 2010-01-29 2013-08-13 Lyondell Chemical Technology, L.P. Titania-alumina supported palladium catalyst
US20120149939A1 (en) 2010-12-10 2012-06-14 Celanese International Corporation Recovery of Acetic Acid from Heavy Ends in Vinyl Acetate Synthesis Process
DE102011081786A1 (de) * 2011-08-30 2013-02-28 Wacker Chemie Ag Verfahren zur Acetoxylierung von Olefinen in der Gasphase
CN106999899A (zh) 2014-10-20 2017-08-01 维洛塞斯科技有限公司 去除热量的过程
RU2702107C1 (ru) * 2018-10-22 2019-10-04 Пуцзин Кемикал Индастри Ко., Лтд Катализатор карбонилирования и его получение
TW202128605A (zh) 2019-12-19 2021-08-01 美商瑟蘭斯國際股份有限公司 於乙酸乙烯酯製造期間監測各式流之可燃性之方法及系統
TWI718818B (zh) * 2019-12-19 2021-02-11 財團法人工業技術研究院 氫化不飽和多元酸的觸媒與方法
TW202204892A (zh) 2020-06-29 2022-02-01 美商瑟蘭斯國際股份有限公司 於乙酸乙烯酯製造之金屬離子原位分析
CN114425454B (zh) * 2020-10-14 2024-02-02 中国石油化工股份有限公司 醋酸乙烯催化剂及醋酸乙烯合成方法

Family Cites Families (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1230009B (de) 1964-06-05 1966-12-08 Hoechst Ag Verfahren zur Herstellung von Acetaldehyd und Essigsaeure und gleichzeitig von Vinylacetat
DE1252662B (sr) * 1965-06-25
US3373189A (en) 1965-07-09 1968-03-12 Nat Distillers Chem Corp Vapor phase process for producing vinyl acetate from ethylene
US3450748A (en) 1966-05-11 1969-06-17 Union Oil Co Preparation of vinyl acetate,acetaldehyde and acetic acid from ethylene
US3485877A (en) * 1966-10-21 1969-12-23 Eastman Kodak Co Process for converting ethylenically unsaturated hydrocarbons to carbonylic compounds
DE1667053C3 (de) * 1967-12-02 1975-10-09 Hoechst Ag, 6000 Frankfurt Verfahren zur Herstellung eines Palladiumkatalysators
US3627821A (en) * 1967-12-23 1971-12-14 Knapsack Ag Process for the manufacture of unsaturated esters of carboxylic acids
DE2160649A1 (de) * 1971-12-07 1973-06-14 Hoechst Ag Verfahren zur herstellung von allylacetat
US3969274A (en) * 1974-03-14 1976-07-13 National Distillers And Chemical Corporation Fixed bed catalyst
JPS514118A (en) * 1974-06-27 1976-01-14 Kuraray Co Sakusanbiniruno seizohoho
US3970697A (en) 1974-07-01 1976-07-20 National Distillers And Chemical Corporation Oxidation of ethylene to acetic acid
DE2509251C3 (de) * 1975-03-04 1978-07-13 Hoechst Ag, 6000 Frankfurt Verfahren zur Herstellung eines Palladiumkatalysators
GB1571910A (en) * 1975-12-18 1980-07-23 Nat Distillers Chem Corp Vinyl acetate process and catalyst therefor
DE2601154A1 (de) * 1976-01-14 1977-07-21 Bayer Ag Neuer katalysator, seine herstellung und verwendung
US4048096A (en) * 1976-04-12 1977-09-13 E. I. Du Pont De Nemours And Company Surface impregnated catalyst
US4188490A (en) * 1977-05-27 1980-02-12 National Distillers And Chemical Corporation Catalytic oxidation of ethylene to mixtures of acetic acid and vinyl acetate
JPS56123946A (en) * 1980-03-05 1981-09-29 Asahi Chem Ind Co Ltd Preparation of unsaturated carboxylic acid ester
GB2070601B (en) * 1980-03-05 1984-05-23 Asahi Chemical Ind Producing unsaturated carboxylic esters
US5218140A (en) * 1988-08-02 1993-06-08 Union Carbide Chemicals & Plastics Technology Corporation Carbonylation reaction and catalyst therefor
US5557014A (en) * 1990-03-05 1996-09-17 Catalytica, Inc. Catalytic system for olefin oxidation to carbonyl products
US5179056A (en) * 1991-05-06 1993-01-12 Union Carbide Chemicals & Plastics Technology Corporation Production of alkenyl alkanoate catalysts
US5185308A (en) * 1991-05-06 1993-02-09 Bp Chemicals Limited Catalysts and processes for the manufacture of vinyl acetate
TW295579B (sr) * 1993-04-06 1997-01-11 Showa Denko Kk
US5347046A (en) * 1993-05-25 1994-09-13 Engelhard Corporation Catalyst and process for using same for the preparation of unsaturated carboxylic acid esters
DE4323980C1 (de) * 1993-07-16 1995-03-30 Hoechst Ag Palladium und Kalium sowie Cadmium, Barium oder Gold enthaltender Schalenkatalysator, Verfahren zu dessen Herstellung sowie dessen Verwendung zur Herstellung von Vinylacetat
DE4323978C1 (de) * 1993-07-16 1995-02-16 Hoechst Ag Palladium und Kalium sowie Cadmium, Barium oder Gold enthaltender Schalenkatalysator, Verfahren zu dessen Herstellung sowie dessen Verwendung zur Herstellung von Vinylacetat
DE4323981C1 (de) * 1993-07-16 1995-03-09 Hoechst Ag Palladium und Kalium sowie Cadmium, Barium oder Gold enthaltender Schalenkatalysator, Verfahren zu dessen Herstellung sowie dessen Verwendung zur Herstellung von Vinylacetat
CA2135021A1 (en) * 1993-11-19 1995-05-20 David J. Gulliver Process for the preparation of catalysts for use in the production of vinyl acetate
US5466652A (en) * 1994-02-22 1995-11-14 The Standard Oil Co. Process for the preparation of vinyl acetate catalyst
US5665667A (en) * 1994-06-02 1997-09-09 The Standard Oil Company Process for the preparation of vinyl acetate catalyst
DE19501891C1 (de) * 1995-01-23 1996-09-26 Degussa Verfahren zur Herstellung eines Trägerkatalysators und seine Verwendung für die Produktion von Vinylacetat
DE19523271A1 (de) * 1995-06-27 1997-01-02 Hoechst Ag Katalysator und Verfahren zur Herstellung von Vinylacetat
US5576457A (en) * 1995-05-23 1996-11-19 Hoechst Celanese Corporation Catalyst and procedure for preparation of vinyl acetate
US6022823A (en) * 1995-11-07 2000-02-08 Millennium Petrochemicals, Inc. Process for the production of supported palladium-gold catalysts
US5705679A (en) * 1996-04-02 1998-01-06 Nicolau; Ioan Honeycomb catalyst for vinyl acetate synthesis
DE19619961A1 (de) * 1996-05-17 1997-11-20 Degussa Preßlinge auf Basis von pyrogen hergestelltem Siliciumdioxid
GB9616573D0 (en) 1996-08-07 1996-09-25 Bp Chem Int Ltd Process
JPH1072403A (ja) * 1996-08-28 1998-03-17 Showa Denko Kk 酢酸ビニルの製造法
GB9622911D0 (en) * 1996-11-04 1997-01-08 Bp Chem Int Ltd Process
US5777715A (en) * 1997-01-21 1998-07-07 Allen Vision Systems, Inc. Low vision rehabilitation system
DE19754991C2 (de) * 1997-12-11 2000-03-23 Celanese Chem Europe Gmbh Katalysator, Verfahren zur Herstellung des Katalysators und Verfahren zur Herstellung von Vinylacetat unter Einsatz des Katalysators
US6072078A (en) * 1997-12-12 2000-06-06 Celanese International Corporation Vinyl acetate production using a catalyst comprising palladium, gold, copper and any of certain fourth metals
KR20010040654A (ko) * 1998-02-05 2001-05-15 스티븐 아이. 밀러 Ｐｄ-Ａｕ 비닐 아세테이트 모노머 촉매의 노화 방지

Also Published As

Publication number Publication date
ES2284237T3 (es) 2007-11-01
CN1243038A (zh) 2000-02-02
CN1149126C (zh) 2004-05-12
KR20060077908A (ko) 2006-07-05
ZA993400B (en) 2000-11-20
BR9917059A (pt) 2001-12-11
DE69935473D1 (de) 2007-04-26
UA60322C2 (uk) 2003-10-15
JP4491063B2 (ja) 2010-06-30
TWI258389B (en) 2006-07-21
GB9810928D0 (en) 1998-07-22
EP0967009B1 (en) 2007-03-14
KR19990088442A (ko) 1999-12-27
NO992461L (no) 1999-11-23
BR9917059B1 (pt) 2010-10-19
DE69935473T2 (de) 2007-12-06
NO317804B1 (no) 2004-12-13
EP0967009A2 (en) 1999-12-29
MY129792A (en) 2007-04-30
SA99200490B1 (ar) 2006-11-14
JP2000000473A (ja) 2000-01-07
US6472556B2 (en) 2002-10-29
EP0967009A3 (en) 2000-04-12
US20010012818A1 (en) 2001-08-09
CA2272223A1 (en) 1999-11-22
NO992461D0 (no) 1999-05-21
RU2225254C2 (ru) 2004-03-10
US6376706B2 (en) 2002-04-23
SG83716A1 (en) 2001-10-16
ID23346A (id) 2000-04-05
US20010049335A1 (en) 2001-12-06

Similar Documents

Publication Publication Date Title
RS20060284A (en) Catalyst and use thereof in the production of vinyl acetate
MY120088A (en) Catalyst and process for preparing vinyl acetate.
AU2157097A (en) Catalyst and process for preparing vinyl acetate
AU3030997A (en) Oxidation catalyst and process for the production of epoxides from olefines, hydrogen and oxygen using said oxidation catalyst
AU5119198A (en) Preparation of hydrogen peroxide
MY110744A (en) Process for producing acetic acid
MY120308A (en) Process for the production of vinyl acetate and process for the preparation of a catalyst
NZ335443A (en) Process for the preparation of vinyl acetate
MY121382A (en) Vinyl acetate catalyst comprising metallic palladium and gold prepared with potassium aurate
HUP9903871A2 (hu) Eljárás palládium-arany katalizátor előállítására vinil-acetát gyártásához
NZ505647A (en) Magnesium, calcium, barium or zirconium used as a fourth metal catalyst in the production of vinyl acetate
MY118607A (en) Catalyst and process for preparing vinyl acetate
BR9809715B1 (pt) catalisador para produÇço de acetato vinÍlico por reaÇço de etileno, oxigÊnio e Ácido acÉtico e processo para produÇço do mesmo.
NZ504695A (en) Vinyl acetate catalyst comprising metallic palladium and gold, and cupric acetate
BG96466A (en) Process for the preparation of vinylacetate
MY112972A (en) Catalyst and process for preparing vinyl acetate
CA2297428A1 (en) Process for the preparation of 1,2-dichloroethane from oxychlorination
YU44499A (sh) Katalizator i njegova upotreba u proizvodnji vinilacetata
BR9813560A (pt) Catalisador à base de paládio, cádmio, metal alcalino e lantanóides e processo para preparação de acetato de vinila
CA2395380A1 (en) Process for the production of olefins
CA2288293A1 (en) Method for producing acetic acid in a reactor cascade
TH34847B (th) ตัวเร่งปฏิกิริยาและกรรมวิธีการเตรียมไวนิลอะซีเทต
CA2251476A1 (en) Catalyst and process for the preparation of vinyl acetate
TH26235A (th) ตัวเร่งปฏิกิริยาและกระบวนการสำหรับการเตรียมไวนิลแอซีเตต
TH34847A (th) ตัวเร่งปฏิกิริยาและกรรมวิธีการเตรียมไวนิลอะซีเทต