PROCESS FOR PRODUCING 2,3,3,3-TETRAFLUOROPROPENE

• Main Authors: WANG HAIYOU, TUNG HSUEH SUNG, MERKEL DANIEL C
• Format: Patent
• Language: English; Japanese
• Published: 18.01.2018
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; ADHESIVES; CHEMISTRY; DYES; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC CHEMISTRY; PAINTS; POLISHES

PROBLEM TO BE SOLVED: To provide an economic means of producing hydrofluoroolefins, such as HFO-1234yf.SOLUTION: The present invention relates, in part, to the surprising discovery that, during the dehydrochlorination of 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) to 2,3,3,3-tetrafluoropropene (HFO-1234yf) in a reactor, impurities formed through halidation of the materials of the reactor leads to a reduction of the HFO-1234yf production rate and/or selectivity changeover from HFO-1234yf to 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf). Accordingly, the present invention relates to methods of improving HFO-1234yf production and selectivity by reducing the presence of impurities in the reactor and avoiding, or at least reducing, the formation of HCFO-1233xf.SELECTED DRAWING: Figure 1 【課題】ＨＦＯ−１２３４ｙｆのようなヒドロフルオロオレフィンを製造する経済的な手段の提供。【解決手段】反応器内で２−クロロ−１，１，１，２−テトラフルオロプロパン（ＨＣＦＣ−２４４ｂｂ）を２，３，３，３−テトラフルオロプロペン（ＨＦＯ−１２３４ｙｆ）へ脱塩化水素化する間に、反応器の材料のハロゲン化によって形成される不純物が、ＨＦＯ−１２３４ｙｆの生成速度の減少、及び／又はＨＦＯ−１２３４ｙｆからＨＣＦＯ−１２３３ｘｆへの選択率の逆転を引き起こす。したがって、反応器内の不純物の存在を減少させ、ＨＣＦＯ−１２３３ｘｆの形成を回避するか又は少なくとも減少させることによってＨＦＯ−１２３４ｙｆの生成及び選択率を向上させる方法。【選択図】図１