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2. 发明授权

US4264530A Process for preparing high purity tetrafluoromethane 失效
标题翻译：制备高纯度四氟甲烷的方法
公开(公告)号：US4264530A
公开(公告)日：1981-04-28
申请号：US124271
申请日：1980-02-25
申请人： Yohnosuki Ohsaka , Heikitsu Sonoyama
发明人： Yohnosuki Ohsaka , Heikitsu Sonoyama
IPC分类号： B01J27/00 , C07C17/00 , C07C17/20 , C07C17/38 , C07C19/08 , C07C67/00
CPC分类号： C07C19/08 , C07C17/206 , C07C17/38
摘要： A process for preparing high purity tetrafluoromethane which comprises the steps of (a) passing a gaseous mixture of chlorotrifluoromethane and hydrogen fluoride in a molar proportion of 1:1 to 1:10 through a catalyst layer of chromium oxyfluoride at a temperature of 380.degree. to 420.degree. C. under a pressure of 1 to 5 atm with a space velocity of 10 to 150 hr.sup.-1, (b) washing the gaseous reaction mixture obtained in the foregoing step (a) with water or an aqueous alkaline solution so as to remove acidic materials therefrom, (c) passing the resultant gaseous mixture with hydrogen fluoride in an amount of 0.2 to 10 mole to 1 mole of the combined amount of chlorotrifluoromethane and tetrafluoromethane in the gaseous mixture through a catalyst layer of chromium oxyfluoride at a temperature of 380.degree. to 420.degree. C. under a pressure of 1 to 5 atm with a space velocity of 10 to 300 hr.sup.-1 and (d) washing the gaseous reaction mixture obtained in the foregoing step (c) with water or an aqueous alkaline solution so as to remove acidic materials therefrom, optionally followed by effecting the same operations as in the latter two steps repeatedly one or more times until a desired purity of tetrafluoromethane is obtained.
摘要翻译：一种制备高纯度四氟甲烷的方法，包括以下步骤：（a）将氟三氟甲烷和氟化氢的摩尔比例为1:1至1:10的气体混合物通过氟氧化铬催化剂层在380℃至 420℃，空气速度为10〜150小时-1的压力下，（b）用水或碱性水溶液洗涤上述步骤（a）中得到的气态反应混合物，以便从中除去酸性物质，（c）使得到的气态混合物与氟化氢的摩尔比为0.2〜10摩尔至气体混合物中氯三氟甲烷和四氟甲烷的组合量的1摩尔，通过氟氧化铬催化剂层，温度为 380〜420℃，空速为10〜300小时-1的压力下，（d）用上述步骤（c）得到的气态反应混合物用水或碱性碱 e溶液以除去其中的酸性物质，任选地随后进行与后两步相同的操作，反复进行一次或多次，直到获得所需的四氟甲烷纯度。

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