DE1145159B - Process for the preparation of 1,1,1,2,3,3,3-heptafluoropropane - Google Patents
Process for the preparation of 1,1,1,2,3,3,3-heptafluoropropaneInfo
- Publication number
- DE1145159B DE1145159B DEA37029A DEA0037029A DE1145159B DE 1145159 B DE1145159 B DE 1145159B DE A37029 A DEA37029 A DE A37029A DE A0037029 A DEA0037029 A DE A0037029A DE 1145159 B DE1145159 B DE 1145159B
- Authority
- DE
- Germany
- Prior art keywords
- reactor
- hexafluoropropene
- total
- contact time
- gas
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 13
- YFMFNYKEUDLDTL-UHFFFAOYSA-N 1,1,1,2,3,3,3-heptafluoropropane Chemical compound FC(F)(F)C(F)C(F)(F)F YFMFNYKEUDLDTL-UHFFFAOYSA-N 0.000 title description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 10
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical compound FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 claims description 8
- UKACHOXRXFQJFN-UHFFFAOYSA-N heptafluoropropane Chemical compound FC(F)C(F)(F)C(F)(F)F UKACHOXRXFQJFN-UHFFFAOYSA-N 0.000 claims description 7
- 239000003054 catalyst Substances 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- NSGXIBWMJZWTPY-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropane Chemical compound FC(F)(F)CC(F)(F)F NSGXIBWMJZWTPY-UHFFFAOYSA-N 0.000 claims description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 2
- 235000011089 carbon dioxide Nutrition 0.000 claims description 2
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 239000007858 starting material Substances 0.000 claims description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims 4
- 229910052731 fluorine Inorganic materials 0.000 claims 4
- 239000011737 fluorine Substances 0.000 claims 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 3
- 238000004458 analytical method Methods 0.000 claims 3
- 238000004821 distillation Methods 0.000 claims 3
- 229910052739 hydrogen Inorganic materials 0.000 claims 3
- 239000001257 hydrogen Substances 0.000 claims 3
- 238000013459 approach Methods 0.000 claims 2
- PBVZTJDHQVIHFR-UHFFFAOYSA-N 1,1,2,3,3,3-hexafluoroprop-1-ene Chemical compound FC(F)=C(F)C(F)(F)F.FC(F)=C(F)C(F)(F)F PBVZTJDHQVIHFR-UHFFFAOYSA-N 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 claims 1
- 238000000862 absorption spectrum Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 claims 1
- 238000004817 gas chromatography Methods 0.000 claims 1
- 230000001771 impaired effect Effects 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000010183 spectrum analysis Methods 0.000 claims 1
- 238000003809 water extraction Methods 0.000 claims 1
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- VJGCZWVJDRIHNC-UHFFFAOYSA-N 1-fluoroprop-1-ene Chemical compound CC=CF VJGCZWVJDRIHNC-UHFFFAOYSA-N 0.000 description 1
- 229910000792 Monel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/16—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances gases
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/07—Preparation of halogenated hydrocarbons by addition of hydrogen halides
- C07C17/087—Preparation of halogenated hydrocarbons by addition of hydrogen halides to unsaturated halogenated hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
-
- 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
- Y02P20/582—Recycling of unreacted starting or intermediate materials
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Description
DEUTSCHESGERMAN
PATENTAMTPATENT OFFICE
A 37029 IVb/12 οA 37029 IVb / 12 ο
BEKANNTMACHUNG
DER ANMELDUNG
UND AUSGABE DER
AUSLEGESCHRIFT: 14. MÄRZ 1963 NOTICE
THE REGISTRATION
AND ISSUE OF THE
EDITORIAL: MARCH 14, 1963
Die Erfindung betrifft ein Verfahren zur Herstellung von 1,1,1,2,3,3,3-HeptafluoTpropan,The invention relates to a method of manufacture of 1,1,1,2,3,3,3-heptafluoTpropane,
CF3CFHCF3,CF 3 CFHCF 3 ,
vom Kp. —17 bis —18,5° C (im folgenden einfach Heptafluorpropan genannt) durch direkte Hydrofluorierung von Hexafluorpropen,from bp -17 to -18.5 ° C (hereinafter simply Called heptafluoropropane) by direct hydrofluorination of hexafluoropropene,
CF3CF=CF2,CF 3 CF = CF 2 ,
Kp.-29° C. Heptafluorpropan ist wertvoi als Treibmittel und als gasförmiges Dielektrikum.Bp-29 ° C. Heptafluoropropane is valuable as a propellant and as a gaseous dielectric.
Aus der USA.-Reissne-Patentschrift 23425, Spalte 4, Zeilen 60 ff., ist es bekannt, Heptafluorpropan durch ein Verfahren herzustellen, bei dem Hexafluorpropan und wäßrige Flußsäure in einem Druckgefäß bei beträchtlichen überatmosphärischen Drükken umgesetzt werden. Die Nachteile des Arbeitens in einzelnen Absätzen, in flüssiger Phase und in einem Autoklav liegen auf der Hand.From U.S. Reissne Patent 23425, Column 4, lines 60 ff., It is known to produce heptafluoropropane by a process in which hexafluoropropane and aqueous hydrofluoric acid in a pressure vessel at substantial superatmospheric pressures implemented. The disadvantages of working in single paragraphs, in the liquid phase, and in an autoclave are obvious.
Es wurde gefunden, daß Aktivkohle die Um-Setzung von wasserfreiem Fluorwasserstoff und Hexafluorpropen in einem leicht steuerbaren, vollständig in der Gasphase bei 250 bis 4500C ablaufenden katalytischem Verfahren, bei dem Heptafluorpropan in hoher Ausbeute gebildet wird, fördert. Vom Standpunkt der Einfachheit des Betriebes ist es von besonderer Bedeutung, daß Aktivkohle die Umsetzung bei Atmosphärendruck fördert und keine extrem hohen Reaktionstemperaturen erforderlich sind.It has been found that activated carbon promotes the conversion of anhydrous hydrogen fluoride and hexafluoropropene in an easily controllable catalytic process which runs entirely in the gas phase at 250 to 450 ° C. and in which heptafluoropropane is formed in high yield. From the standpoint of simplicity of operation, it is particularly important that activated carbon promote the reaction at atmospheric pressure and that extremely high reaction temperatures are not required.
Hexafluorpropen und gasförmiger wasserfreier Fluorwasserstoff können kontinuierlich abgemessen,
vermischt und bei Atmosphärendruck in einen rohrförmigen Reaktor geleitet werden, der vorzugsweise
vollständig mit Aktivkohlekatalysator gefüllt ist und aus inertem Material, wie Nickel, Monel oder aus
mit Graphit oder Aluminiumoxyd ausgekleidetem Stahl, hergestellt und von einem geeigneten elektrischen
Ofen mit automatischer Heizung zwecks Einstellung der Reaktionstemperatur umgeben sein
kann. Die Gewinnung des Produktes kann durch die allgemein auf diesem Gebiet üblichen Maßnahmen
erfolgen. Beispielsweise können die aus der Reaktionszone austretenden Dämpfe durch einen Wäscher
mit Wasser geleitet werden, um Fluorwasserstoff abzutrennen, und die aus dem Wäscher austretenden
Dämpfe können getrocknet und durch geeignetes Kühlen, beispielsweise unter Verwendung eines Gemisches
von Trockeneis und Aceton in dem Aufnahmebehälter vollständig kondensiert werden. Das
erhaltene Kondensat kann dann fraktioniert destilliert werden, um das erwünschte Produkt zu gewin-Verfahren
zur Herstellung
von 1,1,1,2,3,3,3-HeptafluorpropanHexafluoropropene and gaseous anhydrous hydrogen fluoride can be continuously measured, mixed and passed at atmospheric pressure into a tubular reactor, which is preferably completely filled with activated carbon catalyst and made of inert material such as nickel, monel or of graphite or aluminum oxide lined steel and made of a suitable electric furnace with automatic heating for the purpose of adjusting the reaction temperature can be surrounded. The product can be obtained by the measures generally customary in this field. For example, the vapors emerging from the reaction zone can be passed through a washer with water to separate hydrogen fluoride, and the vapors emerging from the washer can be dried and completely condensed by suitable cooling, for example using a mixture of dry ice and acetone in the receiving vessel. The condensate obtained can then be fractionally distilled to obtain the desired product. Method of manufacture
of 1,1,1,2,3,3,3-heptafluoropropane
Anmelder:
Allied Chemical Corporation,Applicant:
Allied Chemical Corporation,
New York, N. Y. (V. St. A.)New York, N.Y. (V. St. A.)
Vertreter: DipL-Chem. Dr.rer.nat. I.Ruch,
Patentanwalt, München 5, Reichenbachstr. 47/49Representative: DipL-Chem. Dr.rer.nat. I. Ruch,
Patent attorney, Munich 5, Reichenbachstr. 47/49
Beanspruchte Priorität:
V. St. v. Amerika vom 22. März 1960 (Nr. 16 632)Claimed priority:
V. St. v. America, March 22, 1960 (No. 16,632)
Richard Francis Sweeney, Dover, N. J.,Richard Francis Sweeney, Dover, N.J.,
und Cyril Woolf, Morristown, N. J. (V. St. A.),and Cyril Woolf, Morristown, N.J. (V. St. A.),
sind als Erfinder genannt wordenhave been named as inventors
nen und möglicherweise geringe Mengen von nicht umgesetztem Ausgangsinaterial abzutrennen, die gewünschtenfals zurückgeleitet werden können.to separate and possibly small amounts of unreacted starting material, if desired can be returned.
Die für die praktische Durchführung des Verfahrens der Erfindung verwendbaren Aktivköhlekatalysatoren können granuläre, im Handel von verschiedenen Quellen erhältliche Materialien sein. Geeignet sind beispielsweise die verschiedenen erhältlichen Aktivkohlen mit einer Korngröße von 1,41 bis 2,38 mm. Die Korngröße ist nicht besonders kritisch. Gewöhnlich erfolgt die Umsetzung in langgestreckten rohrförmigen Reaktoren, und es ist dann erwünscht, Aktivkohlegranalien mit einer mittleren Korngröße zwischen einem Zwanzigstel und einem Viertel des Reaktorduirchmessers zu verwanden. Vorzugsweise ist der Reaktor im wesentlichen vollständig mit Granalien eilner mittleren Korngröße von etwa einem Achtel oder einem Zehntel seines Durchmessers gefüllt. The activated carbon catalysts useful in practicing the process of the invention can be granular materials commercially available from various sources. Suitable are for example the various available activated carbons with a grain size of 1.41 to 2.38 mm. The grain size is not particularly critical. Usually the implementation takes place in elongated form tubular reactors, and it is then desirable to use activated carbon granules with an average grain size to be used between a twentieth and a quarter of the reactor diameter. Preferably the reactor is essentially complete with granules having an average grain size of about one Eighth or one tenth of its diameter filled.
Die Erfahrung zeigt, daß die besten Ausbeuten erzielt werden, wenn Temperatur und Molverhältnis von Fluorwasserstoff zu Fluorpropen miteinander in Beziehung gesetzt werden. Die Umsetzung kann mit dem folgenden Reaktionsschema wiedergegeben werden:Experience shows that the best yields are obtained when the temperature and molar ratio of hydrogen fluoride to fluoropropene are in Relationship to be set. The reaction can be shown with the following reaction scheme will:
CF3CF = CF2 + HFCF 3 CF = CF 2 + HF
CF-CFHCF,CF-CFHCF,
Wenn die Umwandlung von Hexafluoipropen und die Verwertung des Fluorwasserstoffes je DurchsatzWhen the conversion of Hexafluoipropen and the utilization of the hydrogen fluoride per throughput
309 539/425309 539/425
Claims (3)
Wasserstoff vorzugsweise in größerer Menge alsare not of particular importance, fluorine can always be filled with catalyst. The total volume of less than theoretical hydrogen was about 0.541. The pressure used in the reactor system. For better performance it was about 0.14 atm, that is, it was sufficiently high, of the process, however, the Moü ratio of around the gas with the contact times indicated hydrogen fluoride to hexafluoropropene preferably 5 through the reactor system and the rest of the whole is essentially in the range from 1: 1 to 3: 1. To let the apparatus flow. Percentages when high yields are desired, fluorine will be based on weight.
Hydrogen preferably in an amount greater than
frischen Heizung, die etwa 76 cm seiner Länge einhüllte, geheizt wurde. Der Reaktor war an seinerEin- PATENTANSPRÜCHE :■
laßseite mit geeigneten Mitteln zur regulierten Ein- 60In Examples 1 and 2 the reactor consisted of 55,316 g (1.86 moles). The yield, based on a nickel tube with an internal diameter of 2.54 cm, was therefore essentially and! 104 cm length, which is 100%.
fresh heater, which enveloped about 76 cm of its length, was heated. The reactor was at its un- PATENT CLAIMS: ■
outlet side with suitable means for regulated inlet 60
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US1663260A | 1960-03-22 | 1960-03-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1145159B true DE1145159B (en) | 1963-03-14 |
Family
ID=21778140
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEA37029A Pending DE1145159B (en) | 1960-03-22 | 1961-03-22 | Process for the preparation of 1,1,1,2,3,3,3-heptafluoropropane |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1145159B (en) |
GB (1) | GB902590A (en) |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2712732C2 (en) * | 1977-03-23 | 1986-03-13 | Hoechst Ag, 6230 Frankfurt | Process for the production of octafluoropropane |
DE3905726A1 (en) * | 1989-02-24 | 1990-08-30 | Hoechst Ag | COMPRESSED GAS PACKING AND DRIVING AGENT FOR AEROSOLS |
AU629975B2 (en) * | 1989-08-21 | 1992-10-15 | Great Lakes Chemical Corporation | Fire extinguishing methods and blends utilizing hydrofluorocarbons |
DE4003270A1 (en) | 1990-02-03 | 1991-08-08 | Boehringer Ingelheim Kg | NEW SPEED GASES AND THEIR USE IN MEDICINE PREPARATIONS |
DE4003272A1 (en) | 1990-02-03 | 1991-08-08 | Boehringer Ingelheim Kg | NEW GAS MIXTURES AND THEIR USE IN MEDICINE PREPARATIONS |
US5059728A (en) * | 1990-06-29 | 1991-10-22 | Allied-Signal Inc. | Partially fluorinated alkanes having a tertiary structure |
US5087777A (en) * | 1990-12-04 | 1992-02-11 | Allied-Signal Inc. | Partially fluorinated alkenes having a tertiary structure |
DE4115025A1 (en) * | 1991-05-08 | 1992-11-12 | Hoechst Ag | METHOD FOR REMOVING OLEFINIC IMPURITIES FROM 1,1,1,2,3,3,3-HEPTAFLUORPROPANE |
DE59208629D1 (en) | 1991-11-01 | 1997-07-24 | Solvay | Process for the preparation of 1,1,1,2,3,3,3-heptafluoropropane (R 227) |
SG43283A1 (en) * | 1992-03-26 | 1997-10-17 | Solvay | Process for the reactivation of an activated charcoal catalyst employed in the preparation of 1,1,1,2,3,3,3,-heptafluoropropane (r 227) |
EP0634383B1 (en) * | 1993-07-12 | 1997-11-05 | SOLVAY (Société Anonyme) | Process for the addition of HF to halogenated alkenes |
DE4323054A1 (en) * | 1993-07-14 | 1995-01-19 | Hoechst Ag | Process for the preparation of 2-H-heptafluoropropane |
US5563304A (en) | 1994-05-26 | 1996-10-08 | E. I. Du Pont De Nemours And Company | Production of 1,2-dihydro and 2,2-dihydro hexafluoropropanes and azeotropes thereof with HF |
US5679287A (en) | 1995-04-28 | 1997-10-21 | Great Lakes Chemical Corporation | Uses of heptafluoropropane |
DE19617091A1 (en) * | 1996-04-29 | 1997-10-30 | Solvay | Process for the preparation of 2-H-heptafluoropropane |
US6407297B1 (en) | 1997-11-25 | 2002-06-18 | Ineos Fluor Holdings Limited | Preparation of fluorine-containing organic compounds |
US6281395B1 (en) | 1998-04-03 | 2001-08-28 | E. I. Du Pont De Nemours And Company | 1,1,1,2,3,3,3-heptafluoropropane manufacturing process |
US6018083A (en) * | 1998-04-03 | 2000-01-25 | E. I. Du Pont De Nemours And Company | Process for the production of fluorocarbons |
CN1178883C (en) | 1998-06-02 | 2004-12-08 | 纳幕尔杜邦公司 | Process for production of hexafluoropropene and optionally other halogenated hydrocarbons containing fluorine |
CA2333470C (en) | 1998-06-02 | 2008-08-26 | E.I. Du Pont De Nemours And Company | Process for the production of hexafluoropropylene from cc1f2cc1fcf3 and azeotropes of cclf2cc1fcf3 with hf |
EP1683778A3 (en) * | 1998-06-02 | 2008-03-19 | E.I.Du pont de nemours and company | Azeotropes of CCIF2CCIFCF3 with HF, and use thereof |
US6472574B2 (en) | 1999-12-10 | 2002-10-29 | E. I. Du Pont Nemours And Company | Production of 1,2-dihydro and 2,2-dihydro hexafluoropropanes and azeotropes thereof with HF |
US7375728B2 (en) | 2001-10-01 | 2008-05-20 | University Of Minnesota | Virtual mirror |
US7060165B2 (en) * | 2002-02-14 | 2006-06-13 | Pcbu Services, Inc. | Processes for purification and production of fluorocarbons |
DE60323994D1 (en) | 2002-08-22 | 2008-11-20 | Du Pont | PROCESS FOR PREPARING 2-CHLORO-1,1,1,2,3,3,3-HEPTAFLUORPROPAN, HEXAFLUORPROPEN AND 1,1,1,2,3,3,3-HEPTAFLUORPROPANE |
US7223351B2 (en) | 2003-04-17 | 2007-05-29 | Great Lakes Chemical Corporation | Fire extinguishing mixtures, methods and systems |
CA2539933A1 (en) | 2003-10-14 | 2005-04-28 | E.I. Du Pont De Nemours And Company | Process for the preparation of 1,1,1,3,3,3-hexafluoropropane and at least one of 1,1,1,2,3,3-hexafluoropropane and 1,1,1,2,3,3,3-heptafluoropropane |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US23425A (en) * | 1859-03-29 | Machine for rolling iron |
-
1961
- 1961-03-09 GB GB8744/61A patent/GB902590A/en not_active Expired
- 1961-03-22 DE DEA37029A patent/DE1145159B/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US23425A (en) * | 1859-03-29 | Machine for rolling iron |
Also Published As
Publication number | Publication date |
---|---|
GB902590A (en) | 1962-08-01 |
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