SEPARATION OF CLOSE BOILING COMPOUNDS BY ADDITION OF THIRD COMPOUND

• Main Authors: HSUEH S TUNG, PHAM HANG T, SINGH RAJIV R, KONSTANTIN A POKROVSKI, MERKEL DANIEL C
• Format: Patent
• Language: English; Japanese
• Published: 31.03.2016
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

PROBLEM TO BE SOLVED: To provide a method for separating a plurality of halocarbons in an azeotropic composition.SOLUTION: In one embodiment, 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) is separated from 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) by adding hydrogen fluoride (HF) as a third component and then separating via conventional distillation. More specifically, the invention pertains to a method for separating HCFC-244bb from HCFO-1233xf by forming a ternary azeotrope of HCFC-244bb, HCFO-1233xf and HF and distilling it from the solution such that a portion of HCFC-244bb remains in the solution while substantially all of HCFO-1234xf is removed. It is useful as an intermediate in production of 2,3,3,3-tetrafluoropropene (HFO-1234yf).SELECTED DRAWING: None 【課題】共沸組成物中の複数のハロカーボンを分離する方法の提供。【解決手段】第３の成分としてフッ化水素（ＨＦ）を加え、次に通常の蒸留によって分離することによって、２−クロロ−３，３，３−トリフルオロプロペン（ＨＣＦＯ−１２３３ｘｆ）から２−クロロ−１，１，１，２−テトラフルオロプロパン（ＨＣＦＣ−２４４ｂｂ）を分離する。より詳しくは、ＨＣＦＣ−２４４ｂｂとＨＣＦＯ−１２３３ｘｆとＨＦの三元共沸混合物として、溶液から蒸留し、ＨＣＦＣ−２４４ｂｂが溶液中に一部残留し、ＨＣＦＯ−１２３４ｘｆを実質的に全て除し、ＨＣＦＣ−２４４ｂｂをＨＣＦＯ−１２３３ｘｆから分離する方法。２，３，３，３−テトラフルオロプロペン（ＨＦＯ−１２３４ｙｆ）を製造する中間体として有用である。【選択図】なし