WO2024252818A1 - フッ化ビニリデンとアセチレンの分離方法 - Google Patents
フッ化ビニリデンとアセチレンの分離方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C11/00—Aliphatic unsaturated hydrocarbons
- C07C11/22—Aliphatic unsaturated hydrocarbons containing carbon-to-carbon triple bonds
- C07C11/24—Acetylene
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/38—Separation; Purification; Stabilisation; Use of additives
- C07C17/383—Separation; Purification; Stabilisation; Use of additives by distillation
- C07C17/386—Separation; Purification; Stabilisation; Use of additives by distillation with auxiliary compounds
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C21/00—Acyclic unsaturated compounds containing halogen atoms
- C07C21/02—Acyclic unsaturated compounds containing halogen atoms containing carbon-to-carbon double bonds
- C07C21/18—Acyclic unsaturated compounds containing halogen atoms containing carbon-to-carbon double bonds containing fluorine
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/04—Purification; Separation; Use of additives by distillation
- C07C7/05—Purification; Separation; Use of additives by distillation with the aid of auxiliary compounds
- C07C7/08—Purification; Separation; Use of additives by distillation with the aid of auxiliary compounds by extractive distillation
Definitions
- This disclosure relates to a method for separating vinylidene fluoride and acetylene.
- Vinylidene fluoride is useful as a monomer for fluororesins.
- Patent Document 1 describes a method for separating vinylidene fluoride (VdF) and trifluoroethane, which includes a step of adding a first extraction solvent, which is at least one selected from the group consisting of alcohols, ketones, esters, amides, ethers, sulfoxides, and nitriles having 1 to 3 carbon atoms, to a first mixture containing VdF and trifluoroethane to obtain a second mixture, and an extractive distillation step of distilling the second mixture to obtain a distillate mainly composed of VdF and a bottoms product mainly composed of the first extraction solvent and containing trifluoroethane.
- a first extraction solvent which is at least one selected from the group consisting of alcohols, ketones, esters, amides, ethers, sulfoxides, and nitriles having 1 to 3 carbon atoms
- Patent Document 1 is a method for separating VdF and trifluoroethane, and is not necessarily applicable to separating VdF and acetylene.
- One aspect of the present disclosure aims to provide a method for efficiently separating VdF and acetylene from a mixture of VdF and acetylene.
- a method for separating vinylidene fluoride and acetylene comprising: ⁇ 2> The method for separating vinylidene fluoride and acetylene according to ⁇ 1>, wherein in the mixture for extraction, the ratio of the molar amount of the extraction solvent to the molar amount of acetylene is 0.1 to 1000.
- ⁇ 3> The method for separating vinylidene fluoride and acetylene according to ⁇ 1> or ⁇ 2>, further comprising a step of distilling the bottoms to recover an extraction solvent.
- ⁇ 4> The method for separating vinylidene fluoride and acetylene according to ⁇ 3>, wherein the recovered extraction solvent is reused in the step of obtaining a mixture for extraction.
- ⁇ 5> The method for separating vinylidene fluoride and acetylene according to any one of ⁇ 1> to ⁇ 4>, wherein the first mixture further contains ethylene.
- ⁇ 6> The method for separating vinylidene fluoride and acetylene according to any one of ⁇ 1> to ⁇ 5>, wherein the extraction solvent is chloroform.
- a method for efficiently separating VdF and acetylene from a mixture of VdF and acetylene is provided.
- a numerical range indicated using “to” means a range that includes the numerical values before and after “to” as the minimum and maximum values, respectively.
- the upper or lower limit value described in a certain numerical range may be replaced with the upper or lower limit value of another numerical range described in the present disclosure.
- the upper or lower limit value described in a certain numerical range may be replaced with a value shown in the examples.
- combinations of two or more preferred aspects are more preferred aspects.
- the amount of each component means the total amount of the multiple substances, unless otherwise specified.
- distillate refers to material that is distilled from the top of a distillation column
- bottoms refers to material that is distilled from the bottom of a distillation column.
- main component means that the molar amount of components other than the component in question is relatively small.
- the amount of the "main component” is preferably 50 mol % or more of the total, more preferably 60 mol % or more, even more preferably 70 mol % or more, and most preferably 80 mol % or more.
- the boiling point of a compound is a value at normal pressure, which is 1.013 ⁇ 10 5 Pa.
- the method for separating VdF and acetylene disclosed herein includes the steps of: mixing a first mixture containing VdF and acetylene with an extracting solvent that is at least one compound selected from the group consisting of methanol, acetone, chloroform, and 1-chloro-2,3,3-trifluoro-1-propene to obtain an extraction mixture; and distilling the extraction mixture to obtain a distillate whose main component is vinylidene fluoride and a bottoms product whose main component is the extracting solvent and further contains acetylene.
- an extracting solvent that is at least one compound selected from the group consisting of methanol, acetone, chloroform, and 1-chloro-2,3,3-trifluoro-1-propene
- the method for separating VdF and acetylene disclosed herein allows for efficient separation of VdF and acetylene.
- VdF is useful as a monomer for fluororesin, but for example, when a polymerization reaction is carried out using a composition containing VdF and acetylene as an impurity, the acetylene reacts with the polymerization initiator, making it difficult for the desired polymerization reaction to proceed. This can easily result in the rate of the polymerization reaction slowing down or stopping, making it difficult to obtain the desired polymer. For this reason, it is desirable to separate VdF and acetylene to obtain high-purity VdF. However, VdF has a boiling point of -83°C, and acetylene has a boiling point of -84°C. Because VdF and acetylene have similar boiling points, it is difficult to separate and purify VdF and acetylene by normal distillation.
- Patent Document 1 describes a method for separating VdF from trifluoroethane, but an extraction solvent suitable for the method for separating VdF from trifluoroethane is not necessarily a suitable extraction solvent for the method for separating VdF from acetylene.
- VdF and acetylene can be efficiently separated by using an extraction solvent containing at least one selected from the group consisting of methanol, acetone, chloroform, and 1-chloro-2,3,3-trifluoro-1-propene.
- the method for separating VdF and acetylene disclosed herein includes a step of mixing a mixture containing VdF and acetylene with a compound having a boiling point of ⁇ 60 to 0° C. to obtain a mixture for extraction (hereinafter also referred to as the “mixing step”).
- the first mixture containing VdF and acetylene may contain other components other than VdF and acetylene, but from the viewpoint of efficiently obtaining high-purity VdF, it is preferable that the content of other components is small.
- examples of other components include fluoroolefins other than VdF and ethylene.
- the first mixture contains ethylene, which may be mixed in during the production process of VdF.
- the total content of VdF and acetylene relative to the total amount of the first mixture is, for example, 50 mol% or more, may be 80 mol% or more, may be 90 mol% or more, may be 99 mol% or more, or may be 100 mol%.
- the molar ratio of VdF to acetylene is not particularly limited. From the viewpoint of production efficiency, the ratio of the molar amount of acetylene to the molar amount of VdF (i.e., the molar ratio) is preferably 0.01 to 1, more preferably 0.01 to 0.5, and even more preferably 0.01 to 0.1.
- the first mixture may be, for example, a reaction product containing VdF obtained by reacting various raw materials for the purpose of producing VdF.
- the extraction solvent is at least one compound selected from the group consisting of methanol, acetone, chloroform, and 1-chloro-2,3,3-trifluoro-1-propene.
- Chloroform is the preferred extraction solvent because it has excellent separation properties between VdF and acetylene. Furthermore, when chloroform is used as the extraction solvent, it also has excellent separation properties between VdF and ethylene.
- the boiling point of ethylene is -103.7°C, which is lower than the boiling point of VdF. Therefore, when normal distillation is performed, ethylene is accompanied by VdF, making separation difficult, but by using chloroform, which has a high affinity for ethylene, VdF and ethylene can be separated.
- the ratio of the molar amount of the extraction solvent to the molar amount of acetylene is 0.1 to 1000.
- extractive distillation tower when a first mixture containing VdF and acetylene is supplied to the extractive distillation tower, and an extractive solvent is also supplied to the extractive distillation tower, "extractive solvent/acetylene” represents the molar ratio of the amount of extractive solvent supplied to the extractive distillation tower to the amount of acetylene supplied to the extractive distillation tower.
- the mixing step from the viewpoint of separating VdF and acetylene with high efficiency, it is preferable to select the type of extraction solvent and adjust the amount of extraction solvent added so that the relative volatility Rv of the extraction mixture is greater than 1.1.
- the relative volatility Rv is preferably 1.2 or more, and more preferably 1.3 or more.
- Rv of VdF to acetylene is expressed by the following formula.
- Rv (molar fraction of VdF in the gas phase / mole fraction of VdF in the liquid phase) / (molar fraction of acetylene in the gas phase / mole fraction of acetylene in the liquid phase)
- the method of mixing the first mixture containing VdF and acetylene with the extraction solvent is not particularly limited.
- the extraction solvent may be added to the first mixture containing VdF and acetylene, or the first mixture containing VdF and acetylene may be added to the extraction solvent.
- an extraction solvent to the extractive distillation tower to which the first mixture containing VdF and acetylene has been supplied, prepare the extraction mixture in the extractive distillation tower, and perform distillation immediately after the preparation is completed.
- the extraction mixture may contain other components other than VdF, acetylene, and the extraction solvent.
- Other components other than VdF, acetylene, and the extraction solvent that may be contained in the extraction mixture include other components that may be contained in the first mixture containing VdF and acetylene.
- the method for separating VdF and acetylene disclosed herein includes a step of distilling the extraction mixture to obtain a distillate whose main component is VdF and a bottoms product whose main component is the extraction solvent and further contains acetylene (hereinafter also referred to as the "extractive distillation step").
- the extractive distillation process can be carried out using a commonly used distillation apparatus, for example, a distillation tower such as a plate tower, a packed tower, etc.
- a distillation tower such as a plate tower, a packed tower, etc.
- Various conditions of the extractive distillation process for example, the operating temperature, operating pressure, reflux ratio, total number of stages in the distillation tower, position of the charging stage, position of the extraction solvent supply stage, etc., are not particularly limited and can be appropriately selected to achieve the desired separation.
- the number of stages of the distillation tower can be, for example, 1 to 100, and from the viewpoint of obtaining VdF with high purity, 30 or more is preferable, and 50 or more is more preferable. Since both VdF and acetylene have low boiling points, it is preferable to carry out the extractive distillation under pressure, for example, a pressure of 0 to 5 MPaG (gauge pressure).
- the temperatures at the top and bottom of the distillation tower are determined according to the operating pressure and the composition of the distillate and bottom products.
- the temperature at the top of the tower be -60 to 100°C and the temperature at the bottom of the tower be -10 to 300°C.
- Extractive distillation can be performed in either a batch or continuous manner, or in a semi-continuous manner in which the distillate and bottom products are intermittently withdrawn or intermittently charged, but it is preferable to continuously supply the extraction solvent to the distillation apparatus.
- the above-mentioned extraction solvent has an affinity for acetylene. Therefore, by extractively distilling an extraction mixture containing VdF, acetylene, and the extraction solvent, a distillate containing VdF as the main component is obtained from the top side of the extractive distillation tower.
- the composition of this distillate is not limited as long as it contains VdF as the main component, but the molar fraction of VdF in the distillate is preferably 90 mol% or more, and more preferably 99 mol% or more.
- the molar fraction of acetylene in the distillate is preferably 1/10 or less, and more preferably 1/100 or less, of the molar fraction of acetylene in the extraction mixture.
- the molar fraction of acetylene in the distillate is preferably 10 mol% or less, more preferably 1 mol% or less, and even more preferably 0.1 mol% or less.
- a bottom product containing the extraction solvent as the main component and further containing acetylene is obtained from the bottom side of the extractive distillation tower.
- the composition of this bottom product is not limited as long as it contains the extraction solvent as the main component, but the molar fraction of the extraction solvent in the bottom product is preferably 30 mol % or more, and more preferably 50 mol % or more.
- the molar fraction of acetylene in the bottom product is preferably higher than the molar fraction of acetylene in the extraction mixture.
- the molar fraction of acetylene in the bottom product is more preferably 1.1 or more of the molar fraction of acetylene in the extraction mixture, and even more preferably 2 or more.
- the method for separating VdF and acetylene according to the present disclosure preferably further includes a step of distilling the bottoms to recover the extraction solvent (hereinafter also referred to as the "distillation step").
- the distillation process can be carried out using a distillation apparatus similar to that used in the extractive distillation process.
- the various conditions of the distillation process such as the operating temperature, operating pressure, reflux ratio, total number of stages in the distillation column, and the position of the feed stage, are not particularly limited and can be appropriately selected to achieve the desired separation.
- the distillation process separates the extraction solvent from the VdF and acetylene, allowing the extraction solvent to be recovered.
- a bottom product containing the extraction solvent is obtained from the bottom side of the distillation tower. It is preferable to reuse the recovered extraction solvent in the above-mentioned extraction distillation process.
- the difference in boiling points between acetylene and the extraction solvent is large, so that the separation between acetylene and the extraction solvent is excellent. Therefore, a high-purity extraction solvent can be recovered, making it suitable for reuse.
- Examples 1 to 4 are examples, and Examples 5 to 9 are comparative examples.
- AS-300 Product name "AS-300”, manufactured by AGC Co., Ltd. A mixture of 1-chloro-2,3,3-trifluoro-1-propene (E) and 1-chloro-2,3,3-trifluoro-1-propene (Z).
- AC-2000 Product name "ASAHIKLIN AC-2000", manufactured by AGC Co., Ltd. 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorohexane.
- AE-3000 Product name "ASAHIKLIN AE-3000", manufactured by AGC Co., Ltd. 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether.
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Abstract
Description
<1>
フッ化ビニリデン及びアセチレンを含む第1の混合物と、メタノール、アセトン、クロロホルム、及び1-クロロ-2,3,3-トリフルオロ-1-プロペンからなる群より選択される少なくとも1種の化合物である抽出溶剤と、を混合して抽出用混合物を得る工程と、
抽出用混合物を蒸留して、主成分がフッ化ビニリデンである留出物と、主成分が抽出溶剤であり、さらにアセチレンを含む缶出物と、をそれぞれ得る工程と、
を含む、フッ化ビニリデンとアセチレンの分離方法。
<2>
抽出用混合物において、アセチレンのモル量に対する、抽出溶剤のモル量の比率は、0.1~1000である、<1>に記載のフッ化ビニリデンとアセチレンの分離方法。
<3>
缶出物を蒸留して、抽出溶剤を回収する工程をさらに含む、<1>又は<2>に記載のフッ化ビニリデンとアセチレンの分離方法。
<4>
回収した抽出溶剤を、抽出用混合物を得る工程において再使用する、<3>に記載のフッ化ビニリデンとアセチレンの分離方法。
<5>
第1の混合物は、さらにエチレンを含む、<1>~<4>のいずれか1つに記載のフッ化ビニリデンとアセチレンの分離方法。
<6>
抽出溶剤は、クロロホルムである、<1>~<5>のいずれか1つに記載のフッ化ビニリデンとアセチレンの分離方法。
本開示に段階的に記載されている数値範囲において、ある数値範囲で記載された上限値又は下限値は、他の段階的な記載の数値範囲の上限値又は下限値に置き換えてもよい。また、本開示に記載されている数値範囲において、ある数値範囲で記載された上限値又は下限値は、実施例に示されている値に置き換えてもよい。
本開示において、2以上の好ましい態様の組み合わせは、より好ましい態様である。
本開示において、各成分の量は、各成分に該当する物質が複数種存在する場合には、特に断らない限り、複数種の物質の合計量を意味する。
本開示において「主成分」とは、当該成分以外の成分のモル量が相対的に少ないことを意味する。「主成分」の量は全体の50モル%以上が好ましく、より好ましくは60モル%以上、さらに好ましくは70モル%以上、最も好ましくは80モル%以上である。
本開示において、特に断りのない限り、化合物の沸点は常圧での値であり、常圧は1.013×105Paである。
本開示のVdFとアセチレンの分離方法は、VdF及びアセチレンを含む第1の混合物と、メタノール、アセトン、クロロホルム、及び1-クロロ-2,3,3-トリフルオロ-1-プロペンからなる群より選択される少なくとも1種の化合物である抽出溶剤と、を混合して抽出用混合物を得る工程と、抽出用混合物を蒸留して、主成分がフッ化ビニリデンである留出物と、主成分が抽出溶剤であり、さらにアセチレンを含む缶出物と、をそれぞれ得る工程と、を含む。
本開示のVdFとアセチレンの分離方法は、VdF及びアセチレンを含む混合物と、沸点-60~0℃の化合物と、を混合して抽出用混合物を得る工程(以下、「混合工程」ともいう)を含む。
VdF及びアセチレンを含む第1の混合物は、VdF及びアセチレン以外の他の成分を含んでいてもよいが、効率良く高純度のVdFを得る観点から、他の成分の含有量は少ない方が好ましい。他の成分としては、例えば、VdF以外のフルオロオレフィン、及び、エチレンが挙げられる。中でも、第1の混合物は、VdFの製造工程で混入し得るエチレンを含んでいることが好ましい。
抽出溶剤は、メタノール、アセトン、クロロホルム、及び1-クロロ-2,3,3-トリフルオロ-1-プロペンからなる群より選択される少なくとも1種の化合物である。
Rv=(気相部におけるVdFのモル分率/液相部におけるVdFのモル分率)/(気相部におけるアセチレンのモル分率/液相部におけるアセチレンのモル分率)
本開示のVdFとアセチレンの分離方法は、抽出用混合物を蒸留して、主成分がVdFである留出物と、主成分が抽出溶剤であり、さらにアセチレンを含む缶出物と、をそれぞれ得る工程(以下、「抽出蒸留工程」ともいう)を含む。
本開示のVdFとアセチレンの分離方法は、缶出物を蒸留して、抽出溶剤を回収する工程(以下、「蒸留工程」ともいう)をさらに含むことが好ましい。
以下の各成分を混合して、第1の混合物を準備した。
・VdF…0.134モル
・アセチレン…0.111モル
・エチレン…1.000モル
・メタン…0.0837モル
・クロロメタン…0.0873モル
表1中、「AS-300」「AC-2000」「AE-3000」の詳細は以下のとおりである。
AS-300:製品名「AS-300」、AGC社製。1-クロロ-2,3,3-トリフルオロ-1-プロペン(E)と1-クロロ-2,3,3-トリフルオロ-1-プロペン(Z)の混合物である。
AC-2000:製品名「アサヒクリンAC-2000」、AGC社製。1,1,1,2,2,3,3,4,4,5,5,6,6-トリデカフルオロヘキサン。
AE-3000:製品名「アサヒクリンAE-3000」、AGC社製。1,1,2,2-テトラフルオロエチル-2,2,2-トリフルオロエチルエーテル。
・メタノール:0.625モル
・アセトン:0.345モル
・クロロホルム:0.168モル
・AS300:0.135モル
・四塩化炭素:0.130モル
・AC2000:0.0625モル
・AE3000:0.100モル
・シクロヘキサン:0.238モル
比揮発度の測定において、得られた液の組成分析はガスクロマトグラフ(GC)を用いた。カラムはDB-1(長さ60m×内径250μm×厚み1μm、アジレント・テクノロジー社製)を用いた。
圧力計付き耐圧オートクレーブに、調製した第1の混合物と、必要に応じて抽出溶剤と、を注入した。圧力が1.0MPaG程度になるように温度を調整し、1日保持して、オートクレーブ内の組成を安定化させた。
特に、例3では、抽出溶媒として、クロロホルムを用いており、VdFに対するアセチレンの比揮発度、及び、VdFに対するエチレンの比揮発度がいずれも非常に高く、VdFとアセチレンをより効率良く分離できることが分かった。
Claims (6)
- フッ化ビニリデン及びアセチレンを含む第1の混合物と、メタノール、アセトン、クロロホルム、及び1-クロロ-2,3,3-トリフルオロ-1-プロペンからなる群より選択される少なくとも1種の化合物である抽出溶剤と、を混合して抽出用混合物を得る工程と、
前記抽出用混合物を蒸留して、主成分がフッ化ビニリデンである留出物と、主成分が抽出溶剤であり、さらにアセチレンを含む缶出物と、をそれぞれ得る工程と、
を含む、フッ化ビニリデンとアセチレンの分離方法。 - 前記抽出用混合物において、アセチレンのモル量に対する、前記抽出溶剤のモル量の比率は、0.1~1000である、請求項1に記載のフッ化ビニリデンとアセチレンの分離方法。
- 前記缶出物を蒸留して、前記抽出溶剤を回収する工程をさらに含む、請求項1又は請求項2に記載のフッ化ビニリデンとアセチレンの分離方法。
- 回収した抽出溶剤を、前記抽出用混合物を得る工程において再使用する、請求項3に記載のフッ化ビニリデンとアセチレンの分離方法。
- 前記第1の混合物は、さらにエチレンを含む、請求項1又は請求項2に記載のフッ化ビニリデンとアセチレンの分離方法。
- 前記抽出溶剤は、クロロホルムである、請求項1又は請求項2に記載のフッ化ビニリデンとアセチレンの分離方法。
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4842620B1 (ja) * | 1968-01-12 | 1973-12-13 | ||
| WO2013137409A1 (ja) * | 2012-03-14 | 2013-09-19 | 旭硝子株式会社 | 2,3,3,3-テトラフルオロプロペンおよび1,1-ジフルオロエチレンの製造方法 |
| WO2013137408A1 (ja) * | 2012-03-14 | 2013-09-19 | 旭硝子株式会社 | 2,3,3,3-テトラフルオロプロペンの製造方法 |
| WO2015072305A1 (ja) * | 2013-11-14 | 2015-05-21 | 旭硝子株式会社 | フッ化ビニリデンとトリフルオロメタンの分離方法、およびフッ化ビニリデンの製造方法 |
| WO2017029868A1 (ja) * | 2015-08-17 | 2017-02-23 | ダイキン工業株式会社 | ハロゲン化不飽和炭素化合物の分離方法 |
| JP2019501862A (ja) * | 2016-01-14 | 2019-01-24 | エスアールエフ リミテッド | 含フッ素オレフィンの製造方法 |
| CN110818529A (zh) * | 2019-10-11 | 2020-02-21 | 江苏梅兰化工有限公司 | 一种制备高纯偏氟乙烯的新工艺 |
-
2024
- 2024-04-24 WO PCT/JP2024/016134 patent/WO2024252818A1/ja not_active Ceased
- 2024-04-24 CN CN202480037141.2A patent/CN121335876A/zh active Pending
- 2024-04-24 JP JP2025525984A patent/JPWO2024252818A1/ja active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4842620B1 (ja) * | 1968-01-12 | 1973-12-13 | ||
| WO2013137409A1 (ja) * | 2012-03-14 | 2013-09-19 | 旭硝子株式会社 | 2,3,3,3-テトラフルオロプロペンおよび1,1-ジフルオロエチレンの製造方法 |
| WO2013137408A1 (ja) * | 2012-03-14 | 2013-09-19 | 旭硝子株式会社 | 2,3,3,3-テトラフルオロプロペンの製造方法 |
| WO2015072305A1 (ja) * | 2013-11-14 | 2015-05-21 | 旭硝子株式会社 | フッ化ビニリデンとトリフルオロメタンの分離方法、およびフッ化ビニリデンの製造方法 |
| WO2017029868A1 (ja) * | 2015-08-17 | 2017-02-23 | ダイキン工業株式会社 | ハロゲン化不飽和炭素化合物の分離方法 |
| JP2019501862A (ja) * | 2016-01-14 | 2019-01-24 | エスアールエフ リミテッド | 含フッ素オレフィンの製造方法 |
| CN110818529A (zh) * | 2019-10-11 | 2020-02-21 | 江苏梅兰化工有限公司 | 一种制备高纯偏氟乙烯的新工艺 |
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| Publication number | Publication date |
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| CN121335876A (zh) | 2026-01-13 |
| JPWO2024252818A1 (ja) | 2024-12-12 |
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