Continuous production equipment and process for hexafluoropropylene oxide oligomer

Abstract

The invention provides continuous production equipment and a continuous production process for a hexafluoropropylene oxide oligomer. The continuous production equipment comprises a stirring kettle anda liquid phase separation kettle, wherein a stirrer is arranged in the stirring kettle; a discharge pipe is arranged at the bottom of the stirring kettle; a discharge pipe is arranged at the bottom of the liquid phase separation kettle; the discharging pipe is communicated with the discharge pipe through a feeding pipe; the feeding pipe is provided with a conveying pump; the top of the stirring kettle is communicated with the top of the liquid-phase separation kettle through a liquid-phase circulating pipe and a gas-phase circulating pipe respectively; the liquid-phase circulating pipe is provided with a circulating pump; the gas-phase circulating pipe is provided with a condenser; one end of the liquid-phase circulating pipe, which is positioned at the liquid-phase separation kettle, extends into the lower part of the liquid-phase separation kettle; and one end of the liquid-phase circulating pipe, which is positioned at the stirring kettle, is connected with a nozzle. The equipmentand the process have the advantages of continuous production, simplicity in operation, high production efficiency, stable product quality and the like, meanwhile, the catalyst, the solvent and byproducts can be recycled, and the process is low in cost and environmentally friendly.

Description

【Technical field】 [0001] The invention specifically relates to a continuous method production equipment and technology of hexafluoropropylene oxide oligomer. 【Background technique】 [0002] Hexafluoropropylene oxide (HFPO) is an important fluorine chemical raw material, and its downstream products are widely used in the fields of chemical engineering, new energy, new materials, pharmaceuticals and pesticides, electronics and semiconductors. Oligomers (mainly dimers and trimers) of hexafluoropropylene oxide, as important fluorine-containing intermediates, have important applications in many fields. For example, hexafluoropropylene oxide dimer is the raw material for the preparation of fluorine-containing monomer perfluoropropyl vinyl ether (PPVE), which is widely used as a fluorine-containing monomer in the production of fusible fluorine-containing plastics PFA and fluorine rubber. Production. As another example, hexafluoropropylene oxide trimer is the raw material for the ...

AI Technical Summary

Problems solved by technology

However, this batch production process has the following disadvantages: a) the long standing time of the light and heavy components of the reaction product leads to a long production cycle and low production efficiency; To precise phase separation, part of the catalyst will be discharged together with the crude product or part of the crude product will remain in the reactor, which will easily cause fluctuations in product quality; c) for some catalytic systems, low-boiling by-products will be generated during the reaction, and the latter is difficult Recycling leads to large consumption of raw materials and high production costs; d) intermittent operation has many steps, troublesome operation, and high quality requirements for production workers, so the manufacturing cost increases

The device disclosed by the invention can increase the yield of hexafluoropropylene oxide oligomers, but the design is complex, the manufacturing cost is high, and the process operation is cumbersome and difficult

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