USRE10004E - Guido schnitzer - Google Patents

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G. SGHNITZBR, 'Assignor, by mesne assignments, to THE ROYAL BAKING POWDER C0.

MANUFACTURE-0F CREAM 0F TARTAR.

No. 10,004. Reissued Jan. 3,1882.

INVENTOR: I Z4, 1% BY M ATTORNEYS.

WITNESSES:

UNITED STATES PATENT OFFICE.

GUIDO sonsrr'znn, or sonwaersou HALL, WURTEMBERG, GERMANY, ASSIGNOR, BY MESNE ASSIGNMENTS, ro THE ROYAL BAKING POWDER COMPANY, OF N EYV YORK, N. Y.

MANUFACTURE OF CREAM' OF TA RTAR.

SPECIFICATION forming-part of Reissued Letters latent No. 10,004, dated January 3, 1882.

' Original No. 183,597, dflted October 21, 1876. Application for reissue filed December 1, 1880.

To all whom it may concern:

Be it known that I, Gurno ScHNrrznn, of Schwabisch Hall, in the Kingdom of Wiirtemberg, Germany, have invented a new and useful Process in the Manufacture of Bit-artrate of Potash, popularly known as Cream of Tartar and I do hereby declare that the following is afull,-clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification.

In manufacturing cream of tartar argols are used. These argols, as is well known, consistessentially 'of'bitartrate of potash, tartrate of lime, and various organic and mineral substances in varying proportions.-

In the ordinary methods of manufacturing cream of tartar heretofore used the argols were placed in boiling water, the bitartrate of potash of the argols was dissolved in said water, the tartrate of lime of the argols was largely dissolved in the solution .of bitartrate of potash, and the organic and mineral substances remained substantially undissolved except the coloring-matters contained in them, The solution of bitartrate of potash and tartrate of lime was then allowed to crystallize; but the resulting crystals, instead of containing only pure bitartrate of potash, contained also considerable quantities of tartrate of lime. A certain amount of tartrate of lime was left undissolved. A certain amount of tartrate of lime was therefore contained in the product and a certain amount left in the residuum. In carrying on the old method above mentioned the argols were dissolved in the water in an open vessel by the action of heat. Insteadof these open vessels, I employ a closed vessel, the contents of which are kept under pressure while the dissolving of the argols proceeds, and by using hydrochloric acid and chloride of potassium in the solution I convert thetartrate of lime into bitartrate of potash, thereby transforming the tartrate of lime, which would otherwise remainin the solution of argols as an impurity, and also increasing very much the product of cream of tartar.

Figure 1 represents a vertical section of the copper or copper-lined cylinder used in the proby six and a half (6%) feet in height.

cess with steam and exhaust pipes. Fig. 2 rep-- I use in my process a copper or copper-lined cylinder, preferably placed and maintained in ,an upright position. (Seen in Fig.1.) This'cylinder may beof any size butI prefer thjatit should be about four-and a half (4%) feet in diameter At the top of this cylinder is a man-hole of suflicient size to allow easyingre'ss and egress. The manhole plate must be so fastened as to be able to sustain the requisite pressure to be maintained in the boilerand to be steam-tight. Asteampipe, B, Fig. 1, leading from, a steam-boiler, passes into the cylinder. From the bottom of the cylinder or boiler another pipe, 0, Fig. 1, extends for the purpose of removing any insoluble or foreign matter that may settle after the crystallization of the cream of tartar'has taken place. A

The advantages and merits of my process over any and all others now known or used are that by my process a much larger percentage or proportion of the argols can be and are dissolved; the crystals obtained are larger and finer; the product of the bitartrate of pota'ssa is greater and mixed with very few impurities,

.thus supplying a very pure bitartrate of potassa at alower cost.

Having described the apparatus and some of the advantages of my process, I will now proceed to describe my process and the manner in which I prefer to work it more fully.

The amount of argols to be treated in a given cylinder will depend upon the size of the cylinder; but I prefer to use about a thousand pounds of argols in a cylinder of thesize above given.

I first place in the cylinder A-au amount of water suificient (under the treatment of steam) to dissolve the aigols to be used, which will be sufficient water to about half fill the cylinder. I then add to the water in the cylinder the argols, and also the requisite equivalents of hydrochloric acid, (1101,) of requisite gravity and chloride of potassium (K01) the amount of argols, as before stated, being regulated by the size of thecylinder. The cylinder is then closed and-steam under pressure is ad mitted through pipe B, Fig. 1, and so maintained for about three (3) hours, more or less. extended to near the bottom of the cylinder, as shown in'Fig. 1, will cause the entrance of the steam to agitate the contents of the cylinder. The steam-supply being turned oft", the cylinder and contents are allowed to remain till the crystallization of the bitartrate of potassa is complete, which usually takes about three (3) days. The crystals of bitartrate of potassa deposited in the cylinder are removed through the man-hole shown in Fig; 2. The motherwaterlZ. is drawn off, by means of a siphon or otherwise, into another vessel at B, Fig. 1. 7 If this mother-water is not sutficient to dissolve the new charge of argols, the necessary amount of water is to be added. Thus all undissolved tartrate of lime and uncrystallized bitartra-te of potassaare saved and utilized. The insoluble and foreign matter deposited at the bottom of the-cylinder A may be removed by means of pipe 0, Fig. 1, or otherwise. I

By adding the necessary amount of animal charcoaland pipeclay all coloring-matter will be removed from the bitartrate of potassa,making'the product verypure.

Itwill be noticed that this process dilfe'rs essentially from those hitherto employed, in that I do not eflect the solution of the argols by ordinaryboiling nor by heating by means of asteam-jacket.

By either of these methods a much longer time was required to efl'ect the soiution'of the argols and the chemical changes,

Having thus described my invention,what I The pipe B, being claim, and desire to secure by Letters Patent, 18-

1. The improvement in the art of treating argols to obtain a solution of the same, which consists in subjecting the argols while being dissolved to the pressure of steam, substantially as described.

2. The improvement in the art of treating argols to obtain a solution of the-same, which consists in subjecting the argols while being dissolved tothe pressure of steam admitted near the bottom of the vessel containing the argols, substantially as described.

' 3. The improvement in the art of obtaining cream of tartar from argo1s,which consists substantially of dissolvingthe argolsin water under steam-pressure, converting the tartrate of lime 'into bitartrate of potash by the aid of hydrochloric-acid and chloride of potassium, and separating the cream of tartar after it has crystallizedfrom the residual solution, substantially as described.

4. The process herein described of ma nufacturing cream of tartar by subjecting ground argols, together with hydrochloric acid and chloride of potassium, in a steam-tight vessel, to the direct action of compressed steam for the necessary length of time, and then allowing the solution to stand till the crystallization of the bitartrate of potassa is complete, substantially in the manner specified.

' GUIDO SCHN-ITZER, Witnesses:

Professor Dr. A. WINFFERLIN,

Bibliothekm'. Prof. Dr. G. FAEGER.

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