US 2013/0096353 A1Published application

Process for producing fluoroalkyl iodide

AssigneeAsahi Glass Company, Limited

InventorsTetsuo OTSUKA, Shoji Furuta

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Abstract

To provide a process for producing a fluoroalkyl iodide, whereby the selectivity for a fluoroalkyl iodide having a desired degree of polymerization is high and the productivity is high. A process for producing a fluoroalkyl iodide (2) represented by RfCF2CF2I (wherein Rf is a fluoroalkyl group having at most 4 carbon atoms), which comprises reacting a fluoroalkyl iodide (1) represented by RfI with tetrafluoroethylene in the presence of a radical initiator, wherein a first reaction step of supplying and reacting tetrafluoroethylene and a radical initiator to the fluoroalkyl iodide (1), is followed by repeating (n−1) times (provided that n is an integer of at least 3) a subsequent reaction step of supplying and reacting a radical initiator, or a radical initiator and tetrafluoroethylene, to a reaction mixture (1) formed in the first reaction step.

Claims18

Dependent claims

A process for producing a fluoroalkyl iodide (2) represented by the following formula (2), which comprises reacting a fluoroalkyl iodide (1) represented by the following formula (1) with tetrafluoroethylene in the presence of a radical initiator:

RfI (1)
RfCF2CF2I (2)
wherein Rf is a fluoroalkyl group having at most 4 carbon atoms, wherein
by a first reaction step of supplying and reacting tetrafluoroethylene and a radical initiator to the fluoroalkyl iodide (1), followed by a second reaction step of supplying and reacting a radical initiator, or a radical initiator and tetrafluoroethylene, to a reaction mixture (1) formed in the first reaction step, a reaction mixture (2) comprising the fluoroalkyl iodide (1) and the fluoroalkyl iodide (2) is produced,
the maximum amount of tetrafluoroethylene present in each reaction step is maintained to be within a range of from 0.01 to 10 mol % to the total number of moles of the fluoroalkyl iodide (1) and the fluoroalkyl iodide (2),
the maximum amount of the radical initiator present in each reaction step is adjusted to be from 0.0005 to 0.5 mol % to the total number of moles of the fluoroalkyl iodide (1) and the fluoroalkyl iodide (2), and
the conversion of the fluoroalkyl iodide (1) in the reaction mixture (2) after completion of the second reaction step is adjusted to be at most 10%.

4 more elements

RfI (1)
RfCF2CF2I (2)
wherein Rf is a fluoroalkyl group having at most 4 carbon atoms, wherein
by a first reaction step of supplying and reacting tetrafluoroethylene and a radical initiator to the fluoroalkyl iodide (1), followed by a total of n reaction steps by repeating (n−1) times (provided that n is an integer of at least 3) a subsequent reaction step of supplying and reacting a radical initiator, or a radical initiator and tetrafluoroethylene, to a reaction mixture (n−1) formed in the preceding reaction step, a reaction mixture (n) comprising the fluoroalkyl iodide (1) and the fluoroalkyl iodide (2) is produced,
the maximum amount of tetrafluoroethylene present in each reaction step is maintained to be within a range of from 0.01 to 10 mol % to the total number of moles of the fluoroalkyl iodide (1) and the fluoroalkyl iodide (2),
the maximum amount of the radical initiator present in each reaction step is adjusted to be from 0.0005 to 0.5 mol % to the total number of moles of the fluoroalkyl iodide (1) and the fluoroalkyl iodide (2), and
the conversion of the fluoroalkyl iodide (1) in the reaction mixture (n) after completion of the n-th reaction step is adjusted to be at most 10%.

4 more elements

Dependencies are inferred from the claim text.