Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur
Patent
1987-06-25
1990-12-25
Russel, Jeffrey E.
Chemistry of inorganic compounds
Sulfur or compound thereof
Elemental sulfur
C01B 1704
Patent
active
049801465
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a process for removing sulphur compounds contained in a residual gas and especially those contained in a residual gas issued from a CLAUS sulphur plant, with recovery of the said compounds in the form of sulphur.
The residual gases issued from a sulphur plant in which the sulphur is produced by the process wherein an acid gas containing H.sub.2 S is submitted to a partial oxidation known under the name of CLAUS process, contain about 0.2 to 2% in volume of sulphur compounds of which a high proportion consists of H.sub.2 S, the remainder being constituted by SO.sub.2, CS.sub.2, COS and vapor and/or vesicular sulphur.
Such residual gases are currently treated to lower as much as possible the overall sulphur compounds content with the purpose of allowing them to be rejected into the atmosphere, after having been incinerated, while respecting the standards imposed by the legislation with respect to atmospheric pollution and simultaneously recovering these sulphur compounds in a form favorable to increasing the content in valorizable products obtained from acid gas treated in a sulphur plant.
One known process developed by the present applicant to carry out the treatment of a residual gas from a CLAUS sulphur plant consists in bringing the residual gas, after possible cooling to a temperature lower than 160.degree. C., into contact with a CLAUS catalyst to form sulphur by reaction of H.sub.2 S with SO.sub.2, the said catalyst operating at a temperature sufficiently low for the sulphur produced to be retained on the catalyst, and periodically in sweeping the sulphur-laden CLAUS catalyst by means of a non-oxidizing gas having a temperature comprised between 200.degree. C. and 500.degree. C. to vaporize the sulphur retained on the catalyst and thus ensure the regeneration of this latter, then cooling the regenerated catalyst to the temperature required for a fresh contacting with the residual gas, this cooling being carried out by means of an inert gas at a temperature below 160.degree. C., said gas being laden with water vapor at least during the final phase of its utilization.
In order to satisfy the increasingly strict legal standards imposed with respect to atmospheric pollution by sulphur compounds, the applicant has brought to the above-mentioned process the improvement that is the object of the invention and which, on the one hand, ensures good recovery of the organic sulphur compounds present in the residual gas and not recovered by the above-mentioned process and, on the other hand, leads to an improvement of the sulphur yield of the reaction of H.sub.2 S with SO.sub.2 in contact with the CLAUS catalyst, which increases the overall recovery rate of the sulphur compounds contained in the residual gas and at the same time further lowers the overall concentration of sulphur products vented into the atmosphere.
The aim of the invention is thus an improved process for removing sulphur compounds contained in a residual gas and especially in a residual gas issued from a CLAUS sulphur plant with recovery of the said compounds in the form of sulphur, the said process being of the type in which a gaseous stream issued from the residual gas containing H.sub.2 S and SO.sub.2 and having a temperature lower than 160.degree. C. is brought, into contact with a CLAUS catalyst to form sulphur by reaction of H.sub.2 S with SO.sub.2, the said catalyst operating at a sufficiently low temperature for the sulphur produced to be retained on the catalyst, and a purified residual gas having a very low sulphur content is evacuated and periodically the sulphur-laden CLAUS catalyst is swept by means of a non-oxidizing gas having a temperature comprised between 200.degree. C. and 500.degree. C. to vaporize the sulphur retained on the catalyst and thus ensure the regeneration of this catalyst then the regenerated catalyst is cooled to the temperature required for a fresh contacting with the gas containing H.sub.2 S and SO.sub.2, this cooling being carried out by means of an inert gas having a temperature lower th
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Kvasnikoff Georges
Nougayrede Jean
Philippe Andre
Russel Jeffrey E.
Societe Nationale Elf Aquitaine (Production)
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