WO2024253097A1 - フルオロモノマーの製造方法 - Google Patents
フルオロモノマーの製造方法 Download PDFInfo
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- WO2024253097A1 WO2024253097A1 PCT/JP2024/020390 JP2024020390W WO2024253097A1 WO 2024253097 A1 WO2024253097 A1 WO 2024253097A1 JP 2024020390 W JP2024020390 W JP 2024020390W WO 2024253097 A1 WO2024253097 A1 WO 2024253097A1
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- fluoropolymer
- fluoromonomer
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- organic sulfur
- sulfur compound
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/361—Preparation of halogenated hydrocarbons by reactions involving a decrease in the number of carbon atoms
- C07C17/367—Preparation of halogenated hydrocarbons by reactions involving a decrease in the number of carbon atoms by depolymerisation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
- C08J11/18—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material
- C08J11/28—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic compounds containing nitrogen, sulfur or phosphorus
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
Definitions
- the present invention relates to a method for producing a fluoromonomer.
- Patent Document 1 discloses a method for obtaining fluoroolefins by pyrolyzing a fluoropolymer in the presence of steam using a rotary kiln.
- a fluoromonomer from a fluoropolymer it is desired to further improve the rate at which the fluoropolymer is converted into a fluoromonomer (that is, the conversion rate).
- the present inventors produced a fluoromonomer from a fluoropolymer by the method described in Patent Document 1, and found that there was room for improvement in the conversion rate of the fluoropolymer.
- the present invention was made in consideration of the above problems, and aims to provide a method for producing a fluoromonomer with an excellent conversion rate to a fluoropolymer.
- a method for producing a fluoromonomer comprising heating a fluoropolymer in the presence of an organic sulfur compound to thermally decompose the fluoropolymer to obtain a fluoromonomer.
- the organic sulfur compound comprises at least one selected from the group consisting of polyphenylene sulfide, polyether sulfone, and polysulfone.
- [3] The method for producing a fluoromonomer according to [1] or [2], wherein the fluoropolymer comprises at least one selected from the group consisting of polytetrafluoroethylene, tetrafluoroethylene copolymers, polychlorotrifluoroethylene, polyvinylidene fluoride, polyvinyl fluoride, vinylidene fluoride-hexafluoropropylene copolymers, and perfluoropolyether rubbers.
- [4] The method for producing a fluoromonomer according to any one of [1] to [3], wherein the amount of the organic sulfur compound used is 2 to 300 parts by mass per 100 parts by mass of the fluoropolymer used.
- the present invention provides a method for producing a fluoromonomer with excellent conversion rate to a fluoropolymer.
- FIG. 1 is a schematic side view showing an example of a thermal decomposition apparatus used in the method for producing a fluoromonomer of the present invention.
- a numerical range expressed using “to” means a range that includes the numerical values before and after “to” as the lower and upper limits.
- the term “unit” refers collectively to an atomic group derived from one molecule of a monomer that is formed directly by polymerization of the monomer, and an atomic group obtained by chemically converting a part of the atomic group.
- a "unit based on a monomer” will also be simply referred to as a "unit”.
- the method for producing a fluoromonomer of the present invention (hereinafter also referred to as the present production method) is a method for obtaining a fluoromonomer by heating a fluoropolymer in the presence of an organic sulfur compound and pyrolyzing the fluoropolymer.
- the present production method is suitable for recycling the fluoropolymer. According to the present production method, the conversion rate of the fluoropolymer is excellent.
- the fluorine-containing polymer is not particularly limited as long as it is a polymer containing fluorine atoms, and may be a resin or a rubber.
- the fluoropolymer may be one obtained from waste materials containing a fluoropolymer.
- the fluoropolymer preferably contains at least one selected from the group consisting of polytetrafluoroethylene (hereinafter also referred to as "PTFE”), tetrafluoroethylene copolymer, polychlorotrifluoroethylene (hereinafter also referred to as "PCTFE”), polyvinylidene fluoride (hereinafter also referred to as "PVdF”), polyvinyl fluoride (hereinafter also referred to as "PVF”), vinylidene fluoride-hexafluoropropylene copolymer (hereinafter also referred to as "FKM”), and perfluoropolyether rubber.
- PTFE polytetrafluoroethylene
- PCTFE polychlorotrifluoroethylene
- PVdF polyvinylidene fluoride
- PVdF polyvinyl fluoride
- FKM vinylidene fluoride-hexafluoropropylene copolymer
- FKM vinyli
- tetrafluoroethylene copolymers include tetrafluoroethylene-ethylene copolymer (hereinafter also referred to as "ETFE”), tetrafluoroethylene-hexafluoropropylene copolymer (hereinafter also referred to as "FEP”), tetrafluoroethylene-propylene copolymer (hereinafter also referred to as "FEPM”), and tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer.
- ETFE tetrafluoroethylene-ethylene copolymer
- FEP tetrafluoroethylene-hexafluoropropylene copolymer
- FEPM tetrafluoroethylene-propylene copolymer
- tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer.
- tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer a copolymer in which the ratio of tetrafluoroethylene units (hereinafter also referred to as "TFE units”) and perfluoroalkyl vinyl ether units (hereinafter also referred to as "PAVE units”) to the total of PAVE units is 0.1 mol % or more and less than 20 mol % (hereinafter also referred to as "PFA”), and a copolymer in which the ratio of PAVE units is 20 to 70 mol % (hereinafter also referred to as "FFKM”) are preferred.
- TFE units tetrafluoroethylene units
- PAVE units perfluoroalkyl vinyl ether units
- PFA may be a copolymer consisting of only TFE units and PAVE units, or may contain one or more units based on other monomers other than these.
- other monomers include other fluorine monomers (e.g., hexafluoropropylene) and monomers having an oxygen-containing polar group (e.g., 5-norbornene-2,3-dicarboxylic anhydride).
- FFKM may be a copolymer consisting of only TFE units and PAVE units, or may contain one or more units based on other monomers other than these.
- Specific examples of other monomers include units based on a monomer having a fluorine atom and a nitrile group, and units based on a monomer having a fluorine atom and multiple vinyl groups.
- the form of the fluoropolymer is not particularly limited, but is preferably in the form of a sheet or granules in order to further improve the pyrolysis efficiency.
- the size of the fluoropolymer is preferably 1 to 10 mm, more preferably 2 to 5 mm, in order to further improve the effects of the present invention.
- the size of the fluoropolymer means the thickness when the fluoropolymer is in the form of a sheet, and means the average particle size based on a sieve when the fluoropolymer is in the form of granules. The thickness can be measured with a thickness gauge or the like, and the particle size can be measured with a sieve having various openings.
- the fluoropolymer may be previously subjected to a pulverization treatment, cutting treatment or the like so as to have the above-mentioned size.
- the organic sulfur compound is an organic compound containing a sulfur atom, and may be a polymeric compound or a low molecular weight compound, but is preferably a polymeric compound. From the viewpoint of obtaining superior effects of the present invention, the organic sulfur compound preferably contains at least one selected from the group consisting of polyphenylene sulfide (hereinafter also referred to as "PPS"), polyethersulfone (hereinafter also referred to as "PES”), and polysulfone (hereinafter also referred to as "PS”), and more preferably contains PPS.
- PPS polyphenylene sulfide
- PS polyethersulfone
- the organic sulfur compound may be used alone or in combination of two or more kinds.
- PPS polymer obtained by thermal polycondensation of p-dichlorobenzene and Na 2 S.
- PES is a polymer obtained by polycondensation of dihalogenodiphenylsulfone and bisphenol S.
- PS is a polymer obtained by polycondensation of bisphenol A and 4,4'-dichlorodiphenyl sulfone.
- the form of the organic sulfur compound is not particularly limited, but is preferably sheet-like or granular in terms of further improving the thermal decomposition efficiency.
- the size of the organic sulfur compound is preferably 1 to 10 mm, more preferably 2 to 5 mm, in terms of more excellent effects of the present invention.
- the size of the organic sulfur compound means the thickness when the organic sulfur compound is sheet-like, and means the average particle size based on a sieve when the organic sulfur compound is granular. The thickness can be measured with a thickness gauge or the like, and the particle size can be measured with a sieve having various openings.
- the organic sulfur compound may be previously subjected to a pulverization treatment, a cutting treatment, or the like so as to have the above-mentioned size.
- the amount of the organic sulfur compound used is preferably from 2 to 300 parts by mass, more preferably from 3 to 140 parts by mass, and even more preferably from 5 to 70 parts by mass, per 100 parts by mass of the fluoropolymer used.
- the amount of the organic sulfur compound used is 2 parts by mass or more, the effect of the present invention is more excellent.
- the amount of the organic sulfur compound used is 300 parts by mass or less, the efficiency of thermal decomposition of the fluoropolymer relative to the amount of heat applied is good.
- the fluoropolymer is heated in the presence of an organosulfur compound to thermally decompose the fluoropolymer.
- the heating temperature of the fluoropolymer is preferably 300° C. or higher, more preferably 350° C. or higher, and even more preferably 400° C. or higher, from the viewpoint of improving the efficiency of thermal decomposition of the fluoropolymer.
- the heating temperature of the fluoropolymer is preferably lower in view of the design temperature of the equipment, and specifically, it is preferably 800° C. or lower, more preferably 700° C. or lower, and even more preferably 600° C. or lower.
- the pyrolysis of the fluoropolymer can be carried out by using a known heating device, but it is preferably carried out by using a rotary kiln in view of the superior effect of the present invention.
- the rotary kiln is a rotary furnace, and in this production method, for example, the apparatus described in Japanese Patent No. 4,010,300 or the apparatus described in Japanese Patent No. 4,357,999 can be used.
- FIG. 1 is a schematic side view showing an example of a pyrolysis apparatus that can be used in the present production method, and shows a part of its internal structure.
- the pyrolysis device 1 has a hopper 10 capable of storing raw materials (such as a fluoropolymer and an organic sulfur compound), a cylindrical rotary kiln 20 into which the raw materials are supplied, and a recovery container 30 connected to the rotary kiln 20 for recovering pyrolysis products of the raw materials (such as a fluoromonomer) and residues.
- raw materials such as a fluoropolymer and an organic sulfur compound
- a recovery container 30 connected to the rotary kiln 20 for recovering pyrolysis products of the raw materials (such as a fluoromonomer) and residues.
- the rotary kiln 20 has a rotating means (not shown) for rotating the rotary kiln 20, and a heating means (not shown) for heating the raw materials supplied inside the rotary kiln 20.
- a stirring means may be provided inside the rotary kiln 20 to improve the efficiency of pyrolysis of the raw materials.
- the material constituting the inner wall surface of the rotary kiln 20 is not particularly limited, but preferably contains at least one selected from the group consisting of stainless steel, nickel, and chromium, and may be an alloy of these materials.
- the raw materials supplied to and temporarily stored inside the hopper 10 are transported by a conveyor 12 provided at a position adjacent to the hopper 10, and are supplied to the inside of the rotary kiln 20 via a feed chute 14 connected to the rotary kiln 20.
- steam preferably superheated steam
- the steam supplied into the charging chute is blown into the rotary kiln 20 through the charging chute.
- FIG. 1 an example in which the steam supply pipe 16 is connected to the charging chute 14 is shown, but the present invention is not limited to this, and the steam supply pipe 16 may be directly connected to the rotary kiln 20.
- the raw materials supplied to the inside of the rotary kiln 20 are heated by the heating means and stirred by the rotation of the rotary kiln 20.
- the raw materials are pyrolyzed inside the rotary kiln 20, and the pyrolyzed products of the raw materials are sent to a recovery container 30.
- the gas components of the pyrolyzed products of the raw materials are recovered via a gas recovery pipe 32, and the solid components of the pyrolyzed products of the raw materials are recovered from inside the recovery container 30.
- the hopper 10 may be charged with a solid material containing a fluoropolymer (e.g., pellets, particles, sheets, etc.) and a solid material containing an organic sulfur compound separately, or a solid material containing both a fluoropolymer and an organic sulfur compound.
- a fluoropolymer e.g., pellets, particles, sheets, etc.
- a solid material containing an organic sulfur compound separately, or a solid material containing both a fluoropolymer and an organic sulfur compound.
- fluoromonomers obtainable by this production method include tetrafluoroethylene (hereinafter also referred to as "TFE”), hexafluoropropylene (hereinafter also referred to as "HFP”), octafluorocyclobutane (hereinafter also referred to as “c-318"), vinylidene fluoride, vinyl fluoride, chlorotrifluoroethylene, perfluoroalkyl vinyl ether, and mixtures of two or more of these.
- TFE tetrafluoroethylene
- HFP hexafluoropropylene
- c-318 octafluorocyclobutane
- vinylidene fluoride vinyl fluoride
- chlorotrifluoroethylene perfluoroalkyl vinyl ether
- Example 1 to 4 are working examples
- Example 5 is a comparative example.
- the present invention is not limited to these examples.
- PTFE polytetrafluoroethylene
- PPS polyphenylene sulfide
- PS polysulfone
- Example 1 The inside of the rotary kiln of the pyrolysis device was heated to 600° C. Then, 18 g/h of PPS, 300 g/h of PTFE, and 1000 g/h of steam were supplied to the inside of the rotary kiln to pyrolyze PTFE. The rotation speed of the rotary kiln during pyrolysis was 5 rpm. After the operation was continued for 2 hours, the amount of solid matter recovered from the rotary kiln and the recovery vessel was weighed, and the conversion rate of PTFE was calculated from the input amount. The results are shown in Table 1. In addition, when the gas generated during the operation was measured by gas chromatography, TFE, HFP, and c-318 were detected. The selectivity of each component is shown in Table 1.
- Example 2 Pyrolysis of PTFE was carried out in the same manner as in Example 1, except that the amount of PPS fed to the rotary kiln was changed to the value in Table 1.
- the PTFE conversion rate and the analysis results of the gas evolved during the operation are shown in Table 1.
- Example 4 Pyrolysis of PTFE was carried out in the same manner as in Example 2, except that PPS was changed to PS.
- the PTFE conversion rate and the analysis results of the gas evolved during the operation are shown in Table 1.
- Example 5 Pyrolysis of PTFE was carried out in the same manner as in Example 1, except that no PPS was used.
- the PTFE conversion rate and the analysis results of the gas evolved during the operation are shown in Table 1.
- organic sulfur compound/fluoropolymer refers to the amount of organic sulfur compound used (total amount supplied to the rotary kiln) (unit: parts by mass) when the amount of fluoropolymer used (total amount supplied to the rotary kiln) is taken as 100 parts by mass.
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Abstract
Description
本発明者らが、特許文献1に記載された方法で含フッ素ポリマーからフルオロモノマーを製造したところ、含フッ素ポリマーの転化率に改善の余地があることを見出した。
[1] 有機硫黄化合物の存在下で含フッ素ポリマーを加熱して、上記含フッ素ポリマーを熱分解してフルオロモノマーを得る、フルオロモノマーの製造方法。
[2] 上記有機硫黄化合物が、ポリフェニレンスルフィド、ポリエーテルスルホン、及び、ポリスルホンからなる群より選択される少なくとも1種を含む、[1]に記載のフルオロモノマーの製造方法。
[3] 上記含フッ素ポリマーが、ポリテトラフルオロエチレン、テトラフルオロエチレン系共重合体、ポリクロロトリフルオロエチレン、ポリフッ化ビニリデン、ポリフッ化ビニル、フッ化ビニリデン-ヘキサフルロプロピレン共重合体、及び、パーフルオロポリエーテルゴムからなる群より選択される少なくとも1種を含む、[1]又は[2]に記載のフルオロモノマーの製造方法。
[4] 上記有機硫黄化合物の使用量が、上記含フッ素ポリマーの使用量100質量部に対して、2~300質量部である、[1]~[3]のいずれかに記載のフルオロモノマーの製造方法。
[5] 上記含フッ素ポリマーの熱分解がロータリーキルンを用いて実施される、[1]~[4]のいずれかに記載のフルオロモノマーの製造方法。
[6] 上記含フッ素ポリマーの加熱時の加熱温度が300℃以上800℃以下である、[1]~[5]のいずれかに記載のフルオロモノマーの製造方法。
「~」を用いて表される数値範囲は、「~」の前後に記載される数値を下限値及び上限値として含む範囲を意味する。
「単位」とは、単量体が重合して直接形成された、上記単量体1分子に由来する原子団と、上記原子団の一部を化学変換して得られる原子団との総称である。「単量体に基づく単位」は、以下、単に「単位」ともいう。
本発明のフルオロモノマーの製造方法(以下、「本製造方法」ともいう。)は、有機硫黄化合物の存在下で含フッ素ポリマーを加熱して、上記含フッ素ポリマーを熱分解してフルオロモノマーを得る方法である。本製造方法は、含フッ素ポリマーのリサイクルに好適である。
本製造方法によれば、含フッ素ポリマーの転化率に優れる。この理由の詳細は不明であるが、有機硫黄化合物の存在下で含フッ素ポリマーを加熱することで、含フッ素ポリマーの熱分解時においてラジカル発生が促進されて、含フッ素ポリマーの熱分解効率が向上した結果、含フッ素ポリマーの転化率が向上したと推測される。
また、本製造方法において、含フッ素ポリマーを熱分解する際の加熱温度を比較的低温(例えば、300~600℃)にした場合であっても、有機硫黄化合物の使用によって含フッ素ポリマーの熱分解が良好に進行するので、含フッ素ポリマーの転化率を十分に向上できる。
なお、有機硫黄化合物の代わりに、硫化水素等の硫黄を含むガスを使用する場合には、安全性の点や、ガスを導入するための装置が必要になるという点から問題がある。
含フッ素ポリマーは、フッ素原子を有するポリマーであれば特に限定されず、樹脂であってもよく、ゴムであってもよい。
含フッ素ポリマーは、含フッ素ポリマーを含む廃材等から得られたものであってもよい。
PFAは、TFE単位とPAVE単位のみからなる共重合体でもよく、これら以外の他の単量体に基づく単位の1種以上を含んでもよい。他の単量体の具体例としては、他のフッ素単量体(例えば、ヘキサフルオロプロピレン)、酸素含有極性基を有する単量体(例えば、5-ノルボルネン-2,3-ジカルボン酸無水物)が挙げられる。 FFKMは、TFE単位とPAVE単位のみからなる共重合体でもよく、これら以外の他の単量体に基づく単位の1種以上を含んでもよい。他の単量体の具体例としては、フッ素原子及びニトリル基を有する単量体に基づく単位、フッ素原子及び複数のビニル基を有する単量体に基づく単位が挙げられる。
含フッ素ポリマーは、上記サイズになるように予め粉砕処理や裁断処理等が施されていてもよい。
有機硫黄化合物は、硫黄原子を含む有機化合物であり、高分子化合物であってもよく、低分子化合物であってもよいが、高分子化合物であることが好ましい。
有機硫黄化合物は、本発明の効果がより優れる点から、ポリフェニレンスルフィド(以下、「PPS」ともいう。)、ポリエーテルスルホン(以下、「PES」ともいう。)、及び、ポリスルホン(以下、「PS」ともいう。)からなる群より選択される少なくとも1種を含むことが好ましく、PPSを含むことがより好ましい。有機硫黄化合物は、1種単独で用いてもよく、2種以上を併用してもよい。
PPSとしては、例えばp-ジクロロベンゼンとNa2Sとを加熱重縮合して得られたポリマーが挙げられる。
PESとしては、例えばジハロゲノジフェニルスルホンとビスフェノールSとを重縮合して得られたポリマーが挙げられる。
PSとしては、例えばビスフェノールAと4,4’-ジクロロジフェニルスルホンとを重縮合して得られたポリマーが挙げられる。
有機硫黄化合物は、上記サイズになるように予め粉砕処理や裁断処理等が施されていてもよい。
有機硫黄化合物の使用量が2質量部以上であれば、本発明の効果がより優れる。有機硫黄化合物の使用量が300質量部以下であれば、与える熱量に対しての含フッ素ポリマーの熱分解効率が良い。
本製造方法では、有機硫黄化合物の存在下で含フッ素ポリマーを加熱して、含フッ素ポリマーを熱分解する。
含フッ素ポリマーの加熱温度は、設備の設計温度の点からはより低い方が好ましく、具体的には、800℃以下が好ましく、700℃以下がより好ましく、600℃以下が更に好ましい。
ロータリーキルンは回転炉であり、本製造方法では、例えば、特許第4010300号公報に記載の装置、特許第4357999号公報に記載の装置を用いることができる。
熱分解装置1は、原料(含フッ素ポリマー及び有機硫黄化合物等)を貯蔵可能なホッパ10と、原料がその内部に供給される筒状のロータリーキルン20と、ロータリーキルン20と接続され、原料の熱分解物(フルオロモノマー等)や残渣等を回収する回収容器30と、を有する。
ロータリーキルン20の内壁面を構成する部材は、特に限定されないが、ステンレス鋼、ニッケル、及び、クロムからなる群より選択される少なくとも1種を含むことが好ましく、これらの合金であってもよい。
ここで、投入シュート14には、原料の他に、水蒸気供給管16によって水蒸気(好ましくは過熱水蒸気)が供給されてもよい。投入シュート内に供給された水蒸気は、投入シュートを介してロータリーキルン20の内部に吹き込まれる。図1では、水蒸気供給管16が投入シュート14に接続された例を示したが、これに限定されず、水蒸気供給管16はロータリーキルン20と直接接続されていてもよい。
ロータリーキルン20の内部に供給された原料は、加熱手段によって加熱されながら、ロータリーキルン20の回転によって攪拌される。これにより、ロータリーキルン20の内部で原料が熱分解して、原料の熱分解物が回収容器30に送られる。原料の熱分解物のうちガス成分は、ガス回収管32を経由して回収され、原料の熱分解物のうち固形物は、回収容器30内から回収される。
本製造方法によって得られるフルオロモノマーの具体例としては、テトラフルオロエチレン(以下、「TFE」ともいう。)、ヘキサフルオロプロピレン(以下、「HFP」ともいう。)、オクタフルオロシクロブタン(以下、「c-318」ともいう。)、フッ化ビニリデン、フッ化ビニル、クロロトリフルオロエチレン、パーフルオロアルキルビニルエーテル、及び、これらの2種以上の混合物が挙げられる。
各例において使用した原料の詳細を以下に示す。
PTFE(ポリテトラフルオロエチレン):PTFEシート(アズワン社製、厚さ1mm)を5mm角に裁断して使用した。
PPS(ポリフェニレンスルフィド):PPSフィルム(アズワン社製、厚さ0.1mm)を5mm角に裁断して使用した。
PS(ポリスルホン):PSペレット(関東化学社製)を粉砕して使用した。
各例における含フッ素ポリマーの熱分解には、上述の図1に示す熱分解装置を用いた。熱分解装置が有するロータリーキルンの詳細を以下に示す。
ロータリーキルンの内壁面を構成する部材:ニッケル合金
ロータリーキルンの内部サイズ:直径100mm、長さ500mm
各例で得られたフルオロモノマーの組成分析をガスクロマトグラフィーによって実施した。分析装置及び分析条件を以下に示す。
装置:Agilent 7890B(アジレント社製)
カラム:Poraplot-Q(内径0.32mm、長さ25m、膜厚10μm)
検出器:FID
カラム温度:100℃
注入口温度:200℃
検出器温度:250℃
上記熱分解装置のロータリーキルンの内部を600℃に加熱した。その後、ロータリーキルンの内部にPPSを18g/時、PTFEを300g/時、水蒸気を1000g/時で供給して、PTFEの熱分解を行った。なお、熱分解時におけるロータリーキルンの回転数は、5rpmとした。
2時間操作を続けた後、ロータリーキルン及び回収容器から回収された固形物の量を計量し、投入量からPTFEの転化率を計算した。結果を表1に示す。
また、操作中に発生したガスをガスクロマトグラフィーにて測定したところ、TFE及びHFP、c-318が検出された。各成分の選択率を表1に示す。
ロータリーキルンに導入するPPSの供給量を表1の値に変更した以外は、例1と同様にして、PTFEの熱分解を行った。
PTFEの転化率、操作中に発生したガスの分析結果を表1に示す。
PPSをPSに変更した以外は、例2と同様にして、PTFEの熱分解を行った。
PTFEの転化率、操作中に発生したガスの分析結果を表1に示す。
PPSを使用しない以外は例1と同様にして、PTFEの熱分解を行った。
PTFEの転化率、操作中に発生したガスの分析結果を表1に示す。
10 ホッパ
12 コンベア
14 投入シュート
16 水蒸気供給管
20 ロータリーキルン
30 回収容器
32 ガス回収管
Claims (6)
- 有機硫黄化合物の存在下で含フッ素ポリマーを加熱して、前記含フッ素ポリマーを熱分解してフルオロモノマーを得る、フルオロモノマーの製造方法。
- 前記有機硫黄化合物が、ポリフェニレンスルフィド、ポリエーテルスルホン、及び、ポリスルホンからなる群より選択される少なくとも1種を含む、請求項1に記載のフルオロモノマーの製造方法。
- 前記含フッ素ポリマーが、ポリテトラフルオロエチレン、テトラフルオロエチレン系共重合体、ポリクロロトリフルオロエチレン、ポリフッ化ビニリデン、ポリフッ化ビニル、フッ化ビニリデン-ヘキサフルロプロピレン共重合体、及び、パーフルオロポリエーテルゴムからなる群より選択される少なくとも1種を含む、請求項1又は2に記載のフルオロモノマーの製造方法。
- 前記有機硫黄化合物の使用量が、前記含フッ素ポリマーの使用量100質量部に対して、2~300質量部である、請求項1又は2に記載のフルオロモノマーの製造方法。
- 前記含フッ素ポリマーの熱分解がロータリーキルンを用いて実施される、請求項1又は2に記載のフルオロモノマーの製造方法。
- 前記含フッ素ポリマーの加熱時の加熱温度が300℃以上800℃以下である、請求項1又は2に記載のフルオロモノマーの製造方法。
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0948980A (ja) * | 1995-05-29 | 1997-02-18 | Mitsui Petrochem Ind Ltd | 合成重合体の分解による油状物の製造方法 |
| WO2003074456A1 (en) * | 2002-03-01 | 2003-09-12 | Daikin Industries, Ltd. | Process for producing fluoromonomer |
| JP4357999B2 (ja) | 2004-02-17 | 2009-11-04 | 月島環境エンジニアリング株式会社 | 弗素含有固体の熱分解リサイクル方法 |
| JP2023507079A (ja) * | 2019-12-17 | 2023-02-21 | サウジ アラビアン オイル カンパニー | 超臨界水によるポリオレフィンからの液体炭化水素の生成 |
| JP2023093289A (ja) | 2021-12-22 | 2023-07-04 | 日本電気硝子株式会社 | 調理器用トッププレート |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0948980A (ja) * | 1995-05-29 | 1997-02-18 | Mitsui Petrochem Ind Ltd | 合成重合体の分解による油状物の製造方法 |
| WO2003074456A1 (en) * | 2002-03-01 | 2003-09-12 | Daikin Industries, Ltd. | Process for producing fluoromonomer |
| JP4010300B2 (ja) | 2002-03-01 | 2007-11-21 | ダイキン工業株式会社 | フルオロモノマーの製造方法 |
| JP4357999B2 (ja) | 2004-02-17 | 2009-11-04 | 月島環境エンジニアリング株式会社 | 弗素含有固体の熱分解リサイクル方法 |
| JP2023507079A (ja) * | 2019-12-17 | 2023-02-21 | サウジ アラビアン オイル カンパニー | 超臨界水によるポリオレフィンからの液体炭化水素の生成 |
| JP2023093289A (ja) | 2021-12-22 | 2023-07-04 | 日本電気硝子株式会社 | 調理器用トッププレート |
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