GB1566882A - Creación de Inventos y Patentes con Inteligencia Artificial

GB1566882A – Catalyst compositions especially useful for preparation of unsaturated acids
– Google Patents

GB1566882A – Catalyst compositions especially useful for preparation of unsaturated acids
– Google Patents
Catalyst compositions especially useful for preparation of unsaturated acids

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Publication number
GB1566882A

GB1566882A
GB50270/76A
GB5027076A
GB1566882A
GB 1566882 A
GB1566882 A
GB 1566882A
GB 50270/76 A
GB50270/76 A
GB 50270/76A
GB 5027076 A
GB5027076 A
GB 5027076A
GB 1566882 A
GB1566882 A
GB 1566882A
Authority
GB
United Kingdom
Prior art keywords
catalyst
catalyst composition
antimony
acrolein
ingredients
Prior art date
1976-01-02
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.)

Expired

Application number
GB50270/76A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Standard Oil Co

Original Assignee
Standard Oil Co
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.)
1976-01-02
Filing date
1976-12-02
Publication date
1980-05-08

1976-12-02
Application filed by Standard Oil Co
filed
Critical
Standard Oil Co

1980-05-08
Publication of GB1566882A
publication
Critical
patent/GB1566882A/en

Status
Expired
legal-status
Critical
Current

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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

C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen

C07C51/25—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of unsaturated compounds containing no six-membered aromatic ring

C07C51/252—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of unsaturated compounds containing no six-membered aromatic ring of propene, butenes, acrolein or methacrolein

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

B01J23/002—Mixed oxides other than spinels, e.g. perovskite

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

B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper

B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 – B01J23/36

B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 – B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium

B01J23/85—Chromium, molybdenum or tungsten

B01J23/88—Molybdenum

B01J23/887—Molybdenum containing in addition other metals, oxides or hydroxides provided for in groups B01J23/02 – B01J23/36

B01J23/8877—Vanadium, tantalum, niobium or polonium

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

B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium

B01J23/18—Arsenic, antimony or bismuth

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

B01J23/20—Vanadium, niobium or tantalum

B01J23/22—Vanadium

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

B01J23/24—Chromium, molybdenum or tungsten

B01J23/28—Molybdenum

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

B01J2523/00—Constitutive chemical elements of heterogeneous catalysts

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

B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts

B01J37/02—Impregnation, coating or precipitation

B01J37/0236—Drying, e.g. preparing a suspension, adding a soluble salt and drying

Description

PATENT SPECIFICATION, 1 566 882
( 21) Application No 50270/76 ( 22) Filed 2 Dec 1976 ( 19) ( 31) Convention Application No 646224 ( 32) Filed 2 Jan 1976 in ( 33) United States of America (US) ( 44) Complete Specification Published 8 May 1980 ( 51) INT CL 3 B 01 J 23/88 -^ C(C 7 C 51/25 57/05 ( 52) Index at Acceptance BIE 1156 1298 1331 1401 1414 1422 1492 1497 1611 1624 1631 1704 1709 1720 1738 1743 AA ( 54) CA’TALYST COMPOSITIO()NS ESPECIALIL Y USIIFUL FOR PREPARATION OF UNSA’ITURATID ACII)S ( 71) We,THESTANDARDOIL COMPANY, a corporationorganised underthe laws of the State of Ohio, United States of America, of Midland Building, Cleveland, Ohio 44115, United States of America, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be
particularly described in aind by the following statement: 5
This invention relates to a novel catalyst composition, which is particularly useful in oxidation reactions, such as the production of acrylic acid from acrolein and methacrylic acid from methacrolein.
The catalyst compositions of the invention comprise oxide complexes of vanadium, molybdenum and copper together with an additional metal oxide which may be antimony 10 oxide or a mixture of antimony oxide and germanium oxide As indicated these catalyst compositions are especially useful for producing acrylic acid from acrolein and for producing methacrylic acid from methacrolein.
Catalyst compositions similar to those of the invention are disclosed in Belgain Patent No 773,851 which discloses catalysts of the compositon molybdenum, vanadium, tungsten 15 and antimony and one or more of the oxides of lead, silver, tin, titanium, copper and bismuth U S Patent No 3,736,354 discloses the catalyst compositions containing the oxides of vanadium, molybdenum and germanium and the oxides of vanadium, molybdenum and copper German Patent No 2,414,797 discloses a catalyst for the production of acrylic and methacrylic acids from acrolein or methacrolein which contains 20 the metal oxides of molybdenum, vanadium, copper and at least one element of the group of iron, cobalt, nickel and magnesium U S Patent No 3,725,472 discloses a catalyst for the oxidation of a, P-unsaturated carbonylic compounds to the corresponding unsaturated acids employing a catalyst containing the oxides of molybdenum, vanadium and antimony.
None of the foregoing patents, however, disclose the catalyst compositions of the present 25 invention or the fact that unexpectedly high yields of unsaturated carboxylic acids are obtained from the corresponding unsaturated aldehydes in the presence of these catalysts.
As indicated, the catalyst composition according to the invention comprises a catalyst having the empirical formula 30 Moa Vb C Uc Xd Oc wherein X is antimony or a mixture of antimony and germanium, a is a number from 6 to 18, b, c and d are each 0 1 to 6 and 35 e is the number of oxygen atoms required to satisfy the valence requirements of the other elements present.
These catalyst compositions are especially effective for preparing arcylic acid from acrolein and the preparation of methacrylic acid from methacrolein The catalyst compositions are 40 also highly effective for oxidation reactions such as the oxidation of butadiene to maleic anhydride and the oxidation of the butenes and the aromatics to various oxygenated compounds The catalyst compositions of the present invention are highly reactive and are capable of catalysing very selectively the oxidation of acrolein to acrylic acid, with little acetic acid being formed 45 2 1 566 882 2 The catalysts of the invention may be prepared by mixing the catalyst forming ingredients in the proper proportions, preferably in an aqueous mixture and drying the resulting aqueous slurry with or without a reducing agent, and calcining the product The ingredients employed in the preparation of the catalysts can be the oxides, halides, nitrates, acetates or other salts of the particular compound added, and particularly preferred is the use of water 5 soluble salts of the metal components If a support is used, the material comprising the support may be incorporated into the catalyst along with the other ingredients or the catalytic ingredient may be coated on an inert core After the catalyst ingredients have been combined to form an aqueous slurry, the slurry is evaporated to dryness, and the dried solid obtained is heated in the presence of air at temperature between about 2000 and 600 C This 10 calcination can take place outside of the catalytic reactor or an in situ activation could be utilized.
In addition to the active catalytic ingredients the catalysts of the invention may contain a support material Suitable support materials include silica, alumina, zirconia, titania, silicon carbide, boron phosphate and the like A preferred support material is Alundum 15 (Registered Trade Mark) Also contemplated in this invention is the incorporation of metal oxide promoters in the catalyst compositions to enhance further their activity.
As noted above, the catalyst of the invention are useful in a number of different oxidation reactions Preferred among these reactions is the production of unsaturated acids from the corresponding unsaturated aldehydes In such a process, acrylic acid or methacrylic acid is 20 produced by reacting acrolein or methacrolein with molecular oxygen in the presence of steam at a temperature of about 2000 to about 500 C Of special interest is the preparation of acrylic acid from acrolein because of the extremely desirable results obtained.
The oxidation of unsaturated aldehydes to obtain the corresponding acid is well known in the art Basically, the invention, with respect to the process, is the use of the new catalyst 25 within the parameters of the known art process.
The known process involves the contacting of the unsaturated aldehyde with molelcular oxygen in the presence of steam at a temperature of 200 C to 500 C The ratio of the reactants may vary widely with molar ratios of molecular oxygen to aldehyde of about 0 5 to about 5 moles normally being employed Molecular oxygen is most conveniently added as 30 air The amount of steam may vary widely from the small amount generated in the reaction to 20 or more moles of steam per mole of aldehyde In the preferred practice of the invention 1 to 10 moles of steam are added to the reactant feed.
The reaction may be conducted in a fixed or fluid-bed reactor using atmospheric, superatmospheric or subatmospheric pressure The apparent contact time may vary 35 considerably with contact times of a fraction of a second to 20 seconds or more normally being employed.
The following Examples illustrate the invention:COMPARATIVE EXAMPLES A C AND EXAMPLE 1 40 The catalysts of the invention were prepared and compared to the known catalyst compositions of U S Patent No 3,736,354 (Examples A & B), U S Patent No 3, 725,472 (Example C) and German patent No 2,414,797 (Example D) for the reaction of the oxidation of acrolein to acrylic acid.
The catalysts of the comparative examples were prepared as follows 45 COMPARATIVE EXAMPLE A Mo 12 V 3 CU 050440 To 250 cc of hot distilled water was added 6 88 g of ammonium metavanadate After approximately 15 minutes of heating and stirring, the reagent was dissolved and 4154 g of 50 ammonium heptamolybdate was added to the solution The ammonium heptamolybdate and 1 96 g of cupric acetate which was added subsequently, dissolved almost immediately.
The solution was evaporated to near dryness with continual stirring and the catalyst was then placed in a drying oven at 110 ‘C-120 ‘C for 16 hours The dried material was crushed and ground through a 50 mesh screen A sufficient amount of catalyst was employed to coat 55 3/16 spheres to achieve a twenty weight percent coating on the spheres The coated spheres were then dried at 110 ‘-1200 C for three hours and then activated by heat treating at 370 WC for two hours.
COMPARATIVE EXAMPLE B 60 Mo 0,V 3 Ge O 454 The procedure of comparative Example A was repeated with the exception that 6 67 g of ammonium metavanadate and 40 27 g of ammonium heptamolybdate were used, and 1 99 g of germanium dioxide was employed in place of the copper acetate.
1 566 882 COMPARATIVE EXAMPLE C Mo,2 V 3 Sb O 45 o The procedure of Comparative Example A was repeated using 6 54 g of ammonium metavanadate and 39 50 g of ammonium heptamolybdate, and 2 71 g antimony oxide (Sb 203) was employed in place of the copper acetate 5 COMPARATIVE EXAMPLE D Mo,2 YV Cuo s Ni O 45 The procedure of Comparative Example A was repeated using 6 61 g of ammonium metavanadate, 39 93 g of ammonium heptamolybdate, 1 88 g of cupric acetate and 5 47 g of 10 nickel nitrate hexahydrate, these ingredients being added to the aqueous solution in that order.
The preparation of the catalysts in the Examples representative of the invention are given below.
15 EXAMPLE
Mol 2 V 3 Cuo 55 b O 46 To 250 cc of hot distilled water was added 6 38 g of ammonium metavanadate After approximately 15 min of heating and stirring, the reagent was dissolved and 38 49 g of ammonium heptamolybdate was added to the solution The ammonium heptamolybdate, 20 and 1 81 g of cupric acetate which was added subsequently dissolved almost immediately.
2.64 g of antimony oxide (Sb 203) was added and the solution was evaporated to near dryness with continual stirring The catalyst was then placed in a drying oven for 16 hours at 110-120 C and the dried material was crushed and ground to pass through a 50 mesh screen.
A sufficient amount of catalyst was employed to coat 3/16 » spheres of Alundum to achieve a 25 twenty weight percent coating on the spheres The coated spheres were then dried at -120 C for three hours and then activated by heat treating at 370 C for two hours.
The catalysts prepared above were placed in a fixed bed reactor constructed of a 1 0 cm.
inside diameter stainless steel tube having a reaction zone of 20 cc capacity The reactor was heated in a split block furnace The reactor was fed with a mixture of acrolein/air/N 2/ 30 steam in the molar ratio of 1/8 5/2 5/6 The apparent contact time was 2 seconds The temperature of the surrounding block is given in Table 1 The results are also given in Table 1 using the following definitions:
Single Pass Yield, % = Moles of product recovered x 100 35 Moles of acrolein fed Convers, % -Moles of acrolein reacted x 100 ersion, Moles of acrolein fed Selectivity, % Moles of acrylic acid recovered x 100 40 Moles of acrolein reacted TABLE I
Mo 12 V 3 Cu 50544,0 Mo 12 V 3 Ge O 455 Mo 02 V 35 b O 45 O Mo 12 V 3 Cuo,5 Ni O 45 O Mo 12 V 3 Cu()55 b O 46 5 Temp, C 342 321 356 341 330 %c Single Pass Yield Acrylic Acetic Acid Acid 52.6 1 9 91.2 1 4 49.2 1 4 48.2 1 5 90.9 2 0 % Conversion 73.5 97.5 66.1 63.6 99.4 % Selectivity 71.6 93.5 74.4 75.8 91.4 ( 1) 20 % active component on 3/16 » Alundum (a-alumina) spheres.
Oxidation of acrolein to acrylic acid Example Catalyst ( 1) Comp A Comp B Comp C Comp D in 1 566 882

Claims (1)

WHAT WE CLAIM IS:
1 A catalyst composition which comprises a catalyst having the empirical formula:
M Oa Vb C Uc Xd Oe wherein X is antimony or a mixture of antimony and germanium, and wherein a is a number from 6 to 18; b, c and d each are 0 1 to 6; and e is the number of oxygens required to satisfy the valence requirements of the other metals present 10 2 A catalyst composition as claimed in claim 1 in which X is antimony.
3 A catalyst composition as claimed in Claim 1 in which X is a mixture of antimony and germanium.
4 A catalyst composition as claimed in any of claims 1 to 3 containing an inert support material in addition to the active catalytic ingredients 15 A catalyst composition as claimed in any of claims 1 to 4 further containing metal oxide promoters.
6 A catalyst composition as claimed in claim 1 substantially as herein described with reference to the Examples.
7 A process for the preparation of a catalyst composition as claimed in any of claims 1 20 to 6 in which the catalyst-forming ingredients are mixed in predetermined proportions, if desired in the prsence of a support material, and calcined.
8 A process as claimed in claim 7 in which the mixture formed is aqueous and the resulting slurry is calcined.
9 A process as claimed in claim 7 or claim 8 in which the catalystforming ingredients 25 are the appropriate water-soluble salts.
A process as claimed in claim 7 substantially as herein described with reference to Example 4.
11 Catalyst compositions as claimed in any of claims 1 to 6 when prepared by a process as claimed in any of claims 7 to 10 30 12 A process for the formation by catalytic oxidation of acrylic acid or methacrylic acid from acrolein or methacrolein with molecular oxygen in the presence of steam at a temperature of 2000 to 5000 C in which as catalyst there is employed a catalyst composition as claimed in any of claims 1 to 6 or 11.
13 A process as claimed in claim 12 in which acrylic acid is prepared from acrolein 35 14 A process as claimed in claim 12 substantially as herein described with reference to Example 1.
Acrylic and/or methacrylic acid when made by a process as claimed in any of claims 12 to 14.
40 ELKINGTON AND FIFE.
Chartered Patent Agents, High Holborn House, 52/54 High Holborn.
London WC 1 V 6 SH 45 Agents for the Applicants.
Printed tor Her Majesty’s Stationery Otficc hy Croydon Printing Company Limited Croydon, Surrey, 1980.
Published by The Patent Office 25 Southampton Buildings London WC 2 A IAY from which copies may be obtained c

GB50270/76A
1976-01-02
1976-12-02
Catalyst compositions especially useful for preparation of unsaturated acids

Expired

GB1566882A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

US05/646,224

US4051180A
(en)

1976-01-02
1976-01-02
Preparation of acrylic acid and methacrylic acid

Publications (1)

Publication Number
Publication Date

GB1566882A
true

GB1566882A
(en)

1980-05-08

Family
ID=24592253
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB50270/76A
Expired

GB1566882A
(en)

1976-01-02
1976-12-02
Catalyst compositions especially useful for preparation of unsaturated acids

Country Status (11)

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Link

US
(2)

US4051180A
(en)

JP
(1)

JPS5285091A
(en)

AT
(1)

AT357986B
(en)

BE
(1)

BE849908A
(en)

CA
(1)

CA1068670A
(en)

DE
(1)

DE2654188A1
(en)

ES
(1)

ES453887A1
(en)

FR
(1)

FR2336972A1
(en)

GB
(1)

GB1566882A
(en)

IT
(1)

IT1067287B
(en)

NL
(1)

NL7614499A
(en)

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Publication date
Assignee
Title

US7850928B2
(en)

2001-01-25
2010-12-14
Nippon Shokubai Co., Ltd.
Fixed-bed shell-and-tube reactor and its usage

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Publication date
Assignee
Title

USRE31088E
(en)

1972-02-09
1982-11-23
Standard Oil Company
Process for the manufacture of unsaturated aldehydes and acids from the corresponding olefins

US4169070A
(en)

1978-04-12
1979-09-25
Halcon Research And Development Corporation
Catalyst and process for producing unsaturated acids by using same

US4280928A
(en)

1979-10-12
1981-07-28
Rohm And Haas Company
Catalyst compositions and their use for the preparation of methacrolein

US4256915A
(en)

1979-12-26
1981-03-17
Standard Oil Company
Production of ethylenically unsaturated aliphatic acids

US4301038A
(en)

1979-12-26
1981-11-17
Standard Oil Company
Catalyst for the production of unsaturated aliphatic acids

US4560673A
(en)

1983-12-12
1985-12-24
The Standard Oil Company
Catalyst for the oxidation of unsaturated aldehydes

US5210293A
(en)

1989-07-05
1993-05-11
Bp Chemicals Limited
Process and catalyst for the production of ethylene and acetic acid

US5260250A
(en)

1989-07-05
1993-11-09
Bp Chemicals Limited
Catalyst for the production of ethylene and acetic acid

JP3786297B2
(en)

1995-03-03
2006-06-14
日本化薬株式会社

Catalyst production method

JP3537253B2
(en)

1996-03-06
2004-06-14
株式会社日本触媒

Method for producing acrylic acid

US6514902B1
(en)

1998-08-28
2003-02-04
Asahi Kasei Kogyo Kabushiki Kaisha
Method for producing an oxide catalyst for use in producing acrylonitrile or methacrylonitrile from propane or isobutane

JP3883755B2
(en)

1999-09-17
2007-02-21
日本化薬株式会社

Catalyst production method

US6762148B2
(en)

1999-09-17
2004-07-13
Nippon Kayaku Kabushiki Kaisha
Catalyst process of making

JP3744751B2
(en)

1999-12-08
2006-02-15
株式会社日本触媒

Support, composite oxide catalyst, and method for producing acrylic acid

US6953768B2
(en)

2002-11-26
2005-10-11
Teck Cominco Metals Ltd.
Multi-component catalyst system for the polycondensation manufacture of polyesters

JP4813758B2
(en)

2003-02-27
2011-11-09
株式会社日本触媒

Composite oxide catalyst and method for producing acrylic acid using the same

KR100497175B1
(en)

2003-03-26
2005-06-23
주식회사 엘지화학
Method for preparing catalysts for partial oxidation of propylene and iso-butylene

JPWO2009147965A1
(en)

2008-06-02
2011-10-27
日本化薬株式会社

Catalyst and method for producing unsaturated aldehyde and unsaturated carboxylic acid

WO2010001732A1
(en)

2008-06-30
2010-01-07
株式会社日本触媒
Method of packing solid particulate substance into fixed-bed multitubular reactor

JP2011121048A
(en)

2009-12-09
2011-06-23
Rohm & Haas Co
Method for blending and loading solid catalyst material into tubular structure

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Assignee
Title

GB1106648A
(en)

1965-11-10
1968-03-20
Distillers Co Yeast Ltd
Improvements in or relating to the production of unsaturated aliphatic acids

NL147411B
(en)

1968-05-13
1975-10-15
Rikagaku Kenkyusho

PROCESS FOR PREPARING ACRYLIC ACID BY CATALYTIC OXIDATION OF ACROLEIN IN THE VAPOR PHASE.

US3867438A
(en)

1970-10-13
1975-02-18
Degussa
Process for the oxidation of {60 ,{62 -unsaturated aldehydes to {60 ,{62 -unsaturated carboxylic acids

JPS4911371B1
(en)

1970-10-23
1974-03-16
Nippon Catalytic Chem Ind

1976

1976-01-02
US
US05/646,224
patent/US4051180A/en
not_active
Expired – Lifetime

1976-07-26
US
US05/708,812
patent/US4082698A/en
not_active
Expired – Lifetime

1976-11-03
CA
CA264,848A
patent/CA1068670A/en
not_active
Expired

1976-11-26
IT
IT29870/76A
patent/IT1067287B/en
active

1976-11-30
DE
DE19762654188
patent/DE2654188A1/en
not_active
Withdrawn

1976-12-02
AT
AT893676A
patent/AT357986B/en
not_active
IP Right Cessation

1976-12-02
ES
ES453887A
patent/ES453887A1/en
not_active
Expired

1976-12-02
GB
GB50270/76A
patent/GB1566882A/en
not_active
Expired

1976-12-07
JP
JP14762376A
patent/JPS5285091A/en
active
Pending

1976-12-28
BE
BE173680A
patent/BE849908A/en
unknown

1976-12-28
NL
NL7614499A
patent/NL7614499A/en
not_active
Application Discontinuation

1976-12-31
FR
FR7639786A
patent/FR2336972A1/en
active
Pending

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US7850928B2
(en)

2001-01-25
2010-12-14
Nippon Shokubai Co., Ltd.
Fixed-bed shell-and-tube reactor and its usage

Also Published As

Publication number
Publication date

US4051180A
(en)

1977-09-27

BE849908A
(en)

1977-04-15

DE2654188A1
(en)

1977-07-14

FR2336972A1
(en)

1977-07-29

AT357986B
(en)

1980-08-11

ES453887A1
(en)

1978-03-16

IT1067287B
(en)

1985-03-16

US4082698A
(en)

1978-04-04

NL7614499A
(en)

1977-07-05

ATA893676A
(en)

1980-01-15

JPS5285091A
(en)

1977-07-15

CA1068670A
(en)

1979-12-25

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