Patent GB-890654-A (GB)
Title: Method and apparatus for continuous extraction, lixiviation and rinsing of an extractible material
IPC: C13B10/10
Filed: 1958-06-11
Abstract: <FORM:0890654/III/1> <FORM:0890654/III/2> <FORM:0890654/III/3> In the continuous extraction, lixiviation and rinsing of an extractible material, such as the obtaining of oil from earth, shale or oil seed, the material is passed through a plurality of fluid-permeable cells connected in series in counterflow to a treatment fluid, the material is sluiced with an uninterrupted counterflow of the treatment fluid as it passes from cell to cell, the relative position of the particles remaining constant within the cross-section of the material and balanced areas of concentration gradient being avoided, and the mass formed from the extractible material is at various intervals compressed for changing its fluid quantity.  Material is treated in a series of cells i, Fig. 1, bounded by an impermeable container wall a and sieves b mounted for rotation on a shaft c.  The material is conveyed upwardly from cell to cell, in countercurrent to a treatment fluid such as water, through apertures e in the rotating sieves b by ploughs f, the run-on surfaces of which terminate in a forwardly projecting point or streamlined bead.  Plough-shaped cross-pieces g rigid with the container wall and carrying rubber scrapers of brushes on their lower edge serve to guide the material axially parallel in its ascent and to clean the sieves. Flow of fluid between the sieves and the inside of the container wall is restricted by the provision of iron bars d (as shown) or guiding grooves for the sieves in the wall.  The ploughs f which may have perforations corresponding to those of the sieves, taper radially towards the shaft c.  In modifications, the sieve walls b carry concentric rings 1, 2, 3, 4 and 5, Fig. 7, or are funnel-shaped, Fig. 8, to counteract any movement of the material towards the periphery during rotation.  In other embodiments, the fluid product obtained by the extraction is recycled, Fig. 3 (not shown), and the extraction is performed in horizontal operation, Figs. 4 and 5 (not shown).ALSO:<PICT:0890654/IV (a)/1> <PICT:0890654/IV (a)/2> <PICT:0890654/IV (a)/3> In the continuous extraction, lixiviation and rinsing of an extractible material, such as the obtaining of cellulose, pulp or resin from wood, the material is passed through a plurality of fluid-permeable cells connected in series in counterflow to a treatment fluid, the material is sluiced with an uninterrupted counterflow of the treatment fluid as it passes from cell to cell, the relative position of the particles remaining constant within the cross-section of the material and balanced areas of concentration gradient being avoided, and the mass formed from the extractible material is at various intervals compressed for changing its fluid quantity.  As shown, material is treated in a series of cells i, Fig. 1, bounded by an impermeable container wall a and sieves b mounted for rotation on a shaft c.  The material is conveyed upwardly from cell to cell, in countercurrent to a treatment fluid such as water, through apertures e in the rotating sieves b by ploughs f, the run-on surfaces of which terminate in a forwardly projecting point or streamlined bead. Plough-shaped cross-pieces g rigid with the container wall and carrying rubber scrapers or brushes on their lower edge serve to guide the material axially parallel in its ascent and to clean the sieves.  Flow of fluid between the sieves and the inside of the container wall is restricted by the provision of iron bars d (as shown) or guiding grooves for the sieves in the wall.  The ploughs f, which may have perforations corresponding to those of the sieves, taper radially towards the shaft c.  In modifications, the sieve walls b carry concentric rings 1-5, Fig. 7, or are funnel-shaped, Fig. 8, to counteract any movement of the material towards the periphery during rotation.  In other embodiments, the fluid product obtained by the extraction is recycled, Fig. 3 (not shown), and the extraction is performed in horizontal operation, Figs. 4 and 5 (not shown).