CSSC Special Gases: Patent for “A Method for Purifying Electronic-Grade Hexafluorobutadiene Based on Extraction Distillation Technology” Granted

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CSIC Special Gases: Patent for “A Method of Purifying Electronic-Grade Hexafluorobutadiene Using Extraction Distillation Technology” Granted On March 3, information from the **Intellectual Property Office shows that CSIC (Handan) Pairei Special Gases Co., Ltd. received approval for its patent titled “A Method of Purifying Electronic-Grade Hexafluorobutadiene Using Extraction Distillation Technology.” The approval notice has the number CN116903438B, and the application was filed in June 2023. The patent abstract states that this application falls within the field of chemical engineering and relates to the purification of hexafluorobutadiene; specifically, it concerns a method for purifying electronic-grade hexafluorobutadiene using extraction distillation technology. The method includes the following steps: (1) Extractive distillation: The crude hexafluorobutadiene, together with the extractant, is fed into the extractive distillation column ； (II) Adsorption: The hexafluorobutadiene obtained after extractive distillation in step (I) is fed into an adsorption tower containing an adsorbent, thereby yielding hexafluorobutadiene ； The aforementioned adsorbent is an oxidized graphene adsorbent modified by the doping of organic bases and copper salts. This process first involves extractive distillation, followed by the use of doped graphene oxide adsorbents to efficiently adsorb azeotropic fluorinated olefin compounds and alcoholic impurities. It features simple steps and high product purity, meeting the requirements of the chemical vapor deposition industry for hexafluorobutadiene in the production of insulating films with low resistivity ； At the same time, this process is carried out at low temperature and pressure, which prevents hexafluorobutadiene from undergoing thermal rearrangement and isomerization; it requires minimal equipment, making large-scale production feasible.