Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
  • C07C29/132—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen containing functional group
  • C07C29/136—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen containing functional group of >C=O containing groups, e.g. —COOH
  • C07C29/143—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen containing functional group of >C=O containing groups, e.g. —COOH of ketones
  • C07C29/145—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen containing functional group of >C=O containing groups, e.g. —COOH of ketones with hydrogen or hydrogen-containing gases
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
  • C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
  • C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
  • C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
  • C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
  • C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation

Definitions

• This invention relates to a process for purifying 1,1,1, 3,3, 3-hexafluoroisopropanol.
• HFIP 1,1,1,3,3,3-hexafluoroisopropanol
• HFIP can also be used as a solvent for many different types of polymers. HFIP is also used to prepare fluorinated esters of polyacrylate and polymethacrylate polymers, and to
• HFIP can be prepared from 1,1,1,3,3,3-hexafluoroacetone (HFA) by catalytic reduction according to the following scheme:
• the hydrogenation catalyst is usually a nickel, palladium, ruthenium, rhodium or platinum metal, or a compound containing one or more of these metals.
• a byproduct of the catalytic reduction is 1,1,1-trifluoroacetone (TFA), which is very difficult to separate from the HFIP.
• TFA 1,1,1-trifluoroacetone
• the reduction step (a) is carried out substantially as is well known in the art.
• hydrogenation catalyst can be any suitable catalyst provided, of course, that the reduction of the HFA produces a product mixture comprising both HFIP and TFA. As indicated above,
• catalysts useful in this regard include nickel, palladium, ruthenium, rhodium and platinum metal catalysts, and compounds containing one or more of these metals, for example, a palladium on carbon catalyst, particularly, a 2% palladium on carbon catalyst.
• the product of the reduction step (a) is a product mixture comprising both HFIP and TFA.
• the TFA is initially present in such product mixture in an undesirable or significant
• This product mixture will be subjected to purification process (b), and the result is that the TFA content will be reduced, and the HFIP can thereafter be recovered substantially free of TFA.
• substantially free of TFA is meant that the HFIP will contain less than 500 ppm, less than 200 ppm or less than 100 ppm of TFA.
• step (a) the product mixture obtained from step (a), with or without intermediate work-up, is further reduced with hydrogen in the presence of a second
• the second hydrogenation catalyst is usually the same as the first hydrogenation catalyst as this is easier, but the second hydrogenation catalyst could be
• the first hydrogenation catalyst is a palladium on carbon catalyst, particularly, a 2% palladium on
• the second hydrogenation catalyst may also be a palladium on carbon catalyst, particularly a 2% palladium on carbon catalyst, or else the second hydrogenation
• the catalyst may be different from the first hydrogenation catalyst.
• the product mixture obtained from step (a), with or without intermediate work-up is cooled to a temperature at which the HFIP freezes and the TFA remains liquid.
• HFIP has a high melting point (-4°C) compared to TFA (-78°C).
• HFIP substantially free of TFA can be obtained by cooling the product mixture obtained from step (a) to a temperature between about -4°C and about -78°C. The frozen HFIP can be separated
• reactants or separately added to the reduction step (a) and/or HF can be added to the product mixture obtained from step (a), with or without intermediate work-up, under conditions wherein at least some of the HF forms a high boiling complex with TFA and some of the
• HFIP formed in step (a) and HFIP substantially free of TFA is separated from said high boiling complex by fractional distillation.
• the third purification process
• step (a) involves adding HF to the product mixture obtained from step (a) in a ratio of hydrofluoric acid:product mixture of from about 1 :99 to about 1 : 19, so that the amount of HF is about 1 to
• step (a) is a fourth purification process.
• HF-free conditions can be established by any suitable technique
• the present invention also relates to a second
• second inventive process comprises the steps of:
• the present invention also includes processes wherein two or more of steps (b)(i)-(b)(iv) are carried out.
• a product mixture comprising HFIP, HF and a small amount of TFA is purified

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Priority Applications (9)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34860222

Family Applications (1)

Country Status (11)

Cited By (2)

Families Citing this family (5)

Citations (2)

Family Cites Families (3)

• 2005
  • 2005-02-04 US US10/599,472 patent/US7659433B2/en not_active Expired - Fee Related
  • 2005-02-04 ES ES05706171T patent/ES2353389T3/es not_active Expired - Lifetime
  • 2005-02-04 KR KR1020067017438A patent/KR101321760B1/ko not_active Expired - Fee Related
  • 2005-02-04 CA CA2555653A patent/CA2555653C/en not_active Expired - Fee Related
  • 2005-02-04 JP JP2006552229A patent/JP5048342B2/ja not_active Expired - Fee Related
  • 2005-02-04 EP EP05706171A patent/EP1711449B1/en not_active Expired - Lifetime
  • 2005-02-04 AT AT05706171T patent/ATE486833T1/de not_active IP Right Cessation
  • 2005-02-04 WO PCT/US2005/003366 patent/WO2005077873A1/en not_active Ceased
  • 2005-02-04 BR BRPI0507454-1A patent/BRPI0507454B1/pt not_active IP Right Cessation
  • 2005-02-04 CN CN2005800086745A patent/CN1934060B/zh not_active Expired - Fee Related
  • 2005-02-04 EP EP10189687.6A patent/EP2275396B1/en not_active Expired - Lifetime
  • 2005-02-04 DE DE602005024516T patent/DE602005024516D1/de not_active Expired - Lifetime

Patent Citations (2)

Also Published As

Similar Documents

Legal Events