Method for preparing perfluoroalkyl iodine through catalytic distillation telomerization
A perfluoroalkyl iodide, catalytic distillation technology, applied in chemical instruments and methods, preparation of halogenated hydrocarbons, chemical industry, etc., can solve problems affecting the normal operation of industrial devices, catalysts cannot be recycled, and copper powder catalyst particles are small , to achieve the effect of avoiding hydrogen-containing by-products, avoiding the difficulty of solid-liquid separation, and simple production equipment
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Embodiment 1
[0027] The inner diameter of the catalytic distillation tower is φ1000mm, and the reaction section 2 is divided into three sections, and each section is filled with phosphor bronze wire mesh corrugated packing. Xianghuaxing Chemical Equipment Packing Co., Ltd. Production, model 125, specific surface area 125m 2 / m 3 , According to the mass percentage content composition is: tin 2%, phosphorus 0.4%, lead 0.08%, the rest is copper) 2m high, C 2 F 5 I was continuously added from the upper distillation section 1 of the reaction section 2, and gas-phase tetrafluoroethylene was continuously added from the stripping section 3 at the lower portion of the reaction section 2. The reaction conditions are: C 2 F 5 The molar ratio of I to tetrafluoroethylene is 1:5; the reaction pressure is 1.0MPa; the temperature of the reaction section is 70°C, the low-boiling fraction containing tetrafluoroethylene is extracted from the top of the tower, and the crude perfluoroalkyl iodide is continuously...
Embodiment 2
[0029] The inner diameter of the catalytic distillation tower is φ1000mm, and the reaction section 2 is divided into five sections, and each section is filled with phosphor bronze wire mesh corrugated packing. Xianghuaxing Chemical Equipment Packing Co., Ltd. Production, model 250, specific surface area 250m 2 / m 3 , According to the mass percentage content composition: tin 3%, phosphorus 0.3%, lead 0.05%, the rest is copper) 1m high, C 2 F 5 I was continuously added from the upper distillation section 1 of the reaction section 2, and gas-phase tetrafluoroethylene was continuously added from the stripping section 3 at the lower portion of the reaction section 2. The reaction conditions are: C 2 F 5 The molar ratio of I to tetrafluoroethylene is 1:3; the reaction pressure is 0.8MPa; the temperature of the reaction section is 80°C, the low-boiling fraction containing tetrafluoroethylene is extracted from the top of the tower, and the crude perfluoroalkyl iodide is continuously dis...
Embodiment 3
[0031] The inner diameter of the catalytic distillation tower is φ1000mm, the reaction section 2 is divided into one section, and each section is filled with phosphor bronze wire mesh corrugated packing. Xianghuaxing Chemical Equipment Packing Co., Ltd. Production, model 500, specific surface area 500m 2 / m 3 ,According to the mass percentage content, the composition is: tin 4%, phosphorus 0.2%, lead 0.1%, the rest is copper) 5m high, C 2 F 5 I was continuously added from the upper distillation section 1 of the reaction section 2, and gas-phase tetrafluoroethylene was continuously added from the stripping section 3 at the lower portion of the reaction section 2. The reaction conditions are: C 2 F 5 The molar ratio of I to tetrafluoroethylene is 1:7; the reaction pressure is 0.6MPa; the temperature of the reaction section is 85°C, the low-boiling fraction containing tetrafluoroethylene is extracted from the top of the tower, and the crude perfluoroalkyl iodide is continuously dis...
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