SEPARATION OF COMPOUND HAVING CLOSE BOILING POINT 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: 21.12.2017
• 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: A separation method includes; adding a third component to first halocarbon and second halocarbon to form a ternary azeotropic composition; and remaining a part of the first halocarbon and removing substantially all of the second halocarbon. Specifically, the method includes: adding the third component to the binary azeotropic composition; and separating 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) from 2-chloro-3,3,3-tetrafluoropropene (HCFC-1233xf), by normal distillation. More specifically, the method includes: distilling the ternary azeotropic composition containing the third component to separate HCFC-244bb from HCFC-1233xf (which is useful as intermediate body 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１のハロカーボンと第２のハロカーボンに第３成分を加えて、３元共沸混合物を形成して、第一のハロカーボンの一部が残留し、第二のハロカーボンを実質的に全部除去する分離方法。具体的には、第３の成分を二元共沸混合物に加え、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（ＨＣＦＣ−１２３３ｘｆ）から２−クロロ−１，１，１，２−テトラフルオロプロパン（ＨＣＦＣ−２４４ｂｂ）を分離する方法。より詳しくは、第３の成分を含む三元共沸混合物を蒸留して、ＨＣＦＣ−２４４ｂｂをＨＣＦＣ−１２３３ｘｆから分離する（これらは２，３，３，３−テトラフルオロプロペン（ＨＦＯ−１２３４ｙｆ）の製造における中間体として有用である）方法。【選択図】なし