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    • 5. 发明公开
    • METHOD FOR REPLACEMENT OF PHOSGENE SYNTHESIS COLUMN CATALYST
    • 磷合成柱催化剂替代方法
    • EP3243563A1
    • 2017-11-15
    • EP15876495.1
    • 2015-01-16
    • Wanhua Chemical Group Co., Ltd.
    • ZHANG, HongkeYAO, YuZHAO, DongkeCAO, GuanyiLIU, XiaogaoCAO, YounianLI, ChongMA, Yabo
    • B01J8/06
    • The present invention discloses a method of quickly desorbing phosgene from a catalyst in a phosgene synthesizing tower when the catalyst in the phosgene synthesizing tower is replaced. The method is carried out by first purging out easily-desorbed phosgene from the catalyst activated carbon in the phosgene synthesizing tower with nitrogen gas, then purging with ammonia gas, and the ammonia gas is reacted with the hardly-desorbed phosgene in the catalyst of the phosgene synthesizing tower. Then the phosgene synthesizing tower is rinsed with a water gun and then dried with hot gas. The phosgene content at an outlet of the phosgene synthesizing tower after purging is below 0.5 ppm, which can significantly save the time of the phosgene synthesizing tower for purging the phosgene, greatly reduce the amount of nitrogen gas consumed, and improve the safety of the process operation.
    • 本发明公开了一种在光气合成塔中的催化剂被更换时,从光气合成塔中的催化剂快速解吸光气的方法。 该方法首先用氮气从光气合成塔中的催化剂活性炭中清除容易脱附的光气,然后用氨气吹扫,并使氨气与催化剂中的难解吸的光气在 光气合成塔。 然后用水枪冲洗光气合成塔,然后用热气干燥。 净化后光气合成塔出口处的光气含量低于0.5ppm,可大大节省光气合成塔净化光气的时间,大大减少氮气消耗量,提高工艺安全性 操作。