IMPROVED METHOD FOR PRODUCING 2,3,3,3-TETRAFLUOROPROPENE

• Main Authors: JEFFREY BALL, CHIU YUON, HALUK KOPKALLI, PHILIP L DA PRATO, SUN XUEHUI, WANG HAIYOU, MARIO JOSEPH NAPPA, TUNG HSUEH SUNG, GUSTAVO CERRI
• Format: Patent
• Language: English; Japanese
• Published: 11.01.2018
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

PROBLEM TO BE SOLVED: To provide a raw material adjustment method for increasing a conversion ratio from 2-chloro-1,1,1,2-tetrafluoropropane into 2,3,3,3-tetrafluoropropene (HFO-1234yf).SOLUTION: A method for forming a dehydrochlorination starting material having a comparatively low concentration of 2-chloro-3,3,3-trifluoropropene includes: separating 2-chloro-1,1,1,2-tetrafluoropropane from 1,1,2-trichloro-3,3,3- trifluoropropane produced by photochlorination of a starting composition containing 2-chloro-1,1,1,2-tetrafluoropropane and 2-chloro-3,3,3-trifluoropropene; and treating the resultant substance with a solid absorbent and distilling the resultant substance under the presence of HF.SELECTED DRAWING: None 【課題】２−クロロ−１，１，１，２−テトラフルオロプロパンから２，３，３，３−テトラフルオロプロペン（ＨＦＯ−１２３４ｙｆ）への転化率を増加させるための原料調整方法の提供。【解決手段】２−クロロ−１，１，１，２−テトラフルオロプロパン及び２−クロロ−３，３，３−トリフルオロプロペンを含む出発組成物を光塩素化して生じた１，１，２−トリクロロ−３，３，３−トリフルオロプロパンから２−クロロ−１，１，１，２−テトラフルオロプロパンを分離後、さらに固体吸着剤による処理、ＨＦ存在下の蒸留を経て、２−クロロ−３，３，３−トリフルオロプロペンの比較的低い濃度を有する脱塩化水素化出発材料を形成する方法。【選択図】なし