METHOD OF PRODUCING FLUORINATED ALKANES Russian patent published in 2012 - IPC C07C17/354 C07C19/08 C07C19/10 C07C19/14 C07C19/16 

FIELD: chemistry.

SUBSTANCE: invention relates to versions of a method of producing a fluorinated alkane. One of the versions comprises the following steps: (a) bringing at the first reaction step, a source stream containing fluorinated olefin and hydrogen into contact with a first amount of catalyst to obtain at least a first effluent stream containing fluorinated alkane, unreacted fluorinated olefin and hydrogen. The fluorinated olefin is fed to the first reaction step at a rate which is at least 60% higher than the throughput of the catalyst at the first reaction step, and results in the conversion of fluorinated olefin to fluorinated alkane which ranges from 10 to 60%. Then (b) at one or more additional reaction steps, bringing the effluent stream into contact with a second amount of catalyst to obtain fluorinated alkane, wherein the second amount is an amount for achieving conversion of the fluorinated olefin which is higher than the conversion of fluorinated olefin at the first reaction step (a), where the fluorinated olefin is a compound of formula (I): (CX_nY_3-n)(CR¹ _aR² _b)_zCX=CH_mX_2-m (I) and the fluorinated alkane is a compound of formula (II): (CX_nY_3-n(CR¹ _aR² _b)_zCHXCH₂X (II), where: each X independently denotes Cl, F, I or Br; each Y independently denotes H, Cl, F, I or Br; each R¹ independently denotes H, Cl, F, I or Br or an unsubstituted or halogen-substituted methyl or ethyl radical; each R² independently denotes H, Cl, F, I, Br or an unsubstituted or halogen-substituted methyl or ethyl radical; n equals 1, 2 or 3; a and b are each equal to 1 of 2, provided that a+b=2; m equals 0, 1 or 2; and Z equals 0, 1, 2 or 3.

EFFECT: use of the present invention enables to simultaneously achieve high efficiency and selectivity.

14 cl, 2 ex, 2 dwg