摘要:
La présente invention concerne un tube flexible armé comportant au moins un élément de renfort allongé. Selon l'invention, cet élément allongé a une section droite, ou profil, présentant une forme de T, et est enroulé hélicoïdalement.
摘要:
La présente invention concerne une conduite flexible armée comportant un ou plusieurs des composants suivants, une armure de résistance à la pression (3), une armure de résistance à la traction (5) et/ou une carcasse interne (1). Cette conduite se caractérise en ce qu'au moins l'un desdits composants comporte un ou plusieurs éléments allongés tel un profilé, un câble, un fil ou un feuillard, ledit élément étant composé d'un matériau composite à matrice en alliage d'aluminium comportant des éléments de renfort tels des particules et/ou des whiskers.
摘要:
The invention concerns a selective hydrogenation catalyst, which catalyst comprises particles of a porous support consisting of at least one refractory inorganic oxide and, as active elements, palladium distributed at the periphery of the particles and at least one element selected between tin and lead. The invention also concerns a method for the selective hydrogenation of a mono-olefinic or di-olefinic hydrocarbon fraction using this catalyst.
摘要:
The invention concerns a NU-86 zeolite, containing silicon, and at least one element T selected from the group formed by aluminium, iron, gallium and boron, preferably aluminium, characterised in that the element T has been extracted from the structure and in that it has a global atomic Si/T greater than about 20. The extraction of the element T from the zeolite structure (or network) is effected by at least a thermal treatment. optionally carried out in the presence of water vapour, followed by at least an acid attack, by at least a mineral or organic acid solution, or by a direct acid attack. The invention also concerns a catalyst comprising said zeolite at least partly in acid form and the use of said catalyst in hydrocarbon conversion, in particular in the oligomerization of olefins.
摘要:
This steam cracking method comprises injecting at at least one point upstream of a secondary indirect quenching exchanger (4b), particles of average size from 0.02 to 4 mm, at a circulating speed of 20 to 180 m/s in this exchanger, in sufficient amounts to limit the increase of the outlet temperature of the effluents to less than 100 °C per month. At least 70 wt. % of the amount of injected particles is introduced downstream of the primary quenching exchangers (4a) and upstream of the secondary exchanger tubes. At regular intervals, a decoking of the pyrolysis tubes and the primary quenching exchangers is effected in the presence of air.
摘要:
A method for producing para-xylene from a xylene-containing feedstock, wherein a first fraction is enriched to at least 30 wt.% with para-xylene, and said fraction is purified by means of at least one high-temperature crystallisation step performed in at least one crystallisation zone. Specifically, said first fraction enriched to at least 30 wt.% with para-xylene is crystallised in a crystallisation zone (50) at a high temperature (T1), advantageously between +10 and -25 °C, a suspension of crystals in a mother liquor is recovered, the crystals are separated from the mother liquor in at least a first separation zone (52), the resulting crystals are partially melted in at least one partial melting zone (55), a crystal suspension is recovered, the crystal suspension is separated and washed in at least one separation and washing zone (57), and pure para-xylene crystals and a washing liquor (58) are recovered, whereafter said pure crystals are optionally completely melted (61) and a liquid stream (60) of molten para-xylene is recovered. The mother liquor may be crystallised in a second crystallisation zone at a high temperature (T2) lower than the first (T1), and the second crystals may be partially melted, separated and washed as above.
摘要:
L'invention concerne un procédé de production en fed batch d'une composition de sophorosides, dans lequel on met en culture au moins une souche Candida bombicola ou Candida apicola et l'on soumet ladite souche cultivée dans une zone de réaction à une alimentation excédentaire en sucre et à une alimentation en continu en au moins un substrat approprié à un débit d'alimentation dans la zone réactionnelle comprise entre 0,01 et 4 grammes par heure et par litre de volume réactionnel initial et pendant une durée d'alimentation tels que la concentration résiduelle en ledit substrat dans la zone réactionnelle soit maintenue à une valeur au plus égale à 18 grammes par litre de volume réactionnel initial pendant ladite durée d'alimention; et on récupère la composition de sophorosides produits.
摘要:
A steam cracking method and plant using controlled injection of solid particles into a quenching exchanger (3). The particles are injected through 1 to 8 injection lines, slightly upstream from an impinger/diffuser (6) with solid surfaces facing the line for transferring cracked gases to the exchanger. Said impinger/diffuser is located in the inlet cone (2) of the exchanger, it is gas-permeable in that it has a plurality of passages, and it is at least 70 % opaque when seen from the transfer line.
摘要:
To provide long-term regular monitoring of an underground area, a stationary seismic transceiver device is positioned at the production site so that stable operating conditions are maintained at all times, i.e. constant transmission/reception locations, constant earth coupling quality, etc. The device comprises a plurality of seismic sources (S1 ... Sn) placed in fixed locations on the surface or buried at a shallow depth, on either side of a production shaft (1), and one or more receiver assemblies (R) permanently mounted on the surface or in one or more wells. Explosive sources, positive-pressure hydraulic sources, electro-mechanical sources, etc., may be connected to a power supply facility (3). They use an explosive gas mixture optionally comprising a component drawn from the area being monitored, and a pressurised fluid transmitting hydraulic shocks or vibrations, etc., via buried ducts or cables (2), and the power supply to and operation of the sources are controlled by a central control and recording station (4). The device is useful for monitoring the filling of an underground cavity, e.g. for gas storage.
摘要:
A device for monitoring the ageing of coolant fluids in heat exchanging circuits. The device includes a member (4) contacting the liquid to be monitored, an electrical member (51) separated from the liquid-contacting element (4) by an insulating space (6) containing a fluid at a given pressure, said electrical element responding to the degree of corrosion of the liquid-contacting element, and an alarm (8) responding to a change in the signal from the electrical element. Said liquid-contacting element consists of at least one plate (41) made of a material which is present elsewhere in the circuit and contacts said fluid (3) therein, and said electrical element consists of an element made of a piezoelectric material with a frequency that varies depending on changes in the pressure in the insulating space (6).