| 摘要 |
<p>1384095 Preparation of hydrogen sulphide SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ NV 27 March 1972 [29 March 1971] 14262/72 Heading C1A The total sulphur content of Claus off-gases is decreased by passing them at a temperature above 175‹ C. together with hydrogen and carbon monoxide, over a Group VI and/or a Group VIII metal catalyst supported on an inorganic, oxidic carrier to reduce the sulphur dioxide to hydrogen sulphide and the off-gases thus treated are subsequently contacted with an adsorbent or absorbent to remove the hydrogen sulphide produced, the quantity of hydrogen and/or carbon monoxide required for the reduction being already present in the Claus off-gas by the addition of hydrocarbons and/or carbon dioxide to the Claus process from which the off-gases originate. The catalyst may contain molybdenum, tungsten and/or chromium as Group VI metal and/or a metal from the iron group as Group VIII metal. Suitable inorganic oxidic carriers include alumina and the Group VI and/or Group VIII metal catalyst may be used in sulphided form. After or simultaneously with the reduction, the off-gases may be contacted at a temperature of between 200‹ and 350‹ C. with a solid catalyst for the conversion of carbonyl sulphide and/or carbon disulphide into hydrogen sulphide. Suitable catalysts for the conversion of carbonyl sulphide and/or carbon disulphide into hydrogen sulphide include alumina, bauxite, activated clays, aluminium phosphate, thoria and magnesium chloride. The absorbent for the H 2 S produced may be solid (e.g. active carbon), or liquid such as an amine, heterocyclic base or alkanolamine. Additional oxidants or catalysts as listed in the Specification may be incorporated in the absorbent.</p> |
