Abstract: To protect the end of a cable composed of a set of tendons individually held in an anchorage system, the device comprises a skirt extending from the front of the anchorage system and placed around the set of tendons, and several sleeves. The tendons have respective end portions which extend beyond the front of the anchorage system and which are individually received in the sleeves, said sleeves being sealed off beyond the end portions of the tendons. A connection between the skirt and the sleeves encloses a chamber delimited by the front of the anchorage system, the skirt, and the sleeves, the connection comprising an active stuffing box kind of system. The volume of this chamber is filled in with a filling product.

Abstract: To protect the end of a cable composed of a set of tendons individually held in an anchorage system, the device comprises a skirt extending from the front of the anchorage system and placed around the set of tendons, and several sleeves. The tendons have respective end portions which extend beyond the front of the anchorage system and which are individually received in the sleeves, said sleeves being sealed off beyond the end portions of the tendons. A connection between the skirt and the sleeves encloses a chamber delimited by the front of the anchorage system, the skirt, and the sleeves, the connection comprising an active stuffing box kind of system. The volume of this chamber is filled in with a filling product.

Abstract: A catalytic composition for selective reduction of nitrogen oxides comprising, as active material, mordenite in ammonium or acid form, with a residual sodium content less than 1000 ppmw, representing 70 to 95% of the total weight of the catalytic composition, the remainder comprising a binder. The active material can also be in the form of small-pore mordenite exchanged with copper ions.The catalytic composition can be used for the purification of effluents with containing any nitrogen oxide, in particular for depolluting residual gases rejected into the atmosphere during the production of nitric acid.

Abstract: Gaseous effluents polluted by nitrogen oxides are purified by catalytic reduction. The catalytic compositions used contain iron and chromium associated with alumina and optionally at least a promoter selected from rare earth oxides with a content between 0.1 and 1% in relation to the active material and crude platinum metals with a content between 1 and 5 ppm in relation to the active material, the specific surface of the compositions being between 50 and 300 m.sup.2 /g and the dimensions of the pores between 40 and 50,000 A. These compositions are applicable for processes of purification of nitrogen oxides with any content.

Abstract: A catalyst for implementing a process for manufacturing amines from alcoh is composed of an active element in the transition metals family uniformly combined with a refractory porous structure with a specific surface of between 10 and 300 m.sup.2 /g and with a pore diameter less than 5000 A. A stabilizer in the form of a sodium-based compound with a sodium content of 0.15 to 20% by weight relative to the weight of the catalyst, and a promoter in the form of a rhodium-based compound with a maximum rhodium content of 0.1% by weight relative to the weight of the catalyst, may be associated with the active metal. The catalyst and the process are applicable to the ethanolamine-ammonia reaction with a view to producing ethylenediamine, piperazine, and useful byproducts.

Abstract: The invention relates to the purification of gaseous effluents containing ides of nitrogen by reduction of said oxides in the presence of a catalyst at raised temperatures.The catalysts used in this process contain iron as a major constituent, and may contain chromium or vanadium: these constitute 96 to 99.5% of the weight of the catalyst. Also present as promoters, in a total amount of 4.0 to 0.5% by weight of the catalyst, are one or more rare earth metal oxides and a trace quantity of a platinum metal. The catalyst is prepared by a method which ensures a specific surface of 20-100 m.sup.2 /g and pores having a maximum dimension between 100 and 5000 A.Such a catalyst is particularly suitable for removing residual oxides of nitrogen from the gaseous effluent obtained in the production of nitric acid by the oxidation of ammonia.