Daikin Industries, Ltd.

Kazuyoshi Ichihara

Toshiya Mantani

Akinari Sugiyama

Noriyuki Shinoki

Hideki Nakaya

Yasuhide Senba

Hirokazu Aoyama

Tatsuya Ohtsuka

Takuya Arase

Kazunori Morimoto

Kenji Ishii

Takuya Ichida

Masahiro Kondou

Takeomi Hirasaka

Yuuki Matsuda

Mai Hirai

Mikio Nakagoshi

The present invention provides a novel method for producing hexafluoropropylene oxide, which can attain a high HFPO selectivity without using a phase transfer catalyst. Hexafluoropropylene (HFP), a water-soluble and aprotic organic solvent, and an aqueous solution of an oxidizing agent are introduced into a small space, thereby bringing into contact with each other and reacting hexafluoropropylene with the oxidizing agent to obtain hexafluoropropylene oxide (HFPO).

Method for producing hexafluoropropylene oxide

The present invention provides a novel method for separating hexafluoropropylene oxide (HFPO) from hexafluoropropylene (HFP), which is capable of reducing the burden on the environment. A mixture including HFPO and HFP is subjected to an extractive distillation operation using, as a solvent, at least one of a fluorine-containing saturated compound represented by the general formula CHF(wherein n, a and b are integers which satisfy: n=3 to 8, 0&#x2266;a&#x2266;2n+1, and 1&#x2266;b&#x2266;2n+2) thereby separating into a first fraction including HFPO and a second fraction including HFP and the solvent. At least one of 1-bromopropane and 2-bromopropane may be u as the solvent in place of the fluorine-containing saturated compound.

Method for separating hexafluoropropylene oxide from hexafluoropropylene

There is provided a method for separating and collecting at least alcohol with a high purity from an azeotropic mixture of olefin and alcohol. The method conducts the following steps: an azeotropic mixture crystallization step of subjecting an azeotropic mixture of alcohol and olefin represented by the formula: RfCH&#x2550;CH[wherein Rf represents a linear perfluoroalkyl group having 1 to 10 carbon atoms] to a crystallization procedure to separate the mixture into an olefin portion having a higher olefin concentration than that of the original azeotropic mixture and an alcohol portion having a higher alcohol concentration than that of the original azeotropic mixture; and an alcohol purification step of subjecting the separated alcohol portion to either a crystallization procedure or a distillation procedure to separate the alcohol portion into a low-alcohol portion having a lower alcohol concentration than that of the original alcohol portion and a high-alcohol portion having a higher alcohol concentration than that of the original alcohol portion, and thereby collecting alcohol as the high-alcohol portion.

Method for separation of olefin-alcohol azeotropic mixture

The present invention provides a method for producing a fluorine-containing halide, comprising reacting a fluorine-containing sulfonyl halide or fluorine-containing disulfonyl chloride with a metal halide or metal component in the present or absence of a solvent. In accordance with the present invention, a fluorine-containing bromide, fluorine-containing iodide or fluorine-containing chloride can be readily produced in high yield at low cost, using an industrially advantageous process.

Method for producing fluorine-containing halide

The present invention relates to a method for producing a water-soluble fluorine-containing vinyl ether which comprises subjecting a fluorine-containing 2-alkoxypropionic acid derivative represented by the following general formula (I): (wherein A represents &#x2014;OMor &#x2014;OM, and Mrepresents an alkali metal and Mrepresents an alkaline earth metal; X represents a halogen atom; Yand Yare the same or different and each represents a fluorine atom, a chlorine atom, a perfluoroalkyl group or a fluorochloroalkyl group; n represents an integer of 0 to 3, and n of Ys may be the same or different; m represents an integer of 1 to 5, and m of Ys are the same or different; and Z represents a hydrophilic group) to thermal decomposition at a temperature of not lower than 50&#xb0; C. but lower than 170&#xb0; C. in the presence of a coordinating organic solvent to give a water-soluble fluorine-containing vinyl ether represented by the general formula (II): (wherein Y, Y, Z, n and m are as defined above),

Process for the production of water-soluble fluorine-containing vinyl ethers

The present invention provides a process for producing a fluorinated fluorosulfonylalkyl vinyl ether represented by general formula (2):CF&#x2550;CFO(CFCF(CF)O)CFCFSOF&#x2003;&#x2003;(2)wherein n is an integer from 0 to 10, comprising fluorinating a perfluorovinylether sulfonate with SFand HF, the perfluorovinylether sulfonate being represented by general formula (1):CF&#x2550;CFO(CFCF(CF)O)CFCFSOM&#x2003;&#x2003;(1)wherein M is Ma or Mb, provided that Ma is an alkali metal and Mb is an alkaline earth metal; and n is as defined above. According to the process of the invention, the fluorinated fluorosulfonylalkyl vinyl ether can be produced in high yield in an industrially advantageous manner.

Process for producing fluorinated fluorosulfonylalkyl vinyl ether

The present invention provides a process for producing a fluoroalkylcarboxylic acid of the formula RfCOOH wherein Rf is a Cfluoroalkyl group, which comprises oxidizing a fluoroalkyl alcohol of the formula RfCHOH wherein Rf is as defined above using nitric acid. The process according to the present invention produces a fluoroalkylcarboxylic acid with high selectivity at low costs.

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Settsu, Japan

Kazuyoshi Ichihara