摘要:
To provide a process for producing a desired perfluorinated product at a high yield in a fluorination reaction of a partially fluorinated ester. A perfluorinated compound (4) is obtained by fluorinating in a liquid phase a compound (3) (wherein the fluorine content is at least 30 mass%) obtained by reacting a compound (1) and a compound (2), wherein the compound (1) is HOCH 2 -R A -CH 2 OH, the compound (2) is X 1 C(=O)-C(R B )(R C )(R D ), R A is a bivalent saturated hydrocarbon group or the like which has no hetero atom such as an etheric oxygen atom, X 1 is a halogen atom, and -C(R B )(R C )(R D ) is a branched group.
摘要:
To provide a method for recovering an anionic fluorinated emulsifier, whereby an anionic fluorinated emulsifier adsorbed on a basic ion exchange resin can be simply and efficiently recovered. An aqueous inorganic acid solution and an organic solvent having a nitrile group are contacted to a basic ion exchange resin having an anionic fluorinated emulsifier adsorbed thereon, to recover a liquid phase containing the anionic fluorinated emulsifier, or an aqueous inorganic acid solution is contacted to a basic ion exchange resin having an anionic fluorinated emulsifier adsorbed thereon, then an organic solvent having a nitrile group is contacted thereto, and thereafter the basic ion exchange resin and a liquid phase are separated to recover the liquid phase, whereupon from the liquid phase, an acid of the anionic fluorinated emulsifier is recovered.
摘要:
A method for preparing saturated partially fluorinated alkoxy carboxylic acids or salts thereof by treating a compound: (II), where R f represents a fluorinated, linear or branched alkyl residue interruptible by one or more oxygen atoms, n is 0 or 1, with a Z-anion in a reaction medium comprising water and an organic solvent, where the Z-anion is selected from CN-, SCN- and OCN- or combinations thereof. A method of making partially fluorinated ethers of the general formula (I) wherein R f is defined as above, n is 0 or 1, and Z is nitrile (-CN), azide (-N 3 ), thiocyanate (-SCN) or cyanate (-OCN) group, said method comprising treating a fluorinated olefin of the general formula (II) wherein the Z-anion is CN-, OCN-, SCN- or N 3 -. A compound of the general formula (I) as previously described where Z is selected from SCN, OCN and N 3 .
摘要:
The object of the present invention is to provide a process for industrially preparing a fluorocarboxylic acid in high purity and in high yield. The present invention is a process for preparing a fluorocarboxylic acid, which comprises: a dehydration step of removing from a mixture containing a fluorocarboxylic acid and water at least a part of said water to obtain a dehydrated fluorocarboxylic acid solution; and a purification step of purifying said dehydrated fluorocarboxylic acid solution.
摘要:
To provide a method for purifying a fluorinated carboxylic acid having an etheric oxygen atom and its derivative, with small decomposition and inclusion of impurities. A liquid containing at least one member selected from the group consisting of a fluorinated compound represented by the following formula (1) and a fluorinated compound represented by the following formula (2) is held at a heating temperature of at most 150°C and distilled:
R F OR 1 COOH (1)
R F OR 1 COOR 2 (2)
R F is a linear or branched monovalent fluoroorganic group which may have an etheric oxygen atom in its main chain, R 1 is a linear or branched bivalent organic group, and R 2 is a linear or branched monovalent organic group. Further, the liquid is a liquid obtained from any of a waste liquid after an aqueous emulsion of a fluoropolymer is coagulated and the fluoropolymer is separated, an aqueous liquid obtained by cleaning an exhaust gas in a step of drying and/or a step of heat treatment of the separated fluoropolymer, and a liquid obtained by cleaning an anion exchange resin which has been brought into contact with the waste liquid or an aqueous dispersion obtained from the aqueous emulsion of the fluoropolymer, with an alkaline aqueous solution.
摘要:
The present invention provides a process for producing 1,1,1,3,3,3-hexafluoro-2-methoxypropane, wherein a novel compound, 2-methoxy-2-trifluoromethyl-3,3,3-trifluoropropionic acid or a salt thereof is decarboxylated, or wherein an olefin compound represented by chemical formula (4): CF 2 =C(CF 3 )(OCH 3 ) is reacted with a fluorinating agent; and a process for producing 2-methoxy-2-trifluoromethyl-3,3,3-trifluoropropionic acid or a salt thereof by reacting a hydroxycarboxylic ester with a methylating agent and then hydrolyzing the reaction product, or hydrolyzing the hydroxycarboxylic ester and then reacting the resulting product with a methylating agent. In accordance with the invention, 1,1,1,3,3,3-hexafluoro-2-methoxypropane, which is useful as a raw material for, for example, the anesthetic Sevoflurane, can be produced efficiently and at low cost.