- BUTENE CONVERSION METHOD AND MONOFLUOROBUTANE PURIFICATION METHOD
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Provided is an industrially simple and cheap method for efficiently removing butene from crude monofluorobutane containing butene without causing substantial decomposition, transformation, or the like of the monofluorobutane. In a provided monofluorobutane purification method, crude monofluorobutane containing butene is brought into contact with trihalomethane in the presence of an alkali aqueous solution to convert the butene to a compound having a higher boiling point than the monofluorobutane, water is subsequently added to a reaction mixture obtained thereby to dissolve a produced salt, an organic layer is separated, and then the separated organic layer is purified by distillation.
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Paragraph 0107; 0108; 0113; 0114; 0115-0133
(2019/06/20)
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- METHOD FOR PRODUCING FLUORINATED HYDROCARBONS
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Provided is a method for industrially advantageously producing a fluorinated hydrocarbon (3). The disclosed method for producing a fluorinated hydrocarbon represented by formula (3) includes bringing into contact, in a hydrocarbon-based solvent, a secondary or tertiary ether compound represented by formula (1) below with an acid fluoride represented by formula (2) in the presence of lithium salt or sodium salt (in the formulae, R1 and R2 each represent a C1-3 alkyl, and R1 and R2 may be bonded to each other to form a ring structure; R3 represents a hydrogen atom, methyl, or ethyl; and R4 and R5 each represent methyl or ethyl).
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Paragraph 0108; 0110; 0112-0118; 0121-0124; 0129; 0132
(2020/01/12)
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- METHOD FOR MANUFACTURING FLUORINATED HYDROCARBON
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The present invention is a method for producing a fluorinated hydrocarbon represented by a structural formula (3), wherein an ether compound represented by a structural formula (1) and an acid fluoride represented by a structural formula (2) are brought into contact with each other in a hydrocarbon-based solvent, in the presence of a catalyst in which boron trifluoride is supported on a metal oxide: wherein R1 and R2 represent an alkyl group having 1 to 3 carbon atoms, R3 represents a hydrogen atom, a methyl group or an ethyl group, and R4 and R5 represent a methyl group or an ethyl group; and R4 and R2 may be bonded to each other to form a cyclic structure. Through the present invention, a method for industrially advantageously producing 2-fluorobutane is provided.
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Paragraph 0105-0127
(2018/08/20)
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- MANUFACTURING METHOD OF FLUORINATED HYDROCARBON
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PROBLEM TO BE SOLVED: To provide a method for industrially advantageously manufacturing fluorinated hydrocarbon (3). SOLUTION: There is provided a method for manufacturing fluorinated hydrocarbon represented by the formula (3), including contacting a secondary or tertiary ether compound represented by the formula (1) and acid fluoride represented by the formula (2) in the presence of a silver salt in a hydrocarbon solvent. R1 and R2 are each independently a C1 to 3 alkyl group, R1 and R2 may bind to form a ring structure, R3 is H, a methyl group or an ethyl group, R4 and R5 are each independently a methyl group or an ethyl group. SELECTED DRAWING: None COPYRIGHT: (C)2018,JPOandINPIT
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Paragraph 0069; 0073; 0074; 0080; 0082; 0084; 0093
(2018/05/08)
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- METHOD FOR PRODUCING FLUORINATED HYDROCARBON
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PROBLEM TO BE SOLVED: To provide a method for industrially advantageously producing a fluorinated hydrocarbon. SOLUTION: The method for producing a fluorinated hydrocarbon represented by formula (3) comprises bringing a secondary or tertiary ether compound represented by formula (1) into contact with an acid fluoride represented by formula (2) in the presence of a compound having an N-X bond (X is a halogen atom selected from a chlorine atom, a bromine atom, and an iodine atom) in a halogenated hydrocarbon-based solvent. (R1 and R2 are each independently a C1-C3 alkyl group; R3 is H, a methyl group, or an ethyl group; R4 and R5 are each a methyl group or an ethyl group; and R1 and R2 may be bonded together to form a ring structure.) SELECTED DRAWING: None COPYRIGHT: (C)2018,JPOandINPIT
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Paragraph 0061; 0072
(2018/03/09)
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- METHOD FOR PRODUCING FLUORINATED HYDROCARBON
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PROBLEM TO BE SOLVED: To provide an industrially advantageous method for producing a fluorinated hydrocarbon such as 2-fluorobutane useful as etching gas for a dry etching process. SOLUTION: There is provided a method for producing a fluorinated hydrocarbon represented by formula (3) by bringing an ether compound represented by formula (1) into contact with an acid fluoride represented by formula (2) in a halogenated hydrocarbon solvent in the presence of a metal halide represented by formula (4): MX3 (M represents a metal atom; X represents a chlorine atom or a bromine atom) (R1 and R2 each independently represent an alkyl group having 1-3 carbon atoms; R1 and R2 may be bonded to form a ring structure; R3 represents H, a methyl group or an ethyl group; R4 and R5 each independently represent a methyl group or an ethyl group.) SELECTED DRAWING: None COPYRIGHT: (C)2017,JPOandINPIT
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Paragraph 0054; 0068; 0069; 0077
(2017/10/31)
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- The fluorinated hydrocarbon production (by machine translation)
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2 - fluorobutane industrially advantageous production method [a]. (1) the ether compound represented by the formula [a], equation (2) as shown in the di-acid, a hydrocarbon-based solvent, in the presence of boron trifluoride catalyst is carried on a polyvinylpyrrolidone, contacting, formula (3) represented by the production of fluorinated hydrocarbons. (R1 And R2 The alkyl groups are independently C1 a-3; R1 And R2 The coupling may form a ring structure; R3 Is H, a methyl group or an ethyl group; R4 Is a methyl group or an ethyl group; R5 Is a methyl group or ethyl group)[Drawing] no (by machine translation)
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Paragraph 0072
(2017/09/02)
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- METHOD FOR PRODUCING FLUORINATED HYDROCARBON
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The present invention is a method for producing a fluorohydrocarbon represented by a structural formula (3) comprising bringing a secondary or tertiary ether compound represented by a structural formula (1) into contact with an acid fluoride represented by a structural formula (2) in a hydrocarbon-based solvent in the presence of a boron trifluoride complex. (In structural formulae (1) to (3), each of R1 and R2 represents an alkyl group having 1 to 3 carbon atoms, R3 represents a hydrogen atom, a methyl group, or an ethyl group, and each of R4 and R5 represents a methyl group or an ethyl group, provided that R1 and R2 are optionally bonded to each other to form a ring structure.)
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Paragraph 0062
(2017/07/14)
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- HIGH-PURITY 2-FLUOROBUTANE
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The present invention is a high-purity 2-fluorobutane having a purity of 99.9 vol % or more and a butene content of 1,000 ppm by volume or less, and a method for using the high-purity 2-fluorobutane as a dry etching gas. According to the present invention, a high-purity 2-fluorobutane that is suitable as a plasma reaction gas for semiconductors is provided.
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Paragraph 0043-0044
(2016/03/13)
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- METHOD FOR PURIFYING 2-FLUOROBUTANE
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The present invention is a method for 2-fluorobutane to obtain highly purified 2-fluorobutane through a process comprising a step for: bringing crude 2-fluorobutane that includes 5 to 50 wt % of butene into contact with a brominating agent that can form a bromonium ion in an aprotic polar solvent in the presence of water or an alcohol having up to 4 carbon atoms; converting the butene into compounds having a boiling point higher than that of 2-fluorobutane, then recovering 2-fluorbutane from the reaction solution; and purifying the recovered 2-fluorabutane by distillation.
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Paragraph 0047
(2016/06/13)
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- METHOD FOR PURIFYING 2-FLUOROBUTANE
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The present invention is a method for purifying 2-fluorobutane to obtain highly purified 2-fluorobutane through a process comprising a step for: bringing crude 2-fluorobutane containing 5-50 wt% of butenes into contact, in an aprotic polar solvent, with butenes and a brominating agent capable of forming bromonium ions in the presence of water or an alcohol having four or fewer carbon atoms; converting the butenes into compounds having higher boiling points than 2-fluorobutane, then recovering 2-fluorobutane from the reaction solution; and purifying the recovered 2-fluorobutane by distillation.
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Paragraph 0068; 0069
(2017/01/09)
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- METHOD FOR PURIFYING 2-FLUOROBUTANE
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PROBLEM TO BE SOLVED: To provide a method for efficiently removing butenes from crude 2-fluorobutane containing butenes without subjecting 2-fluorobutane to dehydrofluorination. SOLUTION: There is provided a method for purifying 2-fluorobutane to obtain highly purified 2-fluorobutane through a step comprising: bringing crude 2-fluorobutane containing 5 to 50 wt.% of butenes into contact with an aluminum-containing compound and butenes in an aliphatic hydrocarbon solvent to convert butenes into a compound having a boiling point higher than 2-fluorobutane; and then subjecting the reaction solution containing 2-fluorobutane to distillation and purification. COPYRIGHT: (C)2015,JPO&INPIT
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Paragraph 0022
(2016/12/16)
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- REACTION OF ALKYL 2-CHLORO-1,1,2-TRIFLUOROETHYL ETHERS WITH LEWIS ACIDS
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Ethyl 2-chloro-1,1,2-trifluoroethyl ether heated with boron trifluoride etherate gave ethyl fluoride and chlorofluoroacetyl fluoride.When heated with aluminium chloride, it afforded a mixture of ethyl fluoride, ethyl chloride, chlorofluoroacetyl fluoride, and chlorofluoroacetyl chloride.Treatment of the acyl halides with ethanol yielded ethyl chlorofluoroacetate.Butyl and octyl 2-chloro-1,1,2-trifluoroethyl ethers gave directly butyl and octyl chlorofluoroacetates, respectively, under similar conditions.
- Hudlicky, Milos
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p. 349 - 354
(2007/10/02)
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- REACTIONS OF CHLORINE MONOFLUORIDE. VI. RELATIVE RATES OF SUBSTITUTIVE FLUORINATION OF BROMINE-SUBSTITUTED ALKANES. HYDRIDE SHIFTS AND OTHER MIGRATIONS DURING FLUORINATION
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The relative rates of substitutive fluorination of bromoalkanes with various structures by chlorine monofluoride in a nonpolar medium at 20-40 deg C were investigated by the method of competing reactions.Halogen atoms vicinal with the substituted bromine greatly reduce the fluorination rate.The reactivity of the secondary bromides decreases in the order (CH3)2CHBr>>CH3CHBrCH2Cl>>CH2ClCHBrCH2Cl.The geminal halogen atoms have little effect on the rate of substitutive fluorination.The fluorination rates of the bromoalkanes CH2BrCH2Br, CH2BrCHClBr, and CH2BrCCl2Br are in ratios 10:3:1 respectively, while the fluorination rate of CH3CHClBr is much higher than that of CH2ClCH2Br.As a rule the debromination of primary bromides containing vicinal halogens (Br, Cl) is accompanied by migration of the latter and gives fluorides with iso structures.Hydride shifts take place in cases where stable tertiary or secondary carbocations are formed as a result of migration of the hydride; for example, the fluorination of CH3CHFCH2Br leads to the geminal difluoroalkane CH3CF2CH3.The mechanism of substitutive fluorination is discussed.
- Morozova, T. V.,Chuvatkin, N. N.,Panteleeva, I. Yu.,Boguslavskaya, L. S.
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p. 1255 - 1263
(2007/10/02)
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- Reaction of OH with CH3CH2F. The Extent of H Abstraction from the α and β Positions
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The mechanism of the reaction of OH radicals with C2H5F was determined from the yields of the reaction products.Hydroxyl radicals were generated in the gas phase by photolysis of H2O at 184.9 nm, and products were analyzed by gas chromathography and mass spectrometry.The reaction proceeds by abstraction of hydrogen primarily from the α position, and the major products were meso- and d,l-2,3-C4H8F2, 1,3-C4H8F2, 2-C4H9F, and H2.The minor products were 1,4-C4H8F2, 1-C4H9F, 1-and 2-C3H7F, C2H6, C2H4, C2H3F, and C2H2.It was found that kinetically hot H atoms formed in the photolysis of H2O abstract hydrogen to some extent at the β position of C2H5F in contrast to thermal H atoms which abstract exclusively at the α position.After correction for the effects of H atom reactions, it was estimated that 85+/-3percent of the abstraction by occurs at the α position of C2H5F.
- Singleton, Donald L.,Paraskevopoulos, George,Irwin, Robert S.
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p. 2339 - 2343
(2007/10/02)
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