Abstract: A single-stage low temperature catalytic process for desulphurisation of a gas which contains a mixture of H.sub.2 S and SO.sub.2 which process includes feeding the gas to be treated at a temperature below the dew point of sulphur to a Claus converter having a Claus catalyst in a reaction stage in which the catalyst includes a composite catalytic mass of alumina and one or more compounds of titanium, yttrium, lanthanum or the rare-earth elements of atomic number 58 to 71, and contacting the gas with the Claus catalyst at a temperature below the dew point of sulphur, by which sulphur deposits on the Claus catalyst and the gas is desulphurised.

Abstract: A process is provided for improving the sulphur yield of a sulphur production unit using an acid gas containing H.sub.2 S and wherein said unit is comprised of a sulphur plant with a downstream purification unit. The H.sub.2 S resulting from hydrolysis of COS and CS.sub.2 is almost entirely recovered in the form of sulphur in the purification unit resulting in an improved sulphur output of the overall installation.

Abstract: The invention is a catalytic process for removing H.sub.2 S and hydrogen polysulfides from liquid sulfur. The process comprises mixing a heterocyclic compound with the liquid sulfur and removing the hydrogen sulfide from the liquid sulfur by contact with a gas which is inert to the liquid sulfur at the treating temperature.

Abstract: The invention is a catalytic process for removing H.sub.2 S and hydrogen polysulfides from liquid sulfur. The process comprises mixing a heterocyclic compound with the liquid sulfur and removing the hydrogen sulfide from the liquid sulfur by contact with a gas which is inert to the liquid sulfur at the treating temperature.

Abstract: A catalytic process for the production of sulphur from an acid gas containing H.sub.2 S, in which a part of H.sub.2 S is catalytically oxidized in order to form an effluent containing H.sub.2 S and SO.sub.2 in a molar ratio of 2:1 and a given quantity of sulphur, then said effluent is contacted with a CLAUS catalyst to form a further quantity of sulphur.The catalytic oxidation of H.sub.2 S is carried out in the presence of an oxidation catalyst consisting of agglomerates comprising an active alumina thermally stabilized by at least one oxide from the group consisting of SiO.sub.2, ZrO.sub.2, the rare-earth metal oxides and the alakline-earth metal oxides to which are associated one or more compounds of metals such as iron that promote the oxidation of H.sub.2 S.

Abstract: A regenerative process is provided for removing mercaptans contained in a gas by means of an absorbing agent based on at least one metal oxide capable of chemically fixing the mercaptans. The process comprises an absorption step to fix the mercaptans on the absorbing agent and a regeneration step for regenerating the absorbing agent laden with sulphur-containing products resulting from said fixation. The regeneration is carried out by sweeping the absorbing agent with a hot inert gas to bring the absorbing agent to a temperature between 250.degree. and 500.degree. C. and desorb the sulfur-containing products, and by contacting the absorbing agent thus treated with a gas containing free oxygen to reoxidize the absorbing agent and by cooling the reoxidized absorbing agent by sweeping with a cold inert gas.

Abstract: A process is provided for eliminating COS and CS.sub.2 compounds contained in an industrial gas. The gas containing an appropriate quantity of water vapor is contacted with a titanium oxide catalyst arranged in a high temperature reaction zone. The reaction is carried out while maintaining at specific values the ratio R between the number of water vapor moles and the number of moles of the compound(s) COS and CS.sub.2 in the supplied gas in contact with the catalyst, as well as the temperature at the outlet from the reaction zone. The process is applicable to the treatment of industrial gases usable in organic synthesis and containing COS and CS.sub.2 as impurities susceptible of perturbating synthesis reactions.

Abstract: A catalytic process for the production of sulphur from an acid gas containing H.sub.2 S, in which a part of H.sub.2 S is catalytically oxidized in order to form an effluent containing H.sub.2 S and SO.sub.2 in a molar ratio of 2:1 and a given quantity of sulphur, then said effluent is contacted with a CLAUS catalyst to form a further quantity of sulphur.The catalytic oxidation of H.sub.2 S is carried out in the presence of an oxidation catalyst consisting of agglomerates comprising an active alumina thermally stabilized by at least one oxide from the group consisting of SiO.sub.2, ZrO.sub.2, the rare-earth metal oxides and the alkaline-earth metal oxides to which are associated one or more compounds of metals such as iron that promote the oxidation of H.sub.2 S.

Abstract: Catalytic desulfurization process of an acid gas containing H.sub.2 S, and optionally a total quantity of at most 3% by volume of CS.sub.2 and/or COS, by contacting said acid gas and oxygen or air with a catalyst based on titanium oxide, at temperatures between 100.degree. C. and 600.degree. C. The catalyst used comprises, in addition to the titanium oxide, a sulfate of alkaline earth metal selected from Ca, Sr, Ba and Mg. Application to the desulfurization of acid gases, which in particular contain less than 15% by volume of H.sub.2 S, and therefore cannot be treated in conventional sulfur plants.

Abstract: Catalytic process for the production of sulphur from an acid gas containing H.sub.2 S, in which a part of H.sub.2 S is catalytically oxidized in order to form an effluent containing H.sub.2 S and SO.sub.2 in a molar ratio of 2:1 and a given quantity of sulphur. The effluent is then contacted with a CLAUS catalyst to form a further quantity of sulphur.Said process involves:an oxidation reactor with a fixed bedan indirect gas/gas heat exchangerdeoxygenation reactor having a fixed beda catalyst conversion batterya thermal incinerator.

Abstract: Improved process for the production of sulphur from a gas containing H.sub.2 S, SO.sub.2, H.sub.2 and/or CO, in which the gas is caused to pass through a CLAUS catalyst in a primary catalytic stage operating at between 200.degree. and 460.degree. C. in order to form sulphur, and thereafter the sulphur contained in the reaction mixture issuing from this stage is condensed through indirect heat exchange with water to produce steam.The improved process consists in constituting at least the final eighth of the catalyst volume in this stage by a composite mass formed from a refractory oxide on which is fixed a transition metal compound, for example Co and/or Mo, and in entering into contact the gas with this composite mass at between 300.degree. and 460.degree. C. in order to oxidize H.sub.2 and CO.The energy resulting from this oxidation is recovered in the form of a supplementary quantity of steam during the sulphur condensation.

Abstract: A process for the catalytic incineration of residual gases containing a low content of H.sub.2 S and/or SO.sub.2, organic compounds of sulfur such as COS, CS.sub.2, mercaptans and possibly vapor and/or vesicular sulfur, comprising a hydrogenation stage which transforms all the sulfur compounds into H.sub.2 S followed by a catalytic oxidation stage to transform H.sub.2 S into SO.sub.2.The catalyst used in the oxidation stage consists in a porous support, having a surface area of at least 5 m.sup.2 /g and containing, by weight, 50 to 100% of a product selected from the group comprising titanium or zirconium oxides, silica and zeolites, and 50 to 0% alumina, to which is associated one or several compounds of metals belonging to the group formed by Cu, Ag, Zn, Cd, Y, Lanthanides, V, Cr, Mo, W, Mn, Fe, Co, Rh, Ir, Ni, Pd, Pt, Sn and Bi. The use of such an oxidation catalyst leads to a practically quantitative yield of conversion of H.sub.2 S into SO.sub.

Abstract: In a process for desulphurizing gases containing SO.sub.2 and SO.sub.3 by absorption of the sulphur containing compounds by means of absorbents based on alumina free of alkaline substances, activated alumina or alumina carrying salts or oxides of at least one element selected from the groups IB, IIB, IVB, VB, VIB, VIIB, VIII of the Periodic Classification, the absorption takes place at temperatures comprised between 100.degree. and 400.degree. C., and the absorbent loaded with said compounds in the form of sulphates is heated with a gas containing a reducing gas, especially H.sub.2 S, to a temperature of 250.degree. C. to 450.degree. C., while the elementary sulphur thus formed is separated from said absorbent, whereafter the latter is re-used in a subsequent absorption operation.

Abstract: The Claus process for the production of sulphur is improved by employing a deoxidation catalyst prior to the conventional Claus oxide catalyst.

Abstract: Novel hydrophilic modified acrylic polymers, which are, in particular, hydrosoluble or hydrodispersible. These novel polymers contain, expressed in molar percentages, p % of units derived from an acrylic acid or ester, q % of units derived from an alkanolamine of said acid, r % of units derived from the alkali metal, alkaline earth metal or ammonium salt of the said acid, and s % of units derived from a vinylic monomer, p, q, r and s representing integers and being so selected that 1.ltoreq.p.ltoreq.99, O.ltoreq.q.ltoreq.96, O.ltoreq.r.ltoreq.99 and O.ltoreq.s.ltoreq.40, and the sum (p+q+r+s) is equal to 100.

Abstract: Novel hydrophilic modified acrylic polymers, particularly hydrodispersible or hydrosoluble modified acrylic polymers, containing, expressed in molar percentages, p % units derived from an acrylic acid or ester, q % units derived from an alkanolamide of said acid, r % units derived from the alkanolammonium salt of said acid, and s % units derived from a vinyl monomer, wherein p, q, r, s represent integers so selected that 1.ltoreq.p.ltoreq.95, O.ltoreq.q.ltoreq.99, O.ltoreq.r.ltoreq.99 and O.ltoreq.s.ltoreq.40, the sum (p+q+r+s) being equal to 100, and q and r never being nil simultaneously.