| 摘要 |
Liquid hydrogen iodide is decomposed to form hydrogen and iodine in the presence of water using a soluble catalyst. Decomposition is carried out at a temperature between about 350 DEG K. and about 525 DEG K. and at a corresponding pressure between about 25 and about 300 atmospheres in the presence of an aqueous solution which acts as a carrier for the homogeneous catalyst. Various halides of the platinum group metals, particularly Pd, Rh and Pt, are used, particularly the chlorides and iodides which exhibit good solubility. After separation of the H2, the stream from the decomposer is countercurrently extracted with nearly dry HI to remove I2. The wet phase contains most of the catalyst and is recycled directly to the decomposition step. The catalyst in the remaining almost dry HI-I2 phase is then extracted into a wet phase which is also recycled. The catalyst-free HI-I2 phase is finally distilled to separate the HI and I2. The HI is recycled to the reactor; the I2 is returned to a reactor operating in accordance with the Bunsen equation to create more HI.
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