METHOD FOR PRODUCING MIXTURE OF FLUOROALKYL IODIDES

摘要

The present invention provides a novel method for producing a mixture of fluoroalkyl iodides with high production efficiency, the method enabling the production of a desired fluoroalkyl iodide with high selectivity. Specifically, the present invention provides a method for producing a mixture of fluoroalkyl iodides represented by formula (I):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒR f (CF 2 CF 2 ) n I€ƒ€ƒ€ƒ€ƒ€ƒ(I)
(wherein R f represents a fluoroalkyl group having 1 to 10 carbon atoms, and n is an integer indicating a degree of polymerization), the degree of polymerization n being m or more (m is an integer of 2 or more) by telomerization in metal catalyst-containing reactors, the method including:
(1) step 1 of reacting a fluoroalkyl iodide represented by formula (II):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒR f I€ƒ€ƒ€ƒ€ƒ€ƒ(II)
(wherein R f is a fluoroalkyl group having 1 to 10 carbon atoms) with tetrafluoroethylene in the presence of a metal catalyst in a first reactor to obtain a first reaction mixture containing a mixture of fluoroalkyl iodides represented by formula (I) wherein the degree of polymerization n is 1 or more;
(2) step 2 of separating the first reaction mixture withdrawn from the first reactor into
a first fraction containing a fluoroalkyl iodide or a mixture of fluoroalkyl iodides represented by formula (I) wherein the degree of polymerization n is (m-2) or less, a fluoroalkyl iodide represented by formula (II), and tetrafluoroethylene,
a second fraction containing a fluoroalkyl iodide represented by formula (I) wherein the degree of polymerization n is (m-1), and
a third fraction containing a mixture of fluoroalkyl iodides represented by formula (I) wherein the degree of polymerization n is m or more; and
(3) step 3 of transferring the second fraction into a second reactor in which a metal catalyst is present and reacting the second fraction with tetrafluoroethylene in the second reactor to obtain a second reaction mixture containing a mixture of fluoroalkyl iodides represented by formula (I) wherein the degree of polymerization n is m or more.