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    • 2. 发明申请
    • PROCESS FOR REMOVING CHLORINE FROM GAS STREAM
    • 从气体流中除去氯化物的方法
    • WO1998025689A1
    • 1998-06-18
    • PCT/GB1997003175
    • 1997-11-19
    • IMPERIAL CHEMICAL INDUSTRIES PLCSTITT, Edmund, HughHANCOCK, Frederick, Ernest
    • IMPERIAL CHEMICAL INDUSTRIES PLC
    • B01D53/68
    • B01D53/1425B01D53/68
    • Chlorine is scrubbed from a chlorine-containing gas using an aqueous feed liquor containing an excess of alkali to give an effluent liquor containing chloride and hypochlorite ions. The effluent liquor is recycled as part or all of the aqueous feed liquor. For at least part of the time, at least part of the effluent liquor is passed through a fixed bed of a catalyst for the decomposition of hypochlorite ions whereby hypochlorite ions are decomposed to oxygen gas and chloride ions. The resultant catalyst-treated liquor is mixed with the remainder, if any, of the effluent liquor and recycled, optionally together with added fresh alkali solution, as the aqueous feed liquor. Part of the effluent liquor is optionally discharged as a purge stream before or after passage through catalyst bed. The process may be operated in a continuous mode or in a semi-continuous mode wherein a reservoir holding the liquor to be recycled is periodically discharged, preferably through the catalyst bed, and then recharged with fresh alkali solution. Altternatively two reservoirs may be employed with one supplying the aqueous feed liquor while the other is being discharged and replenished. In the latter case, the reservoir being discharged may have its liquor discharged through the catalyst bed.
    • 使用含有过量碱的含水原料液从含氯气体中洗涤氯,得到含有氯化物和次氯酸根离子的废液。 流出液被回收作为部分或全部含水进料液。 在至少部分时间内,至少部分废液通过催化剂的固定床,以分解次氯酸根离子,从而将次氯酸根离子分解成氧气和氯离子。 将得到的催化剂处理的液体与其余的(如果有的话)的流出液混合,并且任选地与添加的新鲜碱溶液一起再循环,作为含水进料液。 在通过催化剂床之前或之后,部分流出液可任选地作为吹扫流排出。 该方法可以以连续模式或半连续模式操作,其中保持待循环液体的储存器周期性排出,优选通过催化剂床排出,然后用新鲜碱溶液再充电。 或者,可以使用两个储存器,一个供应水性进料液,另一个被排出并补充。 在后一种情况下,被排出的储存器可以使其液体通过催化剂床排出。