摘要:
An apparatus and process is provided for improved asphaltene separation from heavy hydrocarbon or bitumen with low process complexity through mass transfer using solvent and counter-current flows, with three sections: an upper DAO/solid-asphaltene separation zone, a middle solvent mixing and segregation zone, and a bottom clarification zone. Solvent mixed with heavy hydrocarbon forms a process feed introduced to the process vessel's upper zone and exposed to counter-current solvent removing DAO from solid asphaltene particles in the feed, the particles fall through the middle zone and are mixed with introduced solvent, which introduced solvent segregates DAO-rich solution in the upper zone (for extraction from that zone) from solvent-rich mixtures in the middle mixing and lower clarification zones. Solvent flows and precipitate movement are controlled to optimize mass transfer in process, resulting in high DAO recovery and dry, solid asphaltene product.
摘要:
In an installation for manufacturing mastic asphalt, bitumen from a hopper (10) is kept warm so that it remains sufficiently fluid to enable it to be easily handled and is supplied to a primary mixer (16). Powdered limestone filler from a hopper (14) is heated by means of heaters (18) and is added, together with unheated grit from a hopper (12), to the mixer (16), via a weighing hopper (20). The constituent materials are mixed without further heat input and are then discharged into a secondary mixer (24) where further mixing occurs. The mixer (24) incorporates passages for the circulation of a heat exchange medium which contacts the asphalt to cool it to a temperature suitable for moulding. The heat extracted from the asphalt is returned to the heaters (18) and re-used for heating the filler for asphalt produced subsequently. Asphalt is discharged from the secondary mixer (24) into a plurality of moulds (52) through a pneumatically-actuated gate (34) (see Fig. 3). The gate (34) is operated by a control system incorporating a micro- processor. Each mould (52) is weighed after filling and a signal indicative of the weight of the mould is fed to the micro- processor. The time for which the gate (34) is opened is varied by the microprocessor in response to the measured weight of the mould so as to render the weight of the asphalt blocks produced as consistent as possible. Consequently, the blocks produced are of substantially uniform size and can be formed, after unmoulding, into a self-supporting stack. The filled moulds (52) are conveyed through a cooling tower (50) in which they pass through an array of spray nozzles arranged to spray water onto the moulds (52) so that at least some of the water impinging on the moulds (52) initially forms steam and thereby cools the asphalt. Inside the cooling tower (50) the moulds (52) are conveyed along a vertical zig-zag path so as to fit.
摘要:
A container for containment of bituminous products formed by inner (10) and outer (11) flexible casings in intimate contact. The inner casing (10) is of a material which has a softening temperature which is above that of the bituminous product (B) when loaded into the container but below that of the bituminous product (B) when it is applied in use, usually by spraying. This inner casing (10) is of a material which has a viscosity at the application temperature which enables the material when melted with the bituminous product to be applied therewith. The outer casing (11) is made from a material which has strength characteristics which enable it to contain the inner casing (10) and bituminous product (B) during the filling of the container as well as during transportation and storage thereof. The outer casing (11) is impervious to movement therethrough of the contained bituminous product, components or additives thereof and preferably has a softening temperature such that melting does not occur at the application temperature.
摘要:
Bei dem Verfahren zur Herstellung von Rohlingen für Fahrbahnmarkierungsmaterial und Bitumen werden die Bestandteile des Materials in einem Kocher (20) aufgeschmolzen und vermischt, das flüssige Material wird in eine mit einem Trennmittel beschichtete Form (26) gegeben wird und das erstarrte Material zum Einsatzort transportiert, dort erwärmt und auf eine Fahrbahn aufgetragen. Es sind mehrere vielfach verwendbare, mit einem Trennmittel beschichtete Formen (26) vorgesehen. Das Material nach Erstarren aus den Formen (26) entfernt und mit einer Polyäthylenfolie umhüllt.
摘要:
The invention relates to a production line for bitumen cakes. The production line or system comprises sequential processing stations, i.e. a station (1) whereat hot bitumen is cast into basins or pans (7), a station (2) whereat the bitumen is air cooled, a station (3) whereat the solidified bitumen cakes (26) are shaken out, a station (4) whereat the cakes (26) are packaged in a heat-shrinkable plastic material, and an optional palletization station (5). The production line is set up to accommodate a plurality of pans (7) which are carried in groups on a plurality of platforms or supporting frames (8) adapted to be cyclically passed through the casting, station, cooling station where they are piled, and shake-out station. The cake shake-out station (3) includes an extraction apparatus equipped with a pusher intended for acting on the outside of the pan bottoms to produce resilient deformation of such bottoms, and hence separation of the pan (7) from the bitumen cake contained therein.