Tetrafluoroethylene (TFE) refining method

Abstract

The invention provides a tetrafluoroethylene (TFE) refining method, which comprises the following steps of 1, conveying TFE production pyrolysis gas into a first separation tower to be separated; recovering TFE from tower top gas of the first separation tower; introducing coarse gas of the first separation tower into a rectification tower after the coarse gas of the first separation tower is exhausted from the middle part of the first separation tower; enabling tower kettle liquid of the first separation tower to enter a heavy ingredient recovery system; 2, after the coarse gas of the first separation tower enters the rectification tower to be subjected to rectification, obtaining TEF monomers from the tower top of the rectification tower; enabling tower kettle liquid of the rectification to enter a second separation tower. The TFE refining method has the beneficial effects that the first separation tower middle part side line production scheme is used; light ingredients are produced from the tower top of the first separation tower and enter a TFE recovery system for recovering TFE and then discharging light ingredients; middle part side line TFE coarse gas enters the rectification tower, and the TFE monomers with the purity being greater than 99.9999 percent can be obtained from the tower top of the rectification tower.

Description

technical field [0001] The invention relates to the technical field of tetrafluoroethylene purification, in particular to a method for refining high-purity tetrafluoroethylene. Background technique [0002] Such as figure 1 Shown, the cracking gas TFE (being tetrafluoroethylene) rectification flow process in the traditional tetrafluoroethylene production is, the first separation tower removes light components and reclaims TFE monomer, and tower bottom liquid enters rectification tower, from tower top To purify TFE monomer, the liquid in the bottom of the tower enters the second separation tower, separates Y3 (i.e. trifluoroethylene), recycles TFE, and the liquid in the bottom of the second separation tower enters the heavy component recovery system, which is difficult to improve the purity of TFE and consumes a lot of energy. All equipment, including the main line of rectification, has risks of high toxicity hazards such as octafluoroisobutene. [0003] The specific perfor...

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Problems solved by technology

[0002] like figure 1 Shown, the cracking gas TFE (being tetrafluoroethylene) rectification flow process in the traditional tetrafluoroethylene production is, the first separation tower removes light components and reclaims TFE monomer, and tower bottom liquid enters rectification tower, from tower top To purify TFE monomer, the liquid in the bottom of the tower enters the second separation tower, separates Y3 (i.e. trifluoroethylene), recycles TFE, and the liquid in the bottom of the second separation tower enters the heavy component recovery system, which is difficult to improve the purity of TFE and consumes a lot of energy. All equipment, including the main line of rectification, has the risk of high toxicity hazards such as octafluoroisobutene

[0003] The specific performance is: it is difficult to improve the purity of TFE, and there are a large number of heavy components such as R22 (ie difluorochloromethane) in the rectification tower, occupying a large amount of equipment space, which limits the further improvement of the purity of TFE;

[0004] Large energy consumption, a large amount of R22 and other heavy components are repeatedly distilled in the rectification tower and the second separation tower, consuming a lot of energy;

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