US1066557A - Apparatus for concentrating sulfuric acid. - Google Patents

Description

P. VIALLBIX & P. PERRIN.

APPARATUS Pon GUNGENTBATING sULPURIo ACID.

APPLIOATIGN FILED MAY 6, 1911.

1,066,557.Y Patented July 8, 1913.

IE'IERRE VIALLEIX AND FIEIRNANI')V PERRIN, OF VOLVIC, FRANCE.

APPARATUS Foa coNcaNrnArrNe sommare Acro.

Specification of Letters Patent.

Application mamy e, 1911. serial No. Gamas.

To all whom it may concern,

Be it known that we, PIERRE ViALLEIx and FERNAND PERRIN, citizens of the French Republic, residing at Volvic, Puy-de-Dome, France, have invented certain new and useful Improvements in Apparatus for Concentrating Sulfuric Acid, of which the following is a specification.-

This invention relates to improvements in apparat-us for concentrating sulfuric acid of the t-ype in which the concentration is effected by hotI gases which are drawn over and through theI liquid while the lat-ter is descending a series of trays or troughs the lowest of which contains a quantity cf concentrated acid and is provided with baflie plates so thatI the entering gases are drawn through the liquid.

This apparatus is known as the Kessler type.

The improvements forming the subject of this patent comprise: modifications made in the construction of the lowest trough of the Kessler apparatus, the use ofl a new generator for this apparat-us which does away with the use of porcelain,`the combination of the said generator with the improved lower trough forming a new apparatus which is stronger, cheaper and more economical than the existing apparatus. 1

The modifications made in the construction of the lower trough consist in obviating the use of puniice stone for the inner packing, and in the reduction of the blast and other iues formed by the battles. These blast flues, to t-he number of three in the old apparatus, have been reduced here to one central flue, and the other'flues to the number of four, have been consequently reduced to two. The excessive number of blast and other flues necessitated a very complicated construction which weakened the apparatus, as they were constituted by very thin pumice stone partitions, the lower parts of which deteriorated very easily either owingjto cleaning or to the working of the apparatus itself This improvement makes possible the use of refractory materials other than pumiee stone and of a sufficient thickness for insuring perfect strength, thus avoiding the trouble and expense caused bythe frequent repairs of the old apparatus. Lava or sandstone for example, could be used.

The drawing accompanying this description shows the improved apparatus.

Figure l is an elevation in longitudinal `the regenerator plates.

As shown in Figs. l-B of the drawing` only the two longitudinal batlles I) and b with a central gas inlet at c, have been retained. The hot gases coming from the gas generator, are drawn in by means of a fan or blower of any construction, into the ccntral flue d and discharged vafterward into the twoflues c c. It follows from this arrangement that the working of the apparatus is greatly simplified, while offering the greatest guarantee of strength. The cleaning of the apparatus is also easier, the number of flues being reduced to a minimum. 0n coming out from the lower trough the hot gases are drawn into a regenerator of novel form. ln this regenerator, the use of porcelain parts such as supports, caps and retrogradation cups, has been do-ne away with, while the surfaces of contact between the hot gases and the acid to be concentrated have been increased, which is an essential condition for evaporation and for insuringr high eil'iciency; In order to obtain that rcsult, the device used comprises several superposed plates recessed so as to form each a cup intended to receive the acid to be concentrated. Each plate is moreover arranged in such a manner that its bottom portion acts in the same way as the porcelain caps of the plates in the old apparatus. The retrogrz'ldation of the acid from cup to cup. takes place through the gas inlet opening f. rThis admission of the gases into each cup takes place through a single orifice f (Figs. 1 and 4t) situated at the side and alternating. Projections g and g are provided in the bottom portion of each plate situated above and at the same time forming a cover. These projections g and g', while increasing the strength of the plates, touch the liquid in the plate below, thus forming the necessary contact surfaces, and replace the porcelain caps hitherto used for the purpose. The 10a resulting economy can be easily seen. On the one hand, the plates no longer having any cut-out portions required for the passage of the porcelain supports, the number Patented July 8, 1913.

of which varied from 18 to 36 for each of 110 them, thus offering guarantees of strength, cheapness and unusual durability compared tothose of the old system, the numerous porcelain parts of which were frequently broken by the action of sudden changes of temperature, thus rendering lthe use of the generator very precario-us and necessitating frequent repairs.

Owing vto the use of this new recuperator without special parts or joints of any kind, the durability of the apparatus will be not only greater, but there will be also a considerable Saving of fuel, as the regenerator, always being in perfect condition, the concentration of acid in the same will be more active and will thus have a higher concentration, -so that the acid will enter the lower trough at 65 B., which will greatly facilitate the work of the latter for obtaining acids at 96 to 97% of HZSO4 required Vmore and more industrially.

Inspection and cleaning holes L are provided for each plate. l

That we claim as our invention and desire to secure by Letters Patent is :f-

1. Apparatus for concentrating sulfuric acid comprising a trough adapted to conacid comprising a casing, a series4 of superposed plates within said casing and arranged to permit hot gases to be drawn therebetween, weirs on said plates adapted to retain acid thereon, projections on the lower side of each of said plates extending below the surface of the acid on the next lower plate, a lower trough adapted to contain acid two baflles projecting into said acid and a cover upon said battles, for the purpose set forth.

3. Apparatus for concentrating sulfuric acid, comprising a trough adapted to contain concentrated acid, two longitudinally disposed batlies formed of refractory material and a cover for said battles arranged to cause gases drawn between said baffles toV pass below the surface of said acid, in combination with a casing, a series of super-l posed plates wlthln said casing, weirs ony the upper sides of said plates adapted to retain acid thereon through which hot gases may be drawn through openings between said platesand projections onthe lower side of each of said plates extending below the surface of the acid on the next lower plate substantially as set forth. v In testimony whereof we have signed our names to this specication in the presence of two subscribing witnesses.

PIERRE VIALLEIX. FER-NAND PERRIN. Witnesses:

GEORGES TANGER, J Louis DAINDUR.

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