Abstract: A method of coring a lettuce head, consisting in cutting the lettuce head (TS) transversely with respect to its axis (RR), above the core (TR), leaving a residue (E4) formed by the core and the remains of the leaves, while the residue (E4) is rotated about its axis while a jet of cutting water forming a cutting line (AA) is directed toward the base of the rotating residue (RR) to separate the leaf remains from the core (TR).

Abstract: A process for the selective hydrogenation of diolefinic compounds to mono-olefinic compounds uses a catalyst composition comprising at least one salt of a transition metal from groups IB, IIB, VB, VIB, VIIB and VIII of the periodic table, at least one ligand and at least one organometallic reducing agent, optionally in the presence of a non-aqueous ionic liquid selected from the group formed by liquid salts with general formula Q+A? (in which Q+ represents a quaternary ammonium and/or quaternary phosphonium and A? represents any anion which can form a liquid salt below 90° C.).

Abstract: A process for the selective hydrogenation of diolefinic compounds to mono-olefinic compounds uses a catalyst composition comprising at least one salt of a transition metal from groups IB, IIB, VB, VIB, VIIB and VIII of the periodic table, at least one ligand and at least one organometallic reducing agent, optionally in the presence of a non-aqueous ionic liquid selected from the group formed by liquid salts with general formula Q+A? (in which Q+ represents a quaternary ammonium and/or quaternary phosphonium and A? represents any anion which can form a liquid salt below 90° C.).

Abstract: Installation characterised in that it comprises a central rotating column (1) bearing a set of tilting arms (2) uniformly distributed around its periphery and extending radially out from it, each equipped, at its free end, with a support (5) which pivots about an axis (4) essentially perpendicular to its longitudinal axis and bearing a perforated basket (3) designed to hold a batch of lettuces to be treated, this perforated basket (3) being mounted so as to rotate about its axis (xx?), and a set of treatment stations (I to X) uniformly distributed in a circular arrangement around the central rotating column (1), in alignment with the perforated baskets (3), and each being designed to co-operate with one of these respective baskets (3), which central rotating column (1) is displaced in a step by step movement to enable each of the perforated baskets (3) to be continuously transferred from one treatment station to another.

Abstract: Method of preparing lettuce heads with means for removing the stalk from the head prior to cutting it. A visible, luminous reference line (2) is generated in the zone where the item (P) is placed on a positioning support (41), this line defining the orientation of the item. The item is then positioned on the (41) and anchored and the item (P), thus positioned, is conveyed until it makes contact with a hooking means (ET) so that the item (P) can be automatically picked up with a view to conveying it in readiness for removing the stalk.

Abstract: A process for eliminating mercury and possibly arsenic from a hydrocarbon feed comprises: 1) distilling the hydrocarbon feed to obtain at least one light cut and at least one heavy cut; 2) treating at least one said heavy cut, said treatment comprising two steps a first step bringing said heavy cut into contact with hydrogen and a catalyst; a second step consisting of passing the effluent from the first step over a mass for capturing mercury and possibly arsenic.

Abstract: A process for capturing mercury and possibly arsenic comprising at least: a) vaporising (or flashing, step a1) then condensing a hydrocarbon-containing feed (step a2) without separating said feed; b) treating the effluent from step a2 comprising at least one step for bringing said effluent into contact with hydrogen and a catalyst, and optionally capturing arsenic; c) a step consisting in passing the effluent from step b) over a mercury capture mass.

Abstract: The invention concerns a process for eliminating arsenic from a hydrocarbon cut in which said cut is brought into contact with an absorption mass that is at least partially pre-sulfurized and comprises a support and lead oxide. The support, for example alumina, or said mass preferably has a specific surface area in the range 10 to 300 m2/g, a total pore volume in the range 0.2 to 1.2 cm3/g and a macroporous volume in the range 0.1 to 0.5 cm3/g. The lead content of said mass, expressed as lead oxide, is preferably in the range of 5% to 50% by weight. The fraction of the sulfurized mass preferably represents at least {fraction (1/20)}th of the total volume of the absorption mass.

Abstract: A process for eliminating mercury and possibly arsenic from a hydrocarbon feed comprises:

Abstract: A process for capturing mercury and possibly arsenic comprising at least:

Abstract: A process for capturing mercury and possibly arsenic comprising at least:

Abstract: The invention concerns a process for eliminating arsenic from a hydrocarbon cut in which said cut is brought into contact with an absorption mass that is at least partially pre-sulphurized and comprises a support and lead oxide.