WO2022191185A1 - 1,1,2-トリフルオロエタンの製造方法 - Google Patents
1,1,2-トリフルオロエタンの製造方法 Download PDFInfo
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- WO2022191185A1 WO2022191185A1 PCT/JP2022/010001 JP2022010001W WO2022191185A1 WO 2022191185 A1 WO2022191185 A1 WO 2022191185A1 JP 2022010001 W JP2022010001 W JP 2022010001W WO 2022191185 A1 WO2022191185 A1 WO 2022191185A1
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- WGZYQOSEVSXDNI-UHFFFAOYSA-N 1,1,2-trifluoroethane Chemical compound FCC(F)F WGZYQOSEVSXDNI-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title abstract description 16
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 16
- MIZLGWKEZAPEFJ-UHFFFAOYSA-N 1,1,2-trifluoroethene Chemical group FC=C(F)F MIZLGWKEZAPEFJ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000006722 reduction reaction Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims description 31
- WFLOTYSKFUPZQB-OWOJBTEDSA-N (e)-1,2-difluoroethene Chemical group F\C=C\F WFLOTYSKFUPZQB-OWOJBTEDSA-N 0.000 claims description 12
- 239000001257 hydrogen Substances 0.000 claims description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 9
- 239000003054 catalyst Substances 0.000 abstract description 39
- 238000006243 chemical reaction Methods 0.000 description 35
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 14
- 229910000423 chromium oxide Inorganic materials 0.000 description 14
- 239000007789 gas Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 5
- 238000006317 isomerization reaction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 3
- -1 N-heterocyclic carbene boranes Chemical class 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- UUAGAQFQZIEFAH-UHFFFAOYSA-N chlorotrifluoroethylene Chemical group FC(F)=C(F)Cl UUAGAQFQZIEFAH-UHFFFAOYSA-N 0.000 description 3
- 238000005796 dehydrofluorination reaction Methods 0.000 description 3
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- UHTBGZCYOATXPS-UHFFFAOYSA-M aluminum;oxygen(2-);fluoride Chemical compound [O-2].[F-].[Al+3] UHTBGZCYOATXPS-UHFFFAOYSA-M 0.000 description 2
- UOUJSJZBMCDAEU-UHFFFAOYSA-N chromium(3+);oxygen(2-) Chemical class [O-2].[O-2].[O-2].[Cr+3].[Cr+3] UOUJSJZBMCDAEU-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003682 fluorination reaction Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 239000000543 intermediate Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 229910001512 metal fluoride Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- AQRLNPVMDITEJU-UHFFFAOYSA-N triethylsilane Chemical compound CC[SiH](CC)CC AQRLNPVMDITEJU-UHFFFAOYSA-N 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- DYLIWHYUXAJDOJ-OWOJBTEDSA-N (e)-4-(6-aminopurin-9-yl)but-2-en-1-ol Chemical compound NC1=NC=NC2=C1N=CN2C\C=C\CO DYLIWHYUXAJDOJ-OWOJBTEDSA-N 0.000 description 1
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 description 1
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 description 1
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical group [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910018287 SbF 5 Inorganic materials 0.000 description 1
- 239000004280 Sodium formate Substances 0.000 description 1
- 229910004529 TaF 5 Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- VZTDIZULWFCMLS-UHFFFAOYSA-N ammonium formate Chemical compound [NH4+].[O-]C=O VZTDIZULWFCMLS-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000085 borane Inorganic materials 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- XKKQWEPXPQZMNH-UHFFFAOYSA-M chromium(3+);oxygen(2-);fluoride Chemical compound [O-2].[F-].[Cr+3] XKKQWEPXPQZMNH-UHFFFAOYSA-M 0.000 description 1
- 230000000779 depleting effect Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 150000002391 heterocyclic compounds Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 125000001841 imino group Chemical group [H]N=* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- GTLACDSXYULKMZ-UHFFFAOYSA-N pentafluoroethane Chemical compound FC(F)C(F)(F)F GTLACDSXYULKMZ-UHFFFAOYSA-N 0.000 description 1
- 239000003504 photosensitizing agent Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001843 polymethylhydrosiloxane Polymers 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 description 1
- 235000019254 sodium formate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- PTMFUWGXPRYYMC-UHFFFAOYSA-N triethylazanium;formate Chemical compound OC=O.CCN(CC)CC PTMFUWGXPRYYMC-UHFFFAOYSA-N 0.000 description 1
- UHUUYVZLXJHWDV-UHFFFAOYSA-N trimethyl(methylsilyloxy)silane Chemical compound C[SiH2]O[Si](C)(C)C UHUUYVZLXJHWDV-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/35—Preparation of halogenated hydrocarbons by reactions not affecting the number of carbon or of halogen atoms in the reaction
- C07C17/354—Preparation of halogenated hydrocarbons by reactions not affecting the number of carbon or of halogen atoms in the reaction by hydrogenation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/25—Preparation of halogenated hydrocarbons by splitting-off hydrogen halides from halogenated hydrocarbons
Definitions
- the present disclosure relates to methods for producing 1,1,2-trifluoroethane (HFC-143) and 1,2-difluoroethylene (HFO-1132).
- HFC-134a C 2 H 2 F 4
- HFC-125 C 2 HF 5
- HFC-32 CH 2 F 2
- HFC-32 and HFC- in place of ozone depleting CFCs or HCFCs 125 mixed refrigerant R410A is used.
- R410A has a global warming potential (GWP) of 2088, and due to growing concerns about global warming, various low-GWP refrigerants that can be substituted for R410A are being investigated.
- GWP global warming potential
- Patent Document 1 discloses CH 2 FX (here, and X is Cl or F).
- Patent Document 2 discloses a method for obtaining HFO-1132 by producing HFC-142 or HFC-143 using haloethane or haloethylene, followed by dehydrofluorination.
- the purpose of the present disclosure is to provide an efficient method for producing HFC-143 or HFO-1132.
- Section 1 A method for producing HFC-143, comprising a step of reducing 1,1,2-trifluoroethylene with a reducing agent to obtain 1,1,2-trifluoroethane (HFC-143).
- Section 2. Item 1. The production method according to Item 1, wherein the reduction reaction is performed at 100 to 500°C.
- Item 3. Item 3.
- Section 4. Manufacture of HFO-1132, comprising a step of obtaining 1,2-difluoroethylene (HFO-1132) by dehydrofluorinating HFC-143 obtained by the manufacturing method according to any one of Items 1 to 3. Method.
- HFC-143 can be efficiently obtained, and HFO-1132 can be efficiently obtained by using the production method.
- the method for producing HFC-143 of the present disclosure includes the step of reducing 1,1,2-trifluoroethylene with a reducing agent to obtain HFC-143.
- CTFE chlorotrifluoroethylene
- any of inorganic and organic reducing agents may be used, and specific examples include hydrogen, formic acid, ammonium formate, sodium formate, formic acid-triethylamine, triethylsilane, and tetramethyldisiloxane. , polymethylhydrosiloxane, NaBH 3 CN, NHCBH 3 (N-heterocyclic carbene boranes), or a nitrogen-containing unsaturated heterocyclic compound having an NH portion (imino group).
- hydrogen, hydrogen sulfide, carbon monoxide, methane, or the like can be used as the reducing agent used when carrying out the gas phase reduction reaction in the presence of a catalyst, and it is particularly preferable to use hydrogen.
- the amount of hydrogen used is preferably 0.5 to 20 mol, more preferably 1.0 to 10 mol, per 1 mol of 1,1,2-trifluoroethylene.
- another reducing agent is used, it is preferably 0.5 to 30 mol, more preferably 1.0 to 20 mol, per 1 mol of 1,1,2-trifluoroethylene.
- the method for producing HFC-143 of the present disclosure preferably uses a catalyst.
- a wide range of known reduction catalysts can be used as the catalyst, and there is no particular limitation. Specifically, those supported on metals such as Pd, Pt, Rh, Ru, or Re, metal oxides such as activated carbon or alumina, or metal fluorides can be exemplified.
- As a reduction reaction mechanism using a catalyst a mechanism of activating hydrogen atoms on a metal surface and reacting with an organic substance is known. Therefore, metals having such effects can be widely used. Among them, it is preferable to use Pd or Pt.
- the metal loading ratio is preferably 0.1 to 20% by mass, more preferably 0.1 to 10% by mass, and more preferably 0.5 to 5% by mass. More preferred.
- the method for producing HFC-143 of the present disclosure is preferably carried out in the gas phase in the presence of a catalyst. This is because performing the reaction in the gas phase has advantages over the liquid phase reaction in terms of recovery of products and unreacted raw materials, and separation of the catalyst and the product.
- the reaction temperature is preferably in the range of 100-500°C, more preferably 120-400°C, even more preferably 150-300°C.
- the pressure during the reaction is not particularly limited, and the reaction can proceed under reduced pressure, normal pressure, or increased pressure. Above all, 0.1 is recommended for the reasons of reducing the loss of 1,1,2-trifluoroethane, which is a raw material and product such as hydrogen and 1,1,2-trifluoroethylene, and reducing the operating energy in the subsequent separation process. It is preferred to carry out the reaction under pressures in the range of ⁇ 2 MPaG.
- W/F0 is preferably 0.1 to 60, preferably 1 to 50, where W is the weight of the catalyst and F0 is the raw material supply flow rate (F0 is the flow rate at 0 ° C. and 0.1013 MPa). is more preferable.
- Method for producing HFO-1132 The present disclosure relates to a method for producing HFO-1132, which includes a step of obtaining HFO-1132 by dehydrofluorinating HFC-143 obtained by the method for producing HFC-143 described above.
- a method for producing HFO-1132 which includes a step of obtaining HFO-1132 by dehydrofluorinating HFC-143 obtained by the method for producing HFC-143 described above.
- 1,1,2-trifluoroethylene is reacted with a reducing agent to obtain HFC-143 in step (a), and in step (a)
- It can be a method for producing HFO-1132, comprising the step (b) of obtaining HFO-1132 by dehydrofluorinating the obtained HFC-143.
- step (a) Step (a) reacts 1,1,2-trifluoroethylene with a reducing agent in the presence of a catalyst to obtain HFC-143.
- the step (a) can be carried out according to the method for producing HFC-143 described above.
- step (b) HFO-1132 is obtained by dehydrofluorinating HFC-143 obtained in step (a).
- a dehydrofluorination catalyst in step (b).
- a known catalyst active against the fluorination reaction with hydrogen fluoride can be used.
- metal oxides and metal oxide fluorides such as chromium oxide, chromium oxide fluoride, aluminum fluoride, and aluminum oxide fluoride can be used.
- metal fluorides such as MgF 2 , TaF 5 and SbF 5 can be used. can also be used.
- chromium oxide is not particularly limited, but it is preferable to use a composition formula: CrO m in which m is in the range of 1.5 ⁇ m ⁇ 3.
- the shape of the chromium oxide catalyst may be powder, pellets, or any other shape suitable for the reaction, with pellets being preferred.
- Oxygen is preferably supplied to the reactor together with HFC-143.
- the amount of oxygen supplied is preferably 0.5 to 20 mol, more preferably 1 to 10 mol, per 1 mol of HFC-143. By setting the value within this numerical range, it is possible to obtain the effect of suppressing deterioration of the catalyst and stably conducting the reaction.
- the reaction temperature in step (b) is preferably 300 to 500°C, more preferably 350 to 450°C, as the temperature in the reactor. A high yield can be ensured by setting the reaction temperature to these sufficiently high temperatures. Also, by setting the reaction temperature below these excessive temperatures, it is possible to suppress the generation of impurities and prevent irreversible deterioration of the catalyst due to structural changes of the catalyst.
- the pressure at which HFC-143 can exist in a gaseous state it is preferable to set the pressure at which HFC-143 can exist in a gaseous state, and it may be under normal pressure or under pressure. Specifically, it is preferably carried out under a pressure condition of 0 to 1 MPaG, more preferably 0.05 MPaG to 0.7 MPaG.
- the reaction time is not particularly limited, and the ratio between the catalyst filling amount W (g) and the flow rate Fo of the raw material gas flowing into the reaction system (flow rate at 0 ° C. and atmospheric pressure 0.1013 MPa: cc / sec): W /
- the contact time represented by Fo should be in the range of about 10 to 100 g ⁇ sec/cc, preferably in the range of about 20 to 60 g ⁇ sec/cc.
- HFO-1132 obtained through step (b) contains both cis-HFO-1132(Z) and trans-HFO-1132(E).
- HFO-1132(E) By appropriately setting the reaction conditions, it is possible to obtain HFO-1132(E) with a high selectivity of 1 to 30% by mass, preferably 5 to 20% by mass in the total amount of HFO-1132.
- step (c) HFO-1132 obtained in step (b) includes HFO-1132(E) and HFO-1132(Z).
- the process (c ) is also preferably provided after step (b).
- chromium oxide As the catalyst used for the isomerization reaction in step (c), it is preferable to use a catalyst containing chromium atoms, and chromium oxide is particularly preferable.
- chromium oxide include crystalline chromium oxide and amorphous chromium oxide.
- the chromium oxide is not particularly limited. Certain chromium oxides are preferred.
- the chromium oxide catalyst can be used in any form such as powder and pellets as long as it is suitable for the reaction. It is also particularly preferred to use a fluorinated chromium oxide catalyst.
- Chromium oxide is preferably pretreated with anhydrous hydrogen fluoride. As a method of pretreatment with chromium oxide as a precursor and anhydrous hydrogen fluoride, for example, the method described in Japanese Patent Laid-Open No. 5-146680 (corresponding US Pat. No. 6,337,299) can be used.
- the reaction temperature is not particularly limited and can be set as appropriate. Specifically, it is preferably in the range of about 180°C to 500°C, more preferably in the range of about 200°C to 400°C.
- the reaction time is not particularly limited and can be set as appropriate. If the contact time is lengthened, the conversion rate can be increased. Usually, the ratio of the catalyst filling amount W (g) and the flow rate Fo (flow rate at 0 ° C. and 1 atmospheric pressure: cc/sec) of the raw material gas flowing into the reaction system:
- the contact time represented by W/Fo is 10. It may be about 80 g ⁇ sec/cc, preferably about 20 to 60 g ⁇ sec/cc.
- the pressure of the reactor is not particularly limited and can be set as appropriate, but since high pressure promotes the formation of polymers such as tar, an appropriate pressure can be set. Normally, the range is 0 to 1 MPaG, preferably 0 to 0.5 MPaG.
- step (a) 1,1,2-trifluoroethylene and a reducing agent are reacted to obtain HFC-143.
- the target product in this process is HFC-143, and other intermediates are recycled to the reactor.
- HFC-143 is dehydrohalogenated to obtain HFO-1132.
- the catalyst aluminum oxide, chromium oxide, or fluorinated aluminum oxide fluoride, fluorochromium oxide catalyst, or the like can be used.
- the fluorochromium oxide catalyst can be prepared by the methods exemplified above.
- step (b) 1,2-difluoroethylene (Z), which is a cis-trans isomer, is produced in addition to trans-1,2-difluoroethylene.
- step (c) 1,2-difluoroethylene (E) can be obtained by subjecting a composition containing both isomers to an isomerization reaction.
- the isomerization reaction can be carried out in the presence or absence of a catalyst. It can also be carried out by a photoreaction in which light having a wavelength in the region from ultraviolet to vacuum ultraviolet is irradiated, and in some cases it can be carried out in the presence of a photosensitizer. These reactions can be carried out in either gas phase or liquid phase.
- the components that can be used as reaction raw materials are preferably separated in the subsequent distillation step and then recycled to the reaction step. .
- Example 1 Production of HFC-143 from 1,1,2-trifluoroethylene/process
- a 1 kg of an activated carbon catalyst supporting 1.5% by mass of Pd was packed in a SUS304 reaction tube with an inner diameter of 50 mm, and dried by purging nitrogen at 200° C. for 3 hours.
- Example 2 Production/process of HFO-1132 from HFC-143
- 10 g of a catalyst obtained by fluorinating chromium oxide represented by the composition formula: CrO 2 (fluorine content: about 15.0% by mass) was placed in a tubular Hastelloy reaction tube with an inner diameter of 15 mm and a length of 1 m. filled the vessel.
- the reaction tube was maintained at 400° C. under atmospheric pressure (0.1013 MPa) and HFC-143 was supplied at a flow rate of 15.0 Nml/min.
- the contact time W/Fo was 40.0 g ⁇ sec/Nml.
- Example 3 Isomerization reaction/step (c) A reactor having an outer diameter of 12.7 mm and a length of 700 mm was filled with 10 g of a catalyst obtained by fluorinating chromium oxide represented by CrO 2 similar to that used in Example 2, and the isomerization reaction was carried out. gone. 1,2-difluoroethylene (Z) with added nitrogen and oxygen to prevent deterioration of the catalyst is supplied to the reactor at a rate of 6 to 10 Nml/min. reaction was carried out. The results of the reaction are shown in Table 1.
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Abstract
Description
項1.
1,1,2-トリフルオロエチレンを還元剤と還元反応させて1,1,2-トリフルオロエタン(HFC-143)を得る工程を含む、HFC-143の製造方法。
項2.
前記還元反応は100~500℃で実施される、項1に記載の製造方法。
項3.
前記還元剤は水素を含む、項1又は2に記載の製造方法。
項4.
項1~3の何れかに記載の製造方法により得られたHFC-143を脱フッ化水素化することにより1,2-ジフルオロエチレン(HFO-1132)を得る工程を含む、HFO-1132の製造方法。
本開示のHFC-143の製造方法は、1,1,2-トリフルオロエチレンを、還元剤と還元反応させてHFC-143を得る工程を含む。
本開示は、上述のHFC-143の製造方法により得られるHFC-143を脱フッ化水素化することによりHFO-1132を得る工程を含むHFO-1132の製造方法に関する発明を含む。当該発明においては、例えば、下記反応式1に示すとおり、1,1,2-トリフルオロエチレンと還元剤とを反応させて、HFC-143を得る工程(a)、及び該工程(a)で得られるHFC-143を脱フッ化水素することによりHFO-1132を得る工程(b)を含む、HFO-1132の製造方法とすることができる。
工程(a)は、1,1,2-トリフルオロエチレンと還元剤とを触媒の存在下で反応させてHFC-143を得る。工程(a)については、既述のHFC-143の製造方法に基づき、実施することができる。
工程(b)では、工程(a)で得られたHFC-143を脱フッ化水素化することによりHFO-1132を得る。
工程(b)で得られるHFO-1132は、HFO-1132(E)及びHFO-1132(Z)を含む。HFO-1132(E)及びHFO-1132(Z)を含む混合物からHFO-1132(E)のみを得るため、或いはHFO-1132(E)の含有率を高めるための異性化工程としての工程(c)を、工程(b)の次に設けることも好ましい。
1,1,2-トリフルオロエチレンからHFC-143の製造/工程(a)
Pdを1.5質量%担持した活性炭触媒を、1kg、内径50mmのSUS304製反応管に充填し、200℃、3時間窒素パージにより乾燥した。その後、1,1,2-トリフルオロエチレンを300Nml/min、及び水素を1000Nml/min(Nml/min とは、0℃、大気圧0.1013MPaでのガス流量を示す。)で供給し、反応温度200℃、接触時間(W/F0)=20、反応圧力0.1MPaGにて還元反応を行った。出口ガスを水洗後、塩化カルシウムで乾燥したのちGS-GASPROキャピラリーカラム(0.32mm×60m)を装備したGC(島津製 GC-2030)により分析した。反応温度ごとの1,1,2-トリフルオロエチレン転化率とHFC-143選択率を以下の表1に示す。
HFC-143からHFO-1132の製造/工程(b)
フッ素化触媒として、組成式:CrO2で表される酸化クロムにフッ素化処理を施して得られた触媒10g(フッ素含有量約15.0質量%)を、内径15mm、長さ1mの管状ハステロイ製反応器に充填した。この反応管を大気圧(0.1013MPa)下で400℃に維持し、HFC-143を15.0Nml/minの流速で供給した。接触時間W/Foは40.0 g・sec/Nmlであった。反応開始4時間後、HFC-143の転化率は98%、HFO-1132の選択率は89%であった。HFO-1132の2種類の異性体、1,2-ジフルオロエチレン(E)と1,2-ジフルオロエチレン(Z)のモル比率(1,2-ジフルオロエチレン(E)/1,2-ジフルオロエチレン(Z))は、19/81であった。
異性化反応/工程(c)
実施例2で使用したものと同様のCrO2で表される酸化クロムにフッ素化処理を施して得られた触媒を外径12.7mm、長さ700mmの反応器に10g充填し、異性化反応を行った。1,2-ジフルオロエチレン(Z)に、触媒の劣化防止のために窒素、酸素を添加した原料ガスを6~10Nml/minの速度で反応器に供給し、反応温度250~300℃、で異性化反応を行った。反応の結果を表1に示す。
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