Abstract:
On décrit un procédé d'élimination du soufre d'une charge contenant de l'hydrogène sulfuré, de l'anhydride sulfureux, de l'oxysulfure de carbone et/ou du sulfure de carbone et une quantité minime de benzène, de toluène et/ou de xylènes dans au moins une zone réactionnelle contenant un catalyseur, et on récupère du soufre élémentaire et un effluent au moins en partie débarassé du soufre, le procédé étant caractérisé en ce qu'on utilise comme catalyseur au moins le catalyseur contenant un support comprenant au moins un composé choisi dans le groupe formé par l'alumine, l'oxyde de titane et la zircone, le support comprenant en outre au moins un élément dopant choisi dans le groupe formé par le fer, le cobalt, le nickel, le cuivre et le vanadium. Application au procédé Claus.
Abstract:
A process for removing contaminants, including hydrogen sulphide, from a gas stream, comprising the steps of subjecting the gas stream to a Claus Process; subjecting the tail gas obtained in said Claus Process to a SCOT process; recycling the hydrogen sulphide-enriched gas obtained in said SCOT process to the gas stream for the Claus Porcess; subjecting a sulphur-containing residual hydrocarbon product to oxidation to obtain a gas stream which comprises sulphur dioxide; cooling and quenching said gas stream which comprises sulphur dioxide; absorbing said sulphur dioxide with an absorption solvent to obtain a sulphur dioxide-enriched absorption solvent which is regenerated and the sulphur dioxide - enriched gas stream produced therein is used as sulphur dioxide source for Claus Process.
Abstract:
The present invention relates to a catalyst useful for removal of hydrogen sulphide from gas streams and its conversion to sulphur, a process for preparing such catalyst and a method for removing of hydrogen sulphide using said catalyst.
Abstract:
A method for desulphurising a gaseous mixture which contains a low overall concentration of H2S and SO2 in a mol ratio of H2S:SO2 of about 2:1, and recovering said compounds in the form of sulphur, wherein said gaseous mixture is contracted with a catalyst which is a promoter of the sulphur-forming CLAUS reaction between H2S and SO2 and comprises at least one end portion consisting of a composite catalytic mass obtained by combining alumina with at least one compound of a metal selected from titanium, yttrium, lanthanum and rare earth metals having an atomic number between 58 and 71. The gaseous mixture to be desulphurised is brought into contact with the catalyst at a temperature which is lower than the dew point of the sulphur thereby produced, preferably at between 120 °C and 170 °C, so that the sulphur is deposited on the catalyst.
Abstract:
The proposed catalyst for obtaining sulphur by the Claus process consists of calcium compounds present in quantities of 1.0-35 wt.% and a solid solution of titanium oxide and one or more oxides of metals selected from the group comprising niobium, tantalium and the rare-earth metals (up to 100 wt.%). The proposed method of manufacturing the catalyst for use in obtaining sulphur by the Claus process involves treating titanium tetrachloride with an aqueous solution or suspension of calcium hydroxide and carrying out the proposed process under conditions conducive to the production of a catalyst of the desired composition.
Abstract:
A gas to be desulphurized is contacted with a catalyst containing a catalytic phase associated with a silicon carbide carrier in order to conduct a sulphur-forming reaction between H2S and SO2, and, optionally, a reaction that hydrolyses the COS and CS2 compounds into H2S, at temperatures which, in accordance with the selected implementation method, may be higher or lower than the dew point of the sulphur formed in the reaction gases. The invention is useful for recovering as sulphur H2S and SO2 compounds contained in gases from various sources, such as Claus process gases, and for hydrolysing to H2S the COS and CS2 compounds that the gases may contain.
Abstract:
Processes for the thermal reduction of sulfur dioxide to elemental sulfur are described and disclosed. The processes described include three general reaction sections, including the reaction furnace portion where the SO2-containing stream is combusted, the hydrogenation portion wherein the effluent from the reaction furnace is hydrogenated over an appropriate catalyst, and a Claus conversion portion, wherein residual H2S and SO2 are further reacted to produce additional elemental sulfur.
Abstract:
Processes for the thermal reduction of sulfur dioxide to elemental sulfur are described and disclosed. The processes described include three general reaction sections, including the reaction furnace portion where the SO 2 -containing stream is combusted, the hydrogenation portion wherein the effluent from the reaction furnace is hydrogenated over an appropriate catalyst, and a Claus conversion portion, wherein residual H 2 S and SO 2 are further reacted to produce additional elemental sulfur.
Abstract translation:描述和公开了将二氧化硫热还原成元素硫的方法。 所描述的方法包括三个通用反应段,包括其中含SO 2的物流燃烧的反应炉部分,其中来自反应炉的流出物在合适的催化剂上氢化的氢化部分和克劳斯转化部分,其中残余的H 2 S和 SO 2进一步反应以产生另外的元素硫。
Abstract:
The invention describes catalysts and catalytic methods for the selective oxidation of hydrogen sulfide in a gas stream (401) containing one or more oxidizable components other than hydrogen sulfide to generate sulfur dioxide, elemental sulfur or both without substantial oxidation of the one or more oxidizable components other than hydrogen sulfide. The oxidizale components other than hydrogen sulfide may be hydrocarbon, sulfur-containing-hydrocarbon, oxygenated hydrocarbon, aromatic hydrocarbon, aliphatic hydrocarbon, hydrogen, carbon monoxide and mixture thereof. An exemplary catalyst may contain titania, an oxide of molybdenum, an oxide of niobium and an oxide of iron or an oxide of iron or an oxide of copper.