Abstract: A cylindrical wall for filtering solid particles in a fluid is disclosed herein, through which a fluid is likely to circulate. This wall includes at least one perforated plate having a finite radius of curvature, and at least one grating element superposed on this perforated plate. The grating element includes a plurality of rigid wires extending in a longitudinal direction and positioned adjacent to one another in order to filter the solid particles, characterized in that the grating element is arranged for the wires to be secured to one another only by means of links between adjacent wires, each link between two adjacent wires occupying only a portion of the length of the wires, and having a thickness less than or equal to the thickness of these wires in proximity to this link.

Abstract: A cylindrical wall (12) for filtering solid particles in a fluid, through which a fluid is likely to circulate, this wall comprising at least one perforated plate (23) having a finite radius of curvature, and at least one grating element (22) superposed on this perforated plate, this grating element comprising a plurality of rigid wires (26, 26A, 26B, 26C, 26D) extending in a longitudinal direction and positioned adjacent to one another in order to filter the solid particles, characterized in that the grating element is arranged for the wires to be secured to one another only by means of links (27) between adjacent wires, each link between two adjacent wires occupying only a portion of the length of said wires, and having a thickness less than or equal to the thickness of these wires in proximity to this link.

Abstract: A cylindrical wall (100) for filtering solid particles in a fluid, through which this fluid is likely to circulate, this wall comprising: a perforated cylinder (30) being produced from at least one perforated plate, a grating assembly (110), of generally cylindrical form, intended to be in contact with the solid particles, the grating assembly and the perforated cylinder being concentric, the grating assembly comprising at least one grating element (113), said grating element comprising a plurality of wires (111), means for assembling said at least one grating element so as to form the grating assembly of generally cylindrical form, said assembly means being arranged to ensure a fixing of said at least one grating element on the perforated plate that can be dismantled.

Abstract: A device (1) for indicating loosening of a rotary element (2) of a screw-and-nut system, this rotary element being intended to be screwed by a movement in rotation about a longitudinal direction (D), said rotary element comprising a portion of polygonal section in a plane normal to the longitudinal direction, said polygonal section portion defining a plurality of plane faces (21, 22, 23, 24, 25, 26), said indicator device comprising a body (3) intended to be mounted on the rotary element, a marking element (4) extending radially, fastened to the body to indicate the angular position of the rotary element, and at least one spring (31, 32, 33, 34, 35, 36) fastened to the body so that when the body is mounted on the polygonal section portion each spring exerts a radial bearing force on a corresponding plane face of the rotary element.

Abstract: A cylindrical wall (100) for filtering solid particles in a fluid, through which this fluid is likely to circulate, this wall comprising: a perforated cylinder (30) being produced from at least one perforated plate, a grating assembly (110), of generally cylindrical form, intended to be in contact with the solid particles, the grating assembly and the perforated cylinder being concentric, the grating assembly comprising at least one grating element (113), said grating element comprising a plurality of wires (111), means for assembling said at least one grating element so as to form the grating assembly of generally cylindrical form, said assembly means being arranged to ensure a fixing of said at least one grating element on the perforated plate that can be dismantled.

Abstract: A distributor tray for a gas and a liquid circulating as a co-current, said tray comprising a plate perforated by orifices and supporting hollow chimneys extending perpendicularly to said plate, each orifice of the plate being surmounted by a chimney of identical cross section to said orifice, characterized in that the plate is equipped with a plurality of openings arranged on the periphery of each chimney inside a circumscribed circle, the center of which coincides with the center of the chimney, and the radius of which is less than or equal to ? of the shortest distance separating two adjacent chimneys, and in that a single deflector element is arranged beneath each chimney, the openings and the deflector element associated with each of the chimneys being so arranged as to impart a rotating movement to the gas/liquid mixture under each chimney.

Abstract: A distributor tray (1) for a gas and a liquid circulating as a co-current, said tray comprising a plate (10) perforated by orifices (12) and supporting hollow chimneys (20) extending perpendicularly to said plate (10), each orifice (12) of the plate being surmounted by a chimney (20) of identical cross section to said orifice (12), characterized in that the plate (10) is equipped with a plurality of openings (30) arranged on the periphery of each chimney (20) inside a circumscribed circle, the centre of which coincides with the centre of the chimney (20), and the radius of which is less than or equal to 1/3 of the shortest distance separating two adjacent chimneys (20), and in that a single deflector element (40, 100) is arranged beneath each chimney (20), the openings (30) and the deflector element (40,100) associated with each of the chimneys (20) being so arranged as to impart a rotating movement to the gas/liquid mixture under each chimney.

Abstract: The invention concerns an inner tray, arranged inside a chamber, comprising a plurality of parallel beams (1), located in a common horizontal plane and fixed through their ends to the wall of the chamber, and, between said beams and supported thereby, rows of adjacent rectangular plates (2), completely covering the space between the beams. The invention is characterized in that the supporting edges (3) of the plates (2) through which the latter are supported on the beams (1), are folded downwards by two substantially right-angled folds, and in that each of the edges (4) of the plates (2), perpendicular to the beams (1) is folded so as to form a female part (4a) or a male part (4b) capable of being respectively nested in a male (4b) or female (4a) part formed by the folded edge of the adjacent plate. The invention also concerns a chamber containing such a tray.

Abstract: The invention concerns an inner tray, arranged inside a chamber, comprising a plurality of parallel beams (1), located in a common horizontal plane and fixed through their ends to the wall of the chamber, and, between said beams and supported thereby, rows of adjacent rectangular plates (2), completely covering the space between the beams. The invention is characterized in that the supporting edges (3) of the plates (2) through which the latter are supported on the beams (1), are folded downwards by two substantially right-angled folds, and in that each of the edges (4) of the plates (2), perpendicular to the beams (1) is folded so as to form a female part (4a) or a male part (4b) capable of being respectively nested in a male (4b) or female (4a) part formed by the folded edge of the adjacent plate. The invention also concerns a chamber containing such a tray.

Abstract: The invention concerns a device wherein the diffusion chamber (6) comprises, between its upstream end and its downstream end, in the direction of the fluid flow, at least an insert (12) formed by an annular ring having an external diameter identical to the internal diameter of the chamber, said annular ring being arranged perpendicular to the axis of the supply conduit and projecting towards the inside part of the chamber from the side wall(s) thereof, to form a lateral obstacle to the fluid flow, the solid surface of the insert (12) being sufficient to generate in the upstream part of the chamber a pressure higher than that of the downstream part.

Abstract: A method for the isomerization of a hydrocarbonic charge containing a substantial quantity of paraffin base hydrocarbons with 5 or 6 carbon atoms and a benzene content that is greater than or equal to 2% by weight, in which the charge to be treated passes, in the presence of hydrogen, at a total pressure greater than or equal to 10.105 Pa (10 bars) and at an average temperature ranging between 100 and 200° C., through at least one reactor (5) containing a catalyst. An adjunctive fluid is introduced in the upstream section of the reaction zone; a fluid that at 40° C. and under atmospheric pressure (1.0134.105 Pa), is in a gaseous phase and has a density that is less than or equal to that of the normal-pentane taken into account under the same conditions.

Abstract: The invention concerns a device wherein the diffusion chamber (6) comprises, between its upstream end and its downstream end, in the direction of the fluid flow, at least an insert (12) formed by an annular ring having an external diameter identical to the internal diameter of the chamber, said annular ring being arranged perpendicular to the axis of the supply conduit and projecting towards the inside part of the chamber from the side wall(s) thereof, to form a lateral obstacle to the fluid flow, the solid surface of the insert (12) being sufficient to generate in the upstream part of the chamber a pressure higher than that of the downstream part.

Abstract: This invention relates to a method for drying the charge of a unit that treats petroleum cuts with a low water charge that consists in injecting a hydrolysable chemical compound into said charge. The quantity of the chemical compound injected is at least equal to the quantity necessary for all the water contained in the charge to react by hydrolysis with said chemical compound. The invention finds its application in units that treat petroleum cuts and whose operation is sensitive to the presence of water in their charges, in particular the paraffin base hydrocarbon isomerisation units. One drawing.

Abstract: A procedure for the alkylation of isobutane by olefinic hydrocarbons, in which a first hydrocarbon charge (3) rich in isobutane is put in contact with a second hydrocarbon charge rich in light olefins (2), under conditions that will provoke the alkylation of the isobutane by the light olefins, the effluents that emanate from the reaction area in a fractionation column (6) are treated in order to extract therefrom at least a first cut rich in alkylate (7), a second cut rich in normal butane (8) and a third cut rich in isobutane (9), said third cut (9) is then recycled at the entry of the alkylation reaction area. The second cut (8) rich in normal butane is purified (12) so as to lower its content in compounds with 5 or more carbon atoms to a value that is less than or equal to 5% by weight, the cut thus purified (14) is treated in an isomerization reactor (16) of normal butane to isobutane, this cut is then recycled (21) at the entry of the alkylation effluents fractionation column (6).

Abstract: This invention relates to a method for drying the charge of a unit that treats petroleum cuts with a low water charge that consists in injecting a hydrolysable chemical compound into said charge.

Abstract: A method for the isomerization of a hydrocarbonic charge containing a substantial quantity of paraffin base hydrocarbons with 5 or 6 carbon atoms and a benzene content that is greater than or equal to 2% by weight, in which the charge to be treated passes, in the presence of hydrogen, at a total pressure greater than or equal to 10.105 Pa (10 bars) and at an average temperature ranging between 100 and 200° C., through at least one reactor (5) containing a catalyst. An adjunctive fluid is introduced in the upstream section of the reaction zone; a fluid that at 40° C. and under atmospheric pressure (1.0134.105 Pa), is in a gaseous phase and has a density that is less than or equal to that of the normal-pentane taken into account under the same conditions.

Abstract: The invention relates to an acid catalyst containing a substantial quantity of supported or mass sulfated zirconia and at least one hydrogenating transition metal. This catalyst is characterized by the fact that the sulfated zirconia is in crystallized form and that it shows a specific surface area greater than or equal to 135 m2/g, a pore volume greater than or equal to 0.16 cm3/g and an average pore diameter greater than or equal to 20 Angstroms (20×10−10 m). The invention also relates to methods of making this catalyst and to the uses of this catalyst in hydrocarbon transformation chemical reactions requiring the use of an acid type catalyst, such as for example, isomerization, alkylation, oligomerization reactions or even light hydrocarbon dehydration reactions, and also heavier hydrocarbon hydrocracking and hydroisomerization reactions. In a preferred embodiment of the method of the present invention, a hydrated zirconia gel is washed with a soluble polar organic solvent (other than water).

Abstract: A method for the isomerization of a hydrocarbonic charge containing a substantial quantity of paraffin base hydrocarbons with 5 or 6 carbon atoms and a benzene content that is greater than or equal to 2% by weight, in which the charge to be treated passes, in the presence of hydrogen, at a total pressure greater than or equal to 10.105 Pa (10 bars) and at an average temperature ranging between 100 and 200° C., through at least one reactor (5) containing a catalyst. An adjunctive fluid is introduced in the upstream section of the reaction zone; a fluid that at 40° C. and under atmospheric pressure (1.0134.105 Pa), is in a gaseous phase and has a density that is less than or equal to that of the normal-pentane taken into account under the same conditions.

Abstract: The object of the invention is a procedure for the alkylation of isobutane by olefinic hydrocarbons, in which a first hydrocarbon charge (3) rich in isobutane is put in contact with a second hydrocarbon charge rich in light olefins (2), under conditions that will provoke the alkylation of the isobutane by the light olefins, the effluents that emanate from the reaction area in a fractionation column (6) are treated in order to extract therefrom at least a first cut rich in alkylate (7), a second cut rich in normal butane (8) and a third cut rich in isobutane (9), said third cut (9) is then recycled at the entry of the alkylation reaction area.

Abstract: An alkylation catalyst including a least one porous refractory metal oxide with at least one halogen on the surface thereof. The catalyst contains 0.005-1 wt % of at least one metal from groups IA and IIA of the periodic table of the elements and is particularly useful in an isobutane alkylation method using light olefins.