METHOD OF PRODUCING DIIODOPERFLUOROBUTANE Russian patent published in 2011 - IPC C07C17/278 C07C19/16 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing 1,4-diiodoperfluorobutane by reacting 1,2-diidoperfluroethane with tetrafluoroethylene, which involves heating 1,2-diidoperfluorethane, feeding tetrafluoroethylene into a reactor with 1,2-diiodoperfluoroethane, holding the obtained mixture at high temperature and pressure. The process is carried out in two steps: at the first step, temperature of the process is equal to 180-200°C and pressure of tetrafluoroethylene in the reactor is equal to 1.3-1.7 MPa, and at the second step, temperature in the reactor is equal to 150-170°C and pressure in the reactor is equal to 0.7-1.0 MPa. The obtained crude 1,4-diiodoperfluorobutane undergoes fractionation at low pressure to extract the 1,2-diiodoperfluoroethane fraction which is returned to the step for producing 1,4-diiodoperfluorobutane, and the fraction of the desired product.

EFFECT: high selectivity of the process with respect to 1,4-diiodoperfluorobutane, possibility of conducting the process without the intermediate operation for removing gaseous products during synthesis, and low consumption of raw materials.

2 cl, 6 ex