DE735006C - Device for continuous or discontinuous saturation of juices, in particular sugar juices, by means of gases - Google Patents

Description

Device for continuous or discontinuous saturation of juices, especially sugar juices, nüttels gases in the sugar industry it is is known to be extremely important, the juice obtained from beet or sugar cane to get rid of the non-sugar substances as completely as possible, uni pure and bright Obtain sugar solutions. The well-known saturation method is used for this purpose to which quick lime is added to the sugar juices to be treated, which in the saturation vessels by means of carbonic acid and, if necessary, by means of sulphurous Acid is precipitated as calcium carbonate or calcium sulfite.

The purpose of the first saturation that carried out aerated is that in the sugar juice a fine-grained sludge of calcium carbonate is formed with a large surface reaction. When this sludge is formed a large part of the non-sugar and coloring matter carried away during the filtration remain in the mud. When saturating sugar juices, there is a great danger that already precipitated calcium carbonate is converted, whereby the absorbed Non-sugars are partially dissolved again. It is therefore very important that Local oversaturation does not occur in any part of the saturation vessel; so-called dead corners must also be avoided, so that parts of the areas to be treated are not Sugar juices remain undersaturated. There is a particular risk of these disadvantages with the old types of saturation vessels.

It is known to saturate juices, especially sugar juices, these juices, interspersed with gases, rise automatically in a saturation room to leave and then in a more or less gas-poor state in below a room parallel to the saturation room in a sloping direction the effect of one's own gravity, i.e. also automatically, to be traced back.

The invention relates to devices of this type and seeks to improve their construction and effect. Namely, while previously the Saturationsraum quite has the same width, whereby a premature elimination of gas from the liquid and thereby liquid-gas mixture enters a continuously premature interruption of the Saturationsprozesses on ascending, the Erfindun is g according to the Saturationsraum in- which the automatic movement toward rising juices steadily rejuvenated. As a result, the cross section of the juice flow in the saturation roughness is steadily reduced and as a result, a premature excretion of the gas from the liquid is prevented. B. steadily ascending gas-liquid mixture under otherwise equal conditions.

Fig. 1 of the drawings illustrates in a schematic representation and in a vertical axial section an embodiment of a saturation vessel set up according to the invention; Figs. 2 and 3 show sections along the line AA and BB of Fig. i .

In the embodiment shown in the drawing, a tube 2 is installed in the cylindrical saturation vessel i, coaxial with it, open at the top and bottom, which is connected at its lower end to the cross-sectioned saturation space 4 and itself forms a so-called downpipe . The sugar juice to be treated is introduced into the saturation space 4 through a pipe 6 that can be shut off by means of a valve 8 , a control straw 13 serving to maintain the correct filling level. Perforated distribution pipes 3 are arranged below the liquid inlet, into which the carbonic acid enters from a rin '-' shaped distribution chamber ii. A pipe 14, which can be shut off by means of a valve 9, is used to supply the gas. F-tap 7 , which enables samples to be taken, is used to control the alkalinity during saturation and the valve io provided at the lowest point of the container i is used to drain the sugar juice to be treated. The downpipe 2 tapers downwards (Fig. I), whereby the saturation space 4 is tapered upwards. In the saturation space 4, inclined deflection surfaces 5 provided with correspondingly fine holes are arranged, which run in the manner of parts of a screw or worm surface that are offset from one another. Such deflection surfaces are known in other systems in saturation systems, but they serve a different purpose there.

The path of the liquid to be treated is indicated in Fig. I by arrows. The gas-liquid mixture in the saturation space 4 is specifically lighter than the liquid in the downpipe: 2, which has been largely freed from the gas again. As a result, the gas-liquid mixture in the saturation space 4, the cross-section of which is steadily decreasing, slowly rises upwards, being set in slow circular motion around the pipe 2 by the perforated deflection surfaces 5. Due to the steady reduction in the cross-section of the juice flow in the saturation space, on the one hand, a separation of gas and liquid due to premature escape of gas is prevented and, on the other hand, the formation of the finest gas bubbles, evenly distributed in the liquid, is promoted or the formation of larger gas bubbles and thus counteracting the formation of foam. This results in a uniform saturation of the sugar juice while shortening the overall reaction time. On the upper surface of the saturation space.4 gas and sugar juice separate; the latter enters over the edge of the downpipe 2, while the gas and the vapor emerge through the pipe 12. The liquid freed from the gas sinks under the effect of its greater heaviness, i.e. automatically, in the downpipe: 2 downwards and is thereby returned to the underside of the saturation space -i.

The device described can be used for the continuous or discontinuous treatment of sugar juices. The subdivision of the saturation vessel i into a rising and falling space 4 and 2 and the design of the deflecting surfaces 5 can be modified in many ways. The embodiment shown in the drawing has the advantage that it can easily be built into the previously customary saturation vessels.

Claims (2)

PATENT CLAIMS: i. Device for the continuous or discontinuous saturation of juices, especially sugar juices, in which the juices to be treated, permeated with gases, rise automatically in a saturation room and then in a more or less degassed state in a room parallel to the saturation room in a sloping direction also automatically under the Effect of gravity can be traced back again, characterized in that the saturation space is steadily tapered in the direction of movement of the automatically rising juices. 2. Device according to claim i, with ringförrnigem saturation space and within of the saturation room is a return room for those to be treated Juices, characterized in that in the upwardly tapering saturation space in a manner known per se arranged offset from one another, advantageously fine Perforated screw segments o. The like. Are built in, which is a slowly circling Movement cause the juices to rise in the saturation space.