Abstract: The invention relates to an improved process and apparatus for degassing liquid sulfur. According to the invention liquid sulfur is contacted with a catalyst module with voidage of 60% or more, which results in catalytic decomposition of H2Sx to produce sulfur and H2S, and stripping/removing the balance of the H2S from the sulfur by means of the stripping gas. The invention furthermore relates to an apparatus comprising a catalyst module having an open volume of at least 60% and means for contacting liquid sulfur with a stripping gas to carry out said process.

Abstract: The invention relates to an improved process and apparatus for degassing liquid sulfur. According to the invention liquid sulfur is contacted with a catalyst module with voidage of 60% or more, which results in catalytic decomposition of H2Sx to produce sulfur and H2S, and stripping/re-moving the balance of the H2S from the sulfur by means of the stripping gas. The invention furthermore relates to an apparatus comprising a catalyst module having an open volume of at least 60% and means for contacting liquid sulfur with a stripping gas to carry out said process.

Abstract: The invention provides a catalyst, a method for making the catalyst and a method for using the catalyst to promote the selective oxidation of hydrogen sulfide into elemental sulfur. The catalyst may be prepared by contacting a catalyst support, such as silica, with a mixed oxide having atomically mixed iron ions and zinc ions, to produce a support material impregnated with a mixed oxide having atomically mixed iron ions and zinc ions in an oxidic lattice. This impregnated catalyst support is then dried and calcined, preferably with chloride ions present, to produce a catalyst of an iron and zinc oxide mixture supported on silica. It has been found that when chloride is added to the impregnated catalyst support prior to calcination and drying, the sintering of the iron and zinc can be controlled more easily and the formation of iron and zinc oxide is promoted.

Abstract: The invention is directed to a process for the catalytic reduction of sulphur dioxide from a gas mixture at least containing 10 vol. % of water, in which process the gas mixture is passed over a sulphur resistant hydrogenation catalyst in sulphidic form, at a space velocity of at least 2000 h−1, in the presence of a reducing component, preferably at least partly consisting of hydrogen, in a molar ratio or reducing component to sulphur dioxide of more than 10 up to 100, at a temperature of 125° C. to 300° C., followed by passing the gas mixture, after the said reduction, through a dry oxidation bed for the oxidation of sulphur compounds, more in particular hydrogen sulphide, to elemental sulphur.

Abstract: The invention is directed to a process for the recovery of sulphur from a hydrogen sulphide containing gas, which process comprises; i) oxidizing part of the hydrogen sulphide in a gaseous stream with oxygen or an oxygen containing gas in an oxidation stage to sulphur dioxide; ii) reacting the product gas of this oxidation stage in at least two catalytic stages, in accordance with the Claus equation: 2 H2S+SO2→2 H2O+3/n Sn; iii) catalytically reducing SO2 in the gas leaving the last of said at least two catalytic stages, wherein the catalytic reduction takes place in a catalyst bed downstream from the last Claus catalytic stage.