US738328A - Process of defecating saccharine juices. - Google Patents

Description

No. 738,328.-v

.l `ls'AulzNTLD sEPT.8,19os. I J.v J. HIGNBTTB. lRooBss of DBPEGATING SACCHARINE JUICBS.

APPL IGATION FILED APR. 27. 1898.

N0 MODEL.

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ha? libri-ggg? UNITED STATES Patented September 8, 1903.

`PATENT OFFICE.

JEAN JULES HIGNETTF., OF PARIS, FRANCE.

SPECIFICATION forming part of Letters Patent No. 738,328, dated September 8, 1903. Application filed April 27, 1898. SerialNo. 678,997. (No specimens.)

dent of Paris, France, have invented certain new and useful Improvements in the Process of Defecating Saccharine Juices, of which the f following is a specification.

This invention 'relates to an improved process for treating and purifying sugar-jnice.

The juice is first lightly limed or barytaed, then decanted, in order to free it from the mud or sediment. lt is then introduced continuously into a centrifugal having a basket with imperforate walls and also provided with a diaphragm, which centrifugal receives simultaneously the carbonation and bleaching gases, (carbonio acid, sulfurous acid, and the like.) In consequence of the reactions produced in this apparatus and owing to the action of centrifugal force the mass under treatment is separatedinto two partsone the clarified juice, which escapes with the gas by a pipe having a small orice, and the other the semiiluid mud or sediment, which is constantly discharged by another pipe.v

This mud mixed with the first mud from the decantation is brought into a second centrifugal having a basket with imperforate Walls, but no diaphragm, and in which itis treated byasimilar process in order to remove therefrom the last remains of sugar-juice which it contains.

Theapparatus intended for carrying out this process is shown in the accompanying drawing.

In the drawing, A represents a tank divided into two liXiviating-compartments and provided with agitators A and B, driven through bevel-gears ct' and b' from a shaft b b2, provided witha belt-pulley b3. The material to be treated is fed to the compartments from a hopper A2 by an endless conveyer A3.

C is a decantation-reservoir connected by pipes c and c with liXiViators; F F', centrifugals having baskets T T' with imperforate walls. The centrifugal F comprises internally a diaphragm D. l

H L S are pipes for the circulation of the juice.

P and Q4 are pumps.

K is a pipe for introducing the gas which passes through a washin g device G.

`N R O are pipes for conveying the mud.

E is a mixing apparatus, and M a limingtank.

The juice to be treated is first of all conveyed into the liXiviators A B, in which it is mixed with a small proportion of lime, (or baryta). This limed juice is conveyed into tank C, from the bottom of which the precipitated mud is removedV by a helicoidal conveyer C. The part of the juice decanted off flows, on the other hand, by pipes IgI, provided with float-valves I, into a number of centrifugals F. This number varies according to the size of the factory. The centrifugals F employedin this system are centrifugals having a closed casing and a basket T, with im- "perforate walls, revolving at a high speed.

Under the action of centrifugal force and the lime in solution in the juice there is deposited on' the walls of the drum T in each centrifugal a muddy layer of slight consistency, which contains a large proportion of the organic substances contained in the diffusionjuice of the beet-root.

If to the action of the lime there be simultaneously added in the centrifugals that of a current of carbonio-acid gas introduced by a pipe K, coming from a lime-kiln and passing through a washing device G, the following phenomenze are producedz' Vhile the lime saturates the free acids and continues to cause deposits by the decomposition of the albumenoid substances, the carbonic acid in contact with the solution of limed juice produces carbonate of lime, which is particularly favorable to the rapid and complete precipitation of azotic substances. The carbonio acid producing the carbonate of lime is employed in the proportion which is strictly necessary in order to maintain an average alkalinity favorable to the absolute and permanent decoloration of the juice. Under the action of the centrifugal force and by'means thereof the carbonate of lime is precipitated on the walls of the baskets, together with about thirty per cent. of the organic substances contained in the juice. This partially-carbonated mud is black and is charged with organic substances relatively poor in sugar, because the sucrate formed is decomposed gradually by the carbonio acid.

lf it is desired to immediately at the same IOO time bleach the juice, gaseous sulfurous acid is introduced into the centrifugals, and in this case the latter must be provided with hermetical covers or lids. The juice discharged at L, emulsioned by the gas, is already yery fluid and almost entirely free from color.` Its purification is completed by a second cold liming in order to precipitate all the lime in the condition of carbonate and saturate the excess of carbonic acid. Finally it is sent by a pump Q and pipe S into a vat M, where it is heated to about 80 centigrade'in A order to complete' the eliminationof the gas and finish the precipitations, then filtered, and then sent to the boiling-'down apparatus.

The precipitate formed under the action of centrifugal force in the centrifugal F does not accumulate in the latter. It is removed as produced, so that there is no need to stop the centrifugal at certain moments in order to empty it. This continuity of operation produces a considerable economy of time and labor.' This result is obtained by the combined use of the bent pipe N and horizontal diaphragm D in thc form of a ring, the external circumference of which is at a certain distance from the cylinder. This diaphragm being placed at an intermediate level between the points Where the pipes L and N open,it will be seen that the pipe L, placed above the diaphragm, gives passage to sugar-j uice,which is lighter than the liquid mud that is stopped by the interposed diaphragm and which passes through the pipe N. The mud thus eliminated, as Well as that arising from the deposit of the decantation in the vat C of the limed juice, is forced, respectively by pipes N and R, into a mixer E. There the mud is diluted with weak sugar juice or drainings, to which some thousandths of lime are added, and the whole is conveyed by means of the pump P and pipes O into a centrifugal F', having a basket T', with imperforate walls, but without This treatment of the mud by the same principles as the treatment of the sugar-juice by the use of acids-and bases and the system of decantation by centrifugal force allows of the loss of sugar being considerably reduced, while simplifying the labor required. v My method of treatment and the decoloration of the juice without bone-black and without the multiple carbonatations at present employed is thus completed, with considerable economy in labor, lime, and carbonic acid.

I declare that what I claim isl. The herein-described process of simultaneously carbonating and clarifying sugarjuice which consists in continuously introducing limed juice into a centrifugal and simultaneouslyintroducing carbonic-acid gas intol the centrifugal, substantially as described.

2. The herein-described process of simultaneously carbonating and clarifying sugarl juice which consists in continuously introducing limed juice into a centrifugal, simultaneously indroducing carbonic-acid gas into the centrifugal and carrying the separated mud to a second centrifugal for further treatment with carbonic-acid gas, su bstantially as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

JEAN JULES HIGNETTE.

Witnesses:

JOSEPH DELAGE, EDWARD P. MACLEAN.

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