Patent GB-243946-A (GB)
Title: Improved method of treating substances centrifugally and machines therefor
IPC: B04B11/06
Filed: 1925-02-24
Abstract: 243,946. White, A. E., (Sharples Specialty Co.). Feb. 24, 1925. Density separators.- Substances are treated' or separated in a centrifugal machine which is supplied with a carrier fluid; the points of entry and discharge are varied by the use of various weirs and the liquid balance of the bowl contents is maintained during operation. In the form shown in Fig. 1 the rotor 1 is suspended and revolved by means of its top neck 2, and the substances to be treated, for example chilled oil and wax, are admitted through the opening 3<1> in the lower boss 3. A ring dam 4 provided with external and internal weirs 4<1>, 5<1> is arranged at the top of the rotor. A compartment 6 is formed between the ring 4 and the end of the rotor, and is connected by a passage 7 to the annular channel 8 provided with a weir 9<1> held in place by the nut 19. The carrier liquid' is supplied through the pipe 17 and passes through the annular chamber 14 close to the axis, then it moves outwards through the passape 15 to enter the rotor chamber near its periphery. The point of entry of the carrier liquid is therefore farther from the axis than the exit passages 7, 12 of the separated or treated substances. Where the apparatus is used for the separation of oil and wax, the mixture enters the bottom of the rotor and after separation the oil flows over the weir 5<1>, through the passage 12 into the chamber 13; the wax and the carrier liquid pass out through the passage 7 over the weir 9<1> to the chamber 10. Different weirs may be substituted for those shown to vary the degree of separation. The construction enables the carrier liquid to be introduced without interference with the separation or with the discharge of the constituents. The carrier liquid may be selected to produce some desired effect upon the heavier constituent; it may, for instance be a solvent, or it may be at a temperature to harden or soften the constituent. In a modification all the substances including the carrier are admitted at the bottom of the rotor. The lighter constitutent only is discharged at the top; the heavier constituent and the carrier are discharged at the bottom thus permitting the heavier constituent to be in the rotor for a short time only. In another modification as shown in Fig. 3, ring dams 4<1>, 4<b> are provided at the top and bottom respectively of the rotor. The substance for treatment is introduced through the bottom of the rotor and the lighter constituent passes over the weir 5<1> and through the passage 12 at the top. The heavier constituent passes over the weir 9<1> or the weir 9<b>, its passage depending on the relative sizes of the weirs, and it may be arranged to discharge at the same or opposite end of the bowl as it enters. The carrier liquid may be introduced at the top or bottom through pipes 17 or 16a and it may be discharged from the same or opposite end as the heavier constituent. The carrier may be introduced at both ends, or carriers for obtaining different results may be introduced, for example, cold brine may enter at the top and hot brine or a solvent at the bottom.